Gross alpha- and beta-activities in rainwater and airborne particulate samples. Influence of rainfall and radon

Measurements of α and β radioactivity were made each month during the years 1993 and 1994 for rainwater samples, and each week for airborne particulate samples collected using air filters at a clear site. The relationship between the measured activities of rainwater and the amount of rainfall was studied. An experimental study of the 220Rn and 222Rn decay products was made for the air-filtered samples and led to the conclusion that a waiting period of 5 days is necessary between the sampling time and the time of the activity measurement.