Indoor radon measurements were carried out in 30 elementary schools in Tunis, the capital
city of Tunisia, during the winter months of December 2008 to early March 2009. Two
classrooms, one each from ground floor and first floor were chosen from each school making
a total of 60 classrooms. In some of the classrooms, two detectors (open and closed) were
used to measure the concentrations of radon as well as radon and its progeny to allow the
calculations of the equilibrium factors. Nuclear track detectors type LR-115 (Kodalpha)
were used for the measurements. The results show that the radon concentration levels are
low 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 for
teachers while the range for pupils was from 0.019–0.525 mSv y-1. These values
are within the ICPR recommended values.