Lung dose conversion factors for emergency bioassay for selected radionuclides

A practical problem in internal dosimetry arises when an individual is accidentally exposed to airborne radioactive materials. Normal procedure would call for urine analysis to establish the presence of any body burden and to permit an assessment of the radiological consequences of this event. Current assessment procedures, based on ICRP 30 methodology, are largely directed to steady-state chronic exposures. This paper presents the procedure for obtaining conversion coefficients on the basis of the ICRP 30 model for the lung doses resulting from singular inhalation events as deduced from measurements on excreta. Tables are presented for the fraction of the annual limit of intake (ALI) represented by unit activity in the excreta as a function of sampling time and the concomitant dose commitments