中国湖泊柱样沉积物中239+240Pu的来源与分布特征  

The Source and Distribution Characteristic of 239+240Pu in Sediment Cores of Chinese Lakes

作　　者：黄亚楠 潘少明[1] 刘志勇[2] Huang Yanan1, Pan Shaoming1, Liu Zhiyong2(1.The Key Laboratory of Ministry Education of Coastal and Island Development, Nanjing University, Nanjing 210023, Jiangsu, China; 2. School for Radiological and Interdisciplinary Sciences, Soochow University, Suzhou 215123, Jiangsu, Chin)

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]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3期437-447,共11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)资助~~

摘　　要：针对当前中国湖泊柱样沉积物中^（239＋240）Pu的研究现状,对中国湖泊^（239＋240）Pu的来源、^（239＋240）Pu最大蓄积峰的年代以及^（239＋240）Pu在湖泊沉积物中的迁移行为进行了研究总结。结果表明：中国湖泊^（239＋240）Pu的主要来源于全球大气核试验沉降,湖泊沉积柱样中表层沉积物^（240）Pu/^（239）Pu均值为0.177±0.019;柱样^（240）Pu/^（239）Pu均值为0.177±0.008;柱样^（239＋240）Pu的沉积通量范围在7.45~240.6 MBq/km^2之间,因湖泊所处沉积环境及纬度的差异而变化。湖泊柱样剖面中的^（239＋240）Pu的分布多呈单峰分布,湖泊沉积物中^（239＋240）Pu的最大蓄积峰位置改变可以忽略不计,^（239＋240）Pu最大蓄积峰具有时标价值。Abstract： China is a nation with numerous lakes; tracer studies of 239＋240pu have been carried out in 14 lakes. Ac- cording to the research status of 239＋240pu in Chinese lakes, this article summarizes the source, the migration be- havior of 239＋240Pu and the age of the maximum accumulation peaks of 239＋240pu. The results show that 239-240Pu in lacustrine sediment cores of Chinese lakes are mainly derived from the global atmospheric nuclear tests, the mean value of 240pu/239pu was 0.177±0.019 in the surface sediments, the mean value 240pu/239pu was 0.177± 0.008 in the all sediment cores. Because of the difference of lake sedimentary environment and latitude chang- es, the range of the 239＋240pu inventories of was 7.45-240.6 MBq/km2. The distribution characteristic of 239＋240pu in lacustrine sediment cores of Chinese lakes are mostly unimodal, and the migration of 239＋240pu in sediment cores can be neglected and the maximum accumulation peak of 239＋240pu has time scale value.

关 键 词：湖泊 柱样沉积物 ^239+240Pu ^240Pu/^239Pu 沉积通量 

分 类 号：P597.1[天文地球—地球化学]