基于~7Be、^(210)Pb和^(210)Po的厦门岛沿岸地区大气过程示踪研究及辐射剂量评估  

Atmospheric processes studies and radiation dose assessment based on ~7Be,^(210)Pb and ^(210)Po around Xiamen Island

作　　者：门武[1] 林静[1] 王芬芬[1] 尹明端[1] 

机构地区：[1]国家海洋局第三海洋研究所海洋放射性技术与环境安全评估实验室,福建厦门361005

出　　处：《应用海洋学学报》2016年第2期266-274,共9页Journal of Applied Oceanography

基　　金：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)

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5.31μSv,近似为天然辐射本底的千分之一.The activities of^7 Be,^210Pb and^210 Po in the aerosol of Xiamen city from January to July 2015 were meas-ured. The tracer pair of^7 Be and^210Pb was used to study the atmospheric transport processes.^7Be and^210 Pb 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^7 Be and^210Pb had a better correlationship with O3than^7 Be. Three different mechanisms control the concentrations of O3. Based on the data of^210 Pb and210Po,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^7 Be,^210Pb and^210 Po is 5. 31 μSv,which is three orders of magnitude lower than the natural background radiation.

关 键 词：海洋化学 ^7Be ^210PB ^210PO 气溶胶 停留时间 臭氧 剂量 

分 类 号：P734[天文地球—海洋化学]