Maged A F, Ashraf F A
National Centre for Radiation Research and Technology, Atomic Energy Authority, P. O. Box 29, Nasr City, Cairo, Egypt.
Environ Geochem Health. 2005 Sep;27(5-6):485-9. doi: 10.1007/s10653-005-5332-5.
Indoor radon has been recognized as one of the health hazards for mankind. Common building materials used for construction of houses, which are considered as one of the major sources of this gas in indoor environment, have been studied for exhalation rate of radon. Non-nuclear industries, such as coal fired power plants or fertilizer production facilities, generate large amounts of waste gypsum as by-products. Compared to other building materials waste gypsum from fertilizer production facilities (phosphogypsum) shows increased rates of radon exhalation. In the present, investigation solid state alpha track detectors, CR-39 plastic detectors, were used to measure the indoor radon concentration and the radon exhalation rates from some building materials used in Egypt. The indoor radon concentration and the radon exhalation rate ranges were found to be 24-55 Bq m(-3 )and 11-223 mBq m(-2) h(-1), respectively. The effective dose equivalent range for the indoor was found 0.6-1.4 mSv y(-1). The equilibrium factor between radon and its daughters increased with the increase of relative humidity.
室内氡已被公认为对人类健康的危害之一。用于建造房屋的常见建筑材料被认为是室内环境中这种气体的主要来源之一，人们已对其氡析出率进行了研究。非核工业，如燃煤发电厂或化肥生产设施，会产生大量废石膏作为副产品。与其他建筑材料相比，化肥生产设施产生的废石膏（磷石膏）的氡析出率更高。在本次调查中，使用固态α径迹探测器CR-39塑料探测器来测量埃及使用的一些建筑材料的室内氡浓度和氡析出率。发现室内氡浓度和氡析出率范围分别为24 - 55 Bq m(-3)和11 - 223 mBq m(-2) h(-1)。发现室内的有效剂量当量范围为0.6 - 1.4 mSv y(-1)。氡与其子体之间的平衡因子随相对湿度的增加而增加。
