[en] Indoor radon concentrations in the kindergartens of Osijek were measured with alpha-scintillation cells, LR-115 nuclear track detectors, as well as a Radhome semiconductor detector, and average values of 50.2, 43.7 and 47 Bq m^-3 were obtained. Under the worst conditions, the annual radon effective dose equivalent was 10 mSv per year. Using the bare and filtered LR-115 detectors, the average equilibrium factor was assessed as 0.36, indoors. Measurements of the gamma dose rate in the kindergartens did not show any significant correlation with radon concentrations. (Author)