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  • IPEN-DOC 28125

    NUNES, R.P.; BONATTO, A.; MALDONADO, E.P.; SAMAD, R.E. ; VIEIRA JUNIOR, N.D. . Simulation study of laser wakefield acceleration varying the down-ramp length of a gas jet. In: LIN, LIU (Ed.); BYRD, JOHN M. (Ed.); NEUENSCHWANDER, REGIS (Ed.); PICORETI, RENAN (Ed.); SCHAA, VOLKER R.W. (Ed.) INTERNATIONAL PARTICLE ACCELERATOR CONFERENCE, 12th, May 24-28, 2021, Campinas, SP. Proceedings... Geneva, Switzerland: JACoW Publishing, 2021. p. 1717-1720. DOI: 10.18429/JACoW-IPAC2021-TUPAB142

    Abstract: In this work, particle-in-cell simulations were carried out to investigate the role of the down-ramp length of a H2 gas jet in accelerating electrons ionized by the laser pulse. The laser and plasma density were chosen so that the system is operating in the self-modulated regime. Preliminary results show how the down-ramp length can control the injection of electrons in the first bubble induced in the plasma by the laser pulse.

    Palavras-Chave: wakefield accelerators; gases; electron density; lasers; pulses; electric fields

  • IPEN-DOC 28124

    NUNES, R.P.; BONATTO, A.; MALDONADO, E.P.; SAMAD, R.E. ; VIEIRA JUNIOR, N.D. . Laser pulse dynamics in the self-modulated regime. In: LIN, LIU (Ed.); BYRD, JOHN M. (Ed.); NEUENSCHWANDER, REGIS (Ed.); PICORETI, RENAN (Ed.); SCHAA, VOLKER R.W. (Ed.) INTERNATIONAL PARTICLE ACCELERATOR CONFERENCE, 12th, May 24-28, 2021, Campinas, SP. Proceedings... Geneva, Switzerland: JACoW Publishing, 2021. p. 1721-1724. DOI: 10.18429/JACoW-IPAC2021-TUPAB143

    Abstract: In this work, particle-in-cell simulations were carried out to investigate the dynamics of a laser pulse propagating along a H2 gas jet. The laser-driven wakefield and the density of ionized electrons are analyzed during the pulse propagation through the gas jet. The laser and plasma quantities were chosen in order to have the system operating in the self-modulated regime. Results show how the self-modulation fragments the laser pulse, originating higher-amplitude pulses that can induce bubble formation with wave-breaking and particle injection.

    Palavras-Chave: electron density; plasma simulation; wakefield accelerators; lasers; pulses

  • IPEN-DOC 28123

    SZABO, T.V.; NETO, F.A.B.; MORAES, I.C.; OLIVEIRA, H.B. de ; GUILLAUMON, P.V.. FLUKA simulations of 225Ac production using electron accelerators: validation through comparison with published experiments. In: LIN, LIU (Ed.); BYRD, JOHN M. (Ed.); NEUENSCHWANDER, REGIS (Ed.); PICORETI, RENAN (Ed.); SCHAA, VOLKER R.W. (Ed.) INTERNATIONAL PARTICLE ACCELERATOR CONFERENCE, 12th, May 24-28, 2021, Campinas, SP. Proceedings... Geneva, Switzerland: JACoW Publishing, 2021. p. 1226-1228. DOI: 10.18429/JACoW-IPAC2021-MOPAB409

    Abstract: Targeted Alpha Therapy (TAT) is an active area of study worldwide. This technique has shown a potential in nuclear medicine to treat metastatic disease by alpha particles that deposit energy in small regions nearby cancer cells. 225Ac is an important alpha-emitting that can be used for cancer TAT. This radioisotope shows good potential for medical applications, therefore it is important to study ways of increase its production and availability. One possible path for the 225Ac production is to irradiate a radium target (226Ra) on a linear electron accelerator (LINAC). Isotope production studies could be implemented using computational tools. In this work, Monte Carlo simulations with FLUKA code were performed and compared to experimental results. We studied 225Ac production by photonuclear reactions using a 24 MeV electron beam LINAC hitting a tungsten electron-photon converter. Different energies and geometries were also simulated to obtain optimal production conditions. The specific activity values obtained with simulations had a good agreement with published experimental results.

    Palavras-Chave: electron beams; radioisotopes; actinium 225; computer codes; calculation methods; monte carlo method

  • IPEN-DOC 28112

    TABACOW, FABIO B.D. ; ZUFFI, ARMANDO V.F. ; MALDONADO, EDISON P.; SAMAD, RICARDO E. ; VIEIRA JUNIOR, NILSON D. . Theoretical and experimental study of supersonic gas jet targets for laser wakefield acceleration. In: SBFOTON INTERNATIONAL OPTICS AND PHOTONICS CONFERENCE, May 31 - June 2, 2021, Online. Proceedings... Piscataway, NJ, USA: IEEE, 2021. DOI: 10.1109/SBFOTONIOPC50774.2021.9461936

    Abstract: This work reports a theoretical and experimental study of supersonic gas jets to be used as targets in laser wakefield acceleration. A comparison between theoretical and experimental results ismade in order to estimate the results of a de Laval nozzle manufactured in our laboratory, used to produce a N2 gas target. The comparison between the results shows that Computational Fluid Dynamicssimulations are able todescribe the phenomena of the supersonic gas jet.

    Palavras-Chave: interferometry; acceleration; wakefield accelerators; computer calculations; fluid mechanics; nozzles; supersonic flow

  • IPEN-DOC 28111

    CARDOSO, ELBIS S.; SAMAD, RICARDO E. ; MOTTA, CLAUDIO C.. Refractive index change analysis in a high-power Yb-doped double-clad fiber laser. In: SBFOTON INTERNATIONAL OPTICS AND PHOTONICS CONFERENCE, May 31 - June 2, 2021, Online. Proceedings... Piscataway, NJ, USA: IEEE, 2021. DOI: 10.1109/SBFOTONIOPC50774.2021.9461981

    Abstract: An analytical investigation of the refractive index behavior of an ytterbium-doped optical fiber silica glass as a function of the core-clad temperature, upper-level population laser density, and pumping signal intensity is presented in this paper. For the substantiation of the investigation, three fundamental expressions were used, which describe the changes in the refractive index due to these physical phenomena in the laser medium. The model was evaluated considering a 500 W steady state fiber laser, operating in a two-end pumped configuration.

    Palavras-Chave: ytterbium; doped materials; optical fibers; refractive index

  • IPEN-DOC 28110

    PRADO, FELIPE M. ; WETTER, NIKLAUS U. . Record optical efficiency for a diode-side-pumped Nd:YLiF4 laser operating at 1053 nm. In: SBFOTON INTERNATIONAL OPTICS AND PHOTONICS CONFERENCE, May 31 - June 2, 2021, Online. Proceedings... Piscataway, NJ, USA: IEEE, 2021. DOI: 10.1109/SBFOTONIOPC50774.2021.9461863

    Abstract: Here we compare the efficiency and beam parameters of different single-bounce Nd:YLF4 resonators. A total of five cavities were made by changing both, the curved mirror and the output coupler of the resonator. The best configuration resulted in a cavity that generated a record optical-to-optical efficiency of 63.3% and 66.4% of slope efficiency, with a peak output power of 64.5 W for a pumping power of 101.8 W at 797 nm.

    Palavras-Chave: solid state lasers; neodymium lasers; diode-pumped solid state lasers; cavity resonators; vanadates

  • IPEN-DOC 28109

    MAGALHAES, EVELLYN S.; WETTER, NIKLAUS U. ; KASSAB, LUCIANA R.P.; BORDON, CAMILA D. da S.; ROSSI, WAGNER de . New double line architecture produced by fs laser irradiation in Nd3+ doped TeO2-ZnO glass for photonic applications. In: SBFOTON INTERNATIONAL OPTICS AND PHOTONICS CONFERENCE, May 31 - June 2, 2021, Online. Proceedings... Piscataway, NJ, USA: IEEE, 2021. DOI: 10.1109/SBFOTONIOPC50774.2021.9461861

    Abstract: We report the fabrication and passive characterization of Nd 3+ doped TeO 2 -ZnO glass with a new configuration of double waveguides, written with fs laser operating at 800 nm, delivering 30 fs pulses at 10kHz repetition rate. The two written lines that form the double waveguide are formed by several overlapping lines. Results of output mode profile, beam quality factor M 2 and refractive index change are presented as well as the parameters used for laser writing. Writing speed of 0.5 mm/s and pulse energy of 15 μJ demonstrated to be adequate parameters for writing. Refractive index changes of Δn = 1×10 -5 and Δn = 1×10-4 were found at 632 nm for double waveguides written with 4 and 8 overlapping lines, respectively. The mode image results at the output of the waveguides showed a confined beam in agreement with multi transverse order mode. Beam quality factor results were the following: M y = 24±3 and M x = 14±3 at 632 nm. The glasses are produced with the melt quenching technique and the preliminary results demonstrated that they are promising materials for the fabrication of passive and active components for photonic applications.

    Palavras-Chave: doped materials; lasers; glass; photon beams; waveguides; optical properties

  • IPEN-DOC 28108

    NACARATTI, DAVI P.; SAMAD, RICARDO E. ; MOTTA, CLAUDIO C.. Modeling of fiber Bragg gratings with different lengths for the reflectivity control for fiber lasers. In: SBFOTON INTERNATIONAL OPTICS AND PHOTONICS CONFERENCE, May 31 - June 2, 2021, Online. Proceedings... Piscataway, NJ, USA: IEEE, 2021. DOI: 10.1109/SBFOTONIOPC50774.2021.9461968

    Abstract: An analytical formulation and modeling of an optical fiber Bragg gratings has been developed and is reported in this paper. Supported by the coupled-mode theory and considering that the mode fields of the unperturbed waveguide remain unchanged in the presence of weak perturbations, it is possible to obtain first-order differential equations that have solutions for some types of periodic perturbations. Finally, the model is applied to analyze the influence of structural parameters of fiber gratings, such as length, period and refractive index modulation on its reflectivity and bandwidth.

    Palavras-Chave: bragg reflection; optical fibers; fiber optics; gratings; transfer matrix method

  • IPEN-DOC 28107

    DEL VALLE, MATHEUS ; STANCARI, KLEBER ; CASTRO, PEDRO A.A. de ; SANTOS, MOISES O. dos ; ZEZELL, DENISE M. . Machine Learning methods for micro-FTIR imaging classification of human skin tumors. In: SBFOTON INTERNATIONAL OPTICS AND PHOTONICS CONFERENCE, May 31 - June 2, 2021, Online. Proceedings... Piscataway, NJ, USA: IEEE, 2021. DOI: 10.1109/SBFotonIOPC50774.2021.9461969

    Abstract: This review presents some methods applied to micro-FTIR imaging for classification of human skin tumors. It is a collection of the pre-processing pipeline and machine learning classification models. The aim of this review is to update and summaiize the current methods which an applied in our skin tumor research.

    Palavras-Chave: skin diseases; tumor cells; infrared radiation; fourier transformation; machine learning; spectra

  • IPEN-DOC 28106

    VIEIRA JUNIOR, NILSON D. ; MALDONADO, EDISON P.; BONATTO, ALEXANDRE; NUNES, ROGER P.; BANERJEE, SUDEEP; GENEZINI, FREDERICO A. ; MORALLES, MAURICIO ; ZUFFI, ARMANDO V.F. ; SAMAD, RICARDO E. . Laser wakefield electron accelerator: possible use for radioisotope production. In: SBFOTON INTERNATIONAL OPTICS AND PHOTONICS CONFERENCE, May 31 - June 2, 2021, Online. Proceedings... Piscataway, NJ, USA: IEEE, 2021. DOI: 10.1109/SBFOTONIOPC50774.2021.9461976

    Abstract: Electron beams generated by laser wakefield acceleration can induce a photoneutron reaction to convert 100Mo into 99Mo. Multi-pC, several-MeV electron beams, obtained from particle-in-cell simulations, could generate bremsstrahlung gamma photons within the absorption region of the photonuclear reaction. The efficiency of this process is estimated for a laser accelerator operating at kHz repetition rate in the self-modulated regime. The electron beam kinetic energy must be improved to 40MeV. To meet the typical consumption of 99Mo per patient within its decay timescale, this efficiency must be increased by three orders of magnitude.

    Palavras-Chave: nuclear medicine; radioisotopes; wakefield accelerators; diagnostic techniques; electron beams; photoneutrons

  • IPEN-DOC 28105

    SAMAD, RICARDO E. ; MALDONADO, EDISON P.; ROSSI, WAGNER de ; VIEIRA JUNIOR, NILSON D. . High intensity ultrashort laser pulses and their applications at IPEN. In: SBFOTON INTERNATIONAL OPTICS AND PHOTONICS CONFERENCE, May 31 - June 2, 2021, Online. Proceedings... Piscataway, NJ, USA: IEEE, 2021. DOI: 10.1109/SBFOTONIOPC50774.2021.9461930

    Abstract: Ultrashort laser pulses interact with matter in unique, nonselective ways, due to electronic direct excitation in an ultrafast time scale. Additionally, these pulses can cover peak powers from kW to PW, allowing its use to induce from nonlinear optics up to relativistic phenomena. Here we present a quick overview of the important processes induced in matter by high-intensity ultrashort pulses, and describe results obtained in our laboratory, including our most recent goal of accelerating electrons with ultrashort pulses for practical applications.

    Palavras-Chave: lasers; pulses; laser radiation; waveguides; ionization

  • IPEN-DOC 28104

    CASTRO, PEDRO ; ZORN, TELMA; ZEZELL, DENISE . Healing status of bum wound healing: ATR-FTIR study. In: SBFOTON INTERNATIONAL OPTICS AND PHOTONICS CONFERENCE, May 31 - June 2, 2021, Online. Proceedings... Piscataway, NJ, USA: IEEE, 2021. DOI: 10.1109/SBFotonIOPC50774.2021.9461956

    Abstract: The purpose of this study is to use infrared spectroscopy (FTIR) for monitoring biological changes in burned skin. Wistar rats dorsum samples were compared to healthy group samples at 7, 14, 21 days after burn. Proteins changes of burn wounds were monitored by area under the curve (AUC) of bands at 1630 cm 1 , 1543 cm 1 and 1743 cm 1 . Kruskal-Wallis normality tests, unpaired t test with Welch's correction were used to evaluate the differences between AUC. These bands suggest association between collagen activity during wound healing stages. Our result indicates progressive recovery of 7,14 and 21 days tissues when compared with the healthy group.

    Palavras-Chave: fourier transformation; infrared spectra; animal tissues; biological recovery; healing; fourier transform spectrometers; skin; burns

  • IPEN-DOC 28103

    JUVINO, AMANDA C. ; ROMANO, MARIANA; ALVES, NATHALIA Z. ; FREITAS, THAIS R. ; ZAMATARO, CLAUDIA B. ; ZEZELL, DENISE M. . Evaluation of the anti-caries effect beyond the critical enamel pH of preventive treatment of fluoride associated with Nd:YAG laser irradiation. In: SBFOTON INTERNATIONAL OPTICS AND PHOTONICS CONFERENCE, May 31 - June 2, 2021, Online. Proceedings... Piscataway, NJ, USA: IEEE, 2021. DOI: 10.1109/SBFotonIOPC50774.2021.9461860

    Abstract: This study aimed to evaluate the anti-caries effect of fluoride associated with Nd:YAG laser irradiation in the h-eatment of enamel Eight groups (n = S) were analyzed: Negative Control pH 4.5; Negative control pH 4; Fluoride pH 4.5; Fluoride pH 4; Nd-YAG pH 4.5; Nd-YAG pH 4; (Fluoride + Nd-YAG) pH 4.5 and (Fluoride + Nd-YAG) pH 4. All samples were analyzed by Scanning Electron Microscopy (SEM) before and after the cycle. Quantification of phosphorus in the cycling solutions was carried out using the colorimetric method, as an indication of enamel demineralization. The anti-caries effect of the Fluoride + Nd: YAG treatment in addition to the critical pH of the enamel can be observed in the morphological analysis, however in the analysis of the demineralization solutions, the amount of phosphorus showed a difference only in the Fluoiide group compared to the others in the investigative pH.

    Palavras-Chave: dentistry; fluorides; laser radiation; caries; neodymium lasers; ph value

  • IPEN-DOC 28102

    VALLE, MATHEUS del ; SANTOS, MOISES O. dos ; SANTOS, SOFIA N. dos ; BERNARDES, EMERSON S. ; ZEZELL, DENISE M. . Evaluation of machine learning models for the classification of breast cancer hormone receptors using micro-FTIR images. In: SBFOTON INTERNATIONAL OPTICS AND PHOTONICS CONFERENCE, May 31 - June 2, 2021, Online. Proceedings... Piscataway, NJ, USA: IEEE, 2021. DOI: 10.1109/SBFOTONIOPC50774.2021.9461946

    Abstract: The breast cancer is the most incident cancer in women. Evaluation of hormone receptors expression plays an important role to outline treatment strategies. FTIR spectroscopy imaging may be employed as an additional technique, providing extra information to help physicians. In this work, estrogen and progesterone receptors expression were evaluated using tumors biopsies from human cell lines inoculated in mice. FTIR images were collect from histological sections, and six machine learning models were applied and assessed. Xtreme gradient boost and Linear Discriminant Analysis presented the best accuracies results, indicating to be potential models for breast cancer classification tasks.

    Palavras-Chave: mammary glands; neoplasms; fourier transformation; images; machine learning; hormones; receptors

  • IPEN-DOC 28101

    MALDONADO, EDISON P.; SAMAD, RICARDO E. ; BONATTO, ALEXANDRE; NUNES, ROGER P.; BANERJEE, SUDEEP; VIEIRA JUNIOR, NILSON D. . Electron beam properties in self-modulated laser wakefield acceleration using TW and sub-TW pulses. In: SBFOTON INTERNATIONAL OPTICS AND PHOTONICS CONFERENCE, May 31 - June 2, 2021, Online. Proceedings... Piscataway, NJ, USA: IEEE, 2021. DOI: 10.1109/SBFOTONIOPC50774.2021.9461971

    Abstract: We review the fundamentals of electron beam generation in self-modulated laser wakefield acceleration (SM-LWFA) using laser pulses with peak powers on the TW and sub-TW scale. The results of several new particle-in-cell simulations for λ = 0.8 μm and a thin H2 gas target are shown. By scanning the peak gas density and peak power values of the incident laser, we discuss the resulting acceleration processes, as well as the characteristics of the electron beams generated for different conditions. Our approach provides a method to optimize these beams with lasers operating at kHz repetition rates.

    Palavras-Chave: wakefield accelerators; lasers; particles; plasma simulation

  • IPEN-DOC 28100

    CHIOMENTO, BRUNO B. ; ZUFFI, ARMANDO V.F. ; VIEIRA JUNIOR, NILSON D. ; TABACOW, FABIO B.D. ; MALDONADO, EDISON P.; SAMAD, RICARDO E. . Development of dielectric de Laval nozzles for laser electron acceleration by ultrashort pulses micromachining. In: SBFOTON INTERNATIONAL OPTICS AND PHOTONICS CONFERENCE, May 31 - June 2, 2021, Online. Proceedings... Piscataway, NJ, USA: IEEE, 2021. DOI: 10.1109/SBFOTONIOPC50774.2021.9461928

    Abstract: This work reports the development and experimental implementation of a methodology for manufacturing submillimetric de Laval nozzles by ultrashort laser pulses micromachining by trepanning. The use of a ceramic substrate resulted in the fabrication of nozzles with high circularity and low roughness, which should generate high-quality gas targets for accelerating electrons with ultrashort laser pulses.

