Abstract
Abstract The effect of an air cleaner on 220 Rn progeny atmospheres has been studied in a Radon/Thoron Test Facility (RTTF) of the walk-in type. The air cleaner consists basically of a fan and a special filter material sandwiched between two metal screens, to which an electric field is applied. The filter is of the polarized media type and uses fibreglass as material. The fan and filter system are housed in a metal case. Air is drawn from the back of the case by means of the fan and forced through the “electrical” filter where removal of the 220 Rn progeny occurs. Radon-220 progeny “depleted” air is discharged at the top of the device. Tests were conducted in 220 Rn/ 220 Rn progeny atmospheres when the air cleaner was operating, and when it was turned off. Very pronounced effects were observed during the operation of the device, namely: a dramatic decrease in the 220 Rn progeny concentrations and the total aerosol concentration, as well as a large increase in the 220 Rn progeny unattached fractions and the plate-out of these radionuclides on the walls of the RTTF. The air cleaner has potential in industrial applications, which should be explored.
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