Performance of wood and wooden materials as radon sealant

对室内随机浓度情况进行了调查，并与房屋的建筑方法和使用的材料有关。结果表明，木结构房屋的氡浓度低于普通民居。一些rc建筑在高空气密度和空调条件下显示出极高的浓度，超过100 Bq/m^3。考虑到日本未来的住房情况，很明显，rc房将成为普遍的住宅，全空调将广泛普及。需要注意的是，氡浓度高的rc屋数量有所增加。但在施工中不可避免地要使用无机材料。在这种情况下，防止无机材料的氡排放被认为是重要的。本研究旨在了解木材作为日本未来住宅室内氡密封材料的能力。实验结果表明，厚度小于1 mm的薄木质材料可以阻止无机材料30-40%的氡辐射。即使在气体扩散的情况下，薄板也能防止90%以上的氡扩散。我们发现木质材料的改进可以提供良好的室内材料，以防止无机材料的氡排放。

Circumstances of indoor randon concentration were investigated in connection with the method of building construction and used materials in houses.The results revealed that the radon concentration in wooden houses showed lower than that of RC-houses. Some RC-buildings showed extremely high concentration, over 100 Bq/m^3, in cases of high air tightened and air conditioned conditions.Considering Japanese housing situation in the future it would be obvious that RC-house would become common for dwelling and the complete air condition would be widely spread. Then it should be noticed that RC-houses which have high radon concentration increase in the number. But it would be impossible to avoid to use inorganic materials in the construction. At the cases it is considered to be important to prevent radon emanation from inorganic materials.This investigation was carried out to know the ability of wood as radon sealant indoor materials for future housing of Japan.The experimental results showed that thin wooden materials less than 1 mm in the thickness prevent 30-40% radon emanation from inorganic materials. Even in the case of gas diffusion condition the thin boards prevent over 90% of radon diffusion.We found that improvement of wooden materials would make possible to provide a good interior materials which prevented radon emanation from inorganic materials.