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.
作者
黄亚楠
潘少明
刘志勇
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)
出处
《地理科学》
CSSCI
CSCD
北大核心
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~~
