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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Preliminary measurements using a Triple to Double Coincidence Ratio (TDCR) Liquid Scintillator Counter System
2019 - KOSKINAS, MARINA F.; KUZNETSOVA, MARIA; MOREIRA, DENISE S.; SCHOUERI, ROBERTO M.; MORAIS, THALES S.L. de; SEMMLER, RENATO; DIAS, MAURO da 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. The TDCR system makes use of three photomultipliers positioned at 120° relative angle, operating in coincidence. For this preliminary measurement, 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. 14C was chosen due to be a beta pure emitter with low end-point energy of 156 keV. 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.
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.
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.
Implementation of K0-INAA method at the Neutron Activation Analysis Laboratory, LAN-IPEN, São Paulo, Brazil. Application to geological samples
2011 - MARIANO, DAVI B.; FIGUEIREDO, ANA M.G.; TICIANELLI, REGINA B.; SEMMLER, RENATO
Education in nuclear science at IPEN/CNEN, São Paulo, Brazil:Advanced School of Nuclear Energy – EAEN
2011 - SEMMLER, R.; CATHARINO, M.G.M.; VASCONCELLOS, M.B.A.
Implementation of the K0-standardization method for analysis of geological samples at the neutron activation analysis laboratory, São Paulo, Brazil
2011 - MARIANO, DAVI B.; FIGUEIREDO, ANA M.G.; SEMMLER, RENATO
Application of the ksub(0)-INAA method for analysis of biological samples at the pneumatic station of the IEA-R1 nuclear research reactor
2013 - PUERTA, DANIEL C.; FIGUEIREDO, ANA M.G.; SEMMLER, RENATO; JACIMOVIC, RODOJKO
ksub(0)-INAA method at the pneumatic station of the IEA-R1 nuclear research reactor. Application to geological samples
2011 - MARIANO, DAVI B.; FIGUEIREDO, ANA M.G.; SEMMLER, RENATO
ksub(0)-INAA of biological matrices at IPEN neutron activation analysis laboratory, Sao Paulo, using the k0_IAEA software
2014 - PUERTA, D.C.; FIGUEIREDO, A.M.G.; SEMMLER, R.; JACIMOVIE, R.