Abstract
A method is proposed for performing retrospective determination of the internal irradiation dose to the thyroid gland in man as a result of 131I uptake with fresh cow milk according to the total local 137Cs fallout density resulting from nuclear explosions. It is shown that during local fallout the ratio of the numbers of 131I and 137Cs atoms on particle surfaces is about 0.46 and is independent of the fissioning material (239Pu or 238U) used in the nuclear charge. This makes it possible to determine the fallout density of 131I on soil from the local component of the total 137Cs fallout density. The information about the total 137Cs fallout density on soil is used to calculate the effect of the irradiation dose of 131I to the thyroid gland in children and adults who lived in the populated points in Altai krai during the nuclear tests conducted in the Semipalatinsk test area. The estimates agree satisfactorily with those obtained by a different method.
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