2015年春季北京室外空气^(212)Pb和~7Be浓度与空气污染关系研究

Study on the Relationship between ^(212)Pb and ~7Be Concentration and Air Pollution during Spring Beijing in 2015

目的监测2015年北京地区室外近地面空气气溶胶中γ放射性核素组成与空气污染的关系。方法采用便携式Staplex TF1A型大流量空气采样器采集室外近地面空气气溶胶,滤膜为Whatman公司生产的空气监测用滤膜,使用实验室HPGeγ能谱仪测量分析气溶胶滤膜样品。结果样品中检测出的放射性核素包括^(212)Pb和7Be,其中^(212)Pb的活度浓度大约在10^(-2)Bq/m^3的量级;~7Be的活度浓度大约在10-3Bq/m^3的量级;其他放射性核素均未检出。结论经与空气污染等指数进行分析发现,^(212)Pb的近地面空气中放射性核素活度浓度水平与PM2.5、PM10和空气污染指数的相关性有统计学意义,成正相关关系。~7Be的近地面空气中放射性核素活度浓度与空气污染指数的相关性有统计学意义,是弱负相关关系。

Objective To study the relationship between the composition of the types of radioactivity and air pollution in the near surface air aerosols in Beijing, 2015. Methods The portable Staplex TF1 A type high flow air samplers were used to collect outdoor air near the ground aerosol. Membrane Whatman was used as air monitoring membrane. Radioactivity of aerosol filter samples were analyzed using a laboratory HPGe gamma spectrometer. Results The radionuclides detected in samples in- cluding ：lzPb and 7Be, the radioactivity concentrations of ：tzPb were approximately in order of 10^-2 Bq/m^3 ; radioactivity concentrations of 7Be were approximately in the order of 10 ^-3 Bq/m^3 ; no other radionuclides were detected. Conclusion The correlation between ^212Pb and PM 2.5, PM 10 and air pollution index in the near surface of the air pollution index was statisti- cally significant, and the positive correlation was found. The correlation between the radopaetivity concentrations of radionuelides and the air pollution index in the near surface air of ^7Be is statistically significant, and it is a weak negative correlation.