Implementação de espectrometria alfa para isótopos de uranio e sua aplicação para propósitos de monitoração
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2005
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INTERNATIONAL NUCLEAR ATLANTIC CONFERENCE; ENCONTRO NACIONAL DE APLICACOES NUCLEARES, 7th
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The measurement of radioactivity concentrations in excreta samples is an important tool for the monitoring of
possible radionuclides intakes by occupationally exposed workers. The two methods presently operational at
IPEN-SP/Brazil for monitoring internal contamination to uranium are urine analysis by fluorimetry and alpha
spectrometry [1]. Fluorimetry is the routine monitoring method applied for natural uranium while the alpha
spectrometry is limited for few workers according to their new activities in the uranium processing plant. The
handing of enriched uranium has resulted in an exposure to different types of uranium compounds identified as
Type F, M, S and some of its combination. Therefore, a review of bioassay program applied to uranium workers
has shown the need to optimising alpha spectrometry in consequence of handling both natural uranium and
uranium compounds with different isotopic composition, which could reach up to 20% in 235U. Moreover, a
radiochemical procedure for the determination of uranium isotopes in urine has been optimised, using coprecipitation and ionic exchange resin separation followed by electrodeposition onto stainless steel plates and
alpha-spectrometry [5]. The method with chemical recovery of 85% offers good prospects to be applied for the
routine monitoring of workers. Additionally, investigation and information provided by radiation protection
service about the working conditions as well as the main tasks of the workers were considered valuable to the
evaluation of the monitoring results. Assessment of intake of uranium based on urine assay is likely to be
appreciable in errors under most condition of occupational exposure [2,6,7]. However, urine analysis can be
important for assessing intakes after a known event or when monitoring intervals do not exceed about 3 months.
Urine measurements from IPEN workers were carried out and the interpretation of uranium data in terms of
derived limit and intake were estimated taking into account 19.75% 235U enriched uranium.
Como referenciar
TODO, A.S.; LOVISI, M.I.; CARNEIRO, J.G.C. Implementacao de espectrometria alfa para isotopos de uranio e sua aplicacao para propositos de monitoracao. In: INTERNATIONAL NUCLEAR ATLANTIC CONFERENCE; ENCONTRO NACIONAL DE APLICACOES NUCLEARES, 7th, ago. 28 - set. 2, 2005, Santos, SP. Anais... Disponível em: http://repositorio.ipen.br/handle/123456789/18255. Acesso em: 30 Dec 2025.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.