The radioactive cesium (134,137Cs) concentration in brown rice is correlated with that in the straw/husk. The distribution of 134,137Cs, resembles that of potassium (K), a homologous element of Cs, in the rice plant body. The relative isotopic abundance of 40K is 0.0117 %; thus, 1 g K contains 30.4 Bq 40K, and the mass of 4,000 Bq 40K is 0.0154 g, indicating that the K concentration can be calculated from 40K concentration. We examined if the radioactive Cs concentration in brown rice can be estimated from 40K concentrations in straw, and especially might be predicted from the 40K:134,137Cs ratio in straw. We determined the concentrations of 40K and radioactive Cs in straw and brown rice, and found a strong correlated-equation (y = 72.922 x-0.759; r = 0.907) between the radioactive Cs concentration in brown rice and the 40K:134,137Cs ratio in straw. The estimated-radioactive Cs concentration in brown rice can be as much as double, depending on the K nutritional status changing the 40K:134,137Cs ratio in straw. We herein propose a nutritional diagnosis that radioactive Cs concentrations in brown rice can be predicted from the 40K:134,137Cs ratio in shoots.
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