河南省环境天然贯穿辐射水平调查研究

INVESTIGATION OF ENVIRONMENTAL NATURAL PENETRATING RADIATION LEVEL IN HENAN PROVINCE

本文报道了河南省环境天然贯穿辐射剂量水平的调查方法及其结果。全省以25×25 km 网格均匀布点,共布设网格点259个,各类加密测点351个。结果表明:(1)原野γ辐射剂量率按测点、按面积和按人口加权的平均值分别为6.14、6.13和5.84×10^(-8)Gy·h^(-1);(2)道路γ辐射剂量率按测点平均为5.60×10^(-8)Gy·h^(-1);(3)建筑物室内天然γ辐射剂量率按测点和按人口加权的平均值分别为9.68和9.53×10^(-8)Gy·h^(-1);(4)宇宙射线电离成分所致空气吸收剂量率按测点和人口加权的平均值,室外分别为3.02和2.98×10^(-8)Gy.h^(-1),室内分别为2.72和2.68×10^(-8)Gy·h^(-1)(5)天然贯穿辐射剂量率(不包括中子成分)按测点和按人口加权的平均值,室外分别为9.16和8.82×10^(-8)Gy·h^(-1),室内分别为12.39和12.21×10^(-8)Gy·h^(-1);(6)天然γ辐射、宇宙射线和天然贯穿辐射所致的我省人均年有效剂量当量分别为0.52、0.24和0.76mSv,所致集体年有效剂量当量分别为3.88、1.80和5.68×10~4人·Sv。

The methods and results of the investigation on natural penetrating radiation level in HenanProvince from 1985 to 1987 are presented.259 25×25 km-grid measuring points were set unformlyup all over the province,with 351 densely measuring points of differen types added.The results showthat:(1)The point-weighted,area-weighted and population-weighted average value of natural γ radia-tion dose rate for field is 6.14,6.13 and 5.84×10^(-8)Gy·h^(-1),respectively;(2)The point-weightedaverage value of natural γ radiaton dose rate for road is 5.60×10^(-8)Gy·h^(-1);(3)The point-weightedand population-weighted average value of natural γ radiaton dose rate inside buildings is 9.68 and9.53×10^(-8)Gy·h^(-1),respectively;(4)The point-weighted and population-weighted average value ofthe dose rate inside buildings from cosmic ray is 2.72 and 2.68×10^(-8)Gy·h^(-1),and outside buildingsis 3.02 and 2.98×10^(-8)Gy·h^(-1),respectively;(5)The point-weighted and population-weighted aver-age value of natural penetrating radiation dose rate inside buildings is 12.39 and 12.21×10^(-8)Gy·h^(-1),outside buildings is 9.16 and 8. 82×10^(-8)Gy·h^(-1),respectively;(6)The annual effective doseequivalent from natural γ radiation,cosmic ray and natural penetrating radiation is 0.52,0.24 and0.76 mSv,respectively;and correspondingly,the annual collective effective dose equivalent is 3.88,1.80 and 5.68×10~4 man·Sv,respectively.