What can gross alpha/beta activities tell about Po and Pb in the atmosphere?

Po and Pb represent the most abundant part of atmospheric aerosol long-lived natural radioactivity. Moreover, Pb-Po monitoring in the atmosphere can be of interest for tracking extreme natural events that can enhance the level of alpha/beta radioactivity in air. In this paper, we question the possibility to use routine gross alpha/beta measurements in order to monitor Po, Pb and Po/Pb ratio in the atmosphere.