Abstract
Thyroid glands obtained from the instantaneous victims in Tokyo during the period from September to December 1962, when the fallout rate was the highest, were analyzed for the stable iodine. The average concentration was twice as much as the ICRP data (4×10-4 g/g), namely, 0.85 mg/g fresh tissue, ranging from 0.45 to 2.48. The dietary intakes of iodine by Japanese people are suggested as about 300μg on the average with a basic diet containing a minimum of seaweed and incidental consumption of seaweed may lead to a maximum of 10 mg intake. No significant correlation was found between the levels of 131I and stable iodine in the thyroids in this period, probably due to a wide variation of 131I intake among people. The use of ICRP data for Japanese will give a conservative estimate in the exposure calculation.
