期刊论文

Characteristics of distribution and environmental significance of ~(226)Ra and ~(210)Pb in sediments in Nansha sea area

Peng, A.

中文

环境化学

0254-6108

2021

40

08

2535-2543

10.7524/j.issn.0254-6108.2020040401

* 核燃料循环技术与装备湖南省协同创新中心开放基金（2019KFZ09），湖南省教育厅项目（19A433，12c0335）和湖南省大学 生创新项目（S201910555097）资助. Supported by Open Fund of Hunan Collaborative Innovation Center for Nuclear Fuel Cycle Technology and Equipment (2019KFZ09), Hunan Department of Education Project (19A433, 12c0335) and Innovation Project for College students in Hunan Province(S201910555097). * * 通讯联系人 Corresponding author，Tel：15211363618，E-mail：12100858@qq.com

本校为第一机构

用HPGeγ谱方法测定了6个来自南沙海域沉积物岩心的226Ra与210Pb,研究结果表明,226Ra的活度变化范围为（8.81±0.96）—（38.51±0.73）Bq·kg-1;210Pb的活度变化范围为（17.2±1.87） Bq·kg-1至（143.28±3.31）Bq·kg-1.226Ra和210Pb核素含量随岩心深度的增加总体上呈现不断减小的趋势,但在其中两个站位,226Ra的含量变化随着岩心深度增加先微弱增加,然后再逐渐减小.比较这6个岩心中226Ra与210Pb的活度发现,226Ra活度的变化范围相对较小,210Pb活度的变化范围相对较大,且226Ra与210Pb没有达到放射性平衡,有着明显的过剩210Pb(210Pbex).由岩心中210Pbex的垂直分布计算了这6个岩心中的沉积速率,其...

The results of the determination of ~(226)Ra and ~(210)Pb in six sediment cores from Nansha sea area by high-purity germanium (HPGe) γ spectrometry were as follows: the radioactivity of ~(226)Ra ranged from(8.81±0.96)—(38.51±0.73) Bq·kg~(–1); ~(210)Pb from(17.2±1.87)—(143.28±3.31)Bq·kg~(–1). The activities of ~(226)Ra and ~(210)Pb generally decreased with the depth. However, ~(226)Ra activity was observed to increase with the depth in the upper sediment layer at two stations(BKAS12 and BKAS64). Comparing the activities of ~(226)Ra an...