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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,*. 铀尾矿库区稻田土中放射性核素的空间分布和放射性水平评价[J]. 生态毒理学报, 2018, 13(5): 305-312
铀尾矿库区稻田土中放射性核素的空间分布和放射性水平评价
Spatial Distribution and Radiation Evaluation of the Radionuclides in Paddy Soil of the Uranium Tailings Area
投稿时间:2017-11-24  修订日期:2018-04-23
DOI:10.7524/AJE.1673-5897.20171124001
中文关键词:  尾矿库  放射性核素  比活度  放射性水平
英文关键词:tailings  radionuclides  specific activity  radioactivity level
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)
作者单位
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 
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中文摘要:
      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。
  
AuthorAffiliation
Liu Yuanyuan1,2,4, Zhang Chunyan4, Wei Qianglin3, Guo Yadan4, Gao Bai4, Zhou Weibo1,2,*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
英文摘要:
      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.
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