Determination of uranium in tree bark samples by epithermal neutron activation analysis
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2017
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INTERNATIONAL NUCLEAR ATLANTIC CONFERENCE
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Resumo
In this study uranium (U) concentrations were determined in certi ed reference materials (CRMs) and
in tree bark samples collected in \Cidade Universit aria Armando de Salles Oliveira" (CUASO) USP,
S~ao Paulo. The barks were collected from di erent species namely Poincianella pluviosa and Tipuana
tipu. These bark samples were cleaned, dried, grated and milled for the analyses by epithermal neutron
activation analysis method (ENAA). This method consists on irradiating samples and U standard in IEAR1
nuclear reactor with thermal neutron
ux of 1:9 1012 n cm2 s1 during 40 to 60 seconds depending
on the samples matrices. The samples and standard were measured by gamma ray spectroscopy. U
was identi ed by the peak of 74.66 keV of 239U with half life of 23.47 minutes. Concentration of U was
calculated by comparative method. For analytical quality control of U results, certi ed reference materials
were analysed. Results obtained for CRMs presented good precision and accuracy, with jZ scorej 0.39.
Uranium concentrations in tree barks varied from 83.1 to 627.6 ng g1 and the relative standard deviations
of these results ranged from 1.8 to 10%.
Como referenciar
LIMA, NICOLE P. de; SAIKI, MITIKO. Determination of uranium in tree bark samples by epithermal neutron activation analysis. In: INTERNATIONAL NUCLEAR ATLANTIC CONFERENCE, October 22-27, 2017, Belo Horizonte, MG. Proceedings... Rio de Janeiro, RJ: Associação Brasileira de Energia Nuclear, 2017. Disponível em: http://repositorio.ipen.br/handle/123456789/28243. Acesso em: 20 Mar 2026.
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