The derivation of radionuclide transfer parameters for and dose-rates to an adult ringed seal (Phoca hispida) in an Arctic environment

Radionuclide transfer parameters and dose-rates for an adult ringed seal from Svalbard have been determined based on empirical and estimated tissue activity concentrations and detailed dietary and habitat information. Whole-body equivalent concentration factors determined for anthropogenic radionuclides ranged from 101 (90Sr) to 102 (137Cs, 238Pu and 239,240Pu), while natural radionuclides ranged from 102 (210Pb) to 104 (210Po). Employing a dietary composition of 40% fish, 40% zooplankton and 20% benthic invertebrates, a whole-body biological half-life of 29 days was derived for 137Cs. A total dose-rate of approximately 0.19 μGy h−1 (1.7 mGy a−1) was derived for an adult ringed seal; this dose-rate is virtually entirely attributable to the internal components of 210Po and 40K. The dose-rates associated with the presence of anthropogenically derived radionuclides in the present assessment fall many orders of magnitude below the dose-rates at which any biological effects would be expected.