Radon is a radioactive gas arising from the uranium decay chain, and high radon exposures have been shown to cause lung cancer. A large numbers of radon surveys have been carried out in spaces above the ground level in China and other countries. However, Radon is a radioactive gas arising from the uranium decay chain, and high radon exposures have been shown to cause lung cancer. A large numbers of radon surveys have been carried out in spaces above the ground level in China and other countries. However,