Solid-state nuclear track detectors are widely used for integrated measure ments of radon and its daughter products in the environment. However, these detectors have to be calibrated before use in field measurements. In the present work, LR-115 type II plastic track detectors have been calibrated in bare mode in a chamber containing a known radon concentration. The cali bration factor measured for this mode was 125 tracks.cm-2.d-1 = 1 WL (3.12 x 10-2 tracks.cm -2.d-1 = 1 Bq.m-3).
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