Wang Huan, Meng Qinghua, Ma Yongzhong, Lou Yun, Bai Bin, Zhu Weijie, Kong Yuxia, Wang Hongfang, Feng Zechen, Zhai Shuguang, Yu Jun
Beijing Center for Disease Prevention and Control, 16 Hepingli Middle Street, Beijing, 100013, China.
Beijing Center for Disease Prevention and Control, 16 Hepingli Middle Street, Beijing, 100013, China.
J Environ Radioact. 2023 Jun;262:107162. doi: 10.1016/j.jenvrad.2023.107162. Epub 2023 Mar 17.
In order to establish a regional database on natural radioactivity, a series of measurements of 713 atmospheric aerosol samples collected on filters over a two-year period (2018-2019) in center of Beijing, northeastern China have been performed to analyze Be and Pb activity concentrations. The mean activity concentrations of Be and Pb were found to be 7.10 ± 2.44 mBq m and 2.93 ± 1.52 mBq m, respectively. Both the radionuclides exhibited strong seasonal variations, with maximum concentration of Be occurring in the spring and that of Pb in the winter. The concentration of both the radionuclides was minimum in the rainy summer. Higher Be concentration in the spring was mainly caused by the stratosphere to troposphere exchange. Higher Pb concentration during winter was maybe attributed to the combustion processes in heating systems and the ingression of continental air masses resulted from winds originating from northwest. The dependence of the activity concentrations of Be and Pb with meteorological parameters such as rainfall, temperature, and humidity was studied through linear correlation analysis. Statistically significant negative correlations were observed between Be and Pb activity concentrations with rainfall, respectively, which suggested that the removal mechanisms of these two radionuclides were similar. Lead-210 showed statistically significant correlations with temperature, humidity and PM. A comparison of the data obtained in the present study for Beijing with the northern hemisphere literature values of Be and Pb in the atmospheric aerosols showed that the values were smaller than the ones observed in the present study. Overall, the study provides an improved understanding of the temporal variability and correlation of Be and Pb concentrations in the atmosphere in center of Beijing, northeastern China.
为建立一个关于天然放射性的区域数据库，对2018 - 2019年两年期间在中国东北北京市中心通过滤膜采集的713个大气气溶胶样本进行了一系列测量，以分析铍（Be）和铅（Pb）的活度浓度。结果发现，铍和铅的平均活度浓度分别为7.10 ± 2.44 mBq/m³和2.93 ± 1.52 mBq/m³。这两种放射性核素均表现出强烈的季节变化，铍的浓度最大值出现在春季，而铅的浓度最大值出现在冬季。这两种放射性核素的浓度在多雨的夏季最低。春季较高的铍浓度主要是由平流层向对流层的交换引起的。冬季较高的铅浓度可能归因于供暖系统中的燃烧过程以及源自西北风的大陆气团的侵入。通过线性相关分析研究了铍和铅的活度浓度与降雨、温度和湿度等气象参数的相关性。分别观察到铍和铅的活度浓度与降雨之间存在统计学上显著的负相关，这表明这两种放射性核素的去除机制相似。铅 - 210与温度、湿度和颗粒物（PM）表现出统计学上显著的相关性。将本研究在北京获得的数据与北半球大气气溶胶中铍和铅的文献值进行比较，结果表明文献值小于本研究中观测到的值。总体而言，该研究有助于更好地理解中国东北北京市中心大气中铍和铅浓度的时间变化及相关性。
