摘要
为掌握离子型稀土矿分离企业周边的放射性水平及其变化趋势,评估冶炼分离过程对周边环境的潜在影响,以广西某典型稀土分离企业为对象,在2017—2024年期间,连续8年系统监测企业周边环境,获取了时空分布数据,掌握了企业周围辐射环境的动态特征及变化趋势。企业周边γ剂量率最大值为10^(4)nGy/h,氡浓度最大值为69.0 Bq/m^(3);固态环境样品中^(238)U、^(232)Th、^(226)Ra、^(40)K比活度分别为36.8~88.9、28.9~180、27.7~107、452~479 Bq/kg;气态环境样品中^(238)U、^(232)Th、^(226)Ra、^(40)K比活度分别为<29.8、<6.95~27.6、<6.28~27.6、<19.3~33.5 Bq/kg;液态环境样品中铀、钍质量浓度分别为0.057~3.7、0.019~0.948μg/L,^(226)Ra、总α、总β活度浓度分别为2.01~21.9 mBq/L、0.017~0.123 Bq/L、0.027~0.099 mBq/L;液态流出物样品中U、Th总量为0.241~168μg/L,^(226)Ra、^(210)Po、^(210)Pb活度浓度为16.2~1870、1.35~89.1、2.56~96.8 mBq/L。结果表明,2017—2024年,该离子型稀土分离企业周围环境γ辐射剂量率、氡浓度水平、地表水、地下水、气溶胶、土壤、底泥的放射性指标基本符合标准要求,企业周边辐射环境总体稳定,部分指标的明显波动与污水处理工艺调整密切相关。
In order to grasp the radioactive level and its changing trend around the ionic rare earth ore separation enterprise,and evaluate the potential impact of smelting separation process on the sur rounding environment,this study takes a typical rare earth separation enterprise in Guangxi as an ex ample.From 2017 to 2024,a systematic tracking and monitoring was carried out for 8 consecutive years,and the spatial and temporal distribution data of the radiation environment were obtained,and the dynamic characteristics and changing trends of the radiation environment around the enterprise were grasped.The maximum gamma dose rate around the enterprise is 104 nGy/h,and the maximum radon concentration is 69.0 Bq/m^(3).The specific activities of^(238)U,^(232)Th,^(226)Ra and^(40)in solid state environmental samples are 36.8-88.9,28.9-180,27.7-107 Bq/kg,and 452-479 Bq/kg,respectively.The specific activities of^(238)U,^(232)Th,^(226)Ra and^(40)K in gaseous environmental samples are<29.8,<6.95-27.6,<6.28-27.6,and<19.3-33.5 Bq/kg,respectively.The mass concentrations of uranium and thorium in liquid environmental samples are 0.057-3.7 and 0.019-0.948 pg/L,respectively The activity concentrations of^(226)Ra,total alpha,and total beta are 2.01-21.9 mBq/L,0.0170.123 Bq/L,and 0.027-0.099 mBq/L,respectively.The total amount of U and Th in the liquid efflu ent sample is 0.241-168 pug/L,and the activity concentrations of^(226)Ra,^(210)Po,and^(210)Pb are 16.2-1870,1.35-89.1,2.56-96.8 mBq/1L.According to the analysis of monitoring results,from 2017 to 2024,the gamma radiation dose rate and radon concentration level in the surrounding environment of the ion type rare earth separation enterprise,as well as the radioactive indicators of surface water,groundwater,aerosols,soil,and sediment,basically meet the standard requirements.The overall ra diation environment around the enterprise is stable,and the obvious fluctuations in some indicators are closely related to the adjustment of sewage treatment processes.The results provide a reliable refer ence for the radiation environment management of associated radioactive mining enterprises.
作者
彭文斌
向辉云
林明媚
林晨
江岳
黄彬丽
PENG Wenbin;XIANG Huiyun;LIN Mingmei;LIN Chen;JIANG Yue;HUANG Binli(Radiation Environment Management and Monitoring Station of Guangxi Zhuang Autonomous Region,Nanning 530222,China)
出处
《铀矿冶》
2026年第1期154-162,共9页
Uranium Mining and Metallurgy
关键词
离子型稀土
伴生放射性矿
辐射监测
放射性
环境影响
流出物
ionic rare earth
associated radioactive ore
radiation monitoring
radioactivity
environment impact
effluent
