大气中^(7)Be和^(210)Pb时空分布特征差异和机制解析  

Spatiotemporal characteristics and mechanisms of^(7)Be and^(210)Pb in the atmosphere

作　　者：黄思宇 林武辉 何贤文 林晓东 HUANG Siyu;LIN Wuhui;HE Xianwen;LIN Xiaodong(School of Marine Sciences,Guangxi University,Nanning 530004,China;College of Harbour and Coastal Engineering,Jimei University,Xiamen 361021,China;South China Nuclear and Radiation Safety Supervision Station,Ministry of Ecology and Environment,Shenzhen 518026,China;Fujian Radiation Environment Supervision Station,Fuzhou 350013,China)

机构地区：[1]广西大学海洋学院,南宁530004 [2]集美大学港口与海岸工程学院,厦门361021 [3]生态环境部华南核与辐射安全监督站,深圳518026 [4]福建省辐射环境监督站,福州350013

出　　处：《核技术》2025年第3期60-74,共15页Nuclear Techniques

基　　金：国家自然科学基金(No.42276044);广西自然科学基金(No.2021GXNSFBA196001,No.2024GXNSFAA010449);福建省环保科技计划项目(No.2025R004);中国辐射防护研究院平台开放基金(No.ZFYHHJMN-2024003);广西南海珊瑚礁研究重点实验室开放基金(No.GXLSCRSCS2023003)资助。

摘　　要：对南宁市6 a内采集的75个气溶胶样品进行观测,其中^(7)Be和^(210)Pb活度浓度分别为0.27~11.95 mBq·m^(−3)、(3.68±0.51)mBq·m^(−3)和0.23~4.33 mBq·m^(−3)、(1.51±0.13)mBq·m^(−3),^(7)Be和^(210)Pb呈现“冬春高、夏秋低”季节特征,^(7)Be最高值出现在春季,^(210)Pb最高值则在冬季。^(7)Be、^(210)Pb与PM2.5、PM10的同相位季节特征和较强正相关说明颗粒物载带^(7)Be和^(210)Pb在大气中传输;^(7)Be与O3的强相关性证实“春季泄漏”引起^(7)Be自上而下从平流层进入对流层并导致^(7)Be春季最高值;大气逆轨迹聚类分析指示东亚季风导致^(210)Pb冬季最高值。整合全国17个不同地区大量数据发现,^(210)Pb存在纬度效应,即40°N以北^(210)Pb活度均值约为40°N以南的2.2倍;^(7)Be存在纬度效应和高度效应,即35°N以北^(7)Be浓度均值约为以南的1.9倍,^(7)Be自上而下从平流层输入对流层过程导致高海拔地区的高^(7)Be效应。^(7)Be和^(210)Pb时空分布差异导致二者冬春季有效剂量约为夏秋季的1.4倍,40°N以北地区有效剂量约为35°N以南的2.0倍。[Background]^(7)Be and^(210)Pb are the main radionuclides for monitoring the quality of the radiation environment of atmospheric aerosols,and the internal irradiation caused by their adsorption into aerosols and entry into the human body will be harmful to the human body,so it is of great significance to explore the characteristics and mechanisms of their spatial and temporal distribution and dose contribution.[Purpose]This study aims to investigate the differences in the spatial and temporal distributions of atmospheric^(7)Be and^(210)Pb and the mechanisms of these differences.[Methods]In this paper,75 aerosol samples were collected from Nanning city,from January 2015 to December 2017 and from January 2019 to May 2022 using an ultra-high-flow air aerosol sampler,and the activity concentrations of^(7)Be and^(210)Pb in the aerosol were measured and analyzed using a high-purity germanium(HPGe)γ-spectrometer.The activity concentration data of^(7)Be and^(210)Pb were systematically collected in 17 areas of our country,as well as PM2.5,PM10 and O3 air concentration data from January 2014 to November 2023 in Nanning city.Finally,the Lagrangian inverse trajectory analysis technique based on the Hybrid Single-Particle Lagrangian Integrated Trajectory(HYSPLIT)model,combined with the clustering analysis method based on MeteoInfo software,was employed to analyze the seasonal characteristic control mechanism of^(7)Be and^(210)Pb.[Results]The activity concentrations of^(7)Be in 41 aerosol samples from January 2019 to May 2022 ranges from 0.27 mBq·m^(−3)to 11.95 mBq·m^(−3),with a mean value of(3.68±0.51)mBq·m^(−3);the activity concentrations of^(210)Pb in 60 aerosol samples from January 2015 to December 2017 and from January 2019 to February 2021 ranges from 0.23 mBq·m^(−3)to 4.33 mBq·m^(−3),with a mean value of(1.51±0.13)mBq·m^(−3).Combining the^(7)Be and^(210)Pb activity concentration data in 17 areas of China,the seasonal distribution of^(7)Be and^(210)Pb activity concentrations in the atmosphere of Chin

关 键 词：气溶胶 ^(7)Be ^(210)Pb 放射性核素 辐射剂量 东亚季风 

分 类 号：X831[环境科学与工程—环境工程]