Diurnal and semidiurnal cyclicity of Radon (222Rn) in groundwater, Giardino Spring, Central Apennines, Italy
Understanding natural variations of Rn (222Rn) concentrations is the fundamental
prerequisite of using this radioactive gas as a tracer, or even precursor, of natural processes, including
earthquakes. In this work, Rn concentrations in groundwater were continuously measured over
a seven-month period, during 2017, in the Giardino Spring, Italy, together with groundwater levels
in a nearby well installed into a fractured regional aquifer. Data were processed to reduce noise,