| 摘要: |
| 本研究测定了2015年1～7月厦门市大气气溶胶中的7Be、210Pb 和210Po，利用多核素联合示踪研究了相关的大气过程.结果表明7Be和210Pb在1、3和4月份具有较高的活度水平和较大的活度变化范围，在6～7月份降低到相对较低的活度水平和一个相对较小的变化范围，不同的气团来源、对流混合及清除机制是其主要的控制因素.相对于7Be，7Be和210Pb同位素对对臭氧（O3）具有更好的相关关系.基于210Pb和210Po的数据计算出厦门市大气气溶胶停留时间为21～188 d，平均值为87 d.通过辐射剂量评估发现这3种放射性核素对人体所产生的年待积有效剂量仅为5.31 μSv， 近似为天然辐射本底的千分之一. |
| 关键词: 海洋化学 7Be 210Pb 210Po 气溶胶 停留时间 臭氧 剂量 |
| DOI：10.3969/J.ISSN.2095-4972.2016.02.016 |
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| 基金项目:福建省自然科学基金资助项目（2012J05077）；厦门市科技计划资助项目（3502Z20132007） |
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| Atmospheric processes studies and radiation dose assessment based on 7Be，210Pb and 210Po around Xiamen Island |
| MEN Wu,LIN Jing,WANG Fenfen,YIN Mingduan |
| (Laboratory of Marine Isotopic Technology and Environmental Risk Assessment，Third Institute of Oceanography， SOA， Xiamen 361005， China) |
| Abstract: |
| The activities of 7Be， 210Pb and 210Po in the aerosol of Xiamen city from January to July 2015 were measured. The tracer pair of 7Be and 210Pb was used to study the atmospheric transport processes.7Be and 210Pb had higher levels and changed significantly in January， February and April. However， this pair decreased to a low level and varied in a relatively small range from June to July. Different sources of air mass， some strong convective mixing and a removal process were the main control mechanisms. Furthermore， the tracer pairs of 7Be and 210Pb had a better correlationship with O3 than 7Be. Three different mechanisms control the concentrations of O3. Based on the data of 210Pb and 210Po， the average residence time of aerosol in Xiamen city was estimated to be 21~188 d with an average of 87 d. Radiation dose assessment revealed that the total committed effective dose derived from 7Be， 210Pb and 210Po is 5.31 μSv， which is three orders of magnitude lower than the natural background radiation. |
| Key words: marine chemistry 7Be 210Pb 210Po aerosol residence time O3 dose |
