Exposures from the Uranium Series With Emphasis on Radon and by National Council on Radiation Protection & Measurement

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The majority of the radon found in homes comes from the soil air, which moves to the atmosphere by diffusion. A complicating factor is that this radon in soil air often dissolves in ground water, which then transports the radon to sites distant from where it was formed. The radon will emanate from the ground water when the water reaches the surface near foundations or near sumps. , 1977; Caetren, 1980) and Halifax (McGregor and Gourgon, 1980). Emanation of radon from building materials follows the same diffusion pattern as that from soil.

The radon will emanate from the ground water when the water reaches the surface near foundations or near sumps. , 1977; Caetren, 1980) and Halifax (McGregor and Gourgon, 1980). Emanation of radon from building materials follows the same diffusion pattern as that from soil. Surface contamination with from commercial operations has been responsible for elevated indoor radon daughter concentrations in a few areas such as Port Hope in Canada. 4 Sources of Radon in Buildings It has been customary to describe radon levels indoors as average natural, elevated natural, and enhanced or man-made.

Geological Survey carried out a study in Sarasota County, FL (Sutcliffe and Miller, 1981). They reported on 200 samples from 92 wells. Radium-226 was measured in 161 of the samples and half of these showed concentrations >5 pCi/l with a maximum of 110 pCi/l. Very few samples showed less than 1 pCi/l. 3 Enhanced Exposures. Kaufmann and Bliss (1977) studied the effects of both phosphate mineralization and the phosphate industry on the ground water in Central Florida. They found a range of 1 to 15 pCi/l for the geometric means for various areas, but could see no evidence of contamination by the industry.

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