    Palavras-Chave: lasers; wakefield accelerators; nozzles; measuring methods

  • IPEN-DOC 28099

    ZUFFI, ARMANDO V.F. ; MALDONADO, EDISON P.; VIEIRA JUNIOR, NILSON D. ; SAMAD, RICARDO E. . Development of a modified Mach–Zehnder interferometer for time and space density measurements for laser wakefield acceleration. In: SBFOTON INTERNATIONAL OPTICS AND PHOTONICS CONFERENCE, May 31 - June 2, 2021, Online. Proceedings... Piscataway, NJ, USA: IEEE, 2021. DOI: 10.1109/SBFOTONIOPC50774.2021.9461961

    Abstract: This work reports the development of a modified Mach–Zehnder interferometer aimed at determining the density of gas targets and laser generated plasmas, in time and space. This interferometer will compose our laboratory implementations for laser wakefield acceleration, allowing the characterizations of gas jet profiles generated by submillimeter nozzles. The technique also allows us to estimate the temporal evolution of the plasma density.

    Palavras-Chave: interferometry; wakefield accelerators; lasers; jets; measuring methods; plasma density

  • IPEN-DOC 28098

    RODRIGUES, FABRIZIO M.; SILVA, LARISSA S.N. da; ZEZELL, DENISE M. ; ANA, PATRICIA A.. Compositional changes promoted by Er,Cr:YSGG laser when used to inhibit dentin erosion. In: SBFOTON INTERNATIONAL OPTICS AND PHOTONICS CONFERENCE, May 31 - June 2, 2021, Online. Proceedings... Piscataway, NJ, USA: IEEE, 2021. DOI: 10.1109/SBFOTONIOPC50774.2021.9461943

    Abstract: Lasers are used for preventing demineralization, but there are no studies that report the compositional changes on root dentin irradiated with Er,Cr:YSGG (2.78μm) laser in an erosive process. In this in vitro study, fifty dentin slabs were distributed in 5 groups to be treated with Er,Cr:YSGG laser associated or not with application of acidulated phosphate fluoride gel (APF-gel); then, a 10-days erosion regimen was conducted and the composition changes were monitored by Fourier transform infrared spectroscopy. The data suggest a synergistic effect between laser irradiation and APF-gel, with a greater preventive effect when APF-gel was applied after irradiation.

  • IPEN-DOC 28097

    MELO, PEDRO B. dos S.; SAMAD, RICARDO E. ; MOTTA, CLAUDIO C.. Analytical formulation of an Yb-doped tandem-pumping fiber amplifier. In: SBFOTON INTERNATIONAL OPTICS AND PHOTONICS CONFERENCE, May 31 - June 2, 2021, Online. Proceedings... Piscataway, NJ, USA: IEEE, 2021. DOI: 10.1109/SBFOTONIOPC50774.2021.9461980

    Abstract: An analytical formulation of a multi-kilowatt ytterbium-doped double-cladding tandem-pumped fiber amplifier was developed and is reported in this paper. The model consists of a system including the laser rate, pumping and seed power equations. The model was validated by describing a fiber amplifier behavior with a 5.986kW, 1018nm pumping and a signal seed of 75W, 1080nm, yielding a maximum power output of 5.448kW, with an efficiency of 91.1%. The thermal equations are solved for the temperature distribution along the fiber with a maximum temperature of 43.24°C, when the convective coefficient of 4000W. m-2. K -1 is used.

  • IPEN-DOC 28096

    POLO, IVON O. ; JUNOT, DANILO O. ; CALDAS, LINDA V.E. . TL response of CaSO4:Eu,Ag detectors in 90Sr/90Y beta radiation beam. In: WORKSHOP ON NUCLEAR PHYSICS, 17th, April 1-5, 2019, Havana, Cuba. Proceedings... 2019.

    Abstract: The results of the TL response of the CaSO4:Eu,Ag detectors in the 90Sr/90Y beams of the BSS2 system of the LCI/ IPEN are presented. The TL glow curves were obtained from doses between 30 mGy and 500 mGy. The detectors showed a good reproducibility of the TL response. The calculated calibration factor was (1.166 ± 0.024) x10-3 mGy/a.u. and the factor determined by linear fitting was (1.120 ± 0.014) x10-3 mGy/a.u., showing a difference of only 3.9%. The lower limit of detection was (4.96 ± 0.06) mGy. The detectors indicated the appropriate sensitivity for 90Sr/90Y beta radiation. Preliminary results show suitable dosimetric characteristics for the establishment of a transfer system for beta dosimetry of 90Sr/90Y beams.

  • IPEN-DOC 28092

    CAPPUZZELLO, F.; AGODI, C.; ACOSTA, L.; ALTANA, C.; AMADOR-VALENZUELA, P.; AUERBACH, N.; BAREA, J.; BELLONE, J.; BIJKER, R.; BONANNO, D.; BORELLO-LEWIN, T.; BOZTOSUN, I.; BRANCHINA, V.; BRASOLIN, S.; BRISCHETTO, G.; BRUNASSO, O.; BURRELLO, S.; CALABRESE, S.; CALABRETTA, L.; CALVO, D.; CAPIROSSI, V.; CARBONE, D.; CAVALLARO, M.; CHARON GARCIA, L.E.; CHAVEZ LOMELI, E.R.; CHEN, R.; CIRALDO, I.; COLONNA, M.; D’AGOSTINO, G.; DELAUNAY, F.; DESHMUKH, N.; DJAPO, H.; DE GERONIMO, G.; DE LOS RIOS, K.; FERRARESI, C.; FERREIRA, J.L.; FERRETTI, J.; FINOCCHIARO, P.; FIRAT, S.; FISICHELLA, M.; FOTI, A.; GALLO, G.; GARCIA-TECOCOATZI, H.; HACISALIHOGLU, A.; HUERTA-HERNANDEZ, A.; KOTILA, Z.J.; KUCUK, Y.; IAZZI, F.; LANZALONE, G.; LAY, J.A.; LA FAUCI, L.; LA VIA, F.; LENSKE, H.; LINARES, R.; LO PRESTI, D.; LUBIAN, J.; MA, J.; MARIN-LAMBARRI, D.; MAS RUIZ, J.; MEDINA, N.H.; MENDES, D.R.; MEREU, P.; MORALLES, M. ; NERI, L.; OLIVEIRA, J.R.B.; PAKOU, A.; PANDOLA, L.; PETRASCU, H.; PIETRALLA, N.; PINNA, F.; REITO, S.; RIES, P.; RODRIGUES, M.R.D.; RUSSO, A.D.; RUSSO, G.; SANTOPINTO, E.; SANTOS, R.B.B.; SERBINA, L.; SGOUROS, O.; SILVEIRA, M.A.G. da; SOLAKCI, S.O.; SOULIOTIS, G.; SOUKERAS, V.; SPATAFORA, A.; TORRESI, D.; TUDISCO, S.; VARGAS HERNANDEZ, H.; VSEVOLODOVNA, R.I.M.; WANG, J.S.; WERNER, V.; YANG, Y.Y.; YILDIRIN, A.; ZAGATTO, V.A.B.. The NUMEN project @ LNS: status and perspectives. In: CIVITARESE, OSVALDO (Ed.); STEKL, IVAN (Ed.); SUHONEN, JOUNI (Ed.) WORKSHOP ON CALCULATION OF DOUBLE-BETA-DECAY MATRIX ELEMENTS, May 27-31, 2019, Prague, Czech Republic. Proceedings... Melville, NY, USA: AIP Publishing, 2019. p. 020003-1 - 020003-6. (AIP Conference Proceedings, 2165). DOI: 10.1063/1.5130964

    Abstract: The NUMEN project aims at accessing experimentally driven information on Nuclear Matrix Elements (NME) involved in the half-life of the neutrinoless double beta decay (0νββ), by high-accuracy measurements of Heavy Ion (HI) induced Double Charge Exchange (DCE) reaction cross sections. In particular, the (18O,18Ne) and (20Ne,20O) reactions are used as tools for β+β+ and β-β- decays, respectively. In the experiments, performed at INFN - Laboratory Nazionali del Sud (LNS) in Catania, the beams are accelerated by the Superconducting Cyclotron (CS) and the reaction ejectiles are detected the MAGNEX magnetic spectrometer. The measured cross sections are challengingly low (a few nb), being the total reaction cross section much larger (a few b), thus a high sensitivity and a large rejection capability are demanded to the experimental set-up. This limits the present exploration to few selected isotopes of interest in the context of typically low-yield experimental runs. A major upgrade of the LNS facility is foreseen in order to increase the experimental yield of at least two orders of magnitude, still keeping the high sensitivity of the present set-up, making it feasible a systematic study of all the cases of interest. Frontiers technologies are going to be developed, to this purpose, for the accelerator and the detection systems. In parallel, advanced theoretical models are being developed in order to extract the nuclear structure information from the measured cross sections.

  • IPEN-DOC 28091

    STEFANI, GIOVANNI L. de ; MAIORINO, JOSE R. . The AP-Th 1000 an advanced concept to use MOX of thorium in a closed fuel cycle. In: INTERNATIONAL CONFERENCE ON EMERGING NUCLEAR ENERGY SYSTEMS, 19th, October 6-9, 2019, Bali, Indonesia. Proceedings... 2019.

    Abstract: This work presents a study for the firsts 4 cycles of recharge of the reactor AP-Th1000, a version of the reactor AP1000 using mixed uranium and thorium oxides as fuel, which the feasibility studies had been already demonstrated in previous study for a first cycle. The AP-Th 1000 study is a proposal to start the thorium fuel cycle using the most common reactor technology in the nuclear industry, the Pressurized Water Reactors (PWR). A preliminary closed cycle study is carried out for the first 4 cycles where the production of 233U are evaluated. In cycles 2, 3 and 4, new assemblies with a fuel of the remaining uranium from the previous cycle are used instead of assemblies removed from the core, thus being a mixture of different uranium’s (232U, 233U, 234U, 235U, 236U and 238U) , where the additional fissile material inserted into the fuel to ensure the 18-month operation of the reactor comes from uranium oxides enriched at 20 w / o.. The results demonstrate the viability of the proposal and again using closed fuel cycle.

  • IPEN-DOC 28087

    VARELA, B.A.; TRESINARI, B.; ROSSI, M.G.; PIRES, N.S.; PIRES, M.C.; VASQUEZ, P.A.S. ; JURKIEWICZ, C.. Aplicação do processo de irradiação com raios gama na conservação de fécula de mandioca hidratada. In: CONGRESSO BRASILEIRO DE ENGENHARIA QUÍMICA, 22., 23-26 de setembro, 2018, São Paulo, SP. Anais... São Paulo, SP: Blucher, 2018. p. 2805-2808. DOI: 10.5151/cobeq2018-PT.0742

    Abstract: O processo de irradiação com raios gama pode ser utilizado para aumentar a vida útil dos alimentos através da redução do número de bactérias deteriorantes. Fécula de mandioca hidratada (tapioca) foi irradiada com raios gama provindos do cobalto 60 com doses absorvidas de 5, 9 e 13 kGy e armazenada a 25 °C por 45 dias. Todas as doses avaliadas reduziram as contagens abaixo do nível de detecção dos métodos, no primeiro dia de armazenamento. Apenas a dose de 13 kGy evitou a multiplicação de bolores e leveduras, enquanto os demais microrganismos atingiram contagens de até 10(4) UFC/g. A análise sensorial pelo método triangular, mostrou diferença não significativa entre a amostra irradiada e não irradiada.

  • IPEN-DOC 28085

    ROSSI, A. ; ABBADE, L. ; LARA, J.A.C. ; JESUS, E.R.B.; COLOSIO, M.A.; BARBOSA, L.P. ; ROSSI, J.L. ; MUCSI, C.S. . Tensile testing and digital image correlation of 22MnB5 press hardened steel (PHS). In: ENCONTRO CIENTÍFICO DE FÍSICA APLICADA,11., 1-4 de dezembro, 2020, Vitória, ES. Anais... São Paulo, SP: Blucher, 2021. p. 67-74. DOI: 10.5151/xiecfa-Rossi-A_R

    Abstract: Spot welding is a widely used tool for joining sheets parts in the automotive industry. As 22MnB5 steel has the adequate mechanical strength to withstand lateral impact and rollover stresses, it was chosen for the use in B-pillar. It was observed the need to study the spot welded joints, due to the increased need of the automobile industry in reducing the weight vehicle and increasing the passengers' safety in compliance with Resolution of the National Traffic Council of Brazil - CONTRAN n° 751 on the lateral collision test. The microstructure of this steel, in the as fabricated condition, is basically formed by ferrite and perlite, with a tensile strength limit of 600 MPa. This steel is designed to undergo rapid cooling during hot stamping. After this process, this steel presents a completely martensitic microstructure and tensile strength close to 1500 MPa. This work aimed to investigate the strength of spot welded specimens under different experimental conditions, observing the deformations during the tensile tests. The tests were digitally recorded and the sequenced frames were analyzed using a method called digital image correlation (DIC).

  • IPEN-DOC 28084

    ALENCAR, M.A. ; BARBOSA, L.P. ; MUCSI, C.S. ; ROSSI, A. ; ROSSI, J.L. . Efeito do estiramento à frio no aço utilizado na fabricação de rodas avaliado por propriedades mecânicas. In: ENCONTRO CIENTÍFICO DE FÍSICA APLICADA,11., 1-4 de dezembro, 2020, Vitória, ES. Anais... São Paulo, SP: Blucher, 2021. p. 46-51. DOI: 10.5151/xiecfa-Alencar

    Abstract: Este estudo teve como objetivo a investigação e avaliação das propriedades mecânicas, antes e depois, dos processos de soldagem e do estiramento (metal spinning) do aço utilizado na fabricação de rodas para caminhões e ônibus. Comercialmente, a roda é constituída de dois componentes, o aro e o disco. O estiramento na fabricação de rodas é utilizado para aumentar a largura do componente aro, e na conformação do componente disco, que devem atender perfis determinados em projeto, de modo a resistir aos testes de fadiga por ciclagem e de momentos de flexão e torção, alternados. A presente proposta estudou os efeitos do processo de estiramento, pois com o melhor entendimento destes efeitos, poder-se-á maximizar a otimização da massa da roda, um importante objetivo a ser alcançado para o setor de fabricação de rodas de aço. Os métodos propostos para a identificação dos efeitos do estiramento no aço empregado para a fabricação de rodas foram ensaios de tração, análise metalográfica, análise do comportamento das deformações do material durante os ensaios de tração, utilizando a técnica de correlação de imagens digitais (DIC), somados a mapas de dureza, executados no material antes e após o processo de estiramento. As variações dos percentuais de redução de espessuras no processo de estiramento foram correlacionadas com as variações de resistência a tração, para verificação da relação da variação de espessura com a variação dos valores de resistência a tração, evidenciando um aumento na tensão de ruptura a tração a cada aumento de percentual de redução de espessura do material no estiramento, chegando a um aumento de 50% na resistência a tração, numa redução de 55% na espessura da matéria prima, com a consequente perda na deformação.

  • IPEN-DOC 28083

    ABBADE, L. ; LARA, J.A.C. ; ROSSI, A. ; ALENCAR, M.A. ; ROSSI, J.L. ; MUCSI, C.S. . Resultados preliminares do estudo da união de chapas de aços dissimilares pela técnica brasagem MIG. In: ENCONTRO CIENTÍFICO DE FÍSICA APLICADA,11., 1-4 de dezembro, 2020, Vitória, ES. Anais... São Paulo, SP: Blucher, 2021. p. 122-126. DOI: 10.5151/xiecfa-Abbade_Marcelo

    Abstract: A busca em fabricar veículos cada vez mais sustentáveis e seguros, por conta da crise dos recursos naturais e a preocupação com a segurança veicular, fez crescer o uso de novos matérias e métodos de conformação e união dos componentes da carroceria. As propriedades da coluna B determinam a segurança dos passageiros em caso de colisão lateral. A coluna B é constituída por materiais diferentes, e por isso, necessitam de um processo de união adequado. Assim, o objetivo do presente trabalho é realizar a caracterização mecânica da união entre o aço 22MnB5 tratado termicamente (têmpera) e o aço CR4, pela técnica brasagem MIG com adição do arame Cu-Si e o gás de proteção argônio. Os materiais utilizados foram, amostras do aço 22MnB5 revestidas por Al-Si e CR4 revestido por Zinco. A união foi realizada a partir de um projeto de corpo de prova, nomeado de furo oblongo regular. Os ensaios realizados (dureza Vickers e metalografia), se enquadram na norma AWS A5 C3. 3-2008. Os resultados obtidos, demonstraram uma queda na resistência mecânica na zona termicamente afetada pelo calor do aço 22MnB5, isso pode ter ocorrido devido ao aquecimento da região, que apresentou mudanças na microestrutura, porém a dureza desse material ainda é maior que no CR4. Nesse caso é foi possível concluir que mesmo com queda na resistência do aço 22MnB5, em um possível ensaio de tração o destacamento da união ocorreria no CR4, uma vez que a resistência deste material é menor.

  • IPEN-DOC 27978

    WATANABE, TAMIRES ; GUILHEN, SABINE N. ; MARUMO, JULIO T. ; ARAUJO, LEANDRO G. de . Uranium biosorption by hydroxyapatite and bone meal. In: AZEVEDO, DIANA C.S. de (Org.); BASTOS-NETO, MOISES (Org.) ENCONTRO BRASILEIRO DE ADSORÇÃO, 13th, November 25 - December 3, 2020, Online. Anais... Fortaleza, CE: Imprensa Universitária, 2021. p. 714-718. DOI: 10.51996/9786588492529

    Abstract: Biosorption has been widely examined for the treatment of aqueous solutions containing uranium, a radiotoxic pollutant. The use of hydroxyapatite and bone meal as potential biosorbents in the removal of uranium (U) from aqueous solutions has not yet been previously addressed. In this work, the efficiency of these biosorbents in the removal of U was investigated according to their adsorption removal capacities. Surface transformations in both materials were observed after U adsorption by scanning electron microscopy combined with energy-dispersive X-ray spectroscopy (SEM/EDS). The biomass/U solution ratio was kept at 0.1 g/5 mL. Contact times for the batch experiments were 15, 30, 60, 120, and 180 min, and the concentration of U tested was 680 mg L-1. The equilibrium was achieved in less than 15 min for both materials. The morphological characteristics of each biomass, before and after biosorption experiments were analyzed. Bone meal highlighted slightly superior adsorption results in terms of maximum capacity (qmax = 33.83 mg g-1), compared to hydroxyapatite (qmax = 33.36 mg g-1), with the removal percentages being also similar, 99.97 and 98.57 %, respectively. The results so far indicate that these materials are potential biosorbents for the treatment of uranium-contaminated solutions, especially liquid radioactive waste.

    Palavras-Chave: adsorption; uranium; bone tissues; apatites

  • IPEN-DOC 27977

    VASQUEZ, P.A.S. ; MORAIS, F.; LIMA, F.S.; SANTOS, P.S. ; MORAES, O.; ARTAXO, P.; JOHN, V.M.; NAGAI, M.L.E.; OLIVEIRA, M.J.A. ; CATALANI, L.H.; KODAMA, Y. ; OTUBO, L. . Development of methodologies for decontamination, reuse and improvement of the properties of respiratory protective equipment using ionizing radiation: preliminary results. In: WEBINAR COVID-19 PANDEMIC: RADIATION STERILIZATION OF PPE (PERSONAL PROTECTIVE EQUIPMENT), May 21, 2020, Online. Apresentação... Vienna, Austria: International Atomic Energy Agency, 2020.

