Determination of 210Pb concentration in the air at ground-level by gamma-ray spectrometry

210Pb activity concentrations in the air of Palermo were determined by γ-ray spectrometric analysis of 323 particulate samples collected in the period September 1995–December 1996. For each sample, the air filtered through a cellulose filter paper was 8600 m3 on average. The values of the daily activity concentration of 210Pb were ranging from 136 to 3390 μBq/m3.