Abstract
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/m3.The specific activities of 238U,232Th,226Ra,and 40K 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,226Ra,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 urani-um and thorium in liquid environmental samples are 0.057-3.7 and 0.019-0.948 μg/L,respectively.The activity concentrations of 226 Ra,total alpha,and total beta are 2.01-21.9 mBq/L,0.017-0.123 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 μg/L,and the activity concentrations of 226Ra,210Po,and 210Pb are 16.2-1 870,1.35-89.1,2.56-96.8 mBq/L.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.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Key words
ionic rare earth/associated radioactive ore/radiation monitoring/radioactivity/environ-ment impact/effluent分类
资源环境
