Ecological half-life Of 137Cs in lichens in an alpine region
Ecological half-life Of 137Cs in lichens in an alpine region
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DOI：
10.1016/j.jenvrad.2007.05.003
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发表时间：
2007-01-01
影响因子：
2.3
通讯作者：
Steger, Ferdinand
中科院分区：
文献类型：
--
作者：
Machart, Peter;Hofmann, Werner;Steger, Ferdinand
切尔诺贝利事故发生约17年后，在奥地利的一个高山地区（巴德加斯坦）收集了地衣样本，该地区受到切尔诺贝利放射性尘埃的严重污染。根据地衣种类和取样地点的不同，在选定的地衣（冰岛鸢尾、僧帽鸢尾和枝石蕊）中测得的Cs-137放射性浓度范围为100至1100 Bq/kg（-1）干重。通过与同一地点相同地衣物种的早期测量结果进行比较，获得了不同地衣样本中（CS）-C-137的生态半衰期，范围为2至6年，平均值为3至4年。与早期研究的比较表明，在过去10年中，生态半衰期几乎没有变化，这表明生态清除机制（如冲刷或土壤转移）在选定的采样区没有很大的变化。(c)2007爱思唯尔有限公司保留所有权利。
About 17 years after the Chernobyl accident, lichen samples were collected in an alpine region in Austria (Bad Gastein), which was heavily contaminated by the Chernobyl fallout. Measured Cs-137 activity concentrations in selected lichens (Cetraria islandica, Cetraria cucullata, and Cladonia arbuscula) ranged from 100 to 1100 Bq kg(-1) dry weight, depending on lichen species and sampling site. Ecological half-lives for (CS)-C-137 in different lichen samples, obtained by comparison with earlier measurements of the same lichen species at the same site, ranged from 2 to 6 years, with average values between 3 and 4 years. Comparison with earlier studies indicated that ecological half-lives hardly changed during the last 10 years, suggesting that ecological clearance mechanisms (e.g. washout or soil transfer) did not vary substantially at the selected sampling area. (c) 2007 Elsevier Ltd. All rights reserved.