摘要
本文报道西藏自治区土壤中天然放射性核素含量调查的方法与结果。基本与环境γ辐射剂量率调查同位布点,全自治区共采50×50 km 网格点土壤样品203个,考虑母岩母质、土壤类型和耕种情况而采集的加密点土样44个,共采集土壤样品247个。调查结果表明,西藏土壤中天然放射性核素含量按面积和网格点数加权平均值分别为:^(238)U,47.4和48.8 Bq·kg^(-1);^(232)Th,69.7和72.5 Bq·kg^(-1);^(226)Ra,43.0和44.9 Bq·kg^(-1);^(40)K,626.8和633.2 Bq·kg^(-1)。全自治区土壤中^(238)U、^(232)Th 和^(238)Ra 含量北部低、南部高,^(40)K 含量西北高、东南低。
This paper reports the methods and results of survey of natural radionuclides in soft in Tibetautonomous region.The collecting points of soil are same as the measuring points of γ radiation doserate of environmental groud.247 soil samples were collected,of which 203 points were sited in uni-formly distributed networds of size 50×50 km^2,44 points were more densely distributed according tothe geology,types of soil and conditions of cultivation.The results show that the area-weighted meanand point-weighted mean of ^(238)U,was 47.7 and 48.8 Bq·kg^(-1),^(232)Th,69.7 and 72.5 Bq·kg^(-1),^(226)Ra,43.0 and 44.9 Bq·kg^(-1),^(40)K,626.8 and 633.2 Bq·kg^(-1).The contents of^(232)U,^(232)Th,^(226)Ra insoil in north part of autonomous region are higher than that in south part of the region.The content of^(40)K in north-west part is higher than that in south-east part.
出处
《辐射防护》
CAS
CSCD
北大核心
1991年第5期375-381,共7页
Radiation Protection
关键词
土壤
放射性核素
含量
调查
西藏
Soil
Natural Radionuclide
Content
Survey
Tibet
