Indoor air pollution - the experience of radon.

Uses "Track Etch" detectors to measure nearly 40000 time-averaged radon concentrations in Canadian, Swedish and US homes. In some areas indoor exposure rates exceed 20 pci/l in as many as 15% of homes surveyed. Such levels may lead to an increased lung cancer risk. The "Track Etch" detectors are based upon a plastic nuclear track detector which undergoes permanent radiation damage when struck by an alpha particle. These small detectors are very convenient to use in occupied homes and buildings.