THE RADIAL-DISTRIBUTION OF SR-90 AND CS-137 IN TREES

被引：40

作者：

MOMOSHIMA, N

BONDIETTI, EA

机构：

[1] Department of Chemistry, Faculty of Science, Kyushu University 33, Higashi-ku, Fukuoka, 812, Hakozaki

[2] Environmental Sciences Division, Oak Ridge National Laboratory, Oak Ridge

来源：

JOURNAL OF ENVIRONMENTAL RADIOACTIVITY | 1994年 / 22卷 / 02期

关键词：

D O I：

10.1016/0265-931X(94)90016-7

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

The distributions of Sr-90 and Cs-137 in tr ee trunks were measured for eight species. The concentration of Cs-137 was relatively uniform in the wood xylem and did not show any correlation with the temporal record of cumulative deposition of fallout in the northern hemisphere, indicating that Cs-137 was mobile in the wood xylem. The distributions of Sr-90 were classified into three groups. All of the gymnosperms - red spruce, eastern hemlock and white pine - showed a maximum Sr-90 specific activity in rings formed in the 1960s and the overall distribution was closely associated with the temporal record of the cumulative deposition of fallout. Three of five angiosperms - hickory, elm and American beech - showed similar distributions to the gymnosperms except that the maximum Sr-90 specific activity corresponded to the 1970s. The other two angiosperms - yellow poplar and sugar maple - did not show any correlation with the cumulative fallout deposition. The radial distribution of Sr-90 in gymnosperms was simulated considering a steady-state cycling of Sr-90 in the forest ecosystem. The model suggested that a few per cent of stable Sr are replaced annually in the nutrient pool of gymnosperms.

引用

页码：93 / 109

页数：17

共 28 条

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