Radon in the life environment and its countermeasures of prevention and control

Radon and its daughters are a primary component for human body received total natural radiation. They will hurt human body, even fall ill when human body is over-received radiation permitted in the life environment, especially indoors. The paper introduces mainly production mechanism of the radon and its daughters at indoor environment, the live environment investigation and monitoring technology, and effect factors on the radon concentration and distribution, as well as protection and control countermeasures for radon. (authors)