Determination of uranium in tree bark samples by epithermal neutron activation analysis

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dc.contributor.authorLIMA, N.P.pt_BR
dc.contributor.authorSAIKI, M.pt_BR
dc.coverageNacionalpt_BR
dc.date.accessioned2019-07-29T18:55:51Z
dc.date.available2019-07-29T18:55:51Z
dc.date.issued2019pt_BR
dc.description.abstractIn this study uranium (U) concentrations were determined in certified reference materials (CRMs) and in tree bark samples collected in “Cidade Universitária Armando de Salles Oliveira” (CUASO) USP, São Paulo. CRMs were analyzed using the experimental conditions used for barks for analytical quality control of U determina-tion. The barks were collected from different species namely Poincianella pluviosa and Tipuana tipu. These bark samples were cleaned, dried, grated and milled for the analyses by epithermal neutron activation analysis meth-od (ENAA). This method consists on irradiating CRMs, samples and U standard in IEA-R1 nuclear reactor with thermal neutron flux of 1.9 x 1012 n cm-2 s-1 during 40 to 60 seconds depending on their matrices. The U was iden-tified, using gamma-ray spectrometry, by the peak of 74.66 keV of 239U with half-life of 23.47 minutes. Concen-tration of U was calculated by comparative method. Results obtained for CRMs presented good precision and accuracy, with |Z score| ≤ 0.39. Uranium concentrations in tree barks varied from 83.1 to 627.6 ng g-1 and the relative standard deviations of these results ranged from 1.8 to 10 %.pt_BR
dc.format.extent1-11pt_BR
dc.identifier.citationLIMA, N.P.; SAIKI, M. Determination of uranium in tree bark samples by epithermal neutron activation analysis. <b>Brazilian Journal of Radiation Sciences</b>, v. 7, n. 2A, p. 1-11, 2019. DOI: <a href="https://dx.doi.org/10.15392/bjrs.v7i2A.574">10.15392/bjrs.v7i2A.574</a>. Disponível em: http://repositorio.ipen.br/handle/123456789/29972.
dc.identifier.doi10.15392/bjrs.v7i2A.574pt_BR
dc.identifier.fasciculo2Apt_BR
dc.identifier.issn2319-0612pt_BR
dc.identifier.orcid0000-0003-2197-3592pt_BR
dc.identifier.percentilfiSem Percentilpt_BR
dc.identifier.urihttp://repositorio.ipen.br/handle/123456789/29972
dc.identifier.vol7pt_BR
dc.relation.ispartofBrazilian Journal of Radiation Sciencespt_BR
dc.rightsopenAccesspt_BR
dc.sourceThe Meeting on Nuclear Applications (ENAN), 13th, 22-27 de outubro, 2017, Belo Horizonte, MGpt_BR
dc.subjectbark
dc.subjecttrees
dc.subjectbiological markers
dc.subjectepithermal neutrons
dc.subjectthermal neutrons
dc.subjectneutron activation analysis
dc.subjectneutron flux
dc.subjectconcentration ratio
dc.subjectgamma spectroscopy
dc.subjectquality control
dc.subject uranium
dc.subjecturanium 239
dc.titleDetermination of uranium in tree bark samples by epithermal neutron activation analysispt_BR
dc.typeArtigo de periódicopt_BR
dspace.entity.typePublication
ipen.autorMITIKO SAIKI
ipen.autorNICOLE PEREIRA DE LIMA
ipen.codigoautor1178
ipen.codigoautor14277
ipen.contributor.ipenauthorMITIKO SAIKI
ipen.contributor.ipenauthorNICOLE PEREIRA DE LIMA
ipen.date.recebimento19-07
ipen.identifier.fiSem F.I.pt_BR
ipen.identifier.ipendoc25757pt_BR
ipen.type.genreArtigo
relation.isAuthorOfPublication78e9df14-8ccf-4a31-a02f-4a8a4c111c14
relation.isAuthorOfPublication588a3118-cce3-4c6c-8dcc-a1cee1a4a117
relation.isAuthorOfPublication.latestForDiscovery588a3118-cce3-4c6c-8dcc-a1cee1a4a117
sigepi.autor.atividadeSAIKI, M.:1178:320:Npt_BR
sigepi.autor.atividadeLIMA, N.P.:14277:320:Spt_BR
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