广州地区大气环境气溶胶样品放射性特征  

Radioactivity characteristics of atmospheric aerosol samples in Guangzhou

作　　者：覃连敬[1] 李美丽[1] 蒋岚[1] 宋海青[1] 

机构地区：[1]广东省环境辐射监测中心,广州510305

出　　处：《核技术》2016年第9期63-69,共7页Nuclear Techniques

摘　　要：对广州地区大气环境气溶胶样品的总α、总β、^(210)Pb、^(210)Po和7Be进行了为期两年采样监测,分别得到各监测项目年平均放射性活度浓度分别为0.12 m Bq·m^(-3)、0.75 m Bq·m^(-3)、0.93 m Bq·m^(-3)、0.23 m Bq·m^(-3)、3.16 m Bq·m^(-3)。总α、总β、^(210)Pb、^(210)Po和7Be活度浓度变化有明显的季节性特征:总α、总β、^(210)Pb、^(210)Po、7Be活度浓度最低值均出现在9月,总α、总β活度浓度最高值出现在11月,^(210)Pb、^(210)Po活度浓度峰值出现在2月,7Be活度浓度峰值出现在1月,总体呈现出冬春高、夏秋低的特点;^(210)Pb、^(210)Po、7Be与PM10、PM2.5有较强正相关性,但^(210)Pb、^(210)Po倾向于与比表面积更大的PM2.5结合,而~7Be更易附着在较大粒径的PM10上。Background： As an important content of radiation environmental monitoring in China, the atmospheric aerosol radioactive level has attracted much attention. Purpose： This study aims to find out variation regularity and affecting factors of radionuclide concentrations in atmospheric aerosol. Methods： The radioactivity concentrations of total α, total β, 210pb, 210po and 7Be in the atmosphere of Guangzhou urban were determined from January 2014 to December 2015. Results： The annual average concentrations of total α, total β, 210pb, 210Po and 7Be were 0.12mBq-m-3, 0.75 mBq.m-3, 0.93 mBq.m 3, 0.23 mBq.m-3, 3.16 mBq-m3, respectively. All of the minimum monitoring data occurred in September, however, the lowest activity period for each item was not the same, and the total α, total βappeared in November, 210pb, 210po appeared in February, and 7Be was in January. Conclusion： The radioactivity concentrations reflected obvious seasonal trends. 210Pb, 210Po and 7Be had the strong correlation with PM10 and PM2.5.210Pb, 210po intended to be absorbed on PM2.5 rather than PM10, while 7Be showed an opposite result.

关 键 词：气溶胶 放射性活度 相关性 PMIO PM2.5 

分 类 号：O615.13[理学—无机化学]