广西壮族自治区土壤中天然放射性核素含量调查研究

SURVEY OF NATURAL RADIONUCLIDE CONTENTS IN SOIL IN GUANGXI ZHUANGZU AUTONOMOUS REGION

本文报道广西壮族自治区土壤中天然放射性核素含量调查的主要结果。基本与环境陆地γ辐射剂量率调查同位布点,全自治区共采集土壤样品383个,其中包括25 km×25 km 网格点样品360个,土壤类型加密点21个,特殊点2个。测量采用γ能谱法。调查结果表明,广西壮族自治区土壤(干样)中天然放射性核素^(238)U、^(226)Ra、^(232)Th、^(40)K 含量按面积加权平均值(±单次测量标准差)分别为:53.0(±32.7)、53.1(±35.2)、69.1(±34.6)和332.2(±234.4)Bq/kg。调查中发现“花山-姑婆山”一带土壤中天然放射性核素含量显著偏高,其土壤中^(238)U、^(226)Ra、^(232)Th、^(40)K 含量分别为170、184、211、766Bq/kg。

This paper reports the methods and results of investigation of natural radionu-clides in soil in Guangxi Zhuangzu Autonomous Region.The collecting points of soil aresame as the measuring points of γ radiation dose rate of environmental guound.383 soil sam-ples were collected and analysed by γ-spectrometry,of which 360 points were sited in uni-foumly distributed metworks of size 25 km×25 km.The results show that the area-weightedmean of ^(238)8U,^(226)Ra,^(232)Th and ^(40)K was 53.0(±32.7),53.1(±35.2),69.1(±34.6) and332.2(±234.4)Bq/kg.The content of ^(238)U,^(226)Ra,^(232)Th,^(40)K in soil in an abnormal back-guound area near“Huashang-Guposhang”was 170,184,211,766 Bq/kg.