“…The lowest radon progeny concentrations are recorded during the springesummer months when atmospheric turbulence is high and soil humidity is also high. The data presented in this paper are in good agreement with literature data (Moses et al, 1963;Duen˜as et al, 1994;Eisenbud and Gesell, 1997;Winkler and Aehlig, 1998;El-Hussein et al, 2001;Winkler et al, 2001;Sesana et al, 2003). The lowest thoron progeny concentrations were recorded in the winter months characterised by significant snow coverage of the soil for many days.…”