就地HPGe谱仪测量分析长白山土壤中的^(137)Cs等γ核素  

In Situ Measurement and Analysis of ^(137)Cs and Otherγ-emitting Radionuclides in Soil of Changbai Mountain by HPGe Spectrometer

作　　者：吴永乐[1] 吴彩霞[1] 柳加成[1] 邱学军[1] 谭彬[1] 杨斌[1] 岳会国[1] 刘巧凤[1] WU Yongle;WU Caixia;LIU Jiacheng;QIU Xuejun;TAN Bin;YANG Bin;YUE Huiguo;LIU Qiaofeng(Nuclear and Radiation Safety Center,Ministry of Environmental Protection,Beijing 100082,China)

机构地区：[1]环境保护部核与辐射安全中心,北京100082

出　　处：《原子能科学技术》2018年第10期1861-1866,共6页Atomic Energy Science and Technology

基　　金：国家自然科学基金青年基金资助项目(11405071)

摘　　要：长白山是欧亚大陆东缘的最高山系,是首批国家级自然保护区,自然环境受人类扰动较少,能较好地反映全球大气核试验、前苏联切尔诺贝利核事故在长白山地区沉降的^(137)Cs量。为调查^(137)Cs经多年衰变和迁移后在长白山土壤中的分布规律,本文利用就地HPGeγ谱仪测量分析了长白山主峰北坡、南坡及西坡的高山荒漠带、苔原带、岳桦林带、针叶林带等土壤中^(238)U、^(232)Th、^(40)K和^(137)Cs的活度浓度。结果表明,火山灰覆盖的区域,土壤中的^(238)U和^(232)Th等天然放射性核素含量较高,最高值分别为112Bq/kg和154Bq/kg;植被茂盛、地势平坦区域^(137)Cs活度浓度较高,最高为1.07×104 Bq/m^2。Changbai Mountain,which is the highest mountain located on the eastern edge of Eurasia,was set up as the first National Nature Reserve.Due to little interferences of human activities,the soil of the Changbai Mountain could reflect the artifical nuclides of 137 Cs deposited on the ground from global atmospheric nuclear tests and Chernobyl nuclear accident.To investigate the distribution pattern of 137 Cs in Changbai Mountain soil after years of decay and migration,in situγ-ray spectrometer was applied to measure theγ-emitting radionuclides in soil of the desert regions,tundra regions,birch forest regions and conifer forest regions of northern slope,southern slope and western slope.The results show that the contents of 238 U and 232 Th maintain a relative high level in the region covered by volcanic ash.The maximum values reach 112 Bq/kg and 154 Bq/kg for 238 U and 232 Th,respectively.The activity concentration of 137 Cs maintains a relative high level in the flat and lush vegetative terrain.The maximum value of activity concentration is up to 1.07×10 4 Bq/m 2.

关 键 词：就地Γ谱仪 长白山 137Cs 活度浓度 

分 类 号：TL751[核科学技术—辐射防护及环境保护]