Measurements in dwellings in different EU member states showed a large variation of the radon concentrations. In some EU member states governments already use action levels in order to control high radon levels. The main sources of radon have been identified to be the soil and the building materials. A reliable and cost-effective radon exhalation rate measuring method is thus of great importance especially for the building materials industry. Different measurement methods of radon exhalation from soils and building materials have been recently developed in several EU member states. These methods are (ⅰ) based on different measuring principles and, (ⅱ) partially still under development. As a consequence, both the accuracy of the results and their comparability are limited. In order to increase the necessary reliability as well as the comparability, the main methods and their backgrounds were inventoried and discussed.
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