Organically-bound 3H concentration in rice around atomic energy facilities

Health Physics
S HisamatsuY Takizawa

Abstract

Rice samples collected around atomic energy facilities in the Tokai area were analyzed for organically-bound 3H (OBT). Measurement results were compared with those for samples from control areas in Japan and the People's Republic of China. OBT concentrations of rice in the Tokai area were found to be 4 times higher than the control area as maximum. Although this relatively high 3H concentration shows the effect of 3H release from the facilities into the environment, the concentration level is comparable with those in the rice sample from a northern interior region of China. The OBT concentration of rice sample from the general environment in interior China was 4.5 times higher than the control area in Japan. The radiation dose from the increasing 3H level is negligible in comparison with that from natural radiation.

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