Indoor radon measurements were carried out in 30 elementary schools in Tunis, the capitalcity of Tunisia, during the winter months of December 2008 to early March 2009. Twoclassrooms, one each from ground floor and first floor were chosen from each school makinga total of 60 classrooms. In some of the classrooms, two detectors (open and closed) wereused to measure the concentrations of radon as well as radon and its progeny to allow thecalculations of the equilibrium factors. Nuclear track detectors type LR-115 (Kodalpha)were used for the measurements. The results show that the radon concentration levels arelow in the range of 6–169 Bq m-3 with a mean value of 26.9 Bq m-3.The annual effective dose was found to vary between 0.025–0.715 mSv y-1 forteachers while the range for pupils was from 0.019–0.525 mSv y-1. These valuesare within the ICPR recommended values.
