刘媛媛;张春艳;魏强林;郭亚丹;高柏;周维博;

• 1:长安大学环境科学与工程学院
• 2:长安大学旱区地下水文与生态效应教育部重点实验室
• 3:东华理工大学水资源与环境工程学院
• 4:东华理工大学放射性地质与勘探技术国防重点学科实验室

摘要(Abstract)：

以我国南方某铀尾矿库下游稻田土壤为研究对象,通过现场取样与室内检测,对土壤中放射性核素238U、226Ra、232Th、40K的比活度进行空间分析。同时采用γ辐射吸收剂量率和年有效剂量法进行土壤环境放射性水平评价,得出土壤中所检测的4种典型核素放射性比活度差异较大。在土壤表层和剖面,226Ra和40K的均值、最大比活度和标准差均较高,232Th和238U较低。而226Ra含量超出当地背景值较多。剖面上4种放射性核素比活度均有随深度降低的趋势,高值出现在土壤浅层,这可能与土壤的有机质含量等有关。综合垂向和平面上的分布特征可知核素232Th、40K的迁移能力比238U、226Ra弱。放射性水平评价结果显示:研究区土壤年有效剂量率平均值小于联合国原子辐射效应科学委员会和全国年有效剂量率的推荐背景值,但是γ辐射吸收剂量率均值高出全国和世界平均水平的3倍。准确定量评价了尾矿库对居民造成的辐射影响,同时为放射性核素在周边稻田植物根系中的迁移机理研究提供基础资料。

关键词(KeyWords)： 尾矿库;放射性核素;比活度;放射性水平

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金(41502235,41362011);; 放射性地质与勘探技术国防重点学科实验室开放基金(RGET1406);; 江西省教育厅科技计划项目(GJJ150596)

作者(Author): 刘媛媛;张春艳;魏强林;郭亚丹;高柏;周维博;

Email:

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