中国边缘海沉积物中239+240Pu的来源与存量模型  

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

作　　者：黄亚楠 潘少明[1] 刘志勇[3] Huang Yanan;Pan Shaoming;Liu Zhiyong(The Key Laboratory of Ministry Education of Coastal and Island Development,Nanfing University,Nanjing 210023,Jiangsu,China;Department of Nuclear Physics,The Australian National University,ACT 2601,Australia;School for Radiological and Interdisciplinary Sciences,Soochow University,Suzhou 215123,Jiangsu,China)

机构地区：[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

出　　处：《地理科学》2018年第11期1892-1903,共12页Scientia Geographica Sinica

基　　金：国家重点研发计划项目(2016YFA0600502);国家自然科学基金项目(41671466,41773004)资助~~

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。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 of239 + 240 Pu activities,240 Pu/239 Pu atom ratios and239 + 240 Pu 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. The240 Pu/239 Pu atom ratios in the surface sediments from China’s marginal seas ranged from0.158 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 between239+240 Pu and240 Pu/239 Pu in marine surface sediments.Using a simplified Pu two-end members model to calculate the ratio of PPG contribution239 + 240 Pu 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.

关 键 词：239+240Pu 240Pu/239Pu 沉积通量 存量模型 中国边缘海 

分 类 号：P597.1[天文地球—地球化学]