Publisher © Czech Geological Survey, ISSN: 2336-5757 (online), 0514-8057 (print)

Differences of radon concentrations in deeper geological basement and in its Quaternary cover - a regional background for the intermediate radon index detailization (Czech Republic)


Ivan Barnet, Petra Pacherová, Lucie Kondrová

Geoscience Research Reports 43, 2010 (GRR for 2009), pages 192–194

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Differences in the mean soil gas and indoor radon concentrations and percentage fraction of high radon index test sites were calculated for 10 major rock types (Czech Republic) of a great areal extent. Each rock type was divided into 2 parts representing the areas of uncovered rock type and areas of Quaternary cover. The ArcGIS 9.3. processing used the vectorized geological map 1 : 500,000 for deeper basement and selection of Quaternary polygon files from the radon index maps at a scale 1 : 50,000, combined with the georeferenced soil gas radon database (Czech Geological Survey) and indoor measurements database of the National Radiation Protection Institute. The processing has discovered negligible differences in mean soil gas and indoor radon concentrations between covered and uncovered parts of basement rocks. The correlation coefficients of mean soil gas and indoor Rn reach very high value of R > 0.95 both for covered and uncovered parts of basement rock. These unexpected findings, caused mainly by relatively low thickness of Quaternary sediments and thus their low barrier effect on radon release from deeper basement, can contribute to more detailed dividing of intermediate radon risk category in Quaternary sediments according to the radon characteristics of their deeper basement