GUILHERME SOARES ZAHN

Resumo

Has a bachelor's degree in Physics from Universidade de São Paulo (1991), master's at Nuclear Engineering from Universidade de São Paulo (1994) and doctorate at Nuclear Engineering from Universidade de São Paulo (2006). Has experience in nuclear ans applied physics, focusing on nuclear structure, acting on the following subjects: beta decay, neutron activation, gamma spectroscopy, nuclear structure, neutron flux determination and detection, and also on the development od instrumentation and sotware aimed at nuclear applications. (Text obtained from the Currículo Lattes on October 14th 2021)


Possui graduação em Física pela Universidade de São Paulo (1991), mestrado em Tecnologia Nuclear pela Universidade de São Paulo (1994) e doutorado em Tecnologia Nuclear pela Universidade de São Paulo (2006). Atualmente é pesquisador da Comissão Nacional de Energia Nuclear, lotado no Centro do Reator de Pesquisas do Instituto de Pesquisas Energéticas e Nucleares. Tem experiência na área de Física Nuclear, com ênfase em Estrutura Nuclear, atuando principalmente nos seguintes temas: decaimento beta, detecção de nêutrons, irradiadores de nêutrons, ativação neutrônica, fluxo de nêutrons, desenvolvimento de instrumentação e de software para aplicações nucleares. (Texto extraído do Currículo Lattes em 14 out. 2021)

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Resultados de Busca

Agora exibindo 1 - 4 de 4
  • Artigo IPEN-doc 25771
    Evaluation of the uncertainty associated with sample holders in NAA measurements in LAN/IPEN
    2019 - ZAHN, G.S.; TICIANELLI, R.B.; SAIKI, M.; GENEZINI, F.A.
    In IPEN’s Neutron Activation Laboratory (LAN/IPEN), thin stainless steel sample holders are used for gamma spec-trometry in NAA measurements. This material is very practical, but its chemical composition may be troublesome, as it presents large amounts of elements with intermediate atomic number, with attenuation factors for low-energy gamma-rays that must not be neglected. In this study, count rates obtained using different sample holders were compared. To accomplish that, an Am-241 source, with 59-keV gamma emission, was used so that low-energy gamma attenuation differences can be determined. Moreover, in order to study the energy dependence of these differences, a Ho-166m source was also used. From these results, it was possible to analyze the experimental error associated to the variations between sample holders, with the aim of introducing an addictive term to the uncertainty analysis of comparative Neu-tron Activation Analysis results.
  • Artigo IPEN-doc 24074
    Evaluation of the uncertainty associated with sample holders in NAA measurements in LAN/IPEN
    2017 - ZAHN, GUILHERME S.; TICIANELLI, REGINA B.; SAIKI, MITIKO; GENEZINI, FREDERICO A.
    In IPEN’s Neutron Activation Laboratory (LAN/IPEN), thin stainless steel sample holders are used for gamma spectrometry in NAA measurements. This material is very practical, but its chemical composition may be troublesome, as it presents large amounts of elements with intermediate atomic number, with attenuation factors for low-energy gamma-rays that must not be neglected. In this study, count rates obtained using different sample holders were compared. To accomplish that, an Am-241 source, with 59-keV gamma emission, was used so that low-energy gamma attenuation differences can be determined. Moreover, in order to study the energy dependence of these differences, a Ho-166m source was also used. From these results, it was possible to analyze the experimental error associated to the variations between sample holders, with the aim of introducing an addictive term to the uncertainty analysis of comparative Neutron Activation Analysis results.
  • Resumo IPEN-doc 20561
    Long-term performance assessment of HPGE detectors used in the neutron activation analysis (LAN) of IPEN-CNEN/SP (Brazil)
    2014 - ZAHN, GUILHERME S.; GENEZINI, FREDERICO A.; TICIANELLI, REGINA B.; SAIKI, MITIKO
  • Artigo IPEN-doc 18999
    Use of daily detector verification data for isotopical half-life determination
    2012 - GONCALVES, VITOR C.; ZAHN, GUILHERME S.; GENEZINI, FREDERICO A.; TICIANELLI, REGINA B.; SAIKI, MITIKO