Abstract
Assessment of intemal deposition and hence intakes of plutonium due to chronic inhalation of its aerosols, are generally based on interpretation of bioassay urinary measurements with the aid of human respiratory tract models. However, the uncertainties in the estimates of intakes arise due to contributions from previous intakes, non-uniform exposure pattern in the current year and probable presence of transients close to the monitoring time. A comparative study of the evaluation of uncertainties in the estimates of intakes of 239 Pu aerosols of sizes 1 μm and 5 μm AMAD using respiratory tract models of ICRP 30 and 66, is presented here. Similar predictions by the two models of the uncertainties associated with previous intakes as well as non-uniform exposures in the current year are significant results. However, effects of the transients are predicted to be different by the two models for 239 Pu aerosols of I μm but similar for 5 μm AMAD. These results could be utilised to reduce the overall uncertainty in the estimate of an intake. Finally. CEDs per mBq of activity measured in 24 h urine samples have been computed for all the cases and for both the lung models to facilitate assignments of doses to radiation workers.
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