Indoor radon measurements in Calabria (Southern Italy)

Radon gas from the ground is the main source of indoor concentrations in buildings, regardlessof construction characteristics. According to Council Directive 2013/59/EURATOM, EU MemberStates must establish national reference levels for indoor radon concentrations in workplacesand draw up a National Radon Plan. In Calabria (Southern Italy), maps of indoor measurementsat regional scale are not available. A set of 1434 average annual measurements, taken between2010 and 2021, has been analysed. For a limited sector, a geostatistical approach allowed tomap the expected concentrations at ground floor, the spatial uncertainty of estimates, andthe probability of exceedance of the 300 Bq m-3 Italian threshold for workplaces. Highestvalues characterize the eastern border of the Sila massif. Obtained maps might be used tooptimize locations of additional dosimeters, based on geological constraints. Such studiesmay support urban planning policies and provide recommendations on building techniques.