IONE MAKIKO YAMAZAKI
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Artigo IPEN-doc 30602 Re-characterization of pneumatic station irradiation position of IEA-R1 reactor for use in k0 - INAA method2024 - FLORES, J.P.O.; SEMMLER, R.; DIAS, M.S.; KOSKINAS, M.F.; MOREIRA, D.S.; YAMAZAKI, I.M.; SILVA, P.S.C.; MAIHARA, V.A.Artigo IPEN-doc 29835 Primary standardization and Monte Carlo modeling of ( 243Am + 239Np) by means of a 4π(PC)-γ coincidence counting system2023 - KOSKINAS, MARINA F.; MOREIRA, DENISE S.; YAMAZAKI, IONE M.; COLONNO, MARCELO; SEMMLER, RENATO; MORAIS, THALES S.L.; DIAS, MAURO S.The procedure followed by the Nuclear Metrology Laboratory (LMN) at the IPEN for the primary standardization of a ( 243Am + 239Np) solution, in secular equilibrium, is described. The measurement was carried out in a 4π(PC) (α,β)− γ coincidence system. The total activity per unit mass of the solution was determined by the extrapolation technique, using a software coincidence counting systsem. The extrapolation curves were compared with Monte Carlo calculations by means of Code ESQUEMA, used in previous works, which, was improved and applied in order to calculate the alpha, beta, gamma, X-rays and coincidence spectra.Artigo IPEN-doc 29810 k0‑IPEN2023 - DIAS, MAURO da S.; SEMMLER, RENATO; KOSKINAS, MARINA F.; MOREIRA, DENISE S.; YAMAZAKI, IONE M.; BRANCACCIO, FRANCO; BARROS, LIVIA F.; RIBEIRO, RAFAEL V.; MORAIS, THALES S.L. deA software package for INAA (Instrumental Neutron Activation Analysis), developed at the Nuclear Metrology Laboratory of the IPEN-CNEN/SP, called k0-IPEN, is described. The package consists of a main program linked to nine subprograms designed to perform automatically most of the tasks necessary in order to obtain the mass fractions of the irradiated samples. External efficiency curves calculated by the Monte Carlo code MCNP6 can be read to extend the calibration curve to source to detector distances where only a few experimental points are available. Covariance analysis was used in all steps of the calculation. The validation of the code was tested in an intercomparison sponsored by the IAEA.Resumo IPEN-doc 28957 k0-IPEN2022 - DIAS, MAURO da S.; SEMMLER, RENATO; KOSKINAS, MARINA F.; MOREIRA, DENISE S.; YAMAZAKI, IONE M.; BRANCACCIO, FRANCO; BARROS, LIVIA F.; RIBEIRO, RAFAEL V.; MORAIS, THALES S.L. deA new software package for INAA, developed at the Nuclear Metrology Laboratory (LMN) of the Nuclear and Energy Research Institute (IPEN-CNEN/SP), called k0-IPEN, is described. The package consists of a main program linked to nine subprograms designed to perform automatically all the tasks necessary in order to obtain the mass fractions of the irradiated samples. The goals of these nine routines are: a) to calculate the experimental peak efficiencies and P/T ratios for the standard sources, together with all the corresponding uncertainties; b) to correct the peak efficiencies for coincidence summing; c) to fit the peak efficiencies and P/T ratios with log-log polynomial functions; d) to determine experimentally the and f parameters by the Triple Bare and by the Cd Ratio Multimonitor Methods; e) to correct for interferences; f) to determine the average mass fractions, taking into account the correlations among all partial uncertainties involved. In the present version, the only data that must be inserted as input parameter, externally from the package, are the self-shielding correction factor, which is calculated by the MATSSF code, and the geometry factor that corrects for the difference between sizes of standard sources and measured samples. The code can deal with different spectrum formats such as CHN, SPE and CNF. The routine designed to calculate the peak areas has a simple algorithm and is not yet capable of separating multiplets. Therefore, it is suitable for analysing separated peaks, such as those found in standard calibration source measurements. However, for complex spectra, the code can read peak list files obtained from other codes, such as HyperMet or HyperLab. External efficiency curves calculated by the Monte Carlo code MCNP6 can be read to extend the calibration curve to regions where there are only a few experimental points available. The code k0-IPEN is being tested and its validation accomplished by means of an intercomparison sponsored by the IAEA, and presented at this conference.Capítulo IPEN-doc 28714 Medidas de parâmetros associados a reações nucleares induzidas por nêutrons no reator IEA-R12022 - DIAS, MAURO S.; SEMMLER, RENATO; YAMAZAKI, IONE M.; MOREIRA, DENISE S.; BRANCACCIO, FRANCO; KOSKINAS, MARINA F.O presente trabalho apresenta uma retrospectiva dos diversos parâmetros para reações nucleares induzidas por nêutrons, que foram determinados pelo Laboratório de Metrologia Nuclear (LMN) do IPEN, utilizando o reator IEA-R1. Esses parâmetros incluem: secções de choque, integrais de ressonância, além dos parâmetros k0 e Q0, que são associados ao Método de Ativação Neutrônica (NAA). Para este propósito, o LMN dispõe de sistemas de calibração