首页 | 本学科首页   官方微博 | 高级检索  
     检索      

南海现代珊瑚骨骼中放射性核素特征指纹
引用本文:林武辉,余克服,邓芳芳,王英辉,冯禹,刘昕明,莫珍妮,马豪.南海现代珊瑚骨骼中放射性核素特征指纹[J].中国环境科学,2019,39(10):4279-4289.
作者姓名:林武辉  余克服  邓芳芳  王英辉  冯禹  刘昕明  莫珍妮  马豪
作者单位:1. 广西南海珊瑚礁研究重点实验室, 广西 南宁 530004; 2. 广西大学海洋学院, 广西 南宁 530004; 3. 自然资源部第三海洋研究所, 福建 厦门 361005; 4. 广西海洋研究院, 广西 南宁 530022; 5. 清华大学工程物理系, 北京 100084
基金项目:国家自然科学基金资助项目(91428203);广西"珊瑚礁资源与环境"八桂学者项目(2014BGXZGX03);广西自然科学基金(2017GXNSFBA198096);国家海洋局海洋-大气化学与全球变化重点实验室开放基金(GCMAC1606)
摘    要:利用地表实验室高纯锗γ谱仪、中国锦屏极深地下实验室高纯锗γ谱仪、低本底β计数器系统测定我国南海1500km空间跨度上10个不同站位、5种不同种类和形状的现代珊瑚骨骼中6种最主要的天然放射性核素(238U、226Ra、228Ra、40K)和人工放射性核素(137Cs和90Sr)的含量,获得现代珊瑚骨骼中放射性核素平均活度排序为238U(29.94Bq/kg) > 40K(11.72Bq/kg) > 228Ra(6.37Bq/kg) > 226Ra(3.16Bq/kg) > 90Sr(1.21Bq/kg) > 137Cs(<0.06Bq/kg).除了岸礁的珊瑚骨骼中228Ra活度高于环礁的珊瑚骨骼中228Ra活度的现象外,不同种类、不同离岸距离的珊瑚骨骼之间的同种放射性核素活度没有显著差异.本研究进一步对比珊瑚骨骼、珊瑚礁区沉积物、非珊瑚礁区的海洋沉积物、全球土壤的放射性核素活度含量,阐明珊瑚礁区是地表罕见的极低放射性水平区域,并指出现代珊瑚骨骼具有极低的226Ra/238U活度比值(~0.1)和极高的90Sr/137Cs活度比值(1000)的指纹特征.

关 键 词:珊瑚礁  放射性核素  漂浮型核电站  地下实验室  地球化学  
收稿时间:2019-03-06

Fingerprints of radionuclides in modern coral skeletons in the South China Sea
LIN Wu-hui,YU Ke-fu,DENG Fang-fang,WANG Ying-hui,FENG Yu,LIU Xin-ming,MO Zhen-ni,MA Hao.Fingerprints of radionuclides in modern coral skeletons in the South China Sea[J].China Environmental Science,2019,39(10):4279-4289.
Authors:LIN Wu-hui  YU Ke-fu  DENG Fang-fang  WANG Ying-hui  FENG Yu  LIU Xin-ming  MO Zhen-ni  MA Hao
Institution:1. Guangxi Laboratory on the Study of Coral Reefs in the South China Sea, Nanning 530004, China; 2. School of Marine Sciences, Guangxi University, Nanning 530004, China; 3. Third Institute of Oceanography, Ministry of Natural Resources, Xiamen 361005, China; 4. Guangxi Academy of Oceanography, Nanning 530022, China; 5. Department of Engineering Physics, Tsinghua University, Beijing 100084, China
Abstract:Naturally occurring radionuclides (238U, 226Ra, 228Ra, and 40K) and artificial radionuclides (137Cs and 90Sr) were measured using low background β counter system and High Purity Germanium (HPGe) γ spectrometry in 5 genera of coral skeletons collected from 10 locations in the SCS with a spatial coverage of 1500km. Mean activities in modern coral skeletons decreased from 238U (29.94Bq/kg), 40K (11.72Bq/kg), 228Ra (6.37Bq/kg), 226Ra (3.16Bq/kg), 90Sr (1.21Bq/kg) to 137Cs (<0.06Bq/kg). There were no significant trends of activity in relation to coral genera or distance to the land, with an exception of higher228Ra activity in the fringing reefs than in the atoll reefs. Cross-system comparisons of radioactivity in coral skeletons, sediments nearby or outside coral reefs, and global soil revealed coral reefs as extremely low radiation area on the Earth's surface. It was also found that modern coral skeletons were characterized by two common fingerprints of radionuclides (226Ra/238U and 90Sr/137Cs), including extremely low activity ratio of 226Ra/238U (~0.1) and extremely high activity ratio of 90Sr/137Cs (1000).
Keywords:coral reefs  radionuclide  floating nuclear power plant  underground laboratory  geochemistry  
本文献已被 CNKI 等数据库收录!
点击此处可从《中国环境科学》浏览原始摘要信息
点击此处可从《中国环境科学》下载免费的PDF全文
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号