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Predictions of $^{90}Sr$ and $^{137}Cs$ Concentrations in Rice Seeds and Chinese Cabbage after a Nuclear Accident  

Choi, Yong-Ho (Korea Atomic Energy Research Institute)
Lim, Kwang-Muk (Korea Atomic Energy Research Institute)
Hwang, Won-Tae (Korea Atomic Energy Research Institute)
Lee, Han-Soo (Korea Atomic Energy Research Institute)
Lee, Chang-Woo (Korea Atomic Energy Research Institute)
Publication Information
Journal of Radiation Protection and Research / v.27, no.3, 2002 , pp. 127-146 More about this Journal
Abstract
A method of more realistically, predicting radionuclide concentrations in crop plants varying with time after a nuclear accident was established to estimate 50 years' concentrations of $^{90}Sr$ and $^{137}Cs$ in polished rice seeds and Chinese cabbage for unit dry deposition. After non-growing season accidents, concentrations of both nuclides decreased gradually with time and $^{90}Sr$ concentrations were higher than those of $^{137}Cs$ throughout the whole period. Radionuclide concentrations in the 1 st year after growing season accidents were on the whole higher than those after non-growing season accidents by factors of up to 30 for $^{90}Sr$ and up to 1,000 for $^{137}Cs$. In polished rice seeds, the 50 years-integrated concentration was higher for $^{90}Sr$ than for $^{137}Cs$ after non-growing season accidents, whereas the opposite was true after growing season accidents. In Chinese cabbage. however, it was higher for $^{90}Sr$ than for $^{137}Cs$ after both types of the accident. Generally speaking, the dominant pathway for the integrated concentration after the growing season accident was root uptake for $^{90}Sr$ and direct plant contamination for $^{137}Cs$. The effect of resuspension was negligible. Based on the predicted results. the direct]on of planning countermeasures was suggested for various accident conditions.
Keywords
nuclear accident; polished rice seeds; Chinese cabbage; $^{90}Sr$; $^{137}Cs$; concentration; prediction; countermeasure;
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