刘媛媛^1,2,4,
张春艳⁴,
魏强林³,
郭亚丹⁴,
高柏⁴,
周维博^1,2,,
1. 长安大学环境科学与工程学院, 西安 710054;
2. 长安大学旱区地下水文与生态效应教育部重点实验室, 西安 710054;
3. 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, 南昌 330013;
4. 东华理工大学水资源与环境工程学院, 南昌 330013

作者简介: 刘媛媛(1986-),女,讲师,博士研究生,研究方向为地下水污染控制,E-mail:liuyuanyuan@ecit.cn.

通讯作者: 周维博,zwbzyz823@163.com

基金项目: 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)


中图分类号: X171.5

Spatial Distribution and Radiation Evaluation of the Radionuclides in Paddy Soil of the Uranium Tailings Area

Liu Yuanyuan^1,2,4,
Zhang Chunyan⁴,
Wei Qianglin³,
Guo Yadan⁴,
Gao Bai⁴,
Zhou Weibo^1,2,,
1. College of Environmental Science and Engineering, Chang'an University, Xi'an 710054, China;
2. Key Laboratory of Subsurface Hydrology and Ecological Effect in Arid Region of Ministry of Education, Chang'an University, Xi'an 710054, China;
3. Fundamental Science on Radioactive Geology and Exploration Technology Laboratory, East China University of Technology, Nanchang 330013, China;
4. School of Water Resource and Environmental Engineering, East China University of Technology, Nanchang 330013, China

Corresponding author: Zhou Weibo,zwbzyz823@163.com

CLC number: X171.5

-->

摘要
HTML全文
图(0)表(0)
参考文献(0)
相关文章
施引文献
资源附件(0)
访问统计

摘要: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: 尾矿库/
放射性核素/
比活度/
放射性水平

Abstract:The specific activity of radionuclide ²³⁸U, ²²⁶Ra, ²³²Th and ⁴⁰K in the soil was analyzed by field sampling and laboratory test, taking the paddy soil in the lower reaches of a uranium tailings reservoir in the south of China as the research object. Meanwhile, the soil environmental radioactivity was evaluated by γ-radiation absorbed dose rate and annual effective dose method. It was concluded that the specific radioactivity of the four typical nuclides detected in the soil was quite different. There are higher values, maximum specific activities and standard deviations at ²²⁶Ra and ⁴⁰K in soil surface and profile, while ²³²Th and ²³⁸U are lower in these areas. Besides, the content of ²²⁶Ra was higher than the local background value. Four specific activity of the radionuclides in the profile decreased with the depth, and the high values appeared in the shallow layer of the soil, which may be related to the content of organic matter in the soil. Combined with the vertical and plane distribution characteristics, the migration ability of nuclide ²³²Th and ⁴⁰K are weaker than that of ²³⁸U and ²²⁶Ra. The results of radioactivity level evaluation show that the average annual effective dose rate of soil in the study area is less than the recommended background value of the UNSCEAR and the National annual effective value, while the average dose rate of γ-radiation absorption is three times higher than the national and world average. It accurately and quantitatively evaluates the radiation effect of tailing pool on residents and provides basic data for the study of radionuclide migration mechanism in the surrounding rice field plant roots.
Key words:tailings/
radionuclides/
specific activity/
radioactivity level.