Publisher © Czech Geological Survey, ISSN: 2336-5757 (online), 0514-8057 (print)
The importance of maximum soil gas radon values for the radon risk evaluation in the Czech Republic
AbstractRegression relationships of mean, 3rd quartile and maximum soil gas radon concentrations were calculated for 23 aggregated rock types in the Czech Republic and particular radon test sites. The extreme ratios of maximum/mean soil gas radon concentrations were surprisingly discovered also in low radon risk Cretaceous sediments and loess cover, spatially bound to vicinity of contact with crystalline and magmatic basement and areas with enhanced Zr content in geochemical samples. The occurrence of maximum values even in low radon risk rocks supports the necessity of in situ radon measurements for building site assessment in all rock types and disproves some opinions to concentrate the measurements only into prognosed medium and high radon risk rock types.