Abstract
The relative contributions to indoor radon, 222 Rn, of various sources in twenty-three rooms of three kinds in Taiyuan area are presented. The results show that the major sources in this area are radon emanation from surfaces of soil and building materials and from outdoor air, while the contribution of water and gas consumed in the rooms is less important. These results suggest a basis for taking suitable protective measures against indoor radon. Some materials are also recommended which are effective in restraining radon exhalation and low in price. More than ten kinds of materials, such as painting materials, polyvinyl alcohol (CH 2 :CHOH) n , etc, were tested and compared using a cost-effectiveness analysis technique. Their sealing effects on radon exhalation were examined with a home-made Radon Exhalation Monitor. The deposition effects of negative ion generator and humidifier on radon progeny were also tested. The maximum deposition may reach 70-90%, which proves they are also effective and economical in radon protection.
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