Assessing Radon-in-air from streamflow, comparing two study cases: Labso-Laura and Capodifiume springs (Campania region, southern Italy)

This paper deals with a particular kind of radon-in-air Springs: the degassing from spring and related channels in a rural and urban landscape. The two study areas are located, the first, at the Cilento Geopark Geosite of Capodifiume spring group and, the second, in the Montoro alluvial plain (southern Italy). Based on previous hydro-geological studies, field measurements campaigns have been carried out during the 2013 spring-autumn time on monitoring stations located along springs and downstream irrigation channels. Laboratory analysis and environmental calculations have yet provided insight on space-time radon distribution in spring and stream flow, confirming radon as effective tracer in hydro-geomorphological analysis. Beside this, field experiments on radon-in-air concentration and diffusion by radon degassing from the surface flowing water have been performed in order to define influenced areas by radon diffusion. Results give effective insights in radon risk assessment for urban planning and radon mitigation actions.