Influence of sampling air flow rate in the decay correction applied to the determination of Be-7 and short-lived radionuclides in aerosol samples

摘要

An original decay correction procedure is proposed for the activity determination of short-lived radionuclides in airborne dust samples. To this end, the hypothesis of air flow rate attenuation during sampling is considered and tested. The other decay corrections: to the delay time, from the end of the sampling until the start of the counting; and to the counting time, were executed as standard. Differences from classic corrections, which consider a constant air flux rate in the sampling with a weekly sampling duration, are of the order of 1% for Be-7 and approximately 10% for I-131.