ABSTRACT A series of measurements of particulate samples collected on paper filters in Palermo (Italy) during 1995–2005 has been performed to detect Pb air activity concentration and, along with previous similar data on Be, to evaluate their activity ratio. Average values for the daily activity concentrations of Be and Pb are found to be 4.7 and 0.6 mBq m, respectively, 9.8 being the average activity ratio. Data confirm a seasonal behavior for both radionuclides. A correlation between Be and Pb air activity concentrations seems to exist, despite their different origins. The time behaviors of both Be and Pb air concentrations and Be/Pb activity ratio have been compared with some meteorological parameter time series. The analysis of the data shows a weak correlation with rainfall, while no correlation can be established with other parameters. Monthly and weekly average values have been reconstructed taking into account missing data, in order to carry out homogeneous comparisons with available data from other geographical areas. Data series correlations and the frequency analysis show the importance of atmospheric transport processes and the influence of meteorological and climatic parameters (in particular rainfall) in determining the concentrations in air of both radionuclides.

中文翻译：

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巴勒莫（意大利）地面空气中 7Be 和 210Pb 浓度和 7Be/210Pb 活度比分析

摘要 对 1995-2005 年在巴勒莫（意大利）的纸过滤器上收集的颗粒样品进行了一系列测量，以检测 Pb 空气活度浓度，并结合先前关于 Be 的类似数据，评估它们的活度比。发现 Be 和 Pb 的每日活动浓度平均值分别为 4.7 和 0.6 mBq m，9.8 是平均活动比。数据证实了两种放射性核素的季节性行为。尽管 Be 和 Pb 空气活性浓度的来源不同，但它们之间似乎存在相关性。已经将 Be 和 Pb 空气浓度和 Be/Pb 活度比的时间行为与一些气象参数时间序列进行了比较。数据分析显示与降雨量的相关性较弱，而与其他参数没有相关性。考虑到缺失数据重建了每月和每周平均值，以便与来自其他地理区域的可用数据进行同质比较。数据系列相关性和频率分析表明大气传输过程的重要性以及气象和气候参数（特别是降雨量）在确定空气中两种放射性核素浓度方面的重要性。