Estimation of Dietary Intake of Strontium-90 from Excreta Analysis

概要

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Methods to evaluate the levels of 90Sr in diet from the amounts in excreta were investigated by measuring the levels of 90Sr due to fallout and the contents of stable calcium in diet and excreta. Samples were obtained from 4 volunteers for 7 periods of 5 days each. From the data so obtained, "strontium-calcium observed ratio", (O.R. (urine/diet) and O.R. (feces/ diet)) was calculated. The mean value of O.R. (urine/diet), 0.32, obtained in this study was smaller than those reported by other authors (0.48 and 0.73). However, the mean value of O.R. (feces/diet), 1.32, was in agreement with the reported 1.56. On the other hand, with regard to the ratio of the amount of 90Sr in feces to that in diet, the mean value obtained, 0.67, agreed with the 0.86 of another author. The reasons for the agreement of the O.R. (feces/diet) values and for the disagreement of the O.R. (urine/diet) values are discussed in detail, by considering the ratio of 90Sr (or Ca) in excreta to that in diet. It was concluded that, in evaluating the levels of 90Sr in diet from the amounts in urine or fecal samples, fecal analysis was superior to urine analysis, because the O.R. (feces/diet) as well as the ratio of the 90Sr in feces to that in diet was relatively constant under various conditions.
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