Abstract
In Austria a comprehensive study on radiation exposure in waterworks was conducted. The aim of this study was to evaluate the risks for the affected employees. On the basis of geographical, geological and hydrological aspects, 21 waterworks were selected. A total of 85 passive short-term measurements and measurements with active devices for the detection of 222Rn were conducted and compared regarding their applicability to waterworks. Additionally, the results of 47 passive combined 222Rn/220Rn measurements for the detection of 220Rn are part of this paper. 222Rn was determined in row water samples. The influences of water flow rates and of the 222Rn activity concentration in water on the 222Rn activity concentration in indoor air of water supplies were investigated. On the basis of the results of radon measurements at 165 points, the annual effective doses for 74 persons of the staff were determined.
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