江苏省环境天然贯穿辐射水平调查研究

INVESTIGATION OF ENVIRONMENTAL NATURAL PENETRATING RADIATION LEVEL IN JIANGSU PROVINCE

本文报道了江苏省环境天然贯穿辐射水平调查的方法和结果。全省以25 km×25 km 网格均匀布点,共布设网格点182个,城镇人口加密点236个,特殊点21个。调查结果表明:(1)江苏省原野γ辐射剂量率按面积、人口和网格点(以下简称测点)的加权均值分别为50.3、50.6和50.4nGy·h^(-1);(2)道路γ辐射剂量率按测点平均值为47.1 nGy·h^(-1);(3)室内γ辐射剂量率按人口和测点加权均值分别为89.7和89.2 nGy·h^(-1);(4)宇宙射线电离成分(不包括中子)所致空气吸收剂量率按测点和人口加权均值,室内分别为26.0和25.8 nGy·h^(-1),室外分别为29.2和29.1nGy·h^(-1);(5)天然贯穿辐射剂量率,按测点和人口加权均值,室内分别为115.1和115.5nGy·h^(-1),室外分别为79.5和79.7 nGy·h^(-1);(6)宇宙射线、天然γ辐射和天然贯穿辐射所致居民人均年有效剂量当量分别为0.23、0.48和0.71 mSv;所致集体年有效剂量当量分别为3.0、1.5和4.5×10~4人·Sv。

The methods and results of the investigation on natural penetrating radiation level in JiangsuProvince are presented.182 25 km×25 km-grid measuringpoints were set uniformly up all over theprovince,with 236 densely measuring points of different types added.The results show that:(1)Thearea-weighted,population-weighted and point-weighted average value of natural γ radiation dose ratefor field is 50.3,50.6 and 50.4 nGy·h^(-1),respectively;(2)The point-weighted average value ofnatural γ radiaton dose rate for road is 47.1 nGy·h(-1);(3)The population-weighted and point-weighted average value of natural γ radiaton dose rate inside buildings is 89.7 and 89.2 nGy·h^(-1),respeetively;(4)The point-weighted and population-weighted average value of the dose rate insidebuildings from cosmic ray is 26.0 and 25.8 nGy·h^(-1),and outside buildings is 29.2 and 29.1nGy·h^(-1),respectively;(5)The point-weighted and population-weighted average value of naturalpenetrating radiation dose rate inside buildings is 115.1 and 115.5 nGy·h^(-1),outside buildings is 79.5 and 79.7 nGy·h^(-1),respectively;(6)The annual effective dose equivalent from cosmic ray,natural γ radiation and natural penetrating radiation is 0.23,0.48 and 0.71 mSv,respectively;andcorrespondingly,the annual collective effective dose equivalent is 3.0,1.5 and 4.5×10~4 man·Sv,resoectively.