    Palavras-Chave: decontamination; equipment; radiation protection; ionizing radiations; safety

  • IPEN-DOC 27973

    FOLHADELLA, KELLY C.F.; SILVA, IVES C. da; FREITAS, ANDERSON Z. de ; GARCEZ, AGUINALDO S.; NUNEZ, SILVIA C.. Estudo dose-resposta da atuação do laser de baixa potência sobre processo inflamatório induzido por carragenina em Zebrafish. In: CAMPATO JUNIOR, JOÃO A. (Org.) CONGRESSO ACADÊMICO E TECNOLÓGICO DA UNIVERSIDADE BRASIL, 1.; ENCONTRO DE INICIAÇÃO CIENTÍFICA, 14.; ENCONTRO DE PÓS-GRADUAÇÃO, 8., 04-05 de dezembro, 2020, Online. São José do Rio Preto, SP: HN Editora, 2020. p. 610-614.

    Abstract: Este estudo foi pensado para desenvolver uma alternativa de pesquisa mais acessível para que formas não farmacológicas de tratamento, como é o caso da fotobiomodulação, possam ser mais bem compreendidas e aprimoradas. Aqui, o zebrafish foi utilizado como modelo experimental para tratamento pela fotobiomodulação da inflamação induzida por carragenina. O tratamento da inflamação induzida foi feito com laser 660nm e a análise dos resultados realizada através de processamento histológico e OCT (Optical Coherence Tomography). A análise qualitativa dos resultados mostrou que o zebrafish representa um bom modelo alternativo e menos oneroso para o estudo da ação da fotobiomodulação sobre processos inflamatórios.

    Palavras-Chave: fishes; modulation; inflammation; lasers; therapeutic uses

  • IPEN-DOC 27971

    KONDO, F.M. ; DUARTE, C.L. ; SOMESSARI, S.L. ; SATO, M.I. ; SALVADOR, V.L.R. ; LIMA, N.B. ; MARTINELLI, J.R. ; CALVO, W.A.P. . Extraction of molybdenum from spent cracking catalysts. In: INTERNATIONAL MEETING ON RADIATION PROCESSING, 19th, April 1-5, 2019, Strasbourg, France. Proceedings... 2019.

    Abstract: A catalyst is a substance that changes the rate of a reaction. In the petroleum industry, the catalysts are commonly used for Fluid Catalytic Cracking (FCC) and Hydro Catalytic Cracking (HCC), each of them applied in a specific stage. These catalysts are used to facilitate the molecular chains cracking, which will generate a mixture of hydrocarbons. However, the catalyst gradually loses its activity, either by changing its original molecular structure or by its contamination from other petroleum molecules. The application of ionizing radiation (medium-energy electron beam) over these spent catalysts was studied to contribute the extraction of metals or rare-earths of high added-value. Tests conducted with HCC catalysts were used the technique of electron beam irradiation (1.3 MeV) and had as a subject the extraction of Molybdenum. Energy Dispersive X-ray (EDX) analysis was performed on a Shimadzu EDX-720/800HS and X-ray Diffraction (XRD) analysis on a Rigaku MultiFlex. Electron beam irradiation had a positive contribution if compared to traditional thermal and chemical methods. In temperature around 750°C, HCC irradiated catalysts of the lower region have an extraction of Molybdenum (MoO3) yield twice higher compared to non-irradiated ones, in other words 57.65% and 26.24%, respectively.

    Palavras-Chave: catalytic cracking; molybdenum; electron beams; hydrocracking

  • IPEN-DOC 27970

    GASPAR, R.R. ; SOMESSARI, S.L. ; SPRENGER, F.E. ; FEHER, A. ; DUARTE, C.L. ; SAMPA, M.H.O. ; LAINETTI, F.F. ; FUGA, D.F.; RODRIGUES, M.; CALVO, W.A.P. . Developing an electrical power system of a mobile electron beam accelerator to treat wastewater and industrial effluents. In: INTERNATIONAL MEETING ON RADIATION PROCESSING, 19th, April 1-5, 2019, Strasbourg, France. Proceedings... 2019.

    Abstract: The treatment of wastewater and industrial effluents by electron beam irradiation is a promising technique, however, not very widespread in Brazilian territory. The design and construction of a mobile unit by the Nuclear and Energy Research Institute, containing an electron beam accelerator of 700 keV and 20 kW is innovative to demonstrate the effects and positive results of this technology. The aim is to transfer the mobile unit to several companies with interest in liquid waste treatment, connect to the industry electrical system and start the ionization treatment process through electron beam. The mobile unit connection to the local electrical system may be a challenge due to the great diversity of voltages and distances involved, as well as the large injections of harmonic content generated by the electron beam accelerator that can affect sensitive loads in the industrial system. In this work, an analysis of the electrical power system of the mobile unit was made, regarding the interruption capacity, selectivity protection and adequate short circuit levels, in order to assure a greater reliability in the operation. At the end, the control panel of the mobile unit, simulations and measurements were carried out at the 1.5 MeV and 37.5 kW electron beam accelerator, installed in the Radiation Technology Center, demonstrating the necessity of applying a filter to reduce the measured harmonic distortion. The analysis of the mobile unit electrical power system was made, in order to assure a greater reliability in the operation.

    Palavras-Chave: waste water; liquid wastes; water treatment; electric power; accelerators; radiation sources; portable equipment; electron beams

  • IPEN-DOC 27969

    LAINETTI, F.F. ; DUARTE, C.L. ; SOMESSARI, S.L. ; SPRENGER, F.E. ; FEHER, A. ; SAMPA, M.H.O. ; GASPAR, R.R. ; FUGA, D.; RODRIGUES, M.; CALVO, W.A.P. . Architectural design of a mobile irradiation unit for the treatment of industrial effluents in Brazil. In: INTERNATIONAL MEETING ON RADIATION PROCESSING, 19th, April 1-5, 2019, Strasbourg, France. Proceedings... 2019.

    Abstract: The Nuclear and Energy Research Institute (IPEN-CNEN/SP) decided to develop and build a mobile beam irradiation unit for the treatment of industrial effluents. The mobile unit will have as one of its main advantages the possibility of treating effluents in the place where the source is located, eliminating costs and bureaucratic problems associated with the transportation of waste, besides publicizing the technology in several places in Brazil. To implement the project, IPEN-CNEN/SP has been consolidating partnerships with national and international companies. The resources for the development of the unit have been supplied by the Brazilian Innovation Agency (FINEP) and International Atomic Energy Agency, financing the IAEA TC Project BRA1035 – Mobile electron beam accelerator to treat and recycle industrial effluents. The Institute hired a specialized company (Truckvan Industry) for the unit design and development. Several meetings have been realized with the company and the IAEA experts aiming the compatibility of the design and the exchange of information necessary for the project development. Regarding the mobile lab, several layout options have been developed to better meet the needs of each device and its users. The layout has been discussed with the objective of facilitating the maintenance of the equipment; the well-being and ergonomics of operators; optimization of spacing and also to make compatible the need for the presence of equipment and space for operators. Thus, several studies have been prepared to allow the discussion between the areas involved and to optimize the project, as well as the visualization of the spaces available. In this paper is presented the approach adopted for the architectural design of a mobile irradiation unit in Brazil.

    Palavras-Chave: waste water; liquid wastes; water treatment; accelerators; portable equipment; electron beams; radiation sources

  • IPEN-DOC 27963

    ABE, ALFREDO ; TEIXEIRA, ANTONIO ; SOUZA, DANIEL ; GIOVEDI, CLAUDIA. Preliminary assessment of iron alloy cladding as accident tolerant fuel cladding. In: TECHNICAL MEETING ON MODELLING OF FUEL BEHAVIOUR IN DESIGN BASIS ACCIDENTS AND DESIGN EXTENSION CONDITIONS, May 13-16, 2019, Shenzhen, China. Apresentação... 2019.

    Palavras-Chave: waste water; liquid wastes; industrial wastes; accelerators; portable equipment; electron beams

  • IPEN-DOC 27956

    AYLLON, RAFAELLA M. ; EL HAJJ, THAMMIRIS M.; SILVA, PAULO S.C. da ; TORQUATO, HENRIQUE; SCAPIN, MARCOS A. ; GARCIA, RAFAEL H.L. . Radiological and mineralogical characterization of the tailings of a niobium ore treatment plant in Brazil. In: INTERNATIONAL SYMPOSIUM ON NATURALLY OCCURRING RADIOACTIVE MATERIAL, 9th, September 23-27, 2019, Denver, Colorado, USA. Apresentação... 2019.

    Palavras-Chave: niobium ores; industrial plants; mineral industry; natural radioactivity; radiation hazards; trace amounts

  • IPEN-DOC 27955

    VAN VELZEN, LEO; DRAGOLICI, FELICIA; ROBINS, REBECCA; MARUMO, JULIO T. ; FERNANDO, KAPILA; VANLSEGHEM, PIERRE; KASHIWAGI, MAKOTO. IAEA LABONET - International Network for Radioactive Waste Characterization - Support of the non-nuclear industry at the characterization of NORM. In: INTERNATIONAL SYMPOSIUM ON NATURALLY OCCURRING RADIOACTIVE MATERIAL, 9th, September 23-27, 2019, Denver, Colorado, USA. Apresentação... 2019.

    Palavras-Chave: radioactive waste management; nuclear energy; knowledge management; international organizations; international cooperation

  • IPEN-DOC 27954

    MAZZILLI, BARBARA ; SAUEIA, CATIA ; NISTI, MARCELO . Radiological implications of using phosphogypsum as soil conditioner: a case study of Brazil. In: INTERNATIONAL SYMPOSIUM ON NATURALLY OCCURRING RADIOACTIVE MATERIAL, 9th, September 23-27, 2019, Denver, Colorado, USA. Apresentação... 2019.

    Palavras-Chave: phosphates; gypsum; fertilizers; soils; agriculture; chemical composition; radiation hazards; radioisotopes

  • IPEN-DOC 27953

    CAMPOS, MARCIA P. de ; NISTI, MARCELO B. ; PASCHOALIN FILHO, JOAO A.; MAZZILLI, BARBARA P. . Radiological evaluation of bricks made with NORM residue. In: INTERNATIONAL SYMPOSIUM ON NATURALLY OCCURRING RADIOACTIVE MATERIAL, 9th, September 23-27, 2019, Denver, Colorado, USA. Apresentação... 2019.

    Palavras-Chave: radioactive materials; residues; building materials; phosphates; gypsum; radioactivity

  • IPEN-DOC 27951

    CARVALHO, PATRICIA R. ; MUNITA, CASIMIRO S. ; NEVES, EDUARDO G.; ZIMPEL, CARLOS A.. A provenance assessment of ancient pottery through instrumental neutron activation analysis at the Monte Castelo site, Rondônia, Brazil. In: INTERNATIONAL CONFERENCE ON MODERN TRENDS IN ACTIVATION ANALYSIS, 15th, November 17-22, 2019, Mumbai, India. Proceedings... 2019.

    Abstract: This research aims to contribute to the discussion of ceramic objects found at the Monte Castelo shell mound (sambaqui), an archaeological site located at south west Amazonia, Brazil. The first study performed in the area in the 1980s suggests that this archaeological site is inserted within one of the oldest contexts of ceramic production in Amazonia. Until today, there have not been any studies of the physical and chemical properties of these objects to reconstruct clay procurement practices and contribute to their archaeological interpretation. With this purpose, this paper provides the results of a preliminary chemical characterization of eighty four pottery samples using instrumental neutron activation analysis (INAA) by means of the determination of Ce, Co, Cr, Cs, Eu, Fe, Hf, K, La, Lu, Na, Rb, Sc, Sm, Th, U, Yb and Zn. The compositional analysis produced substantial geochemical data that allowed comparisons of the similarity/dissimilarity between the samples by means of cluster, principal components and discriminant analysis. The results showed the existence of three different chemical groups whose dates range from 3,000 B.P. to 1,500 B.P. and are in agreement with other studies that place the Bacabal phase as the oldest ceramist culture in the Southwest of the Amazon. Additionally, this study provided a solid research framework of investigation that can be employed for more detailed and extensive future studies on ancient human occupation in the research area.

    Palavras-Chave: archaeological sites; neutron activation analysis; sediments; chemical composition; geologic deposits

  • IPEN-DOC 27950

    TUDELA, DIEGO R.G. ; ARAUJO, ASTOLFO G.M.; TATUMI, SONIA H.; MITTANI, JUAN C.R.; MUNITA, CASIMIRO S. . Preliminary evidence of prehistoric human activity by chemical analysis of sediments from Lapa Grande de Taquaraçu archaeological site using INAA. In: INTERNATIONAL CONFERENCE ON MODERN TRENDS IN ACTIVATION ANALYSIS, 15th, November 17-22, 2019, Mumbai, India. Proceedings... 2019.

    Abstract: This paper analyzes the concentrations of Ce, Co, Cr, Cs, Eu, Fe, Hf, K, La, Lu, Nd, Rb, Sc, Sm, Ta, Tb, Th, U, Yb and Zn determined from sixty sediment samples obtained from the Lapa Grande de Taquaraçu archaeological site using instrumental neutron activation analysis, INAA. The archaeological site is located inside a limestone rockshelter in the municipality of Jaboticatubas, about 60 km from Belo Horizonte, Minas Gerais State, Brazil. The dataset was explored by means of cluster analysis, principal component analysis and discriminant analysis. The study showed three different compositional groups that represent sediments from fluvial, colluvial and anthropogenic origins. The crystalline phases of each group were studied using X-ray diffraction, XRD.

    Palavras-Chave: sediments; cluster analysis; charged-particle activation analysis; chemical state; elements; isotope ratio; neutron activation analysis

  • IPEN-DOC 27945

    OLIANI, WASHINGTON L. ; KOMATSU, LUIZ G.H. ; LUGAO, ADEMAR B. ; PARRA, DUCLERC F. . Films of polyethylene-AgNPs: state-of-the-art, ecotoxicological aspects and antimicrobial efficacy. In: CONGRESSO BRASILEIRO DE POLÍMEROS, 15., 27-31 de outubro, 2019, Bento Gonçalves-RS. Anais... São Carlos, SP: Associação Brasileira de Polímeros, 2019. p. 2641-2644.

    Abstract: In recent years, antimicrobial packaging has attracted much attention from the food industry because of the increase in consumer demand for minimally processed, preservative-free-products. Different grades of polyethylene, LLDPE and LDPE play a major role in the film blowing industry and are widely used for packing applications. In our study, blown films of LLDPE / LDPE, and their blends were produced using a twin screw extruder. The combination of PEs as matrix, and silver nanoparticles with oleic acid solution, improved the AgNPs dispersion in the films. The films were evaluated by Scanning Electron Microscopy (SEM), Energy Dispersive Spectroscopy (EDX), and Ecotoxicity. Further, the antibacterial properties of the films were investigated against Escherichia coli (Gram-negative) and Staphylococcus aureus (Gram-positive) bacteria.

    Palavras-Chave: polyethylenes; silver; nanoparticles; oleic acid; antimicrobial agents

  • IPEN-DOC 27944

    KOMATSU, LUIZ G.H. ; OLIANI, WASHINGTON L. ; LUGAO, ADEMAR B. ; PARRA, DUCLERC F. . Aplicação de ZnO como carregador de prata em uma blenda de HMSPP/SEBS visando ação biocida / Aplication of ZnO as carrier of silver in the blend of HMSPP/SEBS for biocide activity. In: CONGRESSO BRASILEIRO DE POLÍMEROS, 15., 27-31 de outubro, 2019, Bento Gonçalves-RS. Anais... São Carlos, SP: Associação Brasileira de Polímeros, 2019. p. 2356-2359.

    Abstract: Este estudo consiste em utilizar o óxido de zinco (ZnO) como carregador de nanoprata metálica (Ag°). Foi testado um método para síntese das partículas com a prata, o método de Turkevich. A confecção dos filmes poliméricos em matriz de HMSPP/SEBS foi realizada via processamento no estado fundido em extrusora. Os materiais obtidos foram caracterizados pelas técnicas de DLS, MEV e ensaios biocidas. As partículas apresentaram-se em tamanhos variando entre 100 à 200 nm, juntamente a isso, elas também apresentaram resultados de morte celular nos ensaios biocidas com as bactérias E.coli e S.aureus de acordo com a norma JIZ 2801.

    Palavras-Chave: films; polymers; zinc oxides; nanoparticles; silver; disinfectants; bacteria

  • IPEN-DOC 27941

    BRANCO, I.S.L. ; ANTUNES, P.C.G. ; SIQUEIRA, P.T.D. ; SHORTO, J.M.B. ; YORIYAZ, H. . Estudo dos efeitos de composição e densidade de materiais tecido equivalentes na distribuição de dose longitudinal em protonterapia / Study of the composition and density effects of tissue equivalent materials on the longitudinal dose distribution in proton therapy. In: CONGRESSO BRASILEIRO DE FÍSICA MÉDICA, 24., 21-24 de agosto, 2019, Santos, SP. Anais... São Paulo, SP: Associação Brasileira de Física Médica, 2019. p. 1-6.

    Abstract: A eficiência de procedimentos radioterápicos depende do equilíbrio entre o fornecimento de altas doses conformadas ao volume tumoral e a restrição das doses recebidas pelos tecidos e órgãos saudáveis circundantes. Sendo uma modalidade de radioterapia, a protonterapia destaca-se neste cenário por possuir vantagens dosimétricas, que, quando combinadas com avanços tecnológicos, permitem que um grande potencial na conformidade da distribuição de dose. Este trabalho visa contribuir em um estudo dosimétrico, especificamente considerando os efeitos da heterogeneidade devido à presença de materiais tecido equivalentes com diferentes densidades e composições químicas, de modo a analisar qual destes parâmetros exerce maior influência na distribuição de dose longitudinal. A metodologia desenvolvida neste trabalho foi baseada em simulações de Monte Carlo com o código GEANT4 (através da interface TOPAS). Os objetos simuladores cilíndricos representados foram compostos inteiramente por diversos materiais tecido-equivalentes. Três grupos de estudo guiaram as simulações, o primeiro manteve a composição e densidade originais dos materiais, ao seguinte foi atribuída a todos os materiais heterogêneos a mesma densidade da água, mas mantiveram-se suas composições químicas originais; e por fim, foram realizadas simulações com as densidades originais dos materiais heterogêneos e composição química da água para todos os casos. Através da análise da distribuição de dose longitudinal variando com a profundidade, foi possível observar o comportamento da influência dos parâmetros de composição e densidade no alcance do feixe (d90) para os diferentes materiais e energias analisados. O estudo mostrou que, o efeito que a densidade dos materiais tecido equivalentes exerce sobre a deposição de dose é mais expressivo que o efeito de sua composição. A maior exatidão no range de tratamento permite evitar uma sub ou sobre dosagem da área irradiada. Esta é uma das diversas linhas de pesquisa que contribuem para a diminuição das incertezas em protonterapia.

    Palavras-Chave: radiotherapy; proton beams; radiation dose distributions; tissue-equivalent materials; monte carlo method; heterogeneous effects

  • IPEN-DOC 27940

    MAZER, AMANDA C. ; SHORTO, JULIAN M.B. ; SIQUEIRA, PAULO T.D. ; NAKANDAKARI, MARCOS V.N.; RIBEIRO, VICTOR A.B.; YORIYAZ, HELIO . Análise da sensibilidade do ArcCHECK® / ArcCHECK® sensitivity analysis. In: CONGRESSO BRASILEIRO DE FÍSICA MÉDICA, 24., 21-24 de agosto, 2019, Santos, SP. Anais... São Paulo, SP: Associação Brasileira de Física Médica, 2019. p. 1-5.

