RENATO SEMMLER

RENATO SEMMLER

(Fonte: Lattes)

Resumo

Graduado em Física pela Pontifícia Universidade Católica de São Paulo (1989), Mestre em Tecnologia Nuclear pela Universidade de São Paulo (1993) e Doutor em Tecnologia Nuclear pela Universidade de São Paulo (2006). Atualmente é pesquisador da Comissão Nacional de Energia Nuclear (CNEN), lotado no Centro do Reator de Pesquisas (CERPq) do Instituto de Pesquisas Energéticas e Nucleares (IPEN). Docente da pós-graduação stricto sensu - Programa de tecnologia nuclear do IPEN - Universidade de São Paulo e da pós-graduação stricto sensu - Mestrado profissional de tecnologia das radiações na saúde. Tem experiência na área de Física Nuclear de baixas energias atuando nos seguintes temas: reações de captura de nêutrons térmicos (prompt gamma rays), método k0 de análise por ativação neutrônica, caracterização do espectro de nêutrons junto aos canais de irradiação do reator IEA-R1, espectroscopia gama, fotodesintegração, reações fotonucleares (fotofissão e fotonêutrons) e ensino de física. Professor e organizador da EAEN - Escola Avançada de Energia Nuclear para estudantes do Ensino Médio, preferencialmente envolvidos com olimpíadas de física e química: Teoria e Aplicações das Ciências Nucleares. Professor de física com mais de 25 anos de experiência em cursos universitários, pré-vestibular e ensino médio. (Texto extraído do Currículo Lattes em 27 dez. 2021)

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Development of a web free software for the absolute efficiency calibration for HPGe type detectors
2019 - KAISER, THIAGO J.S.; SEMMLER, RENATO; LIMA, GEAN B. de
The IEA-R1, swimming pool research reactor, from the Institute of Energy and Nuclear Research (IPEN), among other uses, the instrumental neutron activation analysis technique is widely used, and successfully, by the Neutron Activation Laboratory (LAN), using the comparative method. In this method a sample is irradiated simultaneously with a standard. In order to overcome the difficulty of a multi -elementary analysis, because it was necessary to prepare several standards, the k0 method of neutron activation was developed. In method k, the concentration of sample elements is calculated in relation to a comparator element, generally gold. However, for the use of the k0 method, it is necessary to accurately determine the detection efficiency in the energy range of interest and the geometry of the experimental arrangement. In order to circumvent the manual processing of the data in spreadsheets, which could be affected by errors, a free code web software was developed for calibration in absolute efficiency of an HPGe type detector for neutron activation analysis based on the k0. We used the free, low learning curve standardized Python programming language in the eScience project, which is part of the software, and the Django web framework with a simple and intuitive interface. In the system it is possible to register the detectors, radioactive sources and their manufacturers, projects and spectra, attributes necessary to calculate the absolute efficiency of an HPGe type detector. In addition to calculating efficiency, the system plots the graph with the efficiency points, trend curve, with possibility of adjustments, and error bar representing the uncertainties. The system issues reports on spectra and efficiency data for each project. The reports make it possible to check the data as well as its use in other applications. Because it is a web software, its access is allowed from any device with an internet connection. Another result obtained with the system is the reduction of the possibility of errors with the manual treatment of the data in spreadsheets.
Determination of k0 and Q0 for 74Se, 113In, 186W and 191Ir targets applying covariance analysis
2019 - BARROS, L.F.; RIBEIRO, R.V.; DIAS, M.S.; MORALLES, M.; SEMMLER, R.; YAMAZAKI, I.M.; KOSKINAS, M.F.
In the present work, the determinations of k0 and Q0 for 74Se, 113In, 186W and 191Ir targets were performed. The irradiations were conducted near the core of the IEA-R1 4.5MW swimming-pool nuclear research reactor of the Instituto de Pesquisas Energéticas e Nucleares (IPEN-CNEN/SP – Nuclear and Energy Research Institute), in São Paulo, Brazil. The irradiation position was chosen where the neutron spectrum shape parameter α is very close to zero. For this reason, the correction to be applied for the determination of Q0 is very close to one, thus improving the accuracy of the results. For each experiment, two irradiations were carried out in sequence: the first one with bare samples and the second with a cadmium cover around the samples. All partial uncertainties were considered, applying the covariance matrix methodology. The final results were compared with the literature.
Calibration of the short irradiation facility for K0 − NAA implementation at the IEA-R1 Reactor
2019 - OLIVEIRA, J.P.; SILVA, P.S.C.; SEMMLER, R.
The short irradiation facility of the IEA-R1 nuclear research reactor at IPEN, S~ao 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 implementing the k0-NAA method at the Neutron Activation Analysis Laboratory (LAN), the reactor parameters and f were obtained using the bare triple method. In this method, a set of three neutron ux monitors were irradiated without Cd-cover. The e ciency curve of the gamma-ray spectrometer used were determined by measuring calibrated radioactive sources at the usually utilized counting geometries. The results obtained for the parameters and f were respectively 0:0384 0:0016 and 35:67 0:26. The obtained value of f shows that the neutrons in the irradiation position are well thermalized, in other words, the value of f, means that thermal neutron ux is 35 times higher than epithermal neutron ux. It means that this irradiation position is well thermalized. The variation of these parameters was studied with time and the reproducibility was veri ed.
Determination of ksub(0) and Qsub(0) sup(113)In(n,'gamma')sup(114)In reactor with covariance analysis
2016 - BARROS, LIVIA F.; DIAS, MAURO S.; KOSKINAS, MARINA F.; YAMAZAKI, IONE M.; SEMMLER, RENATO; RIBEIRO, RAFAEL V.
Caracterização do fluxo de nêutrons epitérmicos do reator IEA-R1 utilizando o método bare triple monitor para o uso em análise por ativação
2014 - FLORES, JOAO P. de O.; SEMMLER, RENATO
Caracterização do fluxo de nêutrons epitérmicos do reator IEA-R1 utilizando o método bare triple monitor para o uso em análise por ativação
2013 - FLORES, JOAO P. de O.; SEMMLER, RENATO
Determination of k0 for 186W(n,gamma)187W, 94Zr(n,gamma)95Zr and 96Zr(n, gamma)97Zr reactions with covariance analysis
2015 - BARROS, LIVIA F.; DIAS, MAURO da S.; KOSKINAS, MARINA; YAMAZAKI, IONE; SEMMLER, RENATO
Caracterização do fluxo de nêutrons epitérmicos do reator IEA-R1 utilizando o método Bare Triple monitor para o uso em análise por ativação
2015 - FLORES, JOAO P. de O.; SEMMLER, RENATO
Determination of ksub(0) for sup(63)Cu(n,'gamma')sup(64)Cu reaction with covariance analysis
2015 - BARROS, LIVIA F.; DIAS, MAURO S.; KOSKINAS, MARINA F.; YAMAZAKI, IONE M.; SEMMLER, RENATO
How the nuclear safety team conducts emergency exercises at the IEA-R1 reactor
2015 - VAZ, ANTONIO C.A.; SILVA, DAVILSON G.; TOYODA, EDUARDO Y.; SANTIA, PAULO S.; CONTI, THADEU N.; SEMMLER, RENATO; CARVALHO, RICARDO N.