On the natural 210Po alpha-radioactivity in the precipitation droplets falling out from the Cumulonimbus clouds

Alpha-radioactivity of the rain droplets falling out from the Cumulonibus clouds has been investigated. Statistically true distribution of the natural 210Po alpha-radioactivity in rain droplets depending on their size has been determined using the data obtained during field experiments. For the first time not only the absolute values of the natural 210Po in rain droplets of the radii 0.24-2.05 mm have been measured but also the probability of the droplets with a definite 210Po radioactivity has been calculated