摘要
为了研究降低香港高层混凝土建筑物室内 2 2 2 Rn和 2 2 0 Rn水平的新方法——墙体减压法 ,香港大学建造了一个专用实验室。通过实验室墙体内的孔洞 ,用抽气法 (降低墙体内的压力 )将墙体中的 2 2 2 Rn和 2 2 0 Rn排走 ,从而可以减少 2 2 2 Rn和 2 2 0 Rn从内墙表面的析出。用吸收体法测 2 2 0 Rn剂量计测量了内墙表面的 2 2 0 Rn析出率随墙体中压力和随测点距抽气孔位置变化的规律。测量结果表明 ,墙体减压法也可以降低内墙表面的 2 2 0 Rn析出率 ,但与降低 2 2 2 Rn析出率相比 。
A special laboratory was built for the research on 222 Rn and 220 Rn mitigation by depressurization of concrete wall of high rise buildings in Hong Kong. Reduction of 222 Rn and 220 Rn exhalation rate from concrete wall was studied by embedding tunnels in a concrete wall and pumping away the 222 Rn and 220 Rn in the wall. The reduction in exhalation rate was quantified against the applied depressurization and the distance from the pumping tunnel. 220 Rn exhalation rate was measured by passive and integration 220 Rn dosimeters with absorber. Results show that 220 Rn exhalation rate from concrete wall can be reduced by applying depressurization, but the effectiveness is lower than that of 222 Rn. (
出处
《辐射防护》
CAS
CSCD
北大核心
2001年第5期304-308,共5页
Radiation Protection
