安徽省环境天然贯穿辐射水平调查研究

INVESTIGATION OF ENVIRONMENTAL NATURAL PENETRATING RADIATION LEVEL IN ANHUI PROVINCE

本文报道1987年2—12月安徽省环境天然贯穿辐射剂量水平调查的方法及结果。全省共布设测点777个,其中按25×25km 网格在全省均匀布设的网格点216个,各类加密测点561个。调查测量结果表明:(1)原野天然γ辐射剂量率按测点、按面积和人口的加权平均值分别为5.67、5.62和5.55×10(?)Gy·h^(-1);(2)道路的天然γ辐射剂量率按测点平均为5.38×10^(-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的加权平均值分别为9.59和9.36×10^(-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按人口的加权平均值,室内分别为2.64和2.62×10^(-8)Gy·h^(-1),室外分别为2.95和2.94×10^(-8)Gy·h^(-1);(5)环境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,室内分别为12.23和11.99×10^(-8)Gy·h^(-1),室外分别为8.62和8.49×10^(-8)Gy·h^(-1);(6)天然γ辐射、宇宙射线和环境天然贯穿辐射所致的我省人均年有效剂量当量分别为0.51、0.24、0.75mSv,全省集体年有效剂量当量分别为2.5、1.2和3.7×10~4人·Sv。调查发现原徽州地区炭化砖建筑物室内γ辐射剂量率均值为25.56×10^(-8)Gy·h^(-1),明显高于全省建筑物室内的调查结果,应引起重视。

The methcds and results of the investigation on natural penetrating radiation level in AnhuiProvince in 1987 are presented.21625×25km-netted measuring points were set unformly up all overthe province,with 561 densely measuring points of differen types added.The results show that:(1)The point-weighted,area-weighted and population-weighted average value of natural γradiation doserate for field is 5.67,5.62 and 5.55×10^(-8)Gy·h^(-1),respectively;(2)The point-weighted averagevalue of natural γ radiaton dose rate for road is 5.38×10^(-8)Gy·h^(-1);(3)The point-weighted and pop-ulation-weighted average value of natural γ radiaton dose rate inside buildings is 9.59 and 9.36×10^(-3)Gy·h^(-1),respectively;(4)The point-weighted and population-weighted average value of the dose rateinside buildings from cosmic ray is 2.64 and 2.62×10^(-8)Gy·h^(-1), and outside buildings is 2.95 and2.94×10^(-3)Gy·h^(-1),respectively;(5)The point-weighted and population-weighted average value ofnatural penetrating radiation dose rate inside buildings is 12.23 and 11.99 ×10^(-8)Gy·h^(-1),outsidebuildings is 8.62 and 8.49×10^(-8)GY·h^(-1), respectively;(6)The annual effective dose equivalentfrom natural γ radiation,cosmic ray and natural penetrating radiation is 0.51,0.24,and 0.75 mSv,respectively;and correspondingly,the annual collective effective dose equivalent is 2.5, 1.2 and 3.7×10^(4)man·Sv,respectively.