Environmental mobility of 110mAg: lessons learnt from Fukushima accident (Japan) and potential use for tracking the dispersion of contamination within coastal catchments
Environmental mobility of 110mAg: lessons learnt from Fukushima accident (Japan) and potential use for tracking the dispersion of contamination within coastal catchments
复制标题
DOI：
10.1016/j.jenvrad.2013.12.011
复制
发表时间：
2014-04-01
影响因子：
2.3
通讯作者：
Ayrault, Sophie
中科院分区：
文献类型：
--
作者：
Lepage, Hugo;Evrard, Olivier;Ayrault, Sophie
银-110亚稳态（Ag-110 m）的研究远少于其他人为放射性核素，尽管它有可能在植物和动物组织中积累。核电厂在正常情况下会持续产生三聚氰胺，但在事故情况下会大量排放，便于检测，从而可以调查其在环境中的行为。我们分析了土壤和河流披覆沉积物中的Ag-110 m（即，2011年3月11日发生福岛第一核电站事故后，在受污染的福岛县（日本）沿海集水区收集了沉积在河床砂上的泥帘。进行了几次实地实验，以记录放射性银在陆地环境中的行为，并与更多记录的放射性铯行为进行了系统的比较。结果表明，这两种元素在土壤中具有相似的低流动性，并与粘土组分具有很强的亲和力。对水库中积累的沉积物序列进行的测量往往证实，即使在由于侵蚀和沉积过程而重新分布之后，这些放射性核素也有类似的沉积。因此，由于Ag-110 m：Cs-137初始活性比在整个区域的土壤中变化，我们证明了使用该工具跟踪FDNPP事故产生的主要内陆放射性污染羽流的污染沉积物分散的相关性。(C)2014爱思唯尔有限公司版权所有。
Silver-110 metastable (Ag-110m) has been far less investigated than other anthropogenic radionuclides, although it has the potential to accumulate in plants and animal tissues. It is continuously produced by nuclear power plants in normal conditions, but emitted in much larger quantities in accidental conditions facilitating its detection, which allows the investigation of its behaviour in the environment. We analysed Ag-110m in soil and river drape sediment (i.e., mud drapes deposited on channel-bed sand) collected within coastal catchments contaminated in Fukushima Prefecture (Japan) after the Fukushima Dai-ichi Nuclear Power Plant accident that occurred on 11 March 2011. Several field experiments were conducted to document radiosilver behaviour in the terrestrial environment, with a systematic comparison to the more documented radiocesium behaviour. Results show a similar and low mobility for both elements in soils and a strong affinity with the clay fraction. Measurements conducted on sediment sequences accumulated in reservoirs tend to confirm a comparable deposition of those radionuclides even after their redistribution due to erosion and deposition processes. Therefore, as the Ag-110m:Cs-137 initial activity ratio varied in soils across the area, we justified the relevance of using this tool to track the dispersion of contaminated sediment from the main inland radioactive pollution plume generated by FDNPP accident. (C) 2014 Elsevier Ltd. All rights reserved.