Pb aerosol size distributions

Lead-210 is produced from the a-decay of the event used to quantify Pb activity size distributions on the low-pressure (LPI) cascade impactors. While the relationship between the aerodynamic sizes of Pb and Pb is complicated because of the large differences in their atmospheric lifetimes, Pb has always been found associated with aerosol particles larger than Pb, as indicated by the differences in AMADs reported in Tables 2.3 and 2.4. 

Gmndel and Porstendorfer (2004) showed that the long-lived radon decay products Pb and Po are almost all (93-96%) adsorbed on aerosol particles in the accumulation size range and only 4-7% of their activities are attached on nuclei with diameters smaller than 60 nm. AMAD-values of 558 nm for Pb and 545 nm for Po were measured, i.e. significantly larger values than those of the short-lived radon and thoron decay products. 

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