137Cs Concentrations in Northern Alaskan Eskimos, 1962-79

Publisher Website
Google Scholar
Abstract
Concentrations of worldwide fallout 137Cs were measured in the lichen-caribou-Eskimo food chain of northern Alaska during 1962-1979. Pronounced inputs of fallout occurred after major nuclear weapons tests in the atmosphere and 137Cs was transmitted through the food chain to Eskimos with .apprx. 2-yr delay due to environmental parameters. Caribou (Rangifer tarandus) meat sampled during spring harvest contained 4 times the 137Cs concentration of lichens obtained from their winter range. Calculated caribou meat ingestion rates of Anaktuvuk Pass Eskimos during winter ranged from .apprx. 1 kg/day in 1964 to 0.16 kg/day in 1977. Several environmental factors affected seasonal patterns and amounts of 137Cs transferred through the food chain. Maximum 137Cs concentrations of .apprx. 20 nCi/kg body wt in Eskimos occurred in 1964 and have now decreased to .apprx. 0.5 nCi/Kg, largely because of cultural and political factors. Radiation doses from 137Cs body burdens ranged from 60 mrad/yr in 1962 to .apprx. 140 mrad/yr during the 1962-1964 maxima and decreased to 8 mrad/yr in 1979.