Pröhl G, Ehlken S, Fiedler I, Kirchner G, Klemt E, Zibold G
GSF-Research Center for Environment and Health, Institute of Radiation Protection, Ingolstädter Landstr. 1, 85764 Neuherberg, Germany.
J Environ Radioact. 2006;91(1-2):41-72. doi: 10.1016/j.jenvrad.2006.08.004. Epub 2006 Sep 26.
This paper describes the long-term behaviour of (90)Sr and (137)Cs 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.
本文描述了锶-90和铯-137在食物、饲料及各种环境介质中的长期行为。长期行为通过生态半衰期进行量化，生态半衰期整合了导致给定介质中活度降低的所有过程，如淋溶、固定和侵蚀。已识别出这些介质中大量放射性铯和放射性锶浓度的长期时间序列，并使用标准化统计程序进行重新评估，以建立生态半衰期的参考数据集。以未受干扰的土壤和海洋水体为例表明，如果所研究介质中感兴趣的放射性核素分布不均匀，且因此在观察期内该介质中的混合和传输过程相当重要，那么生态半衰期概念是有问题的。
