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1、doi:10.3969/j.issn.1007-7545.2018.11.015基于γ能谱的某铀尾矿库和水冶厂周边水体放射性分布特征及风险评估罗旭佳1,2,魏强林1,2,刘义保1,2,杨波2,吴和喜2,洪加标2(1.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;2.东华理工大学核科学与工程学院,南昌330013)摘要:通过高纯锗γ谱仪精确测量了我国某铀尾矿库和水冶厂排放水及周边地表水中天然放射性核素238U、226Ra、232Th和40K的放射性浓度,得出其分布特征及其对周边环境的影响和给附近居民健康带来的风险。结果表明
2、,尾矿库渗滤水和水冶厂排放水中238U、226Ra、232Th和40K含量相比其内部存储液有明显降低,尾矿库渗滤水中总铀含量为0.23mg/L,226Ra比活度为0.68Bq/L,均低于国标GB23727-2009规定限值;水冶厂排放水中总铀含量为1.37mg/L,226Ra比活度为1.37Bq/L,均高于国标规定限值。若将尾矿库中下游居民区水渠中水和水冶厂入溪后水作为饮用水,则238U、226Ra和232Th对人体所致总待积有效剂量分别为0.1875和0.1214mSv/a,均已超过世界卫生组织饮用水水质准则推荐值。对比本地本底值发现,研究区
3、域地表水已被污染。关键词:铀尾矿库;水冶厂;伽马能谱;总待积有效剂量;健康评价中图分类号:TL942+.1;TL75+1文献标志码:A文章编号:1007-7545(2018)11-0000-00RadioactivityDistributionCharacteristicsandRiskAssessmentofWaterSurroundingUraniumTailingandMillBasedonGammaSpectrumLUOXu-jia1,2,WEIQiang-lin1,2,LIUYi-bao1,2,YANGBo2,WUHe-xi2,HON
4、GJia-biao2(1.FundamentalScienceonRadioactiveGeologyandExplorationTechnologyLaboratory,EastChinaUniversityofTechnology,Nanchang330013,China;2.SchoolofNuclearScienceandEngineering,EastChinaUniversityofTechnology,Nanchang330013,China)Abstract:BasedonHigh-PurityGermaniumGammaSpe
5、ctrometer,radioactiveconcentrationsofnaturalradionuclides238U,226Ra,232Thand40Kindischargedwaterandsurroundingsurfacewaterofuraniumtailingandmillwereaccuratelymeasuredtoinvestigatepollutiontoexternalenvironmentandrisktohealthofnearbyresidents.Theresultsshowthatcontentsof238U
6、,226Ra,232Thand40Kinpercolatingwateroftailinganddischargedwaterofmillaresignificantlylowerthanthoseininternalwater,thetotaluraniumcontentinpercolatingwateroftailingis0.23mg/Landthespecificactivityof226Rais0.68Bq/L,bothofwhicharelowerthanthenationalstandard(GB23727-2009).Thet
7、otaluraniumcontentofwaterdischargedfromthemillis1.37mg/L,andthespecificactivityof226Rais1.37Bq/L,bothofwhicharehigherthanthenationalstandard.Ifthewaterinmiddleandlowerreachesofthetailingcanalsandthewaterfromthemillwhichenteredtheriverinresidentialareaareusedasdrinkingwater,t
8、hetotalcommittedeffectivedoseof238U,226Raand232Thtohumanis0.1875and0.1214mS