贵州省某磷矿区氡气及放射性水平的评价

目的 研究和评价贵州省某磷矿区磷矿氡气及放射性水平。方法 通过现场检测和实验室分析对磷矿区周围辐射水平、氡气、矿石和土壤核素分析、水的总放射性水平分析。结果 磷矿区的γ外照射为7~18(×10^-8 Gy/h),平均值为12×10^-8Gy/h;氡浓度水平为105~246Bq/m³;矿石²²⁶Ra放射性核素水平为156.7~372.3Bq/kg,平均值为222.6Bq/kg;矿井水总放射性水平最大为总α为0.175Bq/L、总β为0.374Bq/L,饮用水总放射性水平最大为总α为0.0327Bq/L、总β为0.174Bq/L。结论 磷矿放射性水平符合国家相关标准的要求;矿井水和饮用水的总放射性水平相关无显著性意义;井下氡气浓度未达到干预水平。

Evaluation of Radon and Radioactivity Level in Phosphorite Area in Guizhou

Objective To Study and assess atmospheric radon and radioactive levels in one of phosphorite area in Guizhou province.Methods To monitor and analyze the external irradiation level, atmospheric radon, nuclide levels, and water total radioactivity on the spot and in the laboratory.Results External irradiation level is 7~18×10^-8Gy/h, the mean value is 12×10^-8Gy/h, atmospheric radon concentration is 105~246Bq/m³, ore ²²⁶Ra nuclide levels are between 156.7~372.3Bq/kg, the mean value is 222.6Bq/kg.the maximum total radioactivity levels of mine water are total α=0.175Bq/L and total β=0.374Bq/L.the total radioactivity levels of drinking water is not more than total α=0.0327Bq/L, total β=0.174Bq/L.Conclusion Radioactivity levels accord with the relevant national standards.There were remarkable correlation in the total radioactivity levels of mine water and drinking water.The radon concentration in well air is not up to the point of reach intervention level.