Cesium-137 Contents in Japanese Diet from 1963 to 1971

概要

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^<137>Cs level in the total diet of Japanese reached the highest peak (107 pCi/day/person) in 1964, and then decreased year by year. The ^<137>Cs level in 1971 was less than 10% of the maximum value in 1964. Daily intake of stable cesium through the total diet has been in the range of 3.9 μg and 25.1 μg. The specific activities (^<137>Cs pCi/mg of stable Cs) of total diet were found to vary among districts. Average ratio of Cs atom to one million atoms of potassium in the diet was 1.7±0.7. Contribution of nine foodstuffs to the total intake of ^<137>Cs was calculated, and that of cereals was the highest and amounted to approximately 40% of the total ^<137>Cs intake. Using (^<137>Cs)-K observed ratio (OR_<human body-totat diet>) for the Japanese adults of 2.35, the cumulative internal radiation dose to the whole body due to ^<137>Cs was estimated to be 7.3 mrads during the 9 years period from 1963 to 1971. ^<137>Cs from nuclear explosions and nuclear facilities has been released into environment since early 1940 s. Some of them have been found in man's food which is the major intake route of ^<137>Cs to man.
日本放射線影響学会の論文