True or False: RDPs that plate out on a wall are considered a hazard.

Radon decay products (RDPs) that plate out on a wall are not typically considered a hazard in the same way that radon gas is. The concern with radon mainly lies with the inhalation of radon gas and RDPs which can be harmful when they are airborne and capable of entering the lungs. When RDPs attach to surfaces like walls, they are no longer in the air and thus present a lower immediate risk in terms of inhalation exposure.

In most environments, the plate-out of RDPs onto surfaces does not lead to significant health risks, especially when considering the average residential exposure levels. The risk associated with RDPs primarily comes from their presence in the air, so when they settle on surfaces, they reduce the potential for airborne exposure. Overall, the true hazard from radon is linked to concentrations in the air rather than the deposition on walls or other surfaces.