Abstract
Measurements of radon concentration, surface and mass exhalation rates were made for 12 types (264 measurements) of building material samples frequently used in Sudan. In this survey, we used the can technique, containing CR-39, to estimate the radon exposure from building materials. The results of radon concentrations in the selected building materials ranged from 506 +/- 79Bq.m(-3) in mud bricks of Aroma area to 128 +/- 39Bq.m(-3) in ceramic material. The surface and mass exhalation rates ranged from 949 +/- 70mBq.m(-2).h(-1), 11.25 +/- 1.76mBq.kg(-1)h(-1) to 240 +/- 35mBq.m(-2)h(-1), 2.84 +/- 0.87mBq.kg(-1).h(-1), respectively. The effective dose was calculated that ranged from 3.59 +/- 1.10 mSv.y(-1) to 14.21 +/- 2.23 mSv.y(-1), for ceramic and mud materials, respectively. These results agreed with similar findings that mud contributes in a higher indoor concentration than the other investigated materials, mud was found to constitute an effective dose above the action level as quoted by the International Commission on Radiological Protection (ICRP).