    Abstract: Este artigo apresenta uma análise da sensibilidade do sistema dosimétrico ArcCHECK, através de comparações entre medidas experimentais envolvendo alguns tipos de deslocamentos mecânicos e medidas de uma referência fixa. O ArcCHECK é um sistema que contém 1386 diodos dispostos de forma helicoidal e que permite realizar medições para Controle de Qualidade de técnicas de radioterapia mais modernas e complexas. Foram feitas algumas medidas iniciais de repetibilidade e de linearidade e, em sequência, análises da capacidade do dispositivo em identificar erros de deslocamentos em diferentes direções, bem como a visualização de efeitos da resolução dos diodos. Foram encontradas diferenças consideráveis nos valores de dose entre deslocamentos pequenos e a referência. Também foram observadas deformações nas curvas de isodose para determinados ângulos de irradiação do sistema. O ArcCHECK foi considerado bastante sensível, dada a metodologia de análise, porém deve ser utilizado com cautela quando posicionado para realizar Controle de Qualidade.

    Palavras-Chave: dosimetry; equipment; irradiation; isodose curves; quality assurance; radiation dose distributions; radiotherapy

  • IPEN-DOC 27939

    AGODI, C.; CAPPUZZELLO, F.; ACOSTA, L.; AMADOR-VALENZUELA, P.; AUERBACH, N.; BAREA, J.; BELLONE, J.I.; BELMONT, D.; BIJKER, R.; BONANNO, D.; BORELLO-LEWIN, T.; BOZTOSUN, I.; BRANCHINA, V.; BRASOLIN, S.; BRISCHETTO, G.; BRUNASSO, O.; BURRELLO, S.; CALABRESE, S.; CALABRETTA, L.; CALVO, D.; CAPIROSSI, V.; CARBONE, D.; CAVALLARO, M.; CHEN, R.; CIRALDO, I.; CHAVEZ LOMELI, E.R.; COLONNA, M.; D’AGOSTINO, G.; DJAPO, H.; DE GERONIMO, G.; DELAUNAY, F.; DESHMUKH, N.; DE FARIA, P.N.; ESPEJEL, R.; FERRARESI, C.; FERREIRA, J.L.; FERRETTI, J.; FINOCCHIARO, P.; FIRAT, S.; FISICHELLA, M.; FLORES, A.; FOTI, A.; GALLO, G.; GARCIA-TECOCOATZI, H.; GONGORA, B.; HACISALIHOGLU, A.; HAZAR, S.; HUERTA, A.; KOTILA, J.; KUCUK, Y.; IAZZI, F.; LANZALONE, G.; LA VIA, F.; LAY, J.A.; LENSKE, H.; LINARES, R.; LONGHITANO, F.; LO PRESTI, D.; LUBIAN, J.; MA, J.; MARIN-LAMBARRI, D.; MARTINEZ, S.; MAS, J.; MEDINA, N.H.; MENDES, D.R.; MEREU, P.; MORALLES, M. ; OLIVEIRA, J.R.B.; ORDOÑEZ, C.; PAKOU, A.; PANDOLA, L.; PETRASCU, H.; PIETRALLA, N.; PINNA, F.; REITO, S.; REZA, G.; RIES, P.; RIFUGGIATO, D.; RODRIGUES, M.R.D.; RUSSO, A.D.; RUSSO, G.; SANDOVAL, S.; SANTOPINTO, E.; SANTOS, R.B.B.; SGOUROS, O.; SILVEIRA, M.A.G. da; SOLAKCI, S.O.; SOULIOTIS, G.; SOUKERAS, V.; SPATAFORA, A.; TORRESI, D.; TUDISCO, S.; VSEVOLODOVNA, R.I.M.; VARGAS, H.; VEGA, G.; WANG, J.S.; WERNER, V.; YANG, Y.Y.; YILDIRIN, A.; ZAGATTO, V.A.B.. New experimental campaign of NUMEN project. In: MARUYAMA, REINA (Ed.) SYMMETRIES AND ORDER: ALGEBRAIC METHODS IN MANY BODY SYSTEMS, October 5-6, 2018, Connecticut, USA. Proceedings... Melville, NY, USA: AIP Publishing, 2019. p. 30001-1 - 30001-6. (AIP Conference Proceedings, 2150). DOI: 10.1063/1.5124590

    Abstract: The NUMEN main goal is the extraction from measured cross-sections of “data-driven” information on Nuclear Matrix Elements for all the systems candidate for 0νββ. The idea is to use as experimental tool Heavy Ions –Double Charge Exchange (HI-DCE) reactions. Crucial for the experimental challanges is the INFN Laboratori Nazionali del Sud (LNS) facility, made by the Superconducting Cyclotron (CS) and the MAGNEX magnetic spectrometer. The experimental measurements of HI-DCE reactions present a number of challenging aspects, since they are characterized by very low cross sections. Here it is reported the new experimental campaign of NUMEN Project.

  • IPEN-DOC 27935

    SANTOS, THIAGO O. ; CARMO, AMANDA P. ; GONÇALVES, PEDRO N. ; DAMATTO, SANDRA R. . Determination of the natural radionuclides 226Ra, 228Ra and 210Pb activity concentrations in the mineral waters from the cities of Monte Alegre do Sul and Socorro, SP. In: INTERNATIONAL NUCLEAR ATLANTIC CONFERENCE, October 21-25, 2019, Santos, SP. Proceedings... Rio de Janeiro: Associação Brasileira de Energia Nuclear, 2019. p. 42-49.

    Abstract: The use of mineral water for medical treatment is widespread throughout the world, and several mineral water springs have considerable concentrations of natural radionuclides from the 238U and 232Th series. The estimate of probable adverse effects on human health that may occur because of the ingestion or inhalation of radioactive substances present in these waters is relevant in Radiological Protection. The objective of this study was to determine the activity concentrations of the radionuclides 226Ra, 228Ra and 210Pb in the mineral water springs of Monte Alegre do Sul and Socorro, cities of the Paulista Water Circuit, collected in the seasons of summer, autumn, winter and spring of 2018; these cities have several mineral water springs distributed in many parts of them. The activity concentrations for the mineral waters from Monte Alegre do Sul ranged for 226Ra from limit detection of 2.2 ± 0.2 mBq L-1 to 23.0 ± 0.2 mBq L-1 , from limit detection of 3.7 ± 0.1 mBq L-1 to 16.0 ± 0,8 mBq L-1 for 228Ra and for 210Pb from the limit detection of 4.9 ± 0.4 mBq L-1 to 58 ± 5 mBq L -1 ; for Socorro ranged from limit detection of 2.2 ± 0.2 mBq L-1 to 11.0 ± 0.9 mBq L-1 for 226Ra, from limit detection of 3.7 ± 0.1 mBq L-1 to 48 ± 3 mBq L-1 for 228Ra and for 210Pb from limit detection of 4.9 ± 0.4 mBq L-1 to 49 ± 4 mBq L -1 .

  • IPEN-DOC 27934

    CARMO, AMANDA P. ; SANTOS, THIAGO O. ; DAMATTO, SANDRA R. ; ULRICH, JOÃO C. . Assessment of Ra-226, Ra-228, Pb-210 and Po-210 activity concentrations and inorganic chemistry composition of the mineral waters of Amparo, SP. In: INTERNATIONAL NUCLEAR ATLANTIC CONFERENCE, October 21-25, 2019, Santos, SP. Proceedings... Rio de Janeiro: Associação Brasileira de Energia Nuclear, 2019. p. 28-41.

    Abstract: Significant concentrations of natural radionuclides dissolved can be found in mineral water springs, mainly radionuclides from the 238U and 232Th decay series that are used worldwide due to its therapeutic properties. The estimation of possible adverse effects on human health due to the ingestion or inhalation of radioactive substances present in these waters is a relevant factor in the context of Radiological Protection. The objective of this work was to evaluate the activity concentrations of the radionuclides 226Ra, 228Ra, 210Pb and 210Po in the mineral water springs of the city of Amparo in the seasons of summer, autumn, winter and spring of 2018 and the committed effective doses due to the consumption of these waters, and as well as, characterize its chemical composition. The city of Amparo has 11 springs distributed in many places of the city and belongs to the Paulista Water Circuit. The highest activity concentrations were obtained for the radionuclides 228Ra and 210Po and consequently the highest committed effective dose. Among the chemical elements analyzed, Al, Mn, and Pb presented the highest concentrations in all the mineral water springs.

  • IPEN-DOC 27933

    LEVY, DENISE S. ; SORDI, GIAN M.A.A. ; RODRIGUES, DEMERVAL L. ; CARNEIRO, JANETE C.G.G. . Communication about occupational exposure: linking workers to high-quality information. In: INTERNATIONAL NUCLEAR ATLANTIC CONFERENCE, October 21-25, 2019, Santos, SP. Proceedings... Rio de Janeiro: Associação Brasileira de Energia Nuclear, 2019. p. 18-27.

    Abstract: Brazil is the largest country of Latin America, with 8.5 million square kilometers divided into five regions with 3 time zones. In this large between-country distances, with plenty of radioactive facilities throughout the country, professional education and communication is a must and a challenge. This paper discusses a web-based project designed to provide effective communication about occupational exposure, linking geographically distant workers to high-quality reliable information. The web-based-project UNIPRORAD counts on concepts, definitions and theory about radiological protection based on both national and international standards, guidelines and recommendations. The content includes optimization, monitoring, potential exposure and communication on occupational risk agents in the workplace. Regarding potential exposures, it is essential to consider the concept of “risk” which, even among scientific community, seems to assume a great variety of meanings. Regarding risk agents in the workplace, it is necessary to discuss the identification and evaluation of the various risk agents (physical, chemical biological and ergonomic) addressing attention to their association to ionizing radiation. This article presentsthe authors' experience in the communication of radiological protection in Brazil, presenting global and specific issues on radiological protection, analyzing recommendations and discussing discrepancies among the several valid publications. It is our objective the dissemination of trustful updated communication, providing radioactive facilities relevant, accurate and understandable information. Finally, the article emphasizes the need to spread information wherever it is needed to inform as many people as possible, contributing to develop workers´ professional skills and to improve safety culture in workplace.

  • IPEN-DOC 27678

    CERAVOLO, FLÁVIO E. ; ROCHA, MARCELO da S. ; ANDRADE, DELVONEI . CFD simulation of isothermal upward two-phase flow in a vertical tube of annular section. In: BRAZILIAN CONGRESS OF THERMAL SCIENCES AND ENGINEERING, 18th, November 16-20, 2020, Online. Proceedings... Rio de Janeiro, RJ: Associação Brasileira de Engenharia e Ciências Mecânicas, 2020.

    Abstract: This work presents a simulation of a vertical, upward, isothermal two-phase flow of air bubbles and water in an annular channel applying a Computational Fluid Dynamics (CFD) code. The simulation considers an Eulerian frame, with a two-fluid model, specific correlations for turbulence modeling, and bubble-induced turbulence effects. The work intends to assess the accuracy of the code by comparing the simulation results with experimental data obtained from the literature. The annular channel has an equivalent hydraulic diameter of 19.1 mm, where the outer pipe has an internal diameter of 38.1 mm, the inner cylinder 19.1 mm, and a total length of 1900 mm. The void fraction distribution, taken radially to the flow section, is the main parameter analyzed besides interfacial area concentration (IAC), interfacial gas velocity, and bubble diameters distribution. The numerical models applied in this work demonstrate satisfactory agreement with the experimental data but indicate the need for further improvement in the phase interaction models.

  • IPEN-DOC 27620

    ABE, ALFREDO ; SILVA, ANTONIO T. e ; GIOVEDI, CLAUDIA; MELO, CAIO; GOMES, DANIEL de S. ; MUNIZ, RAFAEL R.. The IPEN/CNEN contribution to IAEA FUMAC benchmark using modified fuel performance code based on stainless steel as cladding under steady state, transient and accident conditions. In: TECHNICAL MEETING ON MODELLING OF FUEL BEHAVIOUR IN DESIGN BASIS ACCIDENTS AND DESIGN EXTENSION CONDITIONS, May 13-16, 2019, Shenzhen, China. Proceedings... Vienna, Austria: International Atomic Energy Agency, 2020. p. 1-9.

    Abstract: The IPEN/CNEN (Brazil) participated in IAEA Coordinated Research Project on Fuel Modeling in Accident Conditions (FUMAC) among others 18 countries (Argentina, Belgium, Bulgaria, China, Czech Republic, Finland, France, Germany, Hungary, Italy, Japan, Norway, Republic of Korea , Russian Federation , Spain , Sweden , Ukraine and United States of America), which aim was focused in modelling, predicting and improving the understanding of the behaviour of nuclear fuel under accident conditions in order to better understanding and enhanced safety of nuclear fuel. A serie of LOCA (Loss of Coolant Accident) experiments data were made available for the participants to perform simulation using their fuel performance codes and the outcome gives an idea about fuel codes limitation considering LOCA simulation and possible improvement needed in the existing models related to LOCA condition.The IPEN/CNEN (BRAZIL) proposal for FUMAC-CRP was to modify existing fuel performance codes (FRAPCON and FRAPTRAN) considering stainless steel as cladding material and perform a simulation comparing to zircaloy cladding performance under steady state and accident condition. The HALDEN LOCA Experiments (IFA 650-9, IFA-650-10 and IFA-650-11) were selected and modeled to perform the LOCA accident simulation considering the original cladding (zircaloy) and compared to stainless steel cladding.

  • IPEN-DOC 27616

    PERROTTA, J.A. ; CARVALHO, E.F.U. ; DURAZZO, M. ; SANTOS, L.R. dos ; BAPTISTA, J.A. ; SILVA, J.E.R. da ; JUNQUEIRA, F.C. ; SANTOS, ADIMIR dos ; ARAUJO, A.M.V. de; TOMAZELLI, I.. The RMB project: fuel cycle management. In: INTERNATIONAL CONFERENCE ON RESEARCH REACTORS: ADDRESSING CHALLENGES AND OPPORTUNITIES TO ENSURE EFFECTIVENESS AND SUSTAINABILITY, November 25-29, 2019, Buenos Aires, Argentina. Proceedings... Vienna, Austria: International Atomic Energy Agency, 2020.

    Abstract: The Brazilian Nuclear Energy Commission (CNEN) decided to construct a new research reactor, named RMB (Brazilian Multipurpose Reactor). It is a 30 MW open pool-type research reactor using low enriched uranium fuel, and several associated facilities and laboratories. To establish an infrastructure for producing fuel assemblies for RMB operation and uranium targets for Mo-99 production, the RMB technical secretary has developed a coordinated project for the fuel cycle management system, putting together the fuel technology actors in Brazil. The goals of this coordinated project were: (i) to have a centrifuge cascade enriching uranium up to 20 wt% with the capacity to supply RMB yearly needs; (ii) to upgraded the CNEN existing infrastructure to produce nuclear fuel assemblies and uranium targets for the RMB yearly needs; (iii) to produce a set of fuel assemblies for a real RMB mockup core at the IPEN/MB-01 Critical Facility of CNEN. The RMB project design incorporates structures, systems and components (SSC) for interim storage of spent fuels for the hole plant lifetime. This paper presents details of the coordinated project that gives support and sustainability to the RMB fuel cycle supply and the spent fuel SSC designed.

  • IPEN-DOC 27615

    PERROTTA, J.A. ; SOARES, A.J. ; LIM, M.L.; IBELLI, M.C.; BARRERA, M.; KOROCHINSKY, S.; GAMBETTA, M.. The RMB project: technical and management development status. In: INTERNATIONAL CONFERENCE ON RESEARCH REACTORS: ADDRESSING CHALLENGES AND OPPORTUNITIES TO ENSURE EFFECTIVENESS AND SUSTAINABILITY, November 25-29, 2019, Buenos Aires, Argentina. Proceedings... Vienna, Austria: International Atomic Energy Agency, 2020.

    Abstract: The Brazilian Nuclear Energy Commission (CNEN) decided to construct a new research reactor, named RMB (Brazilian Multipurpose Reactor). This reactor will be part of a new nuclear research center, to be built on a site about 100 kilometers from São Paulo city, in the southeast part of Brazil. It is a 30 MW open pool-type research reactor using low enriched uranium fuel, and several associated facilities and laboratories in order to produce radioisotopes for medical and industrial use; to use thermal and cold neutron beams in scientific and technological research; to perform neutron activation analysis; and to perform materials and fuel irradiation tests. This project started in September 2008 and is nowadays at the development stage before construction. This article presents updated information on the technical design and the safety features regarding the reactor and the overall installation. It also presents an update on the nowadays overall development status of the RMB project and lessons learned related to the complexity of the project management.

  • IPEN-DOC 27614

    BITELLI, U.D. ; COELHO, P.R.P. ; FERREIRA, P.S.B. ; ALVES, M.A.P.; SILVA, A.A. ; SANTOS, A. ; DINIZ, R. ; JEREZ, R. ; FUGA, R. ; FANARO, L.C.C.B. ; KURAMOTO, R. ; ABE, A. ; LAMBIASI, B. ; GIADA, M.; FER, N.; MARTINS, F. ; MURA, L. ; SANTOS, D.F. ; AREDES, V. ; MAEDA, R.; GONNELI, E. ; SILVA, A.F.P.; PURGATO, R. ; GONÇALVES, L.B. ; SILVA, G.S.A. ; PINTO, L. ; SOUZA, G.. Main experiments performed at the IPEN/MB-01 RR using UO2 fuel rods core. In: INTERNATIONAL CONFERENCE ON RESEARCH REACTORS: ADDRESSING CHALLENGES AND OPPORTUNITIES TO ENSURE EFFECTIVENESS AND SUSTAINABILITY, November 25-29, 2019, Buenos Aires, Argentina. Proceedings... Vienna, Austria: International Atomic Energy Agency, 2020.

    Abstract: This paper aims to show the main experimental utilization of the IPEN/MB-01 zero power reactor during the last 30 years with 3663 operations cycles. The IPEN/MB-01 reactor it was mainly used to validation of calculation methodology used in nuclear reactor cores design.

  • IPEN-DOC 27613

    PERROTTA, J.A. . Considerations and challenges of research reactor management. In: INTERNATIONAL CONFERENCE ON RESEARCH REACTORS: ADDRESSING CHALLENGES AND OPPORTUNITIES TO ENSURE EFFECTIVENESS AND SUSTAINABILITY, November 25-29, 2019, Buenos Aires, Argentina. Proceedings... Vienna, Austria: International Atomic Energy Agency, 2020.

    Abstract: Technically, nuclear reactors are equipment were neutron chain reactions of fissile material are safely controlled. Particularly, Research Reactors (RR) use the produced neutrons to a variety of objectives in science, technology, innovation, education, and direct products to society as, for example, the radioisotopes for nuclear medicine. Management is a fundamental aspect to the mission success of a RR and essential to its sustainability and effectiveness. As higher the neutron flux and the RR utilization, more complex are the management actions required to the installation, and their out-installation interfaces as well. Nevertheless, basic management requirements are still necessary to low neutron flux RR, for example, a critical facility. There are many important areas to be considered in RR management as organizational structure, operation, utilization, safety, fuel management, waste management, accessibility and security, human resources development, and financial resources among others. This paper resumes the author invited oral presentation that covers relevant aspects of RR management. Examples are given, based on the author’s experience, related to RRs fulfilling their planned missions and, particularly, related to the development and installation of a new RR project.

  • IPEN-DOC 27612

    GENEZINI, F.A. ; FERNANDES, A.J. ; ZAHN, G.S. . The IEA-R1 62 years of operation: experiences and lessons learned. In: INTERNATIONAL CONFERENCE ON RESEARCH REACTORS: ADDRESSING CHALLENGES AND OPPORTUNITIES TO ENSURE EFFECTIVENESS AND SUSTAINABILITY, November 25-29, 2019, Buenos Aires, Argentina. Proceedings... Vienna, Austria: International Atomic Energy Agency, 2020.

