FIGURE 1-4 Distribution of radon concentrations in U.S. homes (modified from the National Residential Radon Survey; USEPA 1994).

rated from the context set by controversy and debate over the management of the risk posed by indoor radon. In the United States, the EPA has pursued a broad national strategy to reduce radon risks through voluntary testing of homes and mitigation of radon in those with an annual average above 148 Bqm-3 (4 pCiL-1). EPA finds a basis for risk management in its projections of 7,000-30,000 lung-cancer deaths per year attributable to residential radon exposure (Page 1993).

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