Abstract
Radon is the second most common cause of lung cancer after smoking. In this current work, the concentration of radon gas was measured by CR-39 detectors in the internal buildings of the university compound for female students in a Mahalia. The results showed that the average radon concentration ranged from 312.08 +/- 58.76 Bq/m(3) in the different buildings. The main value for the average effective dose exposure E-eff (WLM/y) was 1.14 +/- 20. All concentration values were close to the upper limit of the internationally permissible level. The results show that all values are within the recommended limits.