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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  • Resumo IPEN-doc 23851
    Long-term performance assessment of hpge detectors used in the neutron activation analysis (LAN) of IPEN-CNEN/SP (Brazil)
    2016 - ZAHN, GUILHERME S.; GENEZINI, FREDERICO A.; TICIANELLI, REGINA B.; SAIKI, MITIKO
    In nuclear spectroscopy measurements, the performance of the radiation detectors employed is a key issue in the final results; moreover, in comparative measurements, the results depend on the stability of the detector between measurements, so that the detector’s efficiency can be effectively ruled out of the equation. Due to the relevance of the detectors' performances, LAN-IPEN have been performing daily verification measurements in its operational detectors since 1999; this verification consists in the measurement of composite 57+60Co sources, in which the position, resolution and CPS (counts per second) for the 122 keV peak of 57Co and the 1332 keV peak of 60Co are registered, along with the date and time of the measurement. In this work, verification data for 11 HPGe detectors from two different makers and three different intrinsic configurations were analyzed in respect to the efficiency stability (determined by the arbitrary efficiency calculated by correcting the CPS for the isotope's decay) and resolution for both peaks, as well as the ratio between the efficiencies for 122 keV and 1332 keV. The results allow a discussion about the stability of these parameters over time (in some cases, more than 15 years), their sensitivity to imminent detector failures and their performance after a failure has been corrected; moreover, the results show a clear correlation between the maker or configuration and the long-term performance of the detector.
  • 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
  • Resumo IPEN-doc 20218
    Enhancing NAA results by using robust statistics
    2014 - ZAHN, GUILHERME S.; GENEZINI, FREDERICO A.; SECCO, MARCELLO; TICIANELLI, REGINA B.; FIGUEIREDO, ANA M.G.