×新区土壤中放射性核素水平评估  

Evaluation of Radionuclide Level in Soil of Xiong'an New Area

作　　者：孔令海 袁洋 范真真 张立红 喻正伟 袁之伦 KONG Ling-hai;YUAN Yang;FAN Zhen-zhen;ZHANG Li-hong;YU Zheng-wei;YUAN Zhi-lun(Nuclear and Radiation Safety Center of Ministry of Ecology and Environment,Beijing 102445,China;College of Environmental Science and Engineering,Ocean University of China,Qingdao Shandong 266100,China;Environmental Engineering Assessment Center of Ministry of Ecology and Environment,Beijing 100012,China)

机构地区：[1]生态环境部核与辐射安全中心,北京102445 [2]中国海洋大学环境科学与工程学院,山东青岛266100 [3]生态环境部环境工程评估中心,北京100012

出　　处：《核电子学与探测技术》2022年第2期265-268,共4页Nuclear Electronics & Detection Technology

摘　　要：通过调查×新区土壤中放射性核素含量水平,对×新区未来的建设和辐射监管具有重要意义.按照5 km×5 km的网格布点,共完成×新区81个土壤样品和8个重要水域的底泥样品的采集,使用高纯锗γ谱仪测量了样品中γ放射性核素种类及活度浓度.结果显示,检测出^(238)U、^(232)Th、^(226)Ra和40K等天然放射性核素,部分点位检测出人工放射性核素^(137)Cs,对公众的最大外照射剂量贡献值为0.694 mSv/y.×新区土壤中放射性核素含量处于正常的本底水平,对公众的外照射小于标准限值要求.The investigation of radionuclide content in soil in xiong'an new area is of great significance to the future construction and radiation supervision of xiong'an new area.According to the grid layout of 5 km×5 km,a total of 81 soil samples and sediment samples from 8 important waters in xiong'an new area were collected.Then the types and activity concentrations of gamma radionuclides were measured by high purity germanium gamma spectrometer.The results showed that Uranium-238,Thorium-232,Radium-226 and Potassium-40 natural radionuclides were detected,and Cesium-137 artificial radionuclides were detected in some sites.The nuclide activity concentration range of uranium-238 is 12.3~38.9 Bq/kg;thorium-232 is 24.0~65.9 Bq/kg;radium-226 is 11.6~35.2 Bq/kg;potassium-40 is 308~634 Bq/kg;cesium-137 is LD~7.86 Bq/kg.The maximum external dose contribution to the public is 0.694 mSv per year.The content of radionuclides in the soil of xiong'an new area is in the normal background level,and the external exposure to the public is less than the standard limit.

关 键 词：土壤 放射性核素 活度浓度 Γ能谱 

分 类 号：TL751[核科学技术—辐射防护及环境保护]