ROSA, MYCHELLE M.L.TADDEI, MARIA H.T.CHEBERLE, LUAN T.V.SILVA, PAULO S.C.MAIHARA, VERA A.2018-01-082018-01-08ROSA, MYCHELLE M.L.; TADDEI, MARIA H.T.; CHEBERLE, LUAN T.V.; SILVA, PAULO S.C.; MAIHARA, VERA A. A comparative study using differents resins to determine thorium isotopes. In: INTERNATIONAL NUCLEAR ATLANTIC CONFERENCE, October 22-27, 2017, Belo Horizonte, MG. <b>Proceedings...</b> Rio de Janeiro, RJ: Associação Brasileira de Energia Nuclear, 2017. Disponível em: http://repositorio.ipen.br/handle/123456789/28244.http://repositorio.ipen.br/handle/123456789/28244Thorium is a naturally occurring radioactive element that is widely distributed in the crust of the Earth. This element is very common in mineral formations in regions with high levels of natural radioactivity, therefore, its determination in environmental samples is important. Thorium isotopes (228Th, 230Th, and 232Th) were determined in a reference material, the IAEA Soil 327 sample, to validate the two methods employed using different resins. The initial preparation with acid dissolution is the same to both, in the first is used anion exchange resin (DOWEX 1x2) and electrodeposition in silver planchets. And in the second method is used a specific chromatographic resin (TEVA) and cerium fluoride microprecipitation. At the end both analysis are quantified by alpha spectrometry. The two methods the results obtained were satisfactory for the reference material used, with relative error of less than 4% for 228Th, 230Th, and 232Th. The main differences found between them were spectrums resolutions, time and cost of analysis.openAccessalpha spectroscopycalibration standardscerium fluoridescomparative evaluationselectrodepositionprecipitationresinsthorium isotopesTexto completo de eventohttps://orcid.org/0000-0002-9351-9201