SABINE NEUSATZ GUILHEN

Resumo

Possui graduaĆ§Ć£o em QuĆ­mica com atribuiƧƵes TecnolĆ³gicas e BiotecnolĆ³gicas pelo Instituto de QuĆ­mica da Universidade de SĆ£o Paulo (2005), mestrado (2009) e doutorado (2018) em Tecnologia Nuclear (Materiais) pelo Instituto de Pesquisas EnergĆ©ticas e Nucleares (IPEN), Universidade de SĆ£o Paulo. Tem experiĆŖncia em QuĆ­mica AnalĆ­tica com ĆŖnfase em AnĆ”lise de TraƧos, atuando principalmente no desenvolvimento de mĆ©todos analĆ­ticos empregando tĆ©cnicas espectrofotomĆ©tricas (AAS, ICP OES e ICP-MS) para caracterizaĆ§Ć£o de amostras ambientais, arqueolĆ³gicas, biolĆ³gicas, forenses e nucleares. Atualmente, ocupa o cargo de Tecnologista em "CaracterizaĆ§Ć£o QuĆ­mica" no Centro de QuĆ­mica e Meio Ambiente (CQMA) do IPEN (CNEN/SP), onde desempenha atividades de pesquisa e desenvolvimento tecnolĆ³gico em atendimento Ć s demandas institucionais ligadas ao Ciclo do CombustĆ­vel Nuclear e aos Programas de Pesquisa de carĆ”ter multidisciplinar, em apoio a projetos de InovaĆ§Ć£o TecnolĆ³gica e ao Programa de PĆ³s-GraduaĆ§Ć£o do IPEN/USP. AlĆ©m disso, atua na geraĆ§Ć£o de produtos tecnolĆ³gicos e no desenvolvimento de materiais adsorventes de baixo custo e alto valor agregado visando o aproveitamento de materiais e resĆ­duos naturais e/ou renovĆ”veis no tratamento de efluentes e rejeitos. (Texto extraĆ­do do CurrĆ­culo Lattes em 4 maio 2023)

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Agora exibindo 1 - 2 de 2
  • Artigo IPEN-doc 25737
    Application of bias correction methods to improve U3Si2 sample preparation for quantitative analysis by WDXRF
    2019 - SCAPIN, M.A.; GUILHEN, S.N.; AZEVEDO, L.C.; COTRIN, M.E.B.; PIRES, M.A.F.
    The determination of silicon (Si), total uranium (U) and impurities in uranium-silicide (U3Si2) samples by wavelength dispersion X-ray fluorescence technique (WDXRF) has been already validated and is currently implemented at IPENā€™s X-Ray Fluorescence Laboratory (IPEN-CNEN/SP) in SĆ£o Paulo, Brazil. Sample preparation requires the use of approx-imately 3 g of H3BO3 as sample holder and 1.8 g of U3Si2. However, because boron is a neutron absorber, this proce-dure precludes the recovery of U3Si2 from the samples, preventing its use as nuclear fuel. Consequently, a significant amount of uranium is wasted in this process. An estimated average of 15 samples per month is expected to be analyzed by WDXRF, resulting in approx. 320 g of U3Si2 that wouldnā€™t return to the nuclear fuel cycle. The purpose of this paper is to present a new preparation method, replacing H3BO3 by cellulose acetate {[C6H7O2(OH)3-m(OOCCH3)m], m = 0~3}, thus enabling the recovery of the boron-free U3Si2 from the samples. The results demonstrate that the suggested sample preparation approach is statistically satisfactory, allowing the optimization of the procedure.
  • Artigo IPEN-doc 24071
    Application of bias correction methods to improve U3Si2 sample preparation for quantitative analysis by WDXRF
    2017 - SCAPIN, MARCOS A.; GUILHEN, SABINE N.; AZEVEDO, LUCIANA C. de; COTRIM, MARYCEL E.B.; PIRES, MARIA A.F.
    The determination of silicon (Si), total uranium (U) and impurities in uranium-silicide (U3Si2) samples by wavelength dispersion X-ray fluorescence technique (WDXRF) has been already validated and is currently implemented at IPENā€™s X-Ray Fluorescence Laboratory (IPEN-CNEN/SP) in SĆ£o Paulo, Brazil. Sample preparation requires the use of approximately 3 g of H3BO3 as sample holder and 1.8 g of U3Si2. However, because boron is a neutron absorber, this procedure precludes U3Si2 sampleā€™s recovery, which, in time, considering routinely analysis, may account for significant unusable uranium waste. An estimated average of 15 samples per month are expected to be analyzed by WDXRF, resulting in approx. 320 g of U3Si2 that wouldnā€™t return to the nuclear fuel cycle. This not only impacts in production losses, but generates another problem: radioactive waste management. The purpose of this paper is to present the mathematical models that may be applied for the correction of systematic errors when H3BO3 sample holder is substituted by cellulose-acetate {[C6H7O2(OH)3-m(OOCCH3)m], m = 0~3}, thus enabling U3Si2 sampleā€™s recovery. The results demonstrate that the adopted mathematical model is statistically satisfactory, allowing the optimization of the procedure.