Radionuclide concentrations in several seaweeds and their annual variations
Radionuclide concentrations in several seaweeds and their annual variations
复制标题
几种海藻中的放射性核素浓度及其年度变化
DOI：
10.1007/bf02037597
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发表时间：
1986
期刊：
影响因子：
--
通讯作者：
Y. Takashima
中科院分区：
文献类型：
--
作者：
N. Momoshima;Y. Takashima
为了检查环境中的放射性核素浓度，自1976年以来，每年在两个不同的地方采集一次海藻。观察到海藻中放射性核素的数量发生了显著变化。放射性核素的增加归因于中国核爆炸试验产生的放射性尘埃的污染。放射性核素浓度强烈依赖于海藻的种类。尽管中国核试验产生了额外的137Cs尘埃，但137Cs/40K活度比仍在逐渐降低。这意味着，与海水中已经含有的137Cs相比，这些爆炸引入海水中的137Cs的量很小。利用海藻中~(137)Cs的比活度和海水中~(137)Cs的浓度来估算海水中铯的含量。直接对海水进行分析，结果与文献报道值吻合较好。
To examine the radionuclide concentrations in the environment, seaweeds were collected once a year since 1976 at two different places. A marked change was observed in the number of radionuclides in seaweeds. The increase of radionuclides is attributed to contamination by radioactive fallout from Chinese nuclear explosion tests. The radionuclide concentrations were strongly dependent on the species of seaweeds. A gradual decrease of the137Cs/40K activity ratio was observed in spite of the input of additional137Cs fallout from Chinese nuclear tests. This implies that the amounts of137Cs introduced into seawater by these detonations were small in comparison with those already contained in seawater. The cesium content in seawater was estimated by using specific activities of137Cs in seaweeds and137Cs concentration in seawater. The results show good agreement with the reported values by direct analysis of seawater.