Ions, electric fields and radon daughters : effects of filtration and electrostatic plateout

Over the last decade several procedures have been suggested for reducing the exposure of the public to radon and more specifically to its short-lived daughter products. Most of these procedures are aimed at lowering the radon level either by reducing the radon entry or by diluting the radon-rich indoor air with radon-free or radon-poor outdoor air. A direct removal, by mechanical or chemical methods, of radon from the air, is so far not practical, although theoretically possible. The radon daughters, on the other hand, being non-gaseous molecular clusters or particle-attached atoms, can be affected by such procedures as filtration and electrostatic plateout