贵州省某铝矿区放射性水平的研究和评价  

Study and Assess on Radioactivity Level of Aluminum Mine in Guizhou.

作　　者：李舟[1] 杨忠[1] 张小乐[1] 

机构地区：[1]贵州省疾病预防控制中心,贵州贵阳550004

出　　处：《中国辐射卫生》2007年第4期397-398,共2页Chinese Journal of Radiological Health

基　　金：国家科技部社会公益研究项目子项目(2005DIB1Z087)

摘　　要：目的研究和评价贵州省某铝矿区放射性水平。方法对铝矿开采面及矿区周围地表、土壤辐射水平进行测量；对地下铝矿氡气、钍气浓度进行累积检测；实验室对铝矿石、矿区周围土壤进行核素分析。结果铝矿区的1外照射为（8—36）×10^-8Gy／h，平均值（21．7±3．9）×10^-8Gy／h。地下铝矿开采面γ外照射为（77—99）×10^-8Gy／h．平均值（87．0±8．1）×10^-8Gy／h；氡浓度水平为73．3—208．0Bq／m^3，钍浓度水平为57．2—349．0Bq／m^3；铝矿放射性核素^226Ra为438．6～511．9Bq／kg、^232Th为454．3—536．7Bq／kg、^40K为小于探测下限-363．9Bq／kg。结论此次调查的地下铝矿，采用机械和自然相结合的通风方式，通风情况较好，故所测量的氡浓度未达到干预水平。而地下开采面γ天然辐射，明显高于贵州省γ天然辐射平均值，按采矿工人每年工作2400h计算，将对该矿的矿工增加约2．09mSv／a的附加剂量。Objective To research and assess radioactivity level in one of aluminum mine, Guizhou province. Methods Measure radiation levels in well, out earth surface and soil, accumulatirely detect radon and thorium gas, analyze content of radionuclide in ore and soil in Lab. Results External irradiation level in aluminum mine area is （8 -36） × 10^-8 Gy/h, mean is（21.7±3.9）× 10^-8Gy/h. External irradiation tevel in well is （77 -99）× 10^-8Gy/h, mean is（87.0 ±8.1 ）× 10^-8Gy/h. Radon concentration is 73.3 - 208.0Bq/m^3 ,Thorium concentration is 57.2 - 349.0Bq/m^3 , ^226Ra in aluminum ore is between 438.6 and 511.9Bq/kg,^232Th is between 454.3 and 536.7 Bq/kg,^40K is between LLD and 363.9 Bq/kg. Conclusion Natural and mechanical ventilation is used in the underground aluminum mine, due to the good ventilation condition. Radon concentration is the intervention level. However, the γ natural radiation in working face is evidently higher than the average value in Guizhou province, adding 2.09mSv/a extra radiation dose to workers working suppose for up to the 2 400 hours per year.

关 键 词：铝矿 γ天然辐射 放射性核素 氡评价 

分 类 号：X591[环境科学与工程—环境工程]