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We describe a detector of alpha particles based on wire type counters(single-wire and multiwire) operating in ambient air at high gas gains(100-1000). The main advantages of these detectors are: low cost, robustnessand ability to operate in humid air. The minimum detectable activity achievedwith the multiwire detector for an integration time of 1 min is 140 Bq per m3,which is comparable to that featured by commercial devices. Owing to suchfeatures the detector is suited for massive application, for example forcontinuous monitoring of Rn or Po contaminations or, as discussed in the paper,its use in a network of Rn counters in areas affected by earth-quakes in orderto verify, on a solid statistical basis, the envisaged correlation between thesudden Rn appearance and a forthcoming earthquake.

Performance of wire-type Rn detectors operated with gas gain in ambient air in view of its possible application to early earthquake predictions