    Abstract: Early in 1956, the Atomic Energy Institute (IEA, from the acronym in portuguese) was founded with the aim of installing the nuclear research reactor purchased from the American company Babcock & Wilcox in the framework of the “Atoms for Peace” program. The start-up was on September 16, 1957, where the first criticality in the Southern hemisphere was achieved. The IEA-R1 is a pool type, light water cooled and moderated, beryllium and graphite reflected research reactor. Although designed to operate continuously at up to 5 MW, it operated at 2 MW for 40 years and only rather recently started operating at 5 MW. This year IEA-R1 completed 62 years of operation. The reactor is the core of the Nuclear and Energy Research Institute – IPEN (former IEA) – with its laboratories working for radiopharmaceutical applications, in the areas of radiological protection, nuclear fuel cycle, nuclear engineering, and radiation applications among others. Throughout this period it underwent several reforms, renovations and changes of management. In 2000 an Integrated Management System (IMS) has been structured, based on ISO-9001, in order to keep the operation safe, which implied certain procedures together with a continuous modernization program, and to comply with the regulatory requirements at the date as well. The first certification dates to 2002 and since then the reactor has been successfully renewing its ISO certification. The history, experiences and lessons learned during the 62 years of the IEA-R1 operation are described and shared in this paper.

  • IPEN-DOC 27611

    DINIZ, RAPHAEL E. ; OLIVEIRA, ALDO R. de ; TERRA, ADRIANA C. ; POTIENS, MARIA da P.A. . Avaliação do desempenho do sistema de referência para a calibração de medidores de radiação. In: CONGRESSO DE QUALIDADE EM METROLOGIA, LABORATÓRIOS E INDÚSTRIA, 17., 30 de novembro - 2 de dezembro, 2020, Online. Anais... São Paulo, SP: Rede Metrológica do Estado de São Paulo, 2020. p. 1-7.

    Abstract: O Laboratório de Calibração do Instituto de Pesquisas Energéticas e Nucleares, LCI, atua a mais de 30 anos calibrando instrumentos medidores de radiação aplicados em procedimentos de proteção radiológica, radioterapia e radiodiagnóstico, pertencentes a hospitais, indústrias, clínicas e outros usuários. No ano de 2002, foi estabelecido um Sistema da Qualidade no LCI que desde então tem passado por auditorias internas anualmente. No ano de 2017 o laboratório conseguiu alcançar a acreditação de acordo com a norma ISO 17025 para o escopo “calibração de instrumentos de medição em proteção radiológica: medidor de taxa e de equivalente de dose ambiente”. O sistema utilizado como referência para estas calibrações é composto por uma câmara de ionização esférica marca PTW, com volume de 1L, acoplada a um eletrômetro PTW, modelo UNIDOS. Este sistema tem passado por calibrações periódicas com rastreabilidade ao Laboratório Nacional de Metrologia das Radiações Ionizantes. Para garantir um bom desempenho nas medicões realizadas com este sistema, foi implantado um programa de controle de qualidade com testes de repetibilidade, corrente de fuga e estabilidade ao longo do tempo. Foi utilizada uma fonte de controle de Sr-90 também da PTW. Neste trabalho é demonstrado o desempenho dos sistema de referência ao longo de 18 anos. Foram realizados em torno de 100 testes de controle de qualidade. Os resultados obtidos foram comparados com o gráfico histórico de estabilidade do sistema. É permitida uma variação de até 2% do valor de referência determinado anteriormente.

  • IPEN-DOC 27610

    SARAU, SARA T. ; RODRIGUES JUNIOR, ORLANDO ; POTIENS, MARIA da P.A. . Instrução Normativa n° 54 da ANVISA e a importância dos testes de aceitação e controle de qualidade em serviços mamográficos. In: CONGRESSO BRASILEIRO DE METROLOGIA DAS RADIAÇÕES IONIZANTES, 7., 23-25 de novembro, 2020, Online. Anais... Rio de Janeiro, RJ: Sociedade Brasileira de Metrologia, 2020. p. 1-12.

    Abstract: Considerando que em 26 de dezembro de 2019 a ANVISA publicou a RDC n° 330 para serviços de radiologia diagnóstica e intervencionista e a Instrução Normativa n° 54 para sistemas de mamografia, neste trabalho realizou-se uma análise do estabelecido para testes de dosimetria da mama e de camada semi-redutora e um estudo comparativo de valores obtidos em quatro mamógrafos digitais direto publicados na literatura e os valores de referência e de tolerância apresentados na IN-54. Os resultados reforçam a importância da elaboração de um programa de controle de qualidade e da análise conjunta dos resultados obtidos em todos os testes.

  • IPEN-DOC 27609

    XAVIER FILHO, JOEL M. ; SILVEIRA, IURY S. ; CALDAS, LINDA V.E. . Espectros de feixes padrões de radiação X nas qualidades de radiodiagnóstico e mamografia a partir de simulações Monte Carlo. In: CONGRESSO BRASILEIRO DE METROLOGIA DAS RADIAÇÕES IONIZANTES, 7., 23-25 de novembro, 2020, Online. Anais... Rio de Janeiro, RJ: Sociedade Brasileira de Metrologia, 2020. p. 1-9.

    Abstract: Foram simulados os seis feixes RQR 5, 8, M1, M2, M3 e M4 descritos na norma TRS-457 (IAEA) utilizando o código de Monte Carlo EGSnrc. Foram realizadas simulações computacionais de um tubo de raios X para a obtenção de seus espectros utilizando o software BEAMnrc. As curvas de atenuação para cada espectro foram obtidas com o aplicativo egs_kerma. Por meio das 1ª e 2ª camadas semi-redutoras, dos coeficientes de homogeneidade e das energias médias foi possível determinar a qualidade de cada um dos feixes simulados. Todos os parâmetros de qualidade foram próximos aos estabelecidos na norma TRS-457 (IAEA).

  • IPEN-DOC 27550

    ALMEIDA, JORGE V. de; SILVA, EDUARDO C. da; MOSSO, MARBEY M.; SARTORI, CARLOS A.F. . Virtual magnetic TL-based channel modeling of SWIPT systems assisted by MTMs. In: MATOS, LENI J. de (Ed.) SIMPÓSIO BRASILEIRO DE MICRO-ONDAS E OPTOELETRÔNICA, 19.; CONGRESSO BRASILEIRO DE ELETROMAGNETISMO, 14., 8-12 de novembro, 2020, Online. Anais... São Caetano do Sul, SP: SBMO, 2020. p. 674-678.

    Abstract: This paper describes a general methodology for the description of inductive power and data transfer based on virtual magnetic transmission-lines (VMGTLs). This approach presents a better physical insight on the channel behavior since the model correctly preserves the energy flow between the transmitting and receiving coils. Particularly, the virtual-TL analogy clarifies the mechanism of transmission gain improvement between any two coils assisted by MTM lenses. Based on the results of this work, these lenses do not enhance the magnetic coupling between the drivers, as usually claimed, but create conditions to propagating near-field modes to increase their power transfer. This approach also reveals that MTMs could be employed not only for the increasing of power transfer but also for enlarging the inductive channel bandwidth.

  • IPEN-DOC 27549

    SANTOS, DANIEL de P. dos; SARTORI, CARLOS A.F. . Análise comparativa de métodos ativos de redução de sobretensão em motores por superposição de pulsos. In: MATOS, LENI J. de (Ed.) SIMPÓSIO BRASILEIRO DE MICRO-ONDAS E OPTOELETRÔNICA, 19.; CONGRESSO BRASILEIRO DE ELETROMAGNETISMO, 14., 8-12 de novembro, 2020, Online. Anais... São Caetano do Sul, SP: SBMO, 2020. p. 791-795.

    Abstract: Sobretensão em motores elétricos acionados por conversores estáticos de frequência representam grande risco à integridade do equipamento e se intensificam à medida que tais conversores aperfeiçoam sua velocidade de chaveamento. Os métodos ativos de redução de sobretensão por superposição de pulsos se utilizam dos próprios conversores de frequência para suprimir ou minimizar os pulsos refletidos através do cabo de acionamento do motor, que geram a sobretensão. Esse artigo explora alguns desses métodos em termos de eficácia, flexibilidade e robustez e faz uma análise comparativa destes. Também são realizadas comparações entre sistemas de acionamento dotados de IGBTs de silício e de MOSFETs de carbeto de silício.

  • IPEN-DOC 27538

    GUANABARA JUNIOR, PAULO; NOGUEIRA, ALESSANDRO F.; SAMAD, RICARDO E. ; ROSSI, WAGNER de . Study of ablation on surfaces of zircaloy Z-4 irradiated with femtosecond laser. In: INTERNATIONAL CONGRESS OF MECHANICAL ENGINEERING, 25th, October 20-25, 2019, Uberlândia, MG. Proceedings... Rio de Janeiro, RJ: Associação Brasileira de Engenharia e Ciências Mecânicas, 2019.

    Abstract: The use of ultrashort femtosecond laser pulses is an alternative for micro machining on metal surfaces, with several industrial applications, in such areas as aeronautics, aerospace, naval, nuclear, among others, where there is growing concern about service reliability. Thus, markings for traceability purposes should ensure the integrity of the metal as well as allow reading of the marked characters, whether automated or not. In this work, micro machining of zircaloy Z 4 surfaces using femtosecond laser was performed aiming at the knowledge of the ablation threshold and Scanning Electron Microscopy (SEM) analysis in different images. Obtained from micro machined traces, energy fluence parameters and laser pulse overlap. The amount of ablated material in this femtosecond laser micro machining is negligible, which contributes to ensuring that there is no mi crostructural damage. Such a process resulted in different images, which characterize that there are different optical properties because of the parameters change.

    Palavras-Chave: machining; ablation; zircaloy 4; lasers

  • IPEN-DOC 25553

    PIERETTI, EURICO F. ; ANTUNES, RENATO A.; NEVES, MAURICIO D.M. das . Tribological evaluation of an optical fiber laser marked stainless steel for biomedical applications. In: CONGRESSO BRASILEIRO DE ENGENHARIA BIOMEDICA, 26., 21-25 de outubro, 2018, Búzios, RJ. Anais... 2018. p. 1-6.

    Abstract: The effect of laser marking process on the tribological behaviour of ISO 5832-1 austenitic stainless steel (SS) on the friction coefficient and wear volume using ball-cratering wear tests was evaluated in this work. The laser marking process was carried out with a nanosecond optical fiber ytterbium laser at four different pulse frequencies. For comparison reasons, surfaces without laser treatments were also evaluated. A phosphate buffer solution (PBS) was used as lubricant. The wear tests were carried out during 10 min with PBS drip, solid spheres of AISI 316L SS with 1 inch in diameter and of 52-100 chrome steel, with 2 mm in diameter, were used as counter-bodies. The results indicated that the tribological behaviour is influenced by the laser marking process parameters used, and the wear rate is dependent of the normal force and the type of sphere.

  • IPEN-DOC 27536

    GONÇALVES, MARIA C.C.; MERGULHAO, MARCELLO V. ; STOETERAU, RODRIGO L.; BATALHA, GILMAR F.; NEVES, MAURICIO D.M. . Análise de amostras da liga de titânio Ti6Al4V impressas por FSL para ensaios de microfresamento / Selective Laser Melting printed Ti6Al4V titanium alloy samples analysis for micro milling tests. In: INTERNATIONAL FORGING CONFERENCE, 23rd; NATIONAL SHEET METAL FORMING CONFERENCE, 22nd; INTERNATIONAL SHEET METAL FORMING CONFERENCE, 9th; BRDDRG CONGRESS, 6th; INTERNATIONAL CONFERENCE ON MATERIALS AND PROCESSES FOR RENEWABLE ENERGIES, 9th; INTERNATIONAL CONFERENCE ON SURFACE ENGINEERING IN MATERIAL FORMING, 2nd, October 2-4, 2019, Porto Alegre, RS. Proceedings... 2019.

    Abstract: A fabricação de peças metálicas via impressão 3D tem ganhado destaque pela sua eficácia na manufatura de geometrias complexas e com pouco consumo de material. Uma das estratégias de sinterização utilizadas para impressão 3D é a Fusão Seletiva a Laser (FSL), que consiste na completa fusão dos pós metálicos por meio de um feixe laser. As peças obtidas por esse processo apresentam uma superfície com ondulações periódicas e anisotropias relacionadas à direção da sinterização. No entanto, o efeito dessa ondulação e da anisotropia das peças nas suas propriedades mecânicas e na sua usinabilidade é pouco conhecido. Visto isso, este trabalho visa examinar amostras da liga de titânio Ti6Al4V impressas por FSL, mediante análises de dureza, rugosidade e por microscópio óptico para ensaios de microfresamento.

    Palavras-Chave: titanium alloys; hybrid systems; manufacturing; 3d printing

  • IPEN-DOC 27470

    KIBRIT, E. ; AQUINO, A.R. . Sustainability management system model for operating organisations of nuclear research reactors. In: EUROPEAN RESEARCH REACTOR CONFERENCE, October 12-15, 2020, Online. Proceedings... Brussels, Belgium: European Nuclear Society, 2020.

    Abstract: United Nations’ 2030 Agenda for Sustainable Development establishes 17 Sustainable Development Goals (SDGs). Nuclear and isotopic techniques contribute directly to achieving the SDGs related to energy, human health, food production, water management and environmental protection. This paper proposes a sustainability management system model for operating organisations of nuclear research reactors, supported by four sustainability pillars: institutional, economic, environmental and social. Each pillar of sustainability is formed by categories of indicators found in bibliographic references and validated by nuclear and sustainability academic experts, by using Delphi method. The management system model proposed has a high-level structure based on standards established by International Organisation for Standardization (ISO), considers safety requirements of International Atomic Energy Agency (IAEA) and corporate sustainability requirements found in bibliographic references. Stakeholders’ requirements and expectations are inputs of the management system. The focus of the management system is nuclear safety and the organisation's commitment to sustainable development. A method for validating the sustainability management system, a sustainable development matrix to assess the maturity of sustainability management over time, and a sustainable value model, which evaluates the path taken by the organisation towards sustainable development, are tools that support the management system proposed. The management system outputs are management decisions that comply with organisation's policy, objectives and processes; products that meet stakeholders' requirements and expectations; and a Sustainability Report that contains sustainability indicators addressed by institutional, economic, environmental and social dimensions.

    Palavras-Chave: information systems; sustainability; management; standardization; iso; safety standards; nuclear facilities

  • IPEN-DOC 27467

    NEVES, R.A.L.; GATTI, L.V. ; BASSO, L.S.; MARANI, L.; CRISPIM, S.P.; CORREIA, C.S.C. ; DOMINGUES, L.G. ; PAUL, D.; SCHEEREN, B.; ADNEW, G.; ROCKMANN, T.; PETERS, W.. Measuring stables isotopes of CO2 (13C and 17,18O) in vertical profiles over the Amazon. In: CROTWELL, ANDREW (Ed.); LEE, HAEYOUNG (Ed.); STEINBACHER, MARTIN (Ed.) WMO/IAEA MEETING ON CARBON DIOXIDE, OTHER GREENHOUSE GASES AND RELATED MEASUREMENT TECHNIQUES, 20th, September 2-5, 2019, Jeju Island, South Korea. Proceedings... Geneva, Switzerland: World Meteorological Organization, 2020. p. 129-132. (GAW Report 255).

    Palavras-Chave: carbon; emission; greenhouse gases; greenhouse effect; carbon dioxide

  • IPEN-DOC 27466

    MARANI, L.; BORGES, V.F. ; GATTI, L.V. ; DOMINGUES, L.G. ; CORREIA, C.S.C. ; BASSO, L.S.; SANTOS, R.S. dos ; CRISPIM, S.P.; NEVES, R.A.L.; GLOOR, M.; MILLER, J.B.. Background concentrations of CO2, CO and N2O in Brazilian coast. In: CROTWELL, ANDREW (Ed.); LEE, HAEYOUNG (Ed.); STEINBACHER, MARTIN (Ed.) WMO/IAEA MEETING ON CARBON DIOXIDE, OTHER GREENHOUSE GASES AND RELATED MEASUREMENT TECHNIQUES, 20th, September 2-5, 2019, Jeju Island, South Korea. Proceedings... Geneva, Switzerland: World Meteorological Organization, 2020. p. 125-128. (GAW Report 255).

    Palavras-Chave: carbon oxides; carbon dioxide; nitrous oxide; greenhouse gases; forests; ecological concentration; monitoring

  • IPEN-DOC 27465

    GATTI, L.V. ; MILLER, J.B.; GLOOR, M.; DOMINGUES, L.G. ; CORREIA, C.S.C. ; BASSO, L.; MARANI, L.; CASSOL, H.L.G.; TEJADA, G.; BORGES, V.F. ; PETERS, W.; CRISPIM, S.P.; LOPES, R.; RIBEIRO, M.M.; MORAIS, C.S.; AQUINO, C.A.B.. Measurement program of GHG vertical profiles at Amazon. In: CROTWELL, ANDREW (Ed.); LEE, HAEYOUNG (Ed.); STEINBACHER, MARTIN (Ed.) WMO/IAEA MEETING ON CARBON DIOXIDE, OTHER GREENHOUSE GASES AND RELATED MEASUREMENT TECHNIQUES, 20th, September 2-5, 2019, Jeju Island, South Korea. Proceedings... Geneva, Switzerland: World Meteorological Organization, 2020. p. 111-115. (GAW Report 255).

    Palavras-Chave: environment; environmental impacts; greenhouse gases; fires; forests; carbon sources; deforestation

  • IPEN-DOC 27464

    BASSO, L.S.; SANTOS, R.S.; BORGES, V.F. ; GATTI, L.V. ; DOMINGUES, L.G. ; CORREIA, C.S.C. ; MARANI, L.; CRISPIM, S.P.; NEVES, R.A.L.; GLOOR, M.; MILLER, J.B.. Study of long term SF6 mole fractions in Amazon and Brazilian coast. In: CROTWELL, ANDREW (Ed.); LEE, HAEYOUNG (Ed.); STEINBACHER, MARTIN (Ed.) WMO/IAEA MEETING ON CARBON DIOXIDE, OTHER GREENHOUSE GASES AND RELATED MEASUREMENT TECHNIQUES, 20th, September 2-5, 2019, Jeju Island, South Korea. Proceedings... Geneva, Switzerland: World Meteorological Organization, 2020. p. 107-110. (GAW Report 255).

    Palavras-Chave: sulfur fluorides; surfaces; greenhouse gases; coastal regions; concentration; greenhouse effect

  • IPEN-DOC 27463

    BASSO, L.S.; BORGES, V.F. ; GATTI, L.V. ; MARANI, L.; MORAIS, C.S.; CORREIA, C.S.C. ; DOMINGUES, L.G. ; NEVES, R.A.L.; CRISPIM, S.P.; GLOOR, M.; MILLER, J.B.. Long term CH4 measurements in Amazon and Brazilian coast. In: CROTWELL, ANDREW (Ed.); LEE, HAEYOUNG (Ed.); STEINBACHER, MARTIN (Ed.) WMO/IAEA MEETING ON CARBON DIOXIDE, OTHER GREENHOUSE GASES AND RELATED MEASUREMENT TECHNIQUES, 20th, September 2-5, 2019, Jeju Island. Proceedings... Geneva, Switzerland: World Meteorological Organization, 2020. p. 103-106. (GAW Report 255).

