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The world population has been exposed to fallout plutonium from nuclear tests. About 320kCi of 239+240Pu was deposited on the earth for the period from 1945 to 1973.In this work, the organ burden and the dose to man have been estimated by using the measured airborne 239+240Pu concentration from 1954 to 1980 in Tokyo and Ibaraki. The model for the respiratory system developed by the ICRP Task Group on Lung Dynamics and the "source-target method" were used to calculate the burden and the dose.The burden in the organs of the reference man exposed to airborne 239+240Pu was estimated to be 0.028pCi in lung, 0.16pCi in lymph node, 0.51pCi in liver, 0.58pCi in bone and 0.00049pCi in testes, respectively at the end of 1980 based on the assumption that the Activity Median Aerodynamic Diameter (AMAD) was 0.4μm and the solubility class was Y. On the same assumption, the cumulative dose from 1954 to 1980 was 18mrem to lung, 760mrem to lymph node, 8.5mrem to liver, 2.7mrem to red marrow, 38mrem to endosteal surface and 0.39mrem to testes, respectively, and the effective dose was 5.6mrem.The burden and the dose for other cases of the AMAD and the solubility class have also been estimated.
- 日本保健物理学会の論文
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