Radon Exposure and its Health Effects

About half the natural radiation dose to humans is due to radon and its decay products. It is well known that exposure to high levels of radon causes lung cancer, but as yet, there is still little data on the effect of long-term exposure to low levels of environmental radon. The studies by our radon research group at the NIRS are directed toward determining the health effects of low level exposure to environmental radon. In this paper, our current studies on radon are reviewed.