一种适于湿热环境的防氡涂层

摘要

T he radon prevention performance of a new self-made radon prevention coat-ing was researched in the radon contamination provided by the releasing radon modules . With coating thickness of 0.8 mm ,the radon mitigation efficiency in 1# radon module concentration is optimal when the addition of defoaming agent is 0.3% (mass fraction) . The radon mitigation efficiency increases with the coating thickness when the defoaming agent of 0.3% is added ,but the radon mitigation efficiency tends to be stable as the coating thickness is more than 2.0 mm .The radon mitigation efficiency of radon preven-tion coating appended precipitated barium sulphate decreases obviously ,and the addition of ash calcium ,w hite cement and gesso don’t decrease radon mitigation efficiency .T he addition of w hite cement and gesso addition affects the radon prevention stability ,w hile radon mitigation efficiency of radon prevention coating with ash calcium keeps a good performance .Under the hot and humid environment ,the radon prevention coating still has good radon mitigation efficiency in 2# radon module concentration .%利用自制的防氡涂料，在释氡模块氡提供的辐射环境下，对防氡涂层的防氡性能和防氡稳定性进行了研究。结果表明：在1＃释氡模块氡辐射环境下，涂覆0.8 mm厚的防氡涂层，消泡剂的较佳添加量为0.3％（质量分数，下同）。在消泡剂添加量为0.3％时，随着涂覆厚度的增加，防氡效率提高，当涂覆厚度大于2.0 mm后，防氡效率趋于稳定。在分别添加灰钙、白水泥、石膏和沉淀硫酸钡4种快干助剂的防氡涂层中，仅添加沉淀硫酸钡的防氡涂层的防氡效率明显下降，而添加其他3种快干助剂对防氡涂层的防氡效率基本无影响。在防氡稳定性中，白水泥和石膏的加入在一定程度上降低了防氡涂层的防氡稳定性，而添加灰钙对防氡涂层的防氡稳定性几乎无影响。在湿热和2＃释氡模块氡辐射环境下，防氡涂层仍具有良好的耐湿热老化和防氡性能。