By National Council on Radiation Protection and Measurements
Read or Download Measurement of Radon and Radon Daughters in Air (Ncrp Report, No 97) PDF
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Example text
Radon concentrations in drinking water range up to many thousand Bq m-" Measurements of radon in water have tended to be concentrated in areas of high levels. ') and five percent greater than 370 kBq m-:' (10,000 pCi 1 I ) (Gesell and Prichard, 1977). On the other hand McGregor and Gourgon (1980) found a mean of 6,300 kBq m-Yl70,OOOpCi I-') in 11 drilled wells in Nova Scotia. I t has been shown that radon released from faucets and showers during domestic water use adds a significant amount to the total indoor radon exposure (Gesell and Prichard, 1977).
Complete sets of meteorological data are availat~lein this study including temperatures and dewpoints a t one meter above ground, wind speed and direction, barometric pressure, and precipitation. "No significant correlation was evident for any of these parameters" according to the author. '). Once in the atmosphere, turbulent diffusion originating from thermally driven convective processes or winds is effective in dispersing the radon. Diurnal and seasonal courses of atmospheric radon have been shown to be consistent with a diffusive transport model of this type.
All of these characteristics are important to the radon transport problem. In diffusive transport, a constituent of the soil gas flows in a direction opposite to that of the increasing concentration gradient (Fick's Law). Theory and experiment confirm that the concentration increases with depth reaching within three percent of the concentration at infinite depth at five meters when typical parameters for dry soils are used. Variation with depth was shown by Schery et d (1984) and Lindmark and Rosen (1985).
