During the years 2005 and 2006 a survey on natural radioactivity in about 500 schools located inSouth-East Italy (the Salento peninsula, province of Lecce) has been carried out. In particular average radonconcentration and average absorbed dose rate in air due to gamma radiation have been assessed by using solidstate nuclear track detection (SSNTD) and electret dosimeters, as well as TLD dosimeters, respectively. SSNTDdosimeters were placed in each school, while electrets and thermoluminescence dosimeters (TLD) were added in aselected sample of 56 schools.Moreover during the second semester, in each of 56 schools, two electret dosimeters with the same configurationwere placed, in order to assure the quality in data production – as homogeneity and reliability. In this paper finalresults related with the measurements performed in a selected sample of schools are reported.The indoor radon levels measured in the schools ranged from 61 Bq/m3 to 1326 Bq/m~3, and only six schoolsshowed Rn concentration values over 500 Bq/m3, Italian action level for workplaces. As for the average absorbeddose rate in air due to gamma radiation, the recorded values ranged between 0.41 and 0.73 mGy/y with an averagevalue of 0.57 mGy/y.
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