摘要
本文主要报道1983—1990年间国家环保局组织的、以摸清环境天然陆地γ辐射现状水平和分布为主要目的的中国环境天然贯穿辐射水平调查的方法及其结果。在全国基本以25×25km网格均匀布点,并在核企业、伴生矿和可能存在人工污染源等地的周围加密布点;共布设网格点14762个(其中25×25 km 和50×50 km 的网格点共8805个),各类加密点计14112个,总计测点数为28874个。由8805个网格点的调查结果统计而得的主要结果为:(1)原野γ辐射剂量率(均指离地面1 m 高处空气吸收剂量率,下同)范围为(2.4—340.8)nGy/h,按面积和人口加权的均值(±单次测量标准差)分别为62.8(±31.2)和62.1(±27.4)nGy/h。(2)道路γ辐射剂量率范围为(3.0—399.1)nGy/h,按点平均值和标准差分别为61.8和21.5nGy/h;道路与原野γ辐射剂量率比值的平均值为0.98。(3)室内γ辐射剂量率范围为(11.0—418.5)nGy/h,按人口加权均值和标准差分别为99.1和36.4nGy/h;室内与原野的γ辐射剂量率比值的平均值为1.64。(4)宇宙射线剂量率(不包括中子贡献),室外范围为(26.7—189.3)nGy/h,按点和按人口加权均值(±单次测量标准差)分别为39.9(±6.5)和32.5(±3.6)nGy/h;室内的范围为(10.0—165.8)nGy/h,按点和按人口加权均值(±单次测量标准差)分别为35.4(±5.3)
The paper reports the method and main results of investigation on environmental naturalpenetrating radiation levels in China,which was organized by the National Environmental ProtectionAgency,and mainly aimed at making certain of the current levels and distribution of environmentalterrestrial γ radiation in Chirna.The measuring points were set up uniformly according to 25×25 kmnet grid in the whole country,and do densely around nuclear facilities,radioactive mines as well as oth-er contamination sources.There are 14762 net grid measuring points（among which 8805 points are 25×25 km and 50×50 km-netted points）,14112 dense measuring points of different types and total28874 measuring points.The main results counted from 8805 netted measuring points show that:（1）The range of natural γ radiation dose rate over field is（2.4—340.8） nGy·h<sup>-1</sup>,area-weightedand population-weighted average value（±standard deriation for single measuring）is 62.8（±31.2）and 62.1（±27.4）nGy·h<sup>-1</sup> respectively.（2）The range of natural γ radiation dose rate over roads is（3.0—399.1）nGy·h<sup>-1</sup>,the point-weighted average value and standard deviation is 61.8 and 21.5 nGy·h<sup>-1</sup> respectively.Theaverage value of ratio of the natural γ radiation dose rate for road versus field is 0.98.（3）The range of natural γ radiation dose rate inside buildings is（11.0—418.5）nGy·h<sup>-1</sup>,thepopulation-weighted average value and standard deviation is 99.1 and 36.4 nGy·h<sup>-1</sup> respec-tively.The average value of ratio of the natural γ radiation dose rate for indoor versus field is 1.64.（4）The range of outdoor air absorbed dose rate caused by ionization components of cosmic rays is （26.7—189.3）nGy·h<sup>-1</sup>,and the point-weighted and population-weighted average value（±standard deviation for single measuring）is 39.9（±6.5）and 32.5（±3.6）nGy·h<sup>-1</sup> respec-tively;the range for indoor is（10.0—165.8）nGy·h<sup>-1</sup> and the p
出处
《辐射防护》
CAS
CSCD
北大核心
1992年第2期96-121,共26页
Radiation Protection
关键词
放射性
环境
天然贯穿辐射
中国
Environment
Natural Penetrating Radiation
Terrestrial γ Radiation
Level
Investigation
Chia
