Abstract
Radon is the single major contributor to the ionizing radiation dose, about half of the total radiation exposure, received by the human population and is the second most frequent cause of lung cancer (3–14 % of all lung cancer is attributable to radon) after smoking. Radon was classified as a human carcinogen in 1988 by the International Commission on Radiation Protection, a cancer research agency under the World Health Organization. In this chapter, a historical development of studies related to indoor radon as health hazard is presented. A summary of burden of lung cancer from indoor radon and its progeny is given. Reference level (maximum accepted annual radon concentration in residential dwelling) and Action level (a level above which remedial action is required) for a number of countries are discussed. Factors that affect the indoor radon concentrations along with a mass balance approach for indoor radon in conjunction with the importance of ventilation rate on indoor air radon level is summarized. Key aspects on radon prevention methods and mitigation techniques, including design criteria for radon systems to minimize indoor air radon levels are discussed.
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