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南沙海域沉积物岩心228Ra和228Th的深度变化

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刘劲, 吴雨田, 邓爽, 刘敏, 刘广山, 肖静水, 彭安国. 南沙海域沉积物岩心228Ra和228Th的深度变化[J]. 环境化学, 2020, (8): 2272-2278. doi: 10.7524/j.issn.0254-6108.2019112101
引用本文: 刘劲, 吴雨田, 邓爽, 刘敏, 刘广山, 肖静水, 彭安国. 南沙海域沉积物岩心228Ra和228Th的深度变化[J]. 环境化学, 2020, (8): 2272-2278. doi: 10.7524/j.issn.0254-6108.2019112101
shu
LIU Jing, WU Yutian, DENG Shuang, LIU Ming, LIU Guangshan, XIAO Jingshui, PENG Anguo. Depth profiles of 228Ra and 228Th in sediment cores in Nansha sea area[J]. Environmental Chemistry, 2020, (8): 2272-2278. doi: 10.7524/j.issn.0254-6108.2019112101
Citation: LIU Jing, WU Yutian, DENG Shuang, LIU Ming, LIU Guangshan, XIAO Jingshui, PENG Anguo. Depth profiles of 228Ra and 228Th in sediment cores in Nansha sea area[J]. Environmental Chemistry, 2020, (8): 2272-2278. doi: 10.7524/j.issn.0254-6108.2019112101
shu

南沙海域沉积物岩心228Ra和228Th的深度变化

  • 1. 南华大学核科学技术学院, 衡阳, 421001;

  • 2. 厦门大学海洋与生态学院, 厦门, 361005

    • 通讯作者: 彭安国, E-mail: 15211363618@163.com
  • 基金项目:

    核燃料循环技术与装备湖南省协同创新中心开放基金（2019KFZ09）和湖南省教育厅项目（19A433，12c0335）资助.

Depth profiles of 228Ra and 228Th in sediment cores in Nansha sea area

  • 1. School of Nuclear Science and Technology, University of South China, Hengyang, 421001, China;

  • 2. College of Ocean and Ecology, Xiamen University, Xiamen, 361005, China

    • Corresponding author: PENG Anguo, 15211363618@163.com
  • Fund Project: Supported by Open Fund of Hunan Collaborative Innovation Center for Nuclear Fuel Cycle Technology and Equipment (2019KFZ09) and Hunan Department of Education Project (19A433,12c0335).

  • 摘要: 用HPGe γ谱方法测定了6个来自南沙海域沉积物岩心的228Ra和228Th.测定结果如下：228Ra的放射性比活度变化范围为（15.73±1.00）Bq·kg-1至（44.35±1.69）Bq·kg-1，平均值的变化范围为（17.86±0.98）Bq·kg-1至（39.78±1.76）Bq·kg-1；228Th的放射性比活度变化范围为（13.62±0.67）Bq·kg-1至（49.21±1.05）Bq·kg-1，平均值的变化范围（17.30±0.55）Bq·kg-1至（42.89±0.99）Bq·kg-1.与其他海域比较发现，本研究海域的228Ra和228Th比活度及平均值比其他大部分海域稍低.比较6个岩心的结果发现，228Ra和228Th的变化范围基本相同，同时深度变化趋势也非常一致，表明在该研究海域，228Ra和228Th在不同深度处都基本上达到了放射性平衡，没有明显的过剩228Ra存在.这两个核素的深度变化趋势大致分为两种情况，一是随深度的增加有一个微弱的增加趋势，但在中间深度处有一个突然减小的变化；二是随深度的增加呈现出逐渐减小的趋势，但有两个岩心在最深层段出现较大的变化.
    Abstract: 228Ra and 228Th in six sediment cores in Nansha sea were measured by HPGe gamma spectrometry. The results showed that the activities of 228Ra in these cores ranged from (15.73±1.00) Bq·kg-1 to (44.35±1.69) Bq·kg-1 and the range of the average value was (17.86±0.98) Bq·kg-1 to (39.78±1.76) Bq·kg-1. As for 228Th, the activity ranged from (13.62±0.67) Bq·kg-1 to (49.21±1.05) Bq·kg-1 and the range of the average value was (17.30±0.55) Bq·kg-1 to (42.89±0.99) Bq·kg-1.Comparing with results in other sea areas, the content and average value of 228Ra and 228Th were slightly lower than those in most of other sea areas. After comparing the activities of the 228Ra and 228Th in the six cores, it was found that their changing ranges were basically the same, and the trends of depth profiles were very consistent, indicating that 228Ra and 228Th from the samples in the study area reached radioactive equilibrium, with no apparent excess 228Ra present. The depth profiles of the two nuclides could be roughly divided into two types, one was a slight increase with the increase of depth, but there was a sudden decrease in the middle depth; while the other was a gradual decrease with the increase of depth, but there were greater changes in the deepest segment in two cores.
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  • 收稿日期:  2019-11-21

南沙海域沉积物岩心228Ra和228Th的深度变化

    通讯作者: 彭安国, E-mail: 15211363618@163.com
  • 1. 南华大学核科学技术学院, 衡阳, 421001;
  • 2. 厦门大学海洋与生态学院, 厦门, 361005
  • 收稿日期:  2019-11-21
基金项目:

核燃料循环技术与装备湖南省协同创新中心开放基金（2019KFZ09）和湖南省教育厅项目（19A433，12c0335）资助.

摘要: 用HPGe γ谱方法测定了6个来自南沙海域沉积物岩心的228Ra和228Th.测定结果如下：228Ra的放射性比活度变化范围为（15.73±1.00）Bq·kg-1至（44.35±1.69）Bq·kg-1，平均值的变化范围为（17.86±0.98）Bq·kg-1至（39.78±1.76）Bq·kg-1；228Th的放射性比活度变化范围为（13.62±0.67）Bq·kg-1至（49.21±1.05）Bq·kg-1，平均值的变化范围（17.30±0.55）Bq·kg-1至（42.89±0.99）Bq·kg-1.与其他海域比较发现，本研究海域的228Ra和228Th比活度及平均值比其他大部分海域稍低.比较6个岩心的结果发现，228Ra和228Th的变化范围基本相同，同时深度变化趋势也非常一致，表明在该研究海域，228Ra和228Th在不同深度处都基本上达到了放射性平衡，没有明显的过剩228Ra存在.这两个核素的深度变化趋势大致分为两种情况，一是随深度的增加有一个微弱的增加趋势，但在中间深度处有一个突然减小的变化；二是随深度的增加呈现出逐渐减小的趋势，但有两个岩心在最深层段出现较大的变化.

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