Ecological half-lives of 90Sr and 137CS in terrestrial and aquatic ecosystems
Ecological half-lives of 90Sr and 137CS in terrestrial and aquatic ecosystems
复制标题
DOI：
10.1016/j.jenvrad.2006.08.004
复制
发表时间：
2006-01-01
影响因子：
2.3
通讯作者：
Zibold, G.
中科院分区：
文献类型：
--
作者：
Proehl, G.;Ehlken, S.;Zibold, G.
本文描述了Sr-90和（CS）-C-137在食品、饲料和各种环境介质中的长期行为。通过生态半衰期对长期行为进行量化，生态半衰期综合了在特定介质中导致放射性降低的所有过程，如沥滤、固定和侵蚀。已经确定了这些介质中放射性铯和放射性锶浓度的大量长期时间序列，并使用标准化统计程序进行了重新评价，以建立生态半衰期的参考数据集。通过原状土壤和海洋水体的例子，它表明，生态半衰期的概念是值得怀疑的，如果感兴趣的放射性核素在介质内的分布研究是不均匀的，如果在这种介质内的混合和运输过程，因此，是相当重要的观察期间。(c)2006爱思唯尔有限公司版权所有。
This paper describes the long-term behaviour of Sr-90 and (CS)-C-137 in foods, feeds and a variety of environmental media. The long-term behaviour is quantified by means of the ecological half-life which integrates all processes that cause a decrease of activity in a given medium such as leaching, fixation and erosion. A large number of long-term time series of concentrations of radiocaesium and radiostrontium in these media have been identified and re-evaluated using a standardised statistical procedure to establish reference data sets of ecological half-lives. By example of undisturbed soils and marine water bodies it is shown that the ecological half-life concept is questionable if the distribution of the radionuclide of interest within the medium studied is non-uniform and if mixing and transport processes within this medium, therefore, are of considerable importance during the time period of observation. (c) 2006 Elsevier Ltd. All rights reserved.