Abstract
The direct lung monitoring and bioassay of faeces and urine are used to estimate internal exposures of alpha emitting radionuclides.The accuracy of the estimation depends on the retention and clearance model using for calculation of the biological kinetics of nuclides uptaken. The respiratory tract model described in ICRP Publication 30 is the most familiar one using for inhalation intake. The ICRP task group has proposed a new respiratory tract model to be replaced with the current ICRP Publication 30 model.In this article, a comparison of results of retention in the respiratory tract and faecal excretion calculated by the current and new models are described. The retention in the respiratory tract is calculated for 1, 000 days after acute inhalation of 1 Bq of plutonium di-oxide particles. And, the cumulative and daily excretions are calculated for 10 days after inhalation. The retention in parenchyma calculated by the new model is about a half of the current ICRP Publication 30 model. The cumulative faecal excretion in 10 days calculated by the new model is about one-third of the current model.
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