江苏省溧阳市放射性水平调查

Radioactivity Investigation in Liyang City,Jiangsu Province

本文给出了2008—2009年江苏省溧阳市地表γ辐射剂量率、大气氡浓度、土壤和岩石中放射性核素水平、水中放射性核素水平的调查测量结果。调查结果表明,溧阳市地表γ辐射剂量率平均为78 nGy/h,溧阳火山盆地的外缘及庙西花岗岩接触带外延γ辐射剂量率较高(最高800 nGy/h);大气氡浓度平均为14.5 Bq/m^3;水中^(238)U、^(232)Th、^(226)Ra、^(40)K和总α、总β水平分别为6 mBq/L、0.085 mBq/L、17.1 mBq/L、212 mBq/L、0.028 Bq/L和0.146 Bq/L。该地区公众人均年本底剂量为1.175 mSv/a。

The measurement results of surface gamma radiation dose rate,atmospheric radon concentration,and natural radionuclide contents in soils/rocks and water in Liyang City,Jiangsu Province,are presented. It indicates that the surface gamma radiation dose rate averages 78 nGy/h,and is above normal in Liyang volcanic basin periphery and the outer reaches of Miaoxi granite contact zone,with a maximum of 800 nGy/h. The mean concentration of atmospheric radon is 14. 5 Bq/m^3. The average content of natural radionuclide contents in soils/rocks is 40K 〉226Ra 〉238U 〉232Th,and 6,0. 085,17. 1 and 212 mBq/L in water,respectively. The total α,total β level in water is 0. 028 and 0. 146 Bq/L. The public dose arising from natural background is 1.175 mSv/a per capita in the region.