Radiometric efficiency of analytical filters at different physical conditions

The radiometric efficiency of three analytical filters AFA-RSP-20, AFA-RMP-20 and AFA-RMV-20 was examined at different air velocities and aerosol number concentrations. An experimental setup had been constructed with 2 m 3 radon chamber. Alpha radiometry was used to measure the deposited activities in the filters. Aerosols parameters like number concentration and size distribution are measured continuously with an aerosol diffusion spectrometer (ADS). RMV filter has a stable efficiency ~ 99.8%. The RSP and RMP filters efficiency is depending on the aerosol concentration and air sampling velocity. The effect of an aerosol concentration on the filter efficiency is more obvious than the effect of air velocity.