北京环境辐射水平现状与分布  

Current Level and Distribution of Environmental Radiation in Beijing

作　　者：章文英[1] 吴增新[1] 郑汝宽[1] 

机构地区：[1]北京市环境保护科学研究所,北京100037

出　　处：《环境科学》1993年第6期16-19,共4页Environmental Science

摘　　要：在北京市按网格布点调研了环境辐射水平。北京原野γ辐射及宇宙射线室外剂量率按网点加权均值分别为56.2及32.3nGy·h^(-1),全市土壤中^(238)U、^(232)Th、^(226)Ra、^(40)K及^(137)Cs含量按面积加权均值分别为19.4、34.1、21.4、622及8.3Bq·kg^(-1),各类水体水中U、Th及^(226)Ra、^(40)K浓度范围分别是0.12—8.94、0.02—0.66μg·L^(-1)及6.0—98.1、19.2—643 mBq·L^(-1)。北京环境辐射水平地理分布的大致趋势是西北部山区较高,东南部平原区较低。This paper reports the environmental radiation level in Beijing. The monitoring sites were set up by net-grid method. In Beijing the grid point- weighted average values for y radiation dose and cosmic ray outdoors radiation dose are 56. 2 and 32. 3 nGy/h, respectively. The area- weighted average values of U-238, Th-232,Ra-226, K-40 and Cs-137 in soil are 19. 4、34. 1、21. 4. 662 and 8. 3 Bq/kg, respectively. The concentration range of U、Th and Ra-226, K-40 in various waters are 0. 12-8. 94、0. 02-0. 66μg/L and 6. 0-98. 1、19. 2-643 mBq/L, respectively. The geographical distribution of the environmental radiation levels is higher in the west-north mountain area and lower in the east-south plain of Beijing.

关 键 词：环境辐射水平 剂量率 北京 分布 

分 类 号：X837.01[环境科学与工程—环境工程]