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Radon exposure at schools may have a considerable public health impact. The exposure and respectively the health risk is related with CRn and time. The schools are buildings with public access, where the children spent long period of life. The main objective of the study is to evaluate the indoor radon concentrations as an important air pollutant in school buildings of Kardzhali districts, Bulgaria, as a first step in controlling and reducing the children exposure. The measurement of radon concentration was made i...