    Palavras-Chave: methane; methane; satellite atmospheres; greenhouse gases; greenhouse effect; air pollution monitoring

  • IPEN-DOC 27462

    TEJADA, GRACIELA; GATTI, LUCIANA ; BASSO, LUANA; DOMINGUES, LUCAS G. ; CASSOL, HENRIQUE; CORREIA, CAIO S.C. . CO2 atmospheric measurements and land use and cover change in the Brazilian Amazon. In: ENCONTRO ACADÊMICO DA ENGENHARIA AMBIENTAL DA EEL-USP, 3., 3-4 de junho, 2019, Lorena, SP. Anais... Lorena, SP: Escola de Engenharia de Lorena - USP, 2019.

    Palavras-Chave: carbon dioxide; deforestation; environmental impacts; greenhouse gases

  • IPEN-DOC 27461

    RIBEIRO, MAISA M.; GATTI, LUCIANA V. ; BASSO, LUANA S.; FISCH, GILBERTO; NEVES, RAIANE A.L.; CRISPIM, STEPHANE P.. Estudo da altura da camada limite planetária na região sudeste da Floresta Amazônica. In: ENCONTRO ACADÊMICO DA ENGENHARIA AMBIENTAL DA EEL-USP, 3., 3-4 de junho, 2019, Lorena, SP. Anais... Lorena, SP: Escola de Engenharia de Lorena - USP, 2019.

    Palavras-Chave: planetary atmospheres; air pollution monitoring; climate models; convective instabilities; meteorology

  • IPEN-DOC 27460

    NEVES, RAIANE A.L.; GATTI, LUCIANA V. ; CRISPIM, STEPHANE P.; RIBEIRO, MAISA M.; MARANI, LUCIANO; CORREIA, CAIO S.C. . Desenvolvimento de metodologia analítica para análise de isótopos de carbono em amostras de ar da Amazônia. In: ENCONTRO ACADÊMICO DA ENGENHARIA AMBIENTAL DA EEL-USP, 3., 3-4 de junho, 2019, Lorena, SP. Anais... Lorena, SP: Escola de Engenharia de Lorena - USP, 2019.

    Palavras-Chave: atmospheric circulation; greenhouse effect; climatic change; carbon dioxide; ecological concentration; carbon isotopes

  • IPEN-DOC 27459

    CRISPIM, STEPHANE P.; GATTI, LUCIANA V. ; BASSO, LUANA S.; SANTOS, RICARDO S. dos ; BORGES, VIVIANE F. ; NEVES, RAIANE A.L.. Estudo da concentração de hexafluoreto de enxofre (SF6) na costa norte e nordeste do Brasil. In: ENCONTRO ACADÊMICO DA ENGENHARIA AMBIENTAL DA EEL-USP, 3., 3-4 de junho, 2019, Lorena, SP. Anais... Lorena, SP: Escola de Engenharia de Lorena - USP, 2019.

    Palavras-Chave: sulfur fluorides; atmospheres; greenhouse effect; climatic change

  • IPEN-DOC 27458

    CORREIA, CAIO S.C. ; GATTI, LUCIANA V. ; RIBEIRO, MAISA M. ; NEVES, RAIANE A.L.; CRISPIM, STEPHANE P.; DOMINGUES, LUCAS G. . Medidas de óxido nitroso sobre a Bacia Amazônica com o uso de aviões de pequeno porte: um estudo de longo tempo. In: ENCONTRO ACADÊMICO DA ENGENHARIA AMBIENTAL DA EEL-USP, 3., 3-4 de junho, 2019, Lorena, SP. Anais... Lorena, SP: Escola de Engenharia de Lorena - USP, 2019.

    Palavras-Chave: nitrous oxide; greenhouse gases; mixing ratio; carbon dioxide; amazon river

  • IPEN-DOC 27457

    BASSO, LUANA S.; GATTI, LUCIANA V. ; MARANI, LUCIANO; DOMINGUES, LUCAS G. ; CRISPIM, STEPHANE P.; NEVES, RAIANE A.L.. Determinação das concentrações de CH4 na Amazônia Brasileira utilizando perfis verticais de avião. In: ENCONTRO ACADÊMICO DA ENGENHARIA AMBIENTAL DA EEL-USP, 3., 3-4 de junho, 2019, Lorena, SP. Anais... Lorena, SP: Escola de Engenharia de Lorena - USP, 2019.

    Palavras-Chave: methane; climatic change; greenhouse gases; ecological concentration; amazon river

  • IPEN-DOC 27456

    SANTIAGO, A.G.; CAMPOS, C.S.; MACEDO, M.M.G.; DAGUANO, J.K.M.B.; DERNOWSEK, J.A. ; RODAS, A.C.D.. Exploring different Convolutional Neural Networks architectures to identify cells in spheroids. In: BRAZILIAN CONGRESS IN BIOMEDICAL ENGINEERING, 27th, October 26-30, 2020, Vitória, ES. Proceedings... Rio de Janeiro, RJ: Sociedade Brasileira de Engenharia Biomédica, 2020. p. 2256-2260.

    Abstract: The cultivation of cells in 3D has gained more interest in research once 3D architecture can be closer to full cell physiological functionality. The cultivation of the cells in a spheroid format has shown very promising results, further for bioprinting developing so fast during the last decade. The interaction of spheroids and the matrix, or bioink, have proportionate new structures to be analyzed, specially if one would like to follow the whole system (spheroid and bioink) without fluorescent dyes. Trying to solve this image limitation, the aim of this paper is to present a study on different Convolutional Neural Networks (CNN) architectures employed to identify different structures in fibroblast NIH-3T3 spheroids. Three different architectures were considered: GoogleNet, ResNet18 and AlexNet, all implemented in Python 3.7 using the PyTorch Application Interface Programming (API). Given a spheroid image taken in a light microscope, four structures can be identified: the cell, the dead cell, the impurity/contamination and the background consisting of a gel in which the spheroid is immersed. All four CNN architectures were trained and evaluated with a dataset consisting of over 370 samples, split into a training set (≈ 70%), a test set (≈ 20%) and a validation set (≈ 10%). Since our dataset has unbalanced classes, a data augmentation was applied in order to provide a comparable number of samples for all classes being considered.

  • IPEN-DOC 27455

    PIERETTI, EURICO F. ; NEVES, MAURICIO D.M. das ; ANTUNES, RENATO A.. Corrosion analysis of a marked biomaterial. In: BRAZILIAN CONGRESS IN BIOMEDICAL ENGINEERING, 27th, October 26-30, 2020, Vitória, ES. Proceedings... Rio de Janeiro, RJ: Sociedade Brasileira de Engenharia Biomédica, 2020. p. 1968-1973.

    Abstract: Marking is one of the last steps of manufacturing an implantable biomaterial. The marks on its surface constitute a permanent set of information in order to provide identification and traceability of the biomedical device. These markings become stress concentrators and regions with probability for the occurrence of failures that can lead to fracture; besides damaging the passive layer, naturally formed on stainless steels surfaces, favoring the beginning of several forms of degradation. This work presents the effect of two metal implant marking techniques on the corrosion resistance of ISO 5832-1 austenitic stainless steel, one of the most used surgical biomaterials used in Brazil. Engraving was carried out with mechanical and laser beam marking techniques were prepared. The electrochemical behavior was characterized by cyclic potentiodynamic polarization curves and indicate that the laser marking technique is the one that most affects the passive layer of the material when compared to the mechanical engraving.

  • IPEN-DOC 27454

    NAMBA, A.F.; DEL-VALLE, M. ; DAGHASTANLI, N.A.; ANA, P.A.. In vitro study of the microstructural effects of photodynamic therapy in medical supplies when used for disinfection. In: BRAZILIAN CONGRESS IN BIOMEDICAL ENGINEERING, 27th, October 26-30, 2020, Vitória, ES. Proceedings... Rio de Janeiro, RJ: Sociedade Brasileira de Engenharia Biomédica, 2020. p. 1705-1710.

    Abstract: Cleaning and disinfecting surfaces and materials in health services are primary elements in infection control measures. For thermosensitive materials, the chemical agents used have disadvantages such as the odor of the products, which can cause allergic reactions to patients and the nursing staff. Photodynamic therapy (PDT) has been shown to be an effective technique in the treatment of infections caused by different microorganisms; however, nothing is known about the effects of this technique on the microstructure of hospital supplies. This in vitro study aimed to evaluate the effects of 0.2% peracetic acid, 1% sodium hypochlorite and PDT with 0.01% methylene blue on the composition and color changes of hospital masks and extensions. For this purpose, 100 mask samples and 100 extension samples were randomly distributed in 20 experimental groups (n = 10, 10 groups for each material), in which the applied substance was varied (sodium hypochlorite, peracetic acid and PDT) and the number of applications (without application, 1, 2 or 3 applications). The compositional analysis was performed by Fourier transform infrared spectroscopy, while the color changes were evaluated using image analysis by CIElab method evaluating the parameters L*, a*, b* and ∆E. The statistical analysis was performed at 5% significance level. It was observed that all agents altered the composition of the materials in a similar way. Although all agents promoted changes in different parameters evaluated, peracetic acid and methylene blue alone altered the final color perceived only in extensions. It was concluded that 0.2% peracetic acid, 1% sodium hypochlorite and PDT alter the chemical composition of both masks and extensions, and that such changes have a positive relationship with the number of treatments performed. These compositional changes may be related to the color changes promoted in both materials by all agents tested.

  • IPEN-DOC 27453

    FORJAZ, C.R.H.; ZEZELL, D.M. ; ANA, P.A.. Temperature generation and transmission in root dentin during Nd:YAG laser irradiation for preventive purposes. In: BRAZILIAN CONGRESS IN BIOMEDICAL ENGINEERING, 27th, October 26-30, 2020, Vitória, ES. Proceedings... Rio de Janeiro, RJ: Sociedade Brasileira de Engenharia Biomédica, 2020. p. 1031-1035.

    Abstract: High-intensity lasers are widely used in dental procedures and the heating produced on the surface is necessary to ensure protective activity against the development of caries and erosion lesions. However, caution should be exercised regarding the spread of heat to the pulp, periodontal tissue and alveolar bone, which can cause harm to these tissues. This study sought to evaluate the generation and transmission of heat in the root dentin and adjacent tissues during irradiation with Nd:YAG laser for preventive activity. For that, 15 lower incisor human teeth had an area of 9 mm2 of root dentin irradiated with Nd:YAG laser (λ=1.064 μm, 10 Hz, 60 mJ/pulse, 84.9 J/cm2) for 30s. During irradiations, pulpal temperature was evaluated by fast-response thermocouples, while surface temperature and heat distribution on surrounding tissues were measured by infrared thermography. It was observed a mean surface temperature increase of 293.48±30.6° C in root dentin surface, and 15.85 ± 39.6° C below the irradiated area, 11.72 ± 8.7° C above the irradiated area, 19.77 ± 4.9° C at 1 cm laterally and 7.03 ± 2.7° C at 2 cm laterally to the irradiated area. The mean pulpal temperature augment registered was 6.5±1.4° C. It can be concluded that Nd:YAG laser irradiation promoted surface temperature rises that suggest chemical changes on dentin; however, the temperature increases generated in the adjacent tissues (region of periodontal ligament) and in the pulp chamber may be dangerous in future clinical application considering the irradiation time of 30 s made in this study. Therefore, this laser protocol can be used as long as the irradiation time is reduced in future studies.

  • IPEN-DOC 27452

    CARVALHO, C.M.S.; MARINELI, A.G.F.; SANTOS, L. dos; FREITAS, A.Z. de ; AMARAL, M.M.. Evaluation of the Heart Rate Variability with Laser Speckle Imaging. In: BRAZILIAN CONGRESS IN BIOMEDICAL ENGINEERING, 27th, October 26-30, 2020, Vitória, ES. Proceedings... Rio de Janeiro, RJ: Sociedade Brasileira de Engenharia Biomédica, 2020. p. 430-433.

    Abstract: The Autonomic Nervous System (ANS) is responsible for regulating various physiological processes in the human body. The Heart Rate Variability (HRV) represents a measurement used in evaluating the modulation of the ANS in different physiological conditions such as stress, physical activity, sleep, metabolic alterations, and, also, pathological conditions. Physical activity results in important changes in the cardiovascular system, such as an increase in blood flow and a decrease of the peripheral vascular resistance. Monitoring the peripheral microcirculation represents an important aid in evaluating the general conditions of an individual. The Laser Speckle Contrast Analysis (LASCA) is a non-invasive optical resource developed that uses nonionizing radiation in the region of the infrared and is important in the diagnosis of problems regarding the peripheral microcirculation. This work aimed to implement a method to obtain the HRV through the peripheral microcirculation utilizing the Laser Speckle Contrast Analysis (LASCA) technique. A commercial LASCA equipment was used to obtain a face-video. A custom software was implemented to process the LASCA videos and obtain the HRV. A heart rate monitor (HRM) was also utilized to measure the HRV and the values were compared against the ones obtained with LASCA. The method had consistent results in obtaining both the pulsation and the HRV, making it possible for future studies to use such a technique.

  • IPEN-DOC 27348

    LEMOS, F.L. ; BIANCHI, P.H. . A systemic approach to information and cyber security. In: INTERNATIONAL CONFERENCE ON NUCLEAR SECURITY, February 10-14, 2020, Vienna, Austria. Proceedings... 2020. p. 1-6.

    Abstract: Design Based Threat, or DBT, is a common principle for physical and cyber protection, which is based on threat assessments. The protection, cyber or physical, will be planned based on the type of the identified threat. While we acknowledge the importance of the DBT, we argue that following this line of reasoning may limit our ability to grasp other vulnerabilities the system may have due to the following assumptions: a) The system will behave according to the way we think it should, based on a predetermined fashion. b) If each component of the system is reliable, then the system will be reliable. Systems theory assumes that accidents are a result of systemic factors, and does not have a single root-cause, generally a failure, that starts a chain of events leading to the accident. Moreover, systems theory assumes that security and safety are emergent properties of a system that result from the interactions between the components of that system. Therefore, accidents are a problem of control of the interactions between the components of the system rather than a problem of failures of components. In the systemic approach a cyber security system is treated as part of the whole socio-technical complex system, where humans are components of the system and interact with the computerized controls. The organizational culture permeates the entire system affecting decisions and, consequently, the interactions between the components. Weak safety and security cultures will eventually contribute for the system to migrate to hazardous states leading to losses or accidents. The paper analyzes the roles of organizational, safety and security cultures, as underlying factors that can lead to the deterioration of the hierarchical control structure, which is supposed to keep the interactions between the components of the system within desirable constraints.

  • IPEN-DOC 27339

    TESSARO, ANA P.G. ; ROLINDO, NATALIE C. ; MARUMO, JULIO T. ; VICENTE, ROBERTO ; LAS CASAS, ALEXANDRE . Use of ionizing radiation for treatment and extraction of organic compounds from petroleum sludge. In: ANNUAL WASTE MANAGEMENT CONFERENCE, 45th, March 3-7, 2019, Phoenix, Arizona, USA. Proceedings... Tempe, Arizona, USA: Waste Management Symposia, 2019. p. 1-7.

    Abstract: This paper presents preliminary results of a technical feasibility study of the use of an electron beam accelerator for the treatment of petroleum sludge and the degradation of organic and inorganic compounds. After analyzing the results of previous studies, the doses of the pilot study were defined.

  • IPEN-DOC 27338

    ROLINDO, NATALIE C. ; TESSARO, ANA P.G. ; SMITH, RICARDO B. ; CAMPOS, CESAR ; SAID, YASSER ; MARUMO, JULIO T. ; VICENTE, ROBERTO . Inventory and characterization of categories 3-5 disused sealed radioactive sources. In: ANNUAL WASTE MANAGEMENT CONFERENCE, 45th, March 3-7, 2019, Phoenix, Arizona, USA. Proceedings... Tempe, Arizona, USA: Waste Management Symposia, 2019. p. 1-10.

    Abstract: Brazil has one of the biggest inventories of SRS in the world, not only because of the large industrial park, the well-developed health care infrastructure and the numerous mining operations, but also by the use of radioactive sources in consumer products, such as smoke detectors, lightning arresters, surge protectors and even cardiac pacemakers. Presently, the inventory of DSRS at the WML is of more than 10,000; if the sources from lightning arresters, smoke detectors and Ir-192 with activities above the clearance levels are included, the estimate is over 150,000. The Waste Management Laboratory (WML) of the Nuclear and Energy Research Institute (IPEN/CNEN-SP) is responsible for the management and treatment of these sources. An important aspect to consider is that Brazil does not have a defined strategy or a protocol for screening and inventorying these sources, whose management was limited only to storage. The WML started the development of methods and operational work, to characterize and reduce the total volume of this inventory for the borehole-type final disposal facility yet to be constructed, where the DSRS will be disposed of. The information available from these sources is in a database created in 1980, when the sources began to be received. Several records on the FRSD that were checked are incomplete or simply incorrect, since there is no correspondence between the dates of entry of these sources in the storage and their physical characteristics. Some reasons can be listed to try to understand the divergences: the inspection when receiving the sources was not possible, no inspection procedure was defined, there were technical difficulties to open the packages. The objective of this work is to organize the inventory in a standardized way, control access, traceability, reduction of the necessary time to locate and characterize the sources upon reception, and of the repetitive work in the operational routine, and finally release of space in the storage.

  • IPEN-DOC 27337

    SMITH, RICARDO B. ; TESSARO, ANA P.G. ; ROLINDO, NATALIE C. ; VICENTE, ROBERTO . Further analyses of the unburied Goiania Accident packages. In: ANNUAL WASTE MANAGEMENT CONFERENCE, 45th, March 3-7, 2019, Phoenix, Arizona, USA. Proceedings... Tempe, Arizona, USA: Waste Management Symposia, 2019. p. 1-7.

    Abstract: In 1987, in the city of Goiania, Brazil, a derelict teletherapy machine was disassembled by scavengers and Cs-137 was released in the environment, unleashing the biggest radiological accident in Brazil. During the 15 days before the accident was acknowledged, some contaminated materials were sold and delivered to recycling factories in a few cities in the state of Sao Paulo, Brazil, in the form of metal scrap and recycled paper bales. The contaminated material was then collected, the metal scrap was conditioned in forty-three 200-liter drums, and the paper bales were stored in fifty 1.6 cubic meter steel boxes at the interim storage of the Nuclear and Energy Research Institute (IPEN), in the city of Sao Paulo, and there remained ever since. In 2017, 30 years later, initial analyses were performed at a sample of these boxes, checking for their activity, weight, and incongruences between the original values recorded at the time of collection and the measurement results 30 years later. The results indicated that none of the boxes checked were close to the clearance limit and that, without any sort of treatment, this radioactive waste should be stored for at least 150 years more. Visual inspection could not be performed at that time. Nowadays, some of the boxes were opened and samples from the contaminated material inside were taken for analysis. The main objective of this work is to report the results from the evaluation of the physical state of this material. After these analyses, the treatment options for volume reduction that were previously proposed were reviewed, and the method that best suits the current characteristics of the waste was chosen.

  • IPEN-DOC 27336

    SILVA, SIDNEY L. da; PRADO, FELIPE M.; TOFFOLI, DANIEL J.; WETTER, NIKLAUS U. . Measuring photoelastic dispersion coefficients in material samples with digital holography. In: BJELKHAGEN, HANS I. (Ed.) SPIE PHOTONICS WEST; SPIE OPTO, February 1-6, 2020, San Francisco, USA. Proceedings... Washington, USA: SPIE, 2020. p. 113060P-1 - 113060P-7. (Proceedings SPIE 11306, Practical Holography XXXIV: Displays, Materials, and Applications). DOI: 10.1117/12.2544874

    Abstract: Polarized Digital Holography (PHD) is a fast and efficient tool for analyzing mechanical effects in materials. Especially when the task requires non-invasive techniques that do not damage the material in study, the use of PHD has great perspectives. The most common methods of digital reconstruction use the convolution theory to discretize the Huygens- Fresnel integral. When external stresses are applied to photoelastic materials, the relationship between these stresses and phase differences observed by polarization holography is an intrinsic characteristic of the material called the photoelastic dispersion coefficient. In photoelasticity, this coefficient depends on the wavelength. By using PHD the authors show in the present paper that the photoelastic dispersion coefficient also depends on the wavelength in Holography. A Mach- Zehnder interferometer, modified with the inclusion of linear polarizers, was built to verify this effect in a sample of photoelastic material. In this set-up, two coherent light sources with different wavelengths were used. For the analysis, a digital method was created that correlated the mean stresses differences on the photoelastic material sample and the mean phases differences at each distinct wavelength.

