Some regularities in artificial radioactivity distribution in rain droplets

Investigations of the sup(210)Po distribution in rain droplets were carried and the methods of the determination of parameters characterizing the rain droplets were described. Conclusions from the material of 9 natural experiments being performed in 1972-1980 were drawn. The ranges of the modal, predominant and effective radii of raindrops were measured and their mean values were calculated. It was shown that by increase of modal, predominant and effective radii the number of raindrops with these radii in comparison with the all raindrops decreased. During a rain the droplets of optimal sizes (r=0.68-1.02 mm) existed; their number, mass and amount of the sup(210)Po washed out by them were maximal. A dependence of raindrops tracer radioactivity on the size and mass of raindrops was described