The aim of this work was to provide an experimental basis for assessing intakes of an industrial actinide-bearing dust from measurements of 60Co and 137Cs in the body or urine. Whilst these radionuclides comprised 72% and 19% of the radioactivity present, greater than 90% of the committed effective dose will result from the low concentrations of the actinides present, 0.4%. To assess the dose coefficient for the dust and predict the biokinetics of 60Co and 137Cs in workers, absorption parameters for transfer from lungs to blood obtained from an animal study were combined with information on particle deposition and clearance from the ICRP human respiratory tract model and with tissue distribution and excretion data from the most recent systemic models. All other radionuclides were assumed to have Type M absorption characteristics. The dose coefficient for the dust, 1.29 · 10-7 Sv · Bq-1 was estimated to contain 113 kBq 60Co, 29 kBq 137Cs and 0.64 kBq of the actinides. The predicted retention and excretion characteristics of 60Co and 137Cs in workers after acute or chronic exposure to the dust suggested that measurements of these radionuclides in the body or urine could detect intakes equivalent to a few percent of an annual dose limit of 20 mSv · y-1.
|Number of pages||8|
|Journal||Journal of Radioanalytical and Nuclear Chemistry Articles|
|Publication status||Published - 1997|