In 2014, an intercomparison exercise of passive radon detectors under field conditions in the Marie
Curie’s tunnel belonging to the Lurisia spas complex (Lurisia, Piedmont, Italy) has been held. Radon activity
concentration in the tunnel was measured with six radon active monitors, previously calibrated at ENEA-INMRI
facilities. In the present paper, a synthesis of the metrological aspects of the intercomparison is given. Indeed
particular attention was paid to metrological characterization of radon monitors and their response upon ambient
conditions. Correction factors have been defined to be applied when measurements are performed in severe
environmental conditions. In particular, it has been found that monitors are particularly sensitive to the effect of
air density: the AlphaGUARD (AG-SAPHYMO, GmbH) effi ciency decreases with the air density, while for the
MR1 PLUS (Tesys, Italy), the opposite applies. When the reference monitors were placed into the Marie Curie’s
tunnel, to the recorded average radon concentrations correction factors were applied. After the correction the
difference between data coming from AG and MR1 PLUS is within the 1.7%.
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