  • IPEN-DOC 27335

    FREITAS, ANDERSON Z. de ; RIBEIRO, LUCAS A. de S. ; NEGRINI NETO, OSVALDO ; SARKIS, JORGE E.S. ; SIQUEIRA, ANDRESSA N. . Optical-coherence-tomography-based algorithm for handwriting forensic analysis. In: JALALI, BAHRAM (Ed.); KITAYAMA, KEN-ICHI (Ed.) SPIE PHOTONICS WEST; SPIE OPTO, February 1-6, 2020, San Francisco, USA. Proceedings... Washington, USA: SPIE, 2020. p. 112990P-1 - 112990P-8. (Proceedings SPIE 11299, AI and Optical Data Sciences). DOI: 10.1117/12.2543356

    Abstract: This work describes a new method for handwriting forensic analysis using optical coherence tomography (OCT) images. The region of interest (ROI) in documents signature to be analyzed were pre-selected with a traditional optical analyzer (Docucenter 2000 – Projectina®) equipped with different wavelengths light sources and bandpass filters coupled detector. The ROI where then submitted to OCT to 3D imaging (OCP930SR, Thorlabs Inc.) with optical resolution of 6.0 microns. One original and 5 falsified signatures were produced by 5 different individuals, using a block of 5 sheets of white sulfite paper A4 size and weight of 75 g/m^2, using the same blue ballpoint pen and in the same surface. For pressure pen calibration, were developed a system computer controlled to maintain the pressure constant during writing linear traces, 15 different pressure configuration were applied to each linear trace, resulting in a relation between deformation and applied pressure. An autonomous algorithm was developed to make surface detection, across OCT tomographic images, correct the paper surface curvature, detect and measure deformation on paper due to pen pressure, generating a new image in false color from differential pressure, based in previous calibration. This new image can be considered as a “fingerprint pressure” signature. This methodology may assist the forensic expert in correctly determining the authorship of a signature.

  • IPEN-DOC 27334

    DIPOLD, JESSICA ; SILVA, DANILO A.A. da ; BERECZKI, ALLAN ; JIMENEZ-VILLAR, E. ; WETTER, NIKLAUS U. . Polydispersed Nd3+:YVO4+SiO2 powders for highly efficient random lasers. In: JIANG, SHIBIN (Ed.); DIGONNET, MICHEL J.F. (Ed.) SPIE PHOTONICS WEST; SPIE OPTO, February 1-6, 2020, San Francisco, USA. Proceedings... Washington, USA: SPIE, 2020. p. 112760N-1 - 112760N-8. (Proceedings SPIE 11276, Optical Components andMaterials XVII). DOI: 10.1117/12.2545028

    Abstract: Random lasers are cheap and easy to fabricate, having several different applications such as early cancer detection, encryption and Speckle-free imaging. However, few fabricated random lasers present high efficiency, which limits their possible applications. In a recent work, our group achieved a record efficiency by developing random lasers that use compacted, polydispersed yttrium vanadate doped with neodymium (Nd3+:YVO4 ) powders to create separate regions for gain and light diffusion. Large particles are responsible for the light diffusion, while the small particles that occupy the spaces between them create gain pockets, absorbing the pumped light. In this work, this strategy is refined by using passive particles (SiO2) for light diffusion, restricting the laser active particles to the gain pockets. The first attempt with this strategy used 30% of Nd3+:YVO4 small powders and 70% of large SiO2 particles. Without any further optimization, the result achieved is already 40% of the highest obtained efficiency in the previously studied Nd3+:YVO4 polydisperse sample, showing a promising result to further improve this new strategy and reach even larger efficiencies with less laser active material.

  • IPEN-DOC 27333

    WETTER, NIKLAUS U. ; SILVA, DIEGO S. da ; KASSAB, LUCIANA R.P.; ROSSI, WAGNER de . Double line Neodymium doped GeO2-PbO waveguide amplifier for the second telecom window. In: JIANG, SHIBIN (Ed.); DIGONNET, MICHEL J.F. (Ed.) SPIE PHOTONICS WEST; SPIE OPTO, February 1-6, 2020, San Francisco, USA. Proceedings... Washington, USA: SPIE, 2020. p. 112760M-1 - 112760M-7. (Proceedings SPIE 11276, Optical Components and Materials XVII). DOI: 10.1117/12.2544291

    Abstract: We report the production of active double waveguides in germanate glasses, GeO2-PbO doped with Nd3+, by direct femtosecond laser writing. The glasses were produced using the melt-quenching technique and the active waveguides were written using 30 fs laser pulses at 800 nm with different parameters of writing speeds and pulse energies depending on the rare earth elements used for doping. The photo-induced refractive index change was 5.2x10-3. The Nd doped sample exhibited a relative gain of 3.6 dB/cm for 1.6 mW of 805 nm pump power. The results obtained in present work demonstrate that Nd3+ doped GeO2-PbO glasses are promising materials for the fabrication of integrated amplifiers, lossless components and lasers based on germanate glasses.

  • IPEN-DOC 27332

    BERECZKI, A. ; PAES, JOAO P.F. ; WETTER, NIKLAUS U. . Three-level Nd:YLF Raman laser directly pumped by a beam shaped diode bar. In: KUDRYASHOV, ALEXIS V. (Ed.); PAXTON, ALAN H. (Ed.); ILCHENKO, VLADIMIR S. (Ed.); ARMANI, ANDREA M. (Ed.) SPIE PHOTONICS WEST; SPIE LASE, February 1-6, 2020, San Francisco, USA. Proceedings... Washington, USA: SPIE, 2020. p. 1126614-1 - 1126614-8. (Proceedings SPIE 11266, Laser Resonators, Microresonators, and Beam Control XXII). DOI: 10.1117/12.2544844

    Abstract: Low heat generation can be obtained when pumping Nd:YLF at wavelengths of 872 nm and 880 nm and emitting at the three-level transition of 908 nm. These transitions show very low quantum defect with efficiencies of 0.96 and 0.97, respectively. However, the low average absorption cross-section at these wavelengths makes efficient absorption even for longitudinal pump setups difficult. Using a beam-shaped pump diode instead of a fiber-coupled diode bar may be an effective means of increasing absorption because it can provide for π-polarized radiation which shows higher absorption cross section. In this work, a Nd:YLF was pumped at 872 nm by a diode bar using beam-shaping. Results were compared to pumping at 872 and 880 nm with non-polarized fiber-coupled diodes. Stimulated Raman scattering was also obtained with a KGW crystal generating first Stokes emissions at 990 nm and 976 nm.

  • IPEN-DOC 27331

    BERECZKI, A. ; WETTER, NIKLAUS U. . Dynamically stable lasers from commercial Nd:YAG modules with high beam quality and single-frequency: the correct choice of the fundamental waist size at the rod. In: KUDRYASHOV, ALEXIS V. (Ed.); PAXTON, ALAN H. (Ed.); ILCHENKO, VLADIMIR S. (Ed.); ARMANI, ANDREA M. (Ed.) SPIE PHOTONICS WEST; SPIE LASE, February 1-6, 2020, San Francisco, USA. Proceedings... Washington, USA: SPIE, 2020. p. 1126617-1 - 1126617-10. (Proceedings SPIE 11266, Laser Resonators, Microresonators, and Beam Control XXII). DOI: 10.1117/12.2545005

    Abstract: Diode-side pump Nd:YAG rod modules are widely available, reliable and commercially very attractive for building continuous-wave solid-state lasers in the 10-1000 W range. Newer technologies such as fiber or thin disk lasers are generally much more expensive but have the benefit of better beam quality and higher output powers if necessary. By using well-known techniques for designing dynamically stable resonators (DSRs), lasers with high extraction efficiency and high beam quality (fundamental mode, TEM00) can be obtained also with diode side-pumped modules. However, a successful project for a dynamic stable laser depends critically on the correct choice of the fundamental mode diameter within the rod. DSR design rules are based on the beam waist, w3, at the rod principal planes by considering the rod as a thin thermal lens, which differs significantly from real resonators. Here we give guidelines and criteria on how to establish the correct diameter in each case. Using off-the-shelf 75 W Nd:YAG modules it was possible to obtain linearly polarized TEM00-mode output of 30 W with M2=1.08 from a single module, M2=1.2 and 76.5 W of output power using two modules and 100.5 W of polarized, continuous output with M2=1.8. A single-frequency ring laser was also built, using two modules, generating 51.6 W of fundamental wave single-frequency output.

  • IPEN-DOC 27330

    FERREIRA, MERILYN S. ; PASK, HELEN M.; WETTER, NIKLAUS U. . Nd:YLF/KGW intracavity Raman laser in DBMC configuration at 1147 and 1163 nm in TEM00. In: CLARKSON, W. ANDREW (Ed.); SHORI, RAMESH K. (Ed.) SPIE PHOTONICS WEST; SPIE LASE, February 1-6, 2020, San Francisco, USA. Proceedings... Washington, USA: SPIE, 2020. p. 112590K-1 - 112590K-7. (Proceedings SPIE 11259, Solid State Lasers XXIX: Technology and Devices). DOI: 10.1117/12.2545092

    Abstract: A Nd:YLF / KGW intracavity Raman laser in DBMC (double-beam-mode-controlling) configuration has been investigated in this work. The fundamental wavelength laser was generated using a Nd:YLF crystal pumped in DBMC configuration generating an emission wavelength of 1053 nm in σ-polarization. A VBG (volume-Bragg-grating) equipped diode emitting at 797 nm was used as pump source. The KGW crystal has two strong Raman lines, 768 cm-1 and 901 cm-1, generating two Raman wavelengths at 1147 nm and 1163 nm, respectively. The DBMC technique allows to produce TEM00 stable output in a side-pumped configuration with no requirement to introduce any additional mode selection technique, thus achieving high efficiency for fundamental TEM00 operation. The high power density of the fundamental laser combined with intracavity Stokes conversion produces an efficient Raman laser. Allying both techniques, the Nd:YLF in DBMC configuration and the intracavity Raman generation, it was possible to generate an output power at 1163 nm of 3.2 W corresponding to a diode-to-Raman conversion efficiency of 8% with slope efficiency of 8.8 %. For the emission at 1147 nm, 3.5 W of output power was achieved with a diode-to-Raman conversion efficiency of 11% and slope efficiency of 9%. The beam quality was M2 =1.9 and 1.1 in the horizontal and vertical direction, respectively. This is, to our knowledge, the first report of a side-pumped Nd:YLF/KGW intracavity Raman laser in DBMC configuration.

  • IPEN-DOC 27321

    MAZIERO, J.S. ; ROGERO, S.O. ; DAMASCENO, K.C. ; ORMENIO, M.B. ; CAVALCANTE, A.K. ; MARTINI, G.A. ; BATISTA, J.G.S. ; KATTI, K.V.; LUGAO, A.B. ; ROGERO, J.R. . Avaliação da toxicidade de nanopartículas de prata estabilizadas com goma arábica. In: WORKSHOP DE BIOMATERIAIS, ENGENHARIA DE TECIDOS E ORGÃOS ARTIFICIAIS, 6th, October 29-31, 2019, São Paulo, SP. Proceedings... 2019. p. 403-413.

    Abstract: As nanopartículas de prata (NPAg), devido a seus diversos atributos (formato variado, elevada área superficial e alto poder bactericida), vem sendo amplamente utilizadas em diversos setores da indústria. Esta utilização abrangente, tem provocado grande preocupação, quanto aos impactos e riscos potenciais que as NPAg podem causar ao meio ambiente e à saúde humana. Este trabalho teve como objetivo verificar a toxicidade de uma amostra de NPAg estabilizada com Goma Arábica e reduzida com Tri-Alanina, utilizando ensaios in vitro e in vivo. O teste in vitro de citotoxicidade, foi realizado seguindo a norma ISO 10993 - 5, em células da linhagem NCTC-L929; os ensaios in vivo de ecotoxicidade aguda, de acordo com a norma brasileira ABNT NBR 12713, utilizando como organismo teste a Daphnia similis; e embriotoxicidade aguda de acordo com o protocolo da OECD 236, utilizando como organismo teste o Danio rerio. Os resultados obtidos foram: IC50 de 2,61 mg L-1, CE50 de 6,55 μg L-1 e CL50 de 673 μg L-1. Os organismos aquáticos apresentaram maior sensibilidade às NPAg do que as células em cultura, elevando a importância de se realizar mais estudos em várias espécies de interesse biológico. Além disso, mostra-se necessário verificar o descarte apropriado dessas nanopartículas, visto que no Brasil ainda não há legislações que quantifiquem os limites permissíveis para esse descarte.

  • IPEN-DOC 27107

    PEREIRA, VIVIAM S.M.; ANTUNES, RENATO A.; OLIVEIRA, MARA C.L. de; CORREA, OLANDIR V. . Efeito de tratamentos de envelhecimento sobre a resistência à corrosão da liga de magnésio AZ91D / Ageing heat treatments effect on the corrosion resistance of the AZ91D magnesium alloy. In: CONGRESSO INTERNACIONAL ANUAL DA ABM, 67th, July 31 - August 7, 2012, Rio de Janeiro, RJ. Proceedings... 2012. p. 192-202.

    Abstract: O efeito de tratamentos térmicos de envelhecimento (T6) sobre a resistência à corrosão da liga de magnésio AZ91D foi estudado. Amostras solubilizadas a 445°C por 24 h foram envelhecidas a 200 °C por tempos de 8 h, 16 h e 24 h. Todos os tratamentos foram realizados em forno mufla, sob atmosfera inerte (argônio), seguidos de resfriamento em água. Para observação das alterações microestruturais, utilizaram-se as técnicas de microscopia óptica e de MEV. O comportamento eletroquímico foi avaliado por ensaios de espectroscopia de impedância eletroquímica e de polarização potenciodinâmica, utilizando-se solução de Hanks, a 37 °C como eletrólito. O período de imersão foi de 7 dias. Com o tratamento de solubilização, ocorreu a dissolução do constituinte eutético, restando somente a matriz (fase α-Mg) saturada com alumínio, juntamente de resquícios de β- Mg17Al12. Com o tratamento de envelhecimento foram observados precipitados ricos em alumínio (β-Mg17Al12) sobre a matriz. A amostra envelhecida por 8 h foi a que mostrou menor valor de resistência à corrosão; as amostras tratadas por 16 h e 24 h apresentaram valores de impedância semelhantes, sendo que a amostra envelhecida por 16 h apresentou o melhor desempenho.

  • IPEN-DOC 27083

    MARTINS, E.W. ; CARDOSO, J.V.; POTIENS, M.P.A. . Determination of computed tomography quantities using a new pediatric phantom. In: INTERNATIONAL CONFERENCE ON RADIATION PROTECTION IN MEDICINE: ACHIEVING CHANGE IN PRACTICE, December 11-15, 2017, Vienna, Austria. Proceedings... Vienna, Austria: International Atomic Energy Agency, 2018. p. 1-5.

    Abstract: A computed tomography pediatric head phantom that uses special materials to simulate the cortical and the cancellous bone was developed. This paper shows its behavior to determine the specific computed tomography radiation quantities at two calibration laboratory, the LCI-IPEN, Brazil and LMRI-IST, Portugal. The specific quantities measured were: air kerma index(Ca,100), weighted air kerma index (Cw), average volumetric air kerma index (Cvol) and the air kerma- lenght product (PKL). The reference radiation qualities used in both laboratories were the radiation qualities recommended by the norm IEC 61267 (RQT8, RQT9 e RQT10) to computed tomography dosimetry measurements. The calculated values of CW show attenuation of 11%, 13% and 10% for the qualities RQT 8, RQT 9 and RQT 10, respectively, from cortical to cancellous bone.

  • IPEN-DOC 27080

    GERALDO, BIANCA ; VICENTE, ROBERTO ; FERREIRA, ROBSON J. ; MADUAR, MARCELO F. ; GOES, MARCOS M. ; MARUMO, JULIO T. . Radiochemical method for characterization of the filter cartridges from the IEA-R1 reactor. In: ANNUAL WASTE MANAGEMENT CONFERENCE, March 6-10, 2016, Phoenix, Arizona, USA. Proceedings... Tempe, Arizona, USA: Waste Management Symposia, 2016. p. 1-5.

    Abstract: The filter cartridges used in water purification system of the IEA-R1 research reactor become radioactive waste after the end of their useful life. The characterization of this waste is one step in their management, which aims at identifying and quantifying the radionuclides present, including those known as "difficult to measure" (DTM) radionuclides. Wastes from nuclear reactors contain fission and activation products and transuranic elements, only few of them emitting gamma radiation measurable by simple gamma spectrometry methods. In routine waste management activities, the concentrations of the DTM can only be estimated by indirect methods such as scaling factors. The method of the scaling factors uses empirically determined proportions between the concentrations of DTM radionuclides and that of easily measurable gamma emitters called key nuclides (KN), to calculate DTM concentrations. Determining the scaling factors for the filter cartridges is a hard task when the number of samples is large, not only because the preparation of samples is difficult but also because the number of radionuclides to analyze is large. If it can be demonstrated that DTM and KN are both distributed evenly in the filters, less samples from each filter are necessary, reducing lab work. The aim of this paper is to present the results of the assessment of homogeneity along the filter cartridges by gamma spectrometry of chemically reduced samples. Five thin slices of five filters were burnt and the ashes quantitatively dissolved and the activity concentration of the solutions determined by gamma spectrometry.

  • IPEN-DOC 27079

    FERREIRA, EDUARDO ; VICENTE, ROBERTO ; TURRILLAS, XABIER; YOKAICHIYA, FABIANO; FRANCO, MARGARETH ; MARTINEZ, LUIS G. ; CARVALHO, ALEXANDRE; MARUMO, JULIO T. . Effects of gamma radiation on cementitious materials in repository environment. In: ANNUAL WASTE MANAGEMENT CONFERENCE, March 6-10, 2016, Phoenix, Arizona, USA. Proceedings... Tempe, Arizona, USA: Waste Management Symposia, 2016. p. 1-10.

    Abstract: Cementitious materials are widely used in the management of radioactive waste and have to perform as required for the period of service life of the installation. In order to assess the long term durability of cement paste in a deep borehole for radioactive wastes, specimens were casted in laboratory and exposed to a gamma radiation field. The effects of the radiation in the specimens were evaluated by X-Ray Diffraction, as changes observed in the mineralogy and microstructure of the material after irradiation doses varying between 0 (without radiation) and 10 MGy. It was observed that the specimens exposed to higher doses of gamma radiation (up to 3MGy) presented differences between surface and core, when compared with the samples with no radiation or exposed to low doses. These results are important to model the behavior of cementitious materials under the conditions expected in a borehole repository and to provide data for the safety assessment of the installation.

