Abstract
Two species of rice, “Uruchi and Mochi” harvested in 1958 and 1959respectively, were analyzed for 90Sr (μμc/kg, SrU=90Srμμc/g Ca). The brown rice was divided into white rice and 5 fractions of the rice bran in course of cleaning time. Rice straw and seed coat of these rice plant harvested in 1959 were also subjected to analysis.
Results were as follows.
1) In all fractions of the rice bran 90Sr concentration, which decreased toward the inner fraction, were higher than that of white rice. This tendency was observed not to be changed, although the amounts of 90Sr in these fractions of rice bran were influ-enced by environmental conditions such as 90Sr conentration in the atmosphere and growingd status.
2) 90Sr was observed to be present in higher amounts in rice straw and seed coat than in the brown rice.
3) When the brown rice was polished enough to be used for food, the 90Sr in the white rice decreased. However, much attention and further study should be needed to decontaminate 90Sr in rice bran and rice straw for using it as cattle feed.
