Improving the Austrian radon potential map

Category Other
Group GSI.IR
Location International Geological Congress,oslo 2008
Author Friedmann, Harry; Groeller, Joulieta
Holding Date 08 October 2008

From the Austrian National Radon Project (1992-2002) a Radon potential map as well as a mean indoor Radon concentration map is available. These maps are based on the average radon potential/concentration within every municipality and sort municipalities into three radon ’risk’ classes. This is a convenient way for the administration but it does not always describe the real radon risk distribution within a municipality because of the often inhomogeneous geological situation. Therefore, a combination of indoor radon data with all relevant parameters like house type, storey, ventilation rates etc. and geological information should be used to improve the existing radon maps. This is essential in areas with a rather low density of measurement points which is the case in most countries.
Here, a method is described which uses Bayes’ theory to combine the radon potential derived from indoor radon measurements with information from geology. The existing radon potential map was improved by using available soil gas radon data at certain geological units and extrapolated transfer factors. The modifications of the map will be shown and several problems arising with the application of this technique will be discussed.