  • IPEN-DOC 27071

    FERREIRA, E.S.; BENETTI, C.; ZEZELL, D.M. ; KATO, I.T.; ANA, P.A.. Efeitos da irradiação com laser de Er,Cr:YSGG na temperatura pulpar e superficial da dentina radicular. In: VIEIRA NETO, HUGO (Ed.); SOARES, ALCIMAR B. (Ed.); FÉLIX, RODRIGO P.B. da C. (Ed.); VIEIRA NETO, HUGO (Org.); MAIA, JOAQUIM M. (Org.); PICHORIM, SÉRGIO F. (Org.); GAMBA, HUMBERTO R. (Org.); COSTA, EDUARDO T. (Org.) CONGRESSO BRASILEIRO DE ENGENHARIA BIOMÉDICA, 25., 17-20 de outubro, 2016, Foz do Iguaçu, PR. Anais... Rio de Janeiro, RJ: Sociedade Brasileira de Engenharia Biomédica, 2016. p. 1937-1940.

    Abstract: Tendo em vista o envelhecimento da população e a permanência dos dentes na cavidade oral, observou-se um aumento da incidência da cárie radicular em idosos. Os lasers de érbio podem ser usados para prevenção de cárie; contudo, ainda não são estabelecidos parâmetros de irradiação que sejam seguros para os tecidos pulpares e periodontais e que sejam efetivos para ocasionar alterações químicas na superfície da dentina. Este estudo avaliou os efeitos da irradiação da dentina radicular com laserde Er,Cr:YSGG na temperatura pulpar e superficial da dentina, buscando-se determinar parâmetros de irradiação seguros e efetivos para futura aplicação clínica. Para tal, foi realizado um estudo in vitro randomizado com duas fases experimentais. Na primeira fase, 30 blocos de dentina radicular bovina foram empregados para avaliar a temperatura superficial ocasionada por um único pulso laser empregando-se termografia no infravermelho, enquanto que, na segunda fase experimental, 30 dentes incisivos inferiores humanos foram empregados para avaliação da temperatura pulpar durante as irradiações por 10 segundos empregando-se termopares de resposta rápida. As irradiações foram efetuadas com laser de Er,Cr:YSGG,  = 2,78 μm, 20 Hz, sem refrigeração, com potências médias de 0,1 W, 0,25 W e 0,5 W, o que resultou em densidades de energia de 2,4 J/cm2, 6 J/cm2 e 12 J/cm2, respectivamente. Observou-se variações de temperatura superficial de 61  26 oC, 75  34 oC e 172  36 oC para os grupos irradiados com potência média de 0,1 W, 0,25 W e 0,5 W, respectivamente. Foram registradas elevações médias de temperatura pulpar de 0,81 ± 0,4 oC, 1,76 ± 0,7 oC e 2,95 ± 1,33 oC, para os grupos irradiados com potência média de 0,1 W, 0,25 W e 0,50 W, respectivamente. Concluiu-se que o laser de Er,Cr:YSGG promove elevações de temperatura superficiais que indicam a ocorrência de transformações químicas na superfície da dentina radicular; contudo, dos parâmetros testados, se considerarmos as elevações de temperatura pulpar, a potência média de 0,25 W é a que se apresenta mais promissora para futuro uso para prevenção da cárie radicular.

  • IPEN-DOC 27070

    GONÇALVES, KARINA de O.; SILVA, MONICA N. da; COURROL, LILIA C. . Síntese de nanopartículas de ouro funcionalizadas com ácido aminolevulínico e laser de pulsos ultracurtos. In: VIEIRA NETO, HUGO (Ed.); SOARES, ALCIMAR B. (Ed.); FÉLIX, RODRIGO P.B. da C. (Ed.); VIEIRA NETO, HUGO (Org.); MAIA, JOAQUIM M. (Org.); PICHORIM, SÉRGIO F. (Org.); GAMBA, HUMBERTO R. (Org.); COSTA, EDUARDO T. (Org.) CONGRESSO BRASILEIRO DE ENGENHARIA BIOMÉDICA, 25., 17-20 de outubro, 2016, Foz do Iguaçu, PR. Anais... Rio de Janeiro, RJ: Sociedade Brasileira de Engenharia Biomédica, 2016. p. 1913-1916.

    Abstract: As nanopartículas de ouro apresentam inúmeras aplicações na medicina. As diferenças de tamanho, forma e propriedades de superfície, fazem com que suas aplicações se tornem versáteis, como por exemplo, a terapia fototérmica e o rastreamento de tumores (biomarcadores). Foi recentemente demonstrado na literatura que a incorporação de nanopartículas de ouro na estrutura do ácido 5-aminolevulínco (5-ALA) melhora as propriedades fotodinâmicas do fármaco. O estudo com laser ocorreu visando à possibilidade de modificação no formato das nanopartículas, de esféricas para outras formas, entre elas bastões e prismas que resultam em bandas de plasmons de comprimentos de onda maiores, uma vez que nanopartículas com formato mais cilíndrico apresentam uma janela na região da janela óptica do tecido biológico e desta forma a luz aplicada em PDT teria maior profundidade de penetração no tecido. Assim propomos neste estudo, sintetizar nanopartículas de ouro com 5-ALA, para realizar o diagnóstico e a terapia (Teranóstica) de doenças com crescimento não controlável, de uma forma mais simples, menos invasiva e mais barata.

  • IPEN-DOC 27069

    PROVASI, C.; CASSIMIRO-SILVA, P.F.; ANA, P.A. da; ZEZELL, D.M. ; GOMES, A.S.L.; LINS, E.C.. Estudo da espectroscopia de reflexão com radiações visíveis e infravermelhas para discriminação de tecidos pulpares humanos sadios e patológicos. In: VIEIRA NETO, HUGO (Ed.); SOARES, ALCIMAR B. (Ed.); FÉLIX, RODRIGO P.B. da C. (Ed.); VIEIRA NETO, HUGO (Org.); MAIA, JOAQUIM M. (Org.); PICHORIM, SÉRGIO F. (Org.); GAMBA, HUMBERTO R. (Org.); COSTA, EDUARDO T. (Org.) CONGRESSO BRASILEIRO DE ENGENHARIA BIOMÉDICA, 25., 17-20 de outubro, 2016, Foz do Iguaçu, PR. Anais... Rio de Janeiro, RJ: Sociedade Brasileira de Engenharia Biomédica, 2016. p. 1909-1912.

    Abstract: A polpa dental é o tecido mais interno do dente. Sua principal função é garantir a dentinogênese e a sensibilidade dental, e por essa razão a informação clínica sobre a saúde da polpa é relevante. Polpas diagnosticadas como não-vitais são encaminhadas para um tratamento endodôntico agressivo, baseado na remoção de todo tecido degradado. Por esse motivo, deve-se haver um esforço em minimizar o número de falsos diagnósticos clínicos da vitalidade pulpar, na intenção de preservar a integridade do paciente. Esse estudo propõe a espectroscopia no visível e no infravermelho como método de melhorar a precisão no diagnóstico do status pulpar. Ele é baseado em confrontar a reflexão óptica dos tecidos no espectro do visível (VIS) e do infravermelho próximo (NIR) (350nm a 1.700nm) no intuito de discriminar polpas humanas vitais de outras polpas sintomáticas de pulpite. A Análise dos Componentes Principais (PCA) sobre os espectros de reflexão ainda propôs modelos matemáticos de diferenciação dos grupos. Os resultados revelaram que a reflexão óptica pode discriminar o status da vitalidade de polpas humanas vivas; e a análise estatística da PCA revelou precisão de acerto de 100% para radiações NIR e 95% para radiações VIS.

  • IPEN-DOC 27068

    PEREIRA, D.L. ; FREITAS, A.Z. ; ZEZELL, D.M. ; ANA, P.A.. Uso da tomografia por coerência óptica no monitoramento de lesões de erosão e abrasão em dentina. In: VIEIRA NETO, HUGO (Ed.); SOARES, ALCIMAR B. (Ed.); FÉLIX, RODRIGO P.B. da C. (Ed.); VIEIRA NETO, HUGO (Org.); MAIA, JOAQUIM M. (Org.); PICHORIM, SÉRGIO F. (Org.); GAMBA, HUMBERTO R. (Org.); COSTA, EDUARDO T. (Org.) CONGRESSO BRASILEIRO DE ENGENHARIA BIOMÉDICA, 25., 17-20 de outubro, 2016, Foz do Iguaçu, PR. Anais... Rio de Janeiro, RJ: Sociedade Brasileira de Engenharia Biomédica, 2016. p. 1861-1864.

    Abstract: O objetivo deste trabalho foi avaliar o potencial da tomografia por coerência óptica (OCT) para o diagnóstico precoce e monitoramento de lesões de erosão e abrasão em dentina. Para isso, foi realizado um estudo in vitro com 192 blocos de dentina radicular bovina de 8 mm2, distribuídos aleatoriamente em quatro grupos experimentais (n = 48): G1- sem tratamento; G2- tratamento com flúor fosfato acidulado (FFA, 1,23% F-, pH = 3,3–3,9); G3- irradiação com laser de Nd:YAG (1064nm, 0,6W, 10Hz, 84,9J/cm2); G4- aplicação de FFA, seguida de irradiação com laser de Nd:YAG. Após os tratamentos, as amostras foram submetidas a um desafio de erosão e abrasão por escovação (Sprite Zero, pH=2,6, 90s, 4x/dia) e remineralização (saliva artificial, pH=7) durante 15 dias, sendo avaliadas por OCT em 5 momentos distintos: antes e após os tratamentos, e após 5, 10 e 15 dias de desafio. Foi possível observar o desenvolvimento e evolução das lesões de erosão/abrasão e também foi possível relacionar a desmineralização do tecido decorrente do processo de erosão/abrasão com o coeficiente de atenuação óptica.

  • IPEN-DOC 27067

    OLIVEIRA, L.Z.; WATANABE, T.E.; GOUVEIA, D.S. ; BRESSIANI, A.H.A. ; RIBEIRO, C.. Estudo da síntese para obtenção de hidroxiapatita em meio de colágeno. In: VIEIRA NETO, HUGO (Ed.); SOARES, ALCIMAR B. (Ed.); FÉLIX, RODRIGO P.B. da C. (Ed.); VIEIRA NETO, HUGO (Org.); MAIA, JOAQUIM M. (Org.); PICHORIM, SÉRGIO F. (Org.); GAMBA, HUMBERTO R. (Org.); COSTA, EDUARDO T. (Org.) CONGRESSO BRASILEIRO DE ENGENHARIA BIOMÉDICA, 25., 17-20 de outubro, 2016, Foz do Iguaçu, PR. Anais... Rio de Janeiro, RJ: Sociedade Brasileira de Engenharia Biomédica, 2016. p. 251-254.

    Abstract: A obtenção da hidroxiapatita - HA nanoestruturada pode exigir modificações nas técnicas convencionais de síntese a fim de mimetizar estruturalmente as bioapatitas. A técnica de neutralização já vem sendo explorada em função de sua simplicidade e versatilidade, mas sua reprodutibilidade nem sempre é garantida, sugerindo a formação de fases intermediárias precursoras da HA, e algumas vezes outras fases, como o óxido de cálcio, além do alto estado de aglomeração de suas partículas. Com intuito de obter pós nanométricos de natureza dispersa e garantir a estabilidade da HA foi adicionado colágeno hidrolisado (4% em massa) ao meio de precipitação, variável ainda pouco explorada em processos de síntese. Os pós obtidos foram caracterizados por DRX, sendo observada a presença da fase pura e aumento da cristalinidade após calcinação a 800oC/3h, ainda verificou-se maior perda de massa para esta HA quando comparada a técnica clássica de precipitação (sem colágeno). Os resultados obtidos indicaram a viabilidade da metodologia para obtenção da HA, confirmando a natureza nanométrica dos pós e estabilidade da fase, logo após a síntese, e também após calcinação. A HA sintetizada apresentou cerca de 95% de densificação, microestrutura que pôde ser comprovada por MEV, além de manter sua estrutura cristalina, sem a formação de fase secundária, conforme observado por DRX, após sinterização a 1100oC/1h. A metodologia de síntese, em meio de colágeno, proporcionou a obtenção de pós de HA nanométrica de adequada sinterabilidade e estabilidade, podendo gerar microestruturas densas, mantendo fase única.

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A pesquisa no RD utiliza os recursos de busca da maioria das bases de dados. No entanto algumas dicas podem auxiliar para obter um resultado mais pertinente.

É possível efetuar a busca de um autor ou um termo em todo o RD, por meio do Buscar no Repositório , isto é, o termo solicitado será localizado em qualquer campo do RD. No entanto esse tipo de pesquisa não é recomendada a não ser que se deseje um resultado amplo e generalizado.

A pesquisa apresentará melhor resultado selecionando um dos filtros disponíveis em Navegar

Os filtros disponíveis em Navegar tais como: Coleções, Ano de publicação, Títulos, Assuntos, Autores, Revista, Tipo de publicação são autoexplicativos. O filtro, Autores IPEN apresenta uma relação com os autores vinculados ao IPEN; o ID Autor IPEN diz respeito ao número único de identificação de cada autor constante no RD e sob o qual estão agrupados todos os seus trabalhos independente das variáveis do seu nome; Tipo de acesso diz respeito à acessibilidade do documento, isto é , sujeito as leis de direitos autorais, ID RT apresenta a relação dos relatórios técnicos, restritos para consulta das comunidades indicadas.

A opção Busca avançada utiliza os conectores da lógica boleana, é o melhor recurso para combinar chaves de busca e obter documentos relevantes à sua pesquisa, utilize os filtros apresentados na caixa de seleção para refinar o resultado de busca. Pode-se adicionar vários filtros a uma mesma busca.

Exemplo:

Buscar os artigos apresentados em um evento internacional de 2015, sobre loss of coolant, do autor Maprelian.

Autor: Maprelian

Título: loss of coolant

Tipo de publicação: Texto completo de evento

Ano de publicação: 2015

Para indexação dos documentos é utilizado o Thesaurus do INIS, especializado na área nuclear e utilizado em todos os países membros da International Atomic Energy Agency – IAEA , por esse motivo, utilize os termos de busca de assunto em inglês; isto não exclui a busca livre por palavras, apenas o resultado pode não ser tão relevante ou pertinente.

95% do RD apresenta o texto completo do documento com livre acesso, para aqueles que apresentam o significa que e o documento está sujeito as leis de direitos autorais, solicita-se nesses casos contatar a Biblioteca do IPEN, bibl@ipen.br .

Ao efetuar a busca por um autor o RD apresentará uma relação de todos os trabalhos depositados no RD. No lado direito da tela são apresentados os coautores com o número de trabalhos produzidos em conjunto bem como os assuntos abordados e os respectivos anos de publicação agrupados.

O RD disponibiliza um quadro estatístico de produtividade, onde é possível visualizar o número dos trabalhos agrupados por tipo de coleção, a medida que estão sendo depositados no RD.

Na página inicial nas referências são sinalizados todos os autores IPEN, ao clicar nesse símbolo será aberta uma nova página correspondente à aquele autor – trata-se da página do pesquisador.

Na página do pesquisador, é possível verificar, as variações do nome, a relação de todos os trabalhos com texto completo bem como um quadro resumo numérico; há links para o Currículo Lattes e o Google Acadêmico ( quando esse for informado).

ATENÇÃO!

ESTE TEXTO "AJUDA" ESTÁ SUJEITO A ATUALIZAÇÕES CONSTANTES, A MEDIDA QUE NOVAS FUNCIONALIDADES E RECURSOS DE BUSCA FOREM SENDO DESENVOLVIDOS PELAS EQUIPES DA BIBLIOTECA E DA INFORMÁTICA.

O gerenciamento do Repositório está a cargo da Biblioteca do IPEN. Constam neste RI, até o presente momento 20.950 itens que tanto podem ser artigos de periódicos ou de eventos nacionais e internacionais, dissertações e teses, livros, capítulo de livros e relatórios técnicos. Para participar do RI-IPEN é necessário que pelo menos um dos autores tenha vínculo acadêmico ou funcional com o Instituto. Nesta primeira etapa de funcionamento do RI, a coleta das publicações é realizada periodicamente pela equipe da Biblioteca do IPEN, extraindo os dados das bases internacionais tais como a Web of Science, Scopus, INIS, SciElo além de verificar o Currículo Lattes. O RI-IPEN apresenta também um aspecto inovador no seu funcionamento. Por meio de metadados específicos ele está vinculado ao sistema de gerenciamento das atividades do Plano Diretor anual do IPEN (SIGEPI). Com o objetivo de fornecer dados numéricos para a elaboração dos indicadores da Produção Cientifica Institucional, disponibiliza uma tabela estatística registrando em tempo real a inserção de novos itens. Foi criado um metadado que contém um número único para cada integrante da comunidade científica do IPEN. Esse metadado se transformou em um filtro que ao ser acionado apresenta todos os trabalhos de um determinado autor independente das variáveis na forma de citação do seu nome.

A elaboração do projeto do RI do IPEN foi iniciado em novembro de 2013, colocado em operação interna em julho de 2014 e disponibilizado na Internet em junho de 2015. Utiliza o software livre Dspace, desenvolvido pelo Massachusetts Institute of Technology (MIT). Para descrição dos metadados adota o padrão Dublin Core. É compatível com o Protocolo de Arquivos Abertos (OAI) permitindo interoperabilidade com repositórios de âmbito nacional e internacional.

1. Portaria IPEN-CNEN/SP nº 387, que estabeleceu os princípios que nortearam a criação do RDI, clique aqui.


2. A experiência do Instituto de Pesquisas Energéticas e Nucleares (IPEN-CNEN/SP) na criação de um Repositório Digital Institucional – RDI, clique aqui.

O Repositório Digital do IPEN é um equipamento institucional de acesso aberto, criado com o objetivo de reunir, preservar, disponibilizar e conferir maior visibilidade à Produção Científica publicada pelo Instituto, desde sua criação em 1956.

Operando, inicialmente como uma base de dados referencial o Repositório foi disponibilizado na atual plataforma, em junho de 2015. No Repositório está disponível o acesso ao conteúdo digital de artigos de periódicos, eventos, nacionais e internacionais, livros, capítulos, dissertações, teses e relatórios técnicos.

A elaboração do projeto do RI do IPEN foi iniciado em novembro de 2013, colocado em operação interna em julho de 2014 e disponibilizado na Internet em junho de 2015. Utiliza o software livre Dspace, desenvolvido pelo Massachusetts Institute of Technology (MIT). Para descrição dos metadados adota o padrão Dublin Core. É compatível com o Protocolo de Arquivos Abertos (OAI) permitindo interoperabilidade com repositórios de âmbito nacional e internacional.

O gerenciamento do Repositório está a cargo da Biblioteca do IPEN. Constam neste RI, até o presente momento 20.950 itens que tanto podem ser artigos de periódicos ou de eventos nacionais e internacionais, dissertações e teses, livros, capítulo de livros e relatórios técnicos. Para participar do RI-IPEN é necessário que pelo menos um dos autores tenha vínculo acadêmico ou funcional com o Instituto. Nesta primeira etapa de funcionamento do RI, a coleta das publicações é realizada periodicamente pela equipe da Biblioteca do IPEN, extraindo os dados das bases internacionais tais como a Web of Science, Scopus, INIS, SciElo além de verificar o Currículo Lattes. O RI-IPEN apresenta também um aspecto inovador no seu funcionamento. Por meio de metadados específicos ele está vinculado ao sistema de gerenciamento das atividades do Plano Diretor anual do IPEN (SIGEPI). Com o objetivo de fornecer dados numéricos para a elaboração dos indicadores da Produção Cientifica Institucional, disponibiliza uma tabela estatística registrando em tempo real a inserção de novos itens. Foi criado um metadado que contém um número único para cada integrante da comunidade científica do IPEN. Esse metadado se transformou em um filtro que ao ser acionado apresenta todos os trabalhos de um determinado autor independente das variáveis na forma de citação do seu nome.