Methodology for monitoring the residual activity in silicon rods irradiated with thermal neutrons
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Applied Radiation and Isotopes
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Resumo
A calibrated detection system developed for monitoring the residual activity in silicon rods irradiated for neutron
transmutation doping is described. This residual activity is mainly due to 31Si and 32P, produced by thermal neutron
capture reactions. The set-up consists of a scanning device, developed for positioning the rods, coupled to a GM
detector for measuring b-rays coming from the rod. The set-up has been calibrated using a 32P aqueous solution
standardised in a 4pb gas-flow proportional counter system. The validity of the experimental procedure has been
checked by Monte Carlo calculations. An additional check has been made by measuring the residual activity of a silicon
rod irradiated in a well-known neutron fluence and the formalism used for calculating the activity on the basis of
irradiation parameters is given. The results are compared to the radiological limit imposed by IAEA regulations in
order to consider the material as exempt before it could be released for industrial applications.
Como referenciar
DIAS, M.S.; SEBASTIAO, J.R.; KOSKINAS, M.F. Methodology for monitoring the residual activity in silicon rods irradiated with thermal neutrons. Applied Radiation and Isotopes, v. 57, n. 6, p. 801-804, 2002. DOI: 10.1016/S0969-8043(02)00195-1. Disponível em: http://repositorio.ipen.br/handle/123456789/7379. Acesso em: 20 Mar 2026.
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.