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Beryllium-7, cosmic ray produced radioactivity, its monthly average concentration in the lower atmosphere and monthly fallout rate were measured in Tokai, Japan. Then, the monthly variations were compared with those of fission products due to nuclear detonations in the atmosphere. The concentration of 7Be in the lower atmosphere ranged from 0.5×10-1pCi/m3 to 2.5×10-1pCi/m3 in Tokai between the observed period, 1975-1977. The fallout rate of 7Be vibrated widely, its range was from the detection limits to 1.2×104pCi/m2. The monthly variations were not always the same with variations of the fission products. Fallout rate of 7Be depended on the rain strongly.The concentration of 7Be in the rain was measured, too. Then the range was from 9.2 pCi/l to 1.9×102pCi/l between the observed period 1976. 9-1977. 2.
日本保健物理学会の論文