Two databases of indoor radon measurements in the Walloon region in Belgium can be used to establish a radon risk map of this region, taking into account the geological information. The data were collected, respectively, by long-term track-etch measurements and by short-term charcoal measurements. Here we present a preliminary study showing that the two databases can be merged. We begin our study by testing two types of distributions: the log-normal distribution and the log-Gumbel distribution, with the purpose of selecting the best to fit our databases. The paper then describes a methodology that allows us to combine them. The composite database will be used to establish a radon risk map for the Walloon region based on geology.

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