ROBERTO MAURO SCHOUERI

ROBERTO MAURO SCHOUERI

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Preliminary measurements using a Triple to Double Coincidence Ratio (TDCR) Liquid Scintillator Counter System
2021 - 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.
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.
Method to evaluate the L/D ratio of neutron imaging beams
2017 - PUGLIESI, R.; PEREIRA, M.A.S.; SCHOUERI, R.M.
An alternative simple method to evaluate the L/D ratio of neutron imaging beams is proposed. It is based on the behavior of the ratio “x/Ut”, which asymptotically tends to L/D for large values of the parameter “x”, that corresponds to the distance separating a gadolinium test object to the scintillator plane, where its image is formed. The method was applied to the neutron imaging equipment of the Nuclear and Energy Research Institute IPENCNEN/ SP and the obtained result was L/D = (104 ± 4). The consistency of the proposed method was verified by comparing this value with those ones obtained by a well - known and established procedure.
Projeto e implementação do equipamento para tomografia com nêutrons do IPEN-CNEN/SP
2016 - SCHOUERI, ROBERTO M.
Na presente dissertação, foi desenvolvido um equipamento para tomografia com nêutrons que está operacional e instalado no canal de irradiação 14 do Reator Nuclear de Pesquisas IEA-R1 do IPEN-CNEN/SP. As imagens apresentadas neste trabalho, são de objetos que foram selecionados de modo a realçarem uma das principais aplicações da técnica, que é o estudo de materiais hidrogenados mesmo se envoltos por espessa camada de alguns metais. Neste equipamento, uma tomografia completa pode ser obtida em 400 s, com uma resolução espacial máxima de 205 μm. Estas características são comparáveis às dos equipamentos mais desenvolvidos em operação em outros países, e propiciam imagens com qualidade suficiente para que sejam realizadas análises tanto qualitativas quanto quantitativas dos objetos inspecionados. A implementação da técnica da tomografia com nêutrons abre a possibilidade de novas linhas de pesquisa, pois disponibiliza uma nova ferramenta para inspeção de objetos, que fornece uma visão da sua estrutura interna, que nem sempre é possível por métodos de imageamento bidimensional.
Neutron imaging at the IPEN-CNEN/SP and its use in technology
2014 - PUGLIESI, R.; ANDRADE, M.L.G.; PEREIRA, M.A.S.; SCHOUERI, R.M.; DIAS, M.S.
The new facility for neutron tomography of IPEN-CNEN/SP and its potential to investigate hydrogenous substances
2014 - SCHOUERI, R.M.; DOMIENIKAN, C.; TOLEDO, F. de; ANDRADE, M.L.G.; STANOJEV PEREIRA, M.A.; PUGLIESI, R.
A six-BaFsub(2) detectors PAC spectrometer for measurements with short lived nuclear probes
2012 - DOMIENIKAN, CLAUDIO; LAPOLLI, ANDRE L.; SANTOS, BRIANNA B. dos; CARBONARI, ARTUR W.; SAXENA, RAJENDRA N.; SCHOUERI, ROBERTO M.
Electronic module for beam shutter control
2005 - DOMIENIKAN, C.; SCHOUERI, R.M.; TOLEDO, F.; PARENTE, C.B.R.
Development and installation of an automatic sample changer for neutron activation analysis
2013 - DOMIENIKAN, CLAUDIO; LAPOLLI, ANDRE L.; SCHOUERI, ROBERTO M.; MOREIRA, EDSON G.; VASCONCELLOS, MARINA B.A.
Development of an object-oriented software based on fuzzy-logic for controlling temperatures in pac experiments
2009 - LAPOLLI, ANDRE L.; YAMAGISHI, SUELI; DOMIENIKAN, CLAUDIO; SCHOUERI, ROBERTO M.; CARBONARI, ARTUR W.; SAXENA, RAJENDRA N.