地理科学 ›› 2018, Vol. 38 ›› Issue (11): 1892-1903.doi: 10.13249/j.cnki.sgs.2018.11.017

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中国边缘海沉积物中239+240Pu的来源与存量模型

黄亚楠1,2(), 潘少明1(), 刘志勇3   

  1. 1.南京大学海岸与海岛开发教育部重点实验室,江苏 南京 210023
    2.澳大利亚国立大学物理与工程学院,ACT 堪培拉 2601
    3.苏州大学放射医学与防护学院,江苏 苏州 215123
  • 收稿日期:2018-01-15 修回日期:2018-07-25 出版日期:2018-11-20 发布日期:2018-11-20
  • 作者简介:

    作者简介:黄亚楠(1986-),男,河南正阳人,博士研究生,主要研究同位素地球化学与年代学。E-mail:highttee@163.com

  • 基金资助:
    国家重点研发计划项目(2016YFA0600502)和国家自然科学基金项目(41671466,41773004)资助

The Source and Inventory Model of 239+240Pu in the Sediment Cores of the Marginal Sea of China

Yanan Huang1,2(), Shaoming Pan1(), Zhiyong Liu3   

  1. 1.The Key Laboratory of Ministry Education of Coastal and Island Development, Nanjing University, Nanjing 210023, Jiangsu, China
    2. Department of Nuclear Physics, The Australian National University, ACT 2601, Australia
    3. School for Radiological and Interdisciplinary Sciences, Soochow University, Suzhou 215123, Jiangsu, China
  • Received:2018-01-15 Revised:2018-07-25 Online:2018-11-20 Published:2018-11-20
  • Supported by:
    National Key Research and Development Program (2016YFA0600502], National Natural Science Foundation of China(41671466,41773004)

摘要:

对海水和沉积物中239+240Pu活度、240Pu/239Pu比值和239+240Pu存量的分析,可以为海洋环境中水团输运、黑潮海水入侵、颗粒物通量、颗粒清除过程、污染物堆积、沉积年代等问题的研究提供有效途径。针对中国边缘海沉积物中239+240Pu活度分布、240Pu/239Pu比值特征和239+240Pu存量进行比较讨论,发现虽然全球大气沉降和太平洋核试验场的输入是中国边缘海沉积物中239+240Pu的2个主要来源,但是中国边缘海海洋环境中不同区域Pu的来源的比例有差异。同时,文中系统探讨了利用Pu端元法研究中国边缘海海洋沉积物中239+240Pu存量的质量平衡模型,这对认识海洋中沉积物的源与汇以及海洋放射性环境状况具有一定意义。

关键词: 239+240Pu, 240Pu/239Pu, 沉积通量, 存量模型, 中国边缘海

Abstract:

Plutonium (Pu) is valuable a tracer for the study of marine biogeochemical processes, and an important element for evaluating the state of the marine environment. In seawater and marine sediments, it provided an effective tool for the studies of water transport in the marine environment, seawater intrusion, particle inventories, particle removal processes, the accumulation of pollutants, sediment age and other issues. In this article, the distribution of 239+240Pu activities, 240Pu/239Pu atom ratios and 239+240Pu inventories in marine sediments from China's marginal seas were analyzed. It was found that different regions of the marine environment show differences in the origins of the Pu, with global fallout and PPG (Pacific Proving Grounds) inputs being the two major sources of Pu. The 240Pu/239Pu atom ratios in the surface sediments from China’s marginal seas ranged from 0.158 to 0.297, and the activity range was 0.048 to 1.160 Bq/kg.The ocean is a continuous whole, and there was no simple linear relationship between 239+240Pu and 240Pu/239Pu in marine surface sediments.Using a simplified Pu two-end members model to calculate the ratio of PPG contribution 239+240Pu in China's marginal sea sediments range was from 0 to 68%. The data of Pu were discussed to have significance for understanding the sources and sinks of Pu in the ocean and marine environment.

Key words: 239+240Pu, 240Pu/239Pu, inventory, estimation model, marginal sea of China

中图分类号: 

  • P597.+1