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
刘媛媛;张春艳;魏强林;郭亚丹;高柏;周维博;
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
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;
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DOI:
参考文献(References):
- [1]United Nations Scientific Committee on the Effects of Atomic Radiation.Sources and effects of ionizing radiation:Exposures of the public and workers from various sources of radiation[R].New York:United Nations,2010
- [2]朱欢.核素在包气带中迁移的数值模拟研究[D].西安:长安大学,2010:10-14
- [3]Mayeen U K,Noor L M N,Kh A,et al.Evaluation of radionuclides transfer from soil-to-edible flora and estimation of radiological dose to the Malaysian populace[J].Chemosphere,2016,154:528-536
- [4]宋璐璐,张东,杜良,等.Co在某极地放废物填埋场土壤中的迁移行为初步研究[J].安全与环境学报,2012,12(3):15-18Song L L,Zhang D,Du L,et al.Preliminary study of the migration behavior of Co in the landfill soil of the extremely low-level radioactive waste[J].Journal of Safety and Environment,2012,12(3):15-18(in Chinese)
- [5]刘期凤.241Am在土壤中的吸附及迁移实验研究[D].成都:四川大学,2007:19-30
- [6]史薇,陆继根,王利华,等.田湾核电站周边土壤及植物中137Cs含量调查及人群内辐射风险评价[J].生态毒理学报,2008,3(5):451-456Shi W,Lu J G,Wang L H,et al.137Cs contents in soil and plants after Tianwan Nuclear Power Station(TNPS)Operation and the inner radiation risk assessment[J].Asian Journal of Ecotoxicology,2008,3(5):451-456(in Chinese)
- [7]朱君,邓安嫦,石云峰,等.不同喷淋强度对核素Sr-90在土壤中迁移的影响[J].土壤学报,2017,54(3):785-793Zhu J,Deng A C,Shi Y F,et al.Effect of spraying intensity on migration of Sr-90 in soil[J].Acta Pedologica Sinica,2017,54(3):785-793(in Chinese)
- [8]闫逊.铀尾矿土壤环境放射性核素的浓度分布及其对土壤微生物多样性的影响[D].哈尔滨:东北林业大学,2015:17-20
- [9]马盼军,王哲,易发成,等.某铀尾矿库周边土壤中铀元素的空间分布与污染评价[J].原子能科学技术,2017,51(5):956-960Ma P J,Wang Z,Yi F C,et al.Spatial distribution and pollution assessment of uranium in soil around uranium tailings[J].Atomic Energy Science and Technology,2017,51(5):956-960(in Chinese)
- [10]孔秋梅,冯志刚,马强,等.湖南某铀尾矿库周边土壤外源铀输入机制的研究[J].地球与环境,2017,45(2):135-144Kong Q M,Feng Z G,Ma Q,et al.Input mechanisms of exotic uranium in soils around a uranium mill tailings pond in Hunan Province,China[J].Earth and Environment,2017,45(2):135-144(in Chinese)
- [11]Schlenker S,Degering D,Unterricker S,et al.Distribution of radionuclides in forest soils of varying pedochemistry[J].Radiation Physics and Chemistry,2001,61:705-706
- [12]Hancocka G R,Grabhama M K,Martin P,et al.Amethodology for the assessment of rehabilitation success of post mining landscapes-sediment and radionuclide transport at the former Nabarlek uranium mine,Northern Territory,Australia[J].Science of the Total Environment,2006,354:103-119
- [13]Thorring H,Skuterud L,Steinnes E.Influence of chemical composition of precipitation on migration of radioactive cesium in natural soils[J].Journal of Environmental Radioactivity,2014,134:114-119
- [14]中华人民共和国国家质量监督检验检疫总局.中国国家标准化管理委员会.GB/T 11743-2013土壤中放射性核素的γ能谱分析方法[S].北京:中国标准出版社,2014
- [15]Yan J H,Gui Y G,Yi H,et al.A comparative study of terrestrial gamma dose rate in air measured by thermoluminescent dosimeter,portable survey meter and HPGe gamma spectrometer[J].Journal of Environmental Radioactivity,2016,164:13-18
- [16]United Nations Scientific Committee on the Effects of A-tomic Radiation(UNSCEAR).Sources and effects of ionizing radiation[R].New York:United Nations,2000:32
- [17]Seeley F G.Problem in the separation of Ra from uranium ore tailings[J].Hydrometallurgy,1977(2):249
- [18]何纪力,徐光炎.江西省土壤环境背景值研究[M].北京:中国环境科学出版社,2006:57-59
- [19]马腾,王焰新.放射性核素在地下介质中迁移机理与模型研究[J].地质科技情报,2000,19(2):78-82Ma T,Wang Y X.Mechanism and models on migration of radionuclides in subsurface media[J].Geological Science and Technology Information,2000,19(2):78-82(in Chinese)
- [20]潘自强,郭明强,崔广志,等.中国天然辐射本底水平和居民剂量估算[J].辐射防护,1992,12(4):251-259Pan Z Q,Guo M Q,Cui G Z,et al.Estimation of natural radiation background level and population dose in China[J].Radiation Protection,1992,12(4):251-259(in Chinese)
- [21]United Nations Scientific Committee on the Effects of A-tomic Radiation.Sources and effects of ionizing radiation.annex A:Exposure from natural sources of radiation[R].New York:United Nations,1993:42