Soil samples, from 70 points uniformly distributed over entire Slovenia, were analysed for K-40, Th-232 and Ra-226 using gamma spectrometry, and for U-234 and U-238 using alpha spectrometry. The following ranges and averages of activity concentrations (Bq kg(-1)) were obtained: 98-2600 and 800 +/- 520 for K-40, 9-170 and 77 +/- 33 for Th-232, 12-270 and 63 +/- 44 for Ra-226, 12-84 and 34 +/- 19 for U-234, and 11-90 and 34 +/- 19 for U-238. With respect to lithology, the highest average values for K-40 and Th-232 were found at clastic sediments containing clay and for Ra-226 on carbonate rocks. Based on the measured activity concentrations, terrestrial gamma dose rates were calculated. The total dose rate ranged from 15 to 260 nGy h(-1), with arithmetic mean of 110 +/- 49 nGy h(-1), being the highest over carbonates. (c) 2013 Elsevier Ltd. All rights reserved.