浙江省开化县石煤矿区天然放射性水平调查

Investigation of Natural Radioactivity Level in Kaihua County of Kaihua County,Zhejiang

对浙江省开化县石煤矿区展开了地面伽玛辐射剂量率、空气氡浓度、氡析出率的测量,并系统采集了土壤、岩石、石煤、煤渣、矸石、水系沉积物等固体环境介质及水体样品。结果表明,区内伽玛辐射剂量率平均值为205 n Gy/h,远高于浙江省和全国背景值,氡浓度属正常本底水平。γ高值点主要集中在石煤矿山,其他地区放射性水平不高。石煤及煤渣中238U、226Ra、40K比活度均值分别为163. 7、175. 5、1478. 3 Bq/kg及169. 1、188. 9、1387. 1 Bq/kg,虽远高于浙江省土壤背景值,但和浙江其他地区石煤相比,含量仍比较低。受石煤开发影响,矿区内水体总α、总β均值为7. 9、8. 83 Bq/L,远远超过了标准限值,但矿区外围水体影响不大。岩性是控制调查区辐射水平的关键,同时环境因素也对其存在一定影响。

The ground gamma radiation dose rate,air radon concentration and radon exhalation rate were measured in the stone coal mine in Kaihua County,Zhejiang Province.The solid environmental media such as soil,rock,stone coal,cinder,gangue and sediments were collected systematically Water samples.The results show that the average gamma radiation dose rate in the region is 205 nGy / h,much higher than the background value of Zhejiang Province and the whole country,and the radon concentration is a normal background level.γ high value points are mainly concentrated in stone coal mines,radioactive levels in other areas is not high.The specific activities of 238U,226Ra and 40K in stone coal and coal cinder were 163.7,175.5 and 1478.3 Bq / kg,and 169.1,188.9 and 1387.1 Bq / kg respectively,which were much higher than the soil background values in Zhejiang Province.However,Compared to coal,the content is still relatively low.Affected by the development of rock coal,the total α and total β of the water bodies in the mining area are 7.9 and 8.83 Bq / L,far exceeding the standard limits,but the influence of water bodies outside the mining area is not significant.Lithology is the key to controlling the radiation level in the survey area,and environmental factors also have some impact on it.