摘要
本文报道北京市土壤中天然放射性核素含量的调查方法和结果。基本与环境陆地γ辐射剂量率调查同位布点,全市共分析土壤样品157个,其中10 km×10 km 网格点土样122个,城镇加密点35个。测量^(226)Ra、^(232)Th、^(40)K 采用γ谱方法,^(238)U 采用放化分析方法。调查结果表明,北京市土壤中天然放射性核素含量按面积和点加权均值分别为:^(238)U,19.4和19.8 Bq·kg^(-1);^(226)Ra,21.4和22.6Bq·kg^(-1);^(232)Th,34.1和34.6 Bq·kg^(-1);^(40)K,662.3和649.9 Bq·kg^(-1)。
This paper reports the methods and results of investigation of natural radionu-clides in soil in Beijing.The collecting points of Soil are same as the measuring points of γ ra-diation dose rate of environmental ground.153 soil samples were collected and analysed byγ-spectrometry and radioehemical method,of which 122 points were sited in uniformly dis-tributed networks of 10 km×10 km.The results show that the area-weighted mean of ^(238)U,^(226)Ra,^(232)Th and ^(40)K was 19.4,21.4,34.1 and 662.3 Bq·kg^(-1), respectively.The point-weighted mean of ^(238)U,^(226)Ra,^(232)Th and ^(40)K was 19.8,22.6,34.6 and 649.9 Bq·kg^(-1),re-spectively.
出处
《辐射防护》
CAS
CSCD
北大核心
1993年第5期369-371,共3页
Radiation Protection
关键词
土壤
天然放射性
北京
环境调查
Soil
Natural Radionuclide
Content
Investigation
Beijing
