Preliminary study of thoron and radon levels in various indoor environments in Slovenia.

Using the Raduet discriminative radon-thoron solid-state nuclear track detectors, a limited number of measurements were recently carried out about 1 m away from any wall and 1.5 m above the floor in different environments in Slovenia. The following thoron and radon ranges were obtained, respectively (Bq m(-3)): 33-700 and 25-4900 in 2 dwellings, 11-215 and 22-422 in 5 kindergartens, 21-368 and 40-4609 in 35 elementary schools, 47-1361 and 92-3280 in 4 hospitals, 4-37 and 10-153 in 9 spas and 800-880 and 4060-6870 in 1 karst cave (2 places). In case of thoron and radon concentrations lognormal distribution was confirmed, while the statistical relationship between them was weak.