广东省伴生放射性矿资源利用过程辐射水平调查

Investigation of Radiation Levels in Mines Associated with Radioactivity in Guangdong Province

为加强伴生放射性矿物资源开发利过程中放射性环境管理 ,防治放射性污染 ,对广东省几个大型伴生矿(包括稀土矿、钽铌矿和铅锌矿 )资源利用 (开采、冶炼、加工 )过程中天然放射性核素的污染现状进行了调查。调查结果表明 :稀土矿中独居石 ,天然放射性核素含量最高 ,2 3 8U、2 3 2 Th、2 2 6Ra的含量分别为 3.5 1× 1 0 4、1 .74× 1 0 5、4 .8×1 0 4Bq/kg,其冶炼废渣中核素的含量分别为 5 .1 0× 1 0 5、6 .38× 1 0 6、1 .5 2× 1 0 6Bq/kg。稀土选冶厂周围陆地环境 γ射线的空气吸收剂量率比一般地区的高。

Investigation was made of radiation levels in several large-sized mines associated with radioactivy across Guangdong province for the purpose of strengthening environmental radioactivity management and preventing radioactive contamination in the process of extraction and utilization of ores, includig mining, milling and processing. Results indicate that levels of 238 U, 232 Th, 226 Ra are respectively 3.51×10 4,1.74×10 5,4.8×10 4 Bq/kg in monazite, the highest among others,and 5.10×10 5,6.38×10 6,1.52×10 6 Bq/kg in tailings. The γ radiation air absorbed dose rates in the vicinity of rare earths mill are hither than bactground level in common area.