Abstract:In this work, we are presenting the results of radium concentration, surface and mass radon exhalation rates for a number of 209 soil samples collected from different locations of Kassala town, Sudan, by using the can technique, containing CR-39. The values of radium concentrations from soil samples were found to be ranging from 3.9 to 34.2 Bq.kg -1 , with an average of 16.3 ± 1.6 Bq.kg -1 . The surface and mass exhalation rates of radon were found to be from 0.84 to 7.35 Bq.m -2 .h -1 and 17 to 148 mBq.kg -1 .h -1 , with an averages of 3.50 ± 0.35 Bq.m -2 .h -1 and 70 ± 7 mBq.kg -1 .h -1 , respectively for the studied soil samples. From the results of this study we found that, there was a good correlation between radium concentration and radon exhalation rates in soil samples. The values of radium concentration determined in soil samples are less than the permissible value of 370 Bq.kg -1 recommended by Organization for Economic Cooperation and Developments, which is acceptable for safe use. Thus, results reveal that the area is safe as far the health hazard effects are concerned. Finally we compare our results with similar findings in different regions of Sudan and among other Countries.