primários e secundários, que são necessários para a determinação da atividade do radionuclídeo produzido na reação com nêutron. Os resultados destes estudos possibilitaram a melhoria da qualidade nos dados nucleares, a publicação de diversos trabalhos em periódicos internacionais, além da orientação de Mestrados e Doutorados.Capítulo IPEN-doc 28713 Padronização primária de radionuclídeos produzidos no reator IEA-R12022 - KOSKINAS, MARINA F.; MOREIRA, DENISE S.; YAMAZAKI, IONE M.; BRANCACCIO, FRANCO; SEMMLER, RENATO; DIAS, MAURO S.Neste trabalho, apresentamos uma retrospectiva dos radionuclídeos produzidos no reator IEA-R1, que foram padronizados no Laboratório de Metrologia Nuclear (LMN) do CRPq, IPEN-CNEN/SP. Para este propósito, o laboratório dispõe de sistemas de calibração primários, utilizando a técnica de coincidência 4πβ−γ, aplicando uma metodologia específica para cada radionuclídeo. Neste método, os elétrons e os raios-X são usualmente registrados por um detector 4π consistindo em um contador proporcional, cintilador plástico ou cintilador líquido. Os raios gama são registrados por meio de detectores semicondutores de HPGe ou de cristais de NaI(Tl). Neste trabalho são apresentados os diagramas eletrônicos empregados, os métodos de análise de dados e de incertezas implementados por meio da aplicação da metodologia de análise de covariância, além da aplicação de métodos computacionais de simulação dos sistemas de medida pela técnica de Monte Carlo. A padronização de radionuclídeos em sistemas absolutos tem possibilitado a determinação de parâmetros nucleares, como: probabilidade de emissão gama por decaimento e coeficientes de conversão interna, entre outros, contribuindo para a melhoria nos dados nucleares, proporcionando a formação de recursos humanos de alto nível, por meio de mestrados, doutorados e pós- -doutorados, além da participação em congressos e publicação de artigos em periódicos internacionais.Artigo IPEN-doc 27914 Calibration of the short irradiation facility for k0 - NAA implementation at the IEA-R1 reactor2021 - OLIVEIRA, J.P.; SILVA, P.S.C.; SEMMLER, R.; DIAS, M.S.; KOSKINAS, M.F.; MOREIRA, D.S.; YAMAZAKI, I.M.The short irradiation facility of the IEA-R1 nuclear research reactor at IPEN, São Paulo, Brazil, has been used for short irradiation of samples for the purpose of determining the concentration of elements of these samples through the use of the instrumental neutron activation analysis technique. With the aim of determine precisely the reactor parameters α and f, for implementing the k0-NAA method at the Neutron Activation Analysis Laboratory (LAN), was used the bare triple method. In this method, a set of three neutron flux monitors were irradiated without Cd-cover. The efficiency curve of the gamma-ray spectrometer used was determined by measuring calibrated radioactive sources at the commonly used counting geometries. The results for the parameters α and f were respectively 0.0384±0.0016 and 35.67±0.26. This value of f shows that the neutrons in the irradiation position are well thermalized. The variation of these parameters was studied with time and the reproducibility was verified.Artigo IPEN-doc 27902 Preliminary measurements using a Triple to Double Coincidence Ratio (TDCR) Liquid Scintillator Counter System2021 - KOSKINAS, M.F.; KUZNETSOVA, M.; MOREIRA, D.S.; SHOUERI, R.M.; YAMAZAKI, I.M.; MORAIS, T.S.L.; SEMMLER, R.; DIAS, M.S.The preliminary measurements using a Triple to Double Coincidence Ratio (TDCR) Liquid Scintillator Counter System, developed by the Nuclear Metrology Laboratory (LMN) at IPEN, is presented and 14C was selected to be standardized. This solution was previously calibrated by the efficiency tracing technique using a (PC)coincidence system, employing 60Co as a tracer. In order to determine the final activity, a Monte Carlo simulation was used to generate the extrapolation curve. The Software Coincidence System (SCS) developed by the LMN was used for both systems to register the events. MICELLE 2 code was used to calculate the theoretical TDCR efficiency. Measurements using HIDEX, a commercial liquid scintillator system, were also carried out and the results from the three methods were compared, showing a good agreement.Artigo IPEN-doc 27118 Primary standardization and determination of gamma ray emission intensities of Ho-1662020 - YAMAZAKI, I.M.; KOSKINAS, M.F.; MOREIRA, D.S.; SEMMLER, R.; BRANCACCIO, F.; DIAS, M.S.The procedure followed by the Nuclear Metrology Laboratory (LMN) at the IPEN-CNEN/SP, in S~ao Paulo, for the primary standardization of 166Ho is described. The activity of 166Ho was determined by the efficiency extrapolation technique applied to a 4πβ(PC)-γ coincidence system using a gas flow proportional counter in 4π geometry coupled to a 76 x 76 mm NaI(Tl) crystal. The results for the γ-rays intensities at 80.57 and 1379.45 keV were 0.0651(11) and 0.00904(11), respectively.Resumo IPEN-doc 27045 Standardization of 59Fe by 4π(PC)β-γ software coincidence system2015 - KOSKINAS, M.F.; YAMAZAKI, I.M.; DIAS, M.S.