Abstract
222Rn concentrations in water supplies derived from wells have been determined in 70 houses in the area of Aberdeen. Supplies derived from igneous granite rock had 40–76 Bq litre −1, while those on metasedimentary rock had 3–35 Bq litre −1. Experiments performed while tap water was flowing demonstrated that the 222Rn concentration in air could be increased by several hundred Bq m −3. Factors related to 222Rn emanation rates were derived from fits of such data to theory. The contribution made by 222Rn from well water supplies to the annual effective dose equivalent was estimated to be 0.02–0.4 mSv. This was only 1–5% of the total dose from 222Rn in the atmosphere in the houses studied.
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