title: Time variation of radon daughters concentration in snowfall.
abstract: Time variation of radon daughters concentration in snowfall was measured continuously. The relations of radon daughters concentration in snowfall to the precipitation and to atmospheric radon daughters concentration were investigated. It has become clear that when precipitation is small, radon daughters concentration in snowfall is distributed in a wide range, and that the quantity of radon daughters brought to ground surface by snowfall is proportional to precipitation. Washout effect of the snowfall on atmospheric radon daughters was also investigated.
mesh_terms: D001272:Atmosphere; D001729:Bismuth / Q000032:analysis*; D005720:Gamma Rays; D007854:Lead / Q000032:analysis*; D011059:Polonium / Q000032:analysis*; D011834:Radiation Monitoring; D017687:Radon Daughters; D011891:Rain; D012914:Snow; D013997:Time Factors; D014887:Weather
chemical_list: D017687:Radon Daughters; D007854:Lead; D011059:Polonium; D001729:Bismuth