Studies on the Radioactive Contamination of Fruit Trees by Fission Products (4) 90Sr Distribution in Fruit of the Satsuma Orange Trees grown at an Orchard

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The distribution of fallout ^<90>Sr in the skin, juice and residue part of the mature fruit of Satsuma orange trees grown on soils under clean, mulch and sod systems of soil management was investigated for the years from 1961 through 1971. The level of this nuclide in the skin showed a high concentration during the period of heavy fallout deposition followed by a slow exponential decrease with almost the same halftime as that of the replaceable ^<90>Sr content in soil. On the contrary, the level of ^<90>Sr in the juice part was not influenced by the heavy fallout deposition, and the ^<90>Sr content showed almost the same pattern as that of the replaceable ^<90>Sr content in soil between 1961 and 1971. The ratio of the ^<90>Sr content due to direct (surface) absorption including floral absorption to that due to indirect (root) absorption was 7:1 for the skin and 1:6 for the residue in 1963 when heavy fallout deposition was observed. The ratio of ^<90>Sr/Ca in plant tissues to replaceable ^<90>Sr/Ca in soil was also discussed.
日本放射線影響学会の論文