Better understanding of the environmental transfer of radionuclides will improve estimates of radiation doses that can be received by wildlife
from radionuclide releases. It will also help to reduce the uncertainties associated with environmental impact assessments.
In order to estimate radionuclide uptake by wildlife, researchers often use simplified compartmental models. A commonly used compartmental model for radiological assessments of terrestrial wildlife is the whole-organism to soil concentration ratio (CRwo-soil). The CRwo-soil is the equilibrium ratio of radionuclide activity concentration in a whole-organism to the radionuclide concentration in soil.
After the accident at the Fukushima-Daiichi in 2011, large amounts of radionuclides were despersed in the environment. Radionuclide concentrations in wild rodents (Apodemus argenteus, and Apodemus speciosus) within several study areas at Fukushima were monitored from 2012 to 2016. However, whole- organism to soil transfer parameters for wild rodents at Fukushima were not determined and hence were lacking from the international transfer databases.
New paper presents the largest reported data set for concentration ratios for Reference Rat-Cs from Fukushima-Daiichi NPP contaminated sites as well as estimated doses to wild rodents.
Anderson, D., Beresford, N. A., Ishiniwa, H., Onuma, M., Nanba, K., & Hinton, T. G. (2021). Radiocesium concentration ratios and radiation dose to wild rodents in Fukushima Prefecture. Journal of Environmental Radioactivity, 226, 106457. doi:https://doi.org/10.1016/j.jenvrad.2020.106457