Development of wood materials as a radon sealant

开发木质材料作为氡气密封剂

基本信息

批准号：
07556041
负责人：
OKUYAMA Takashi
金额：
$ 6.08万
依托单位：
Nagoya University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (A)
财政年份：
1995
资助国家：
日本
起止时间：
1995 至 1997
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07556041/
关键词：
radon wooden materials radon sealant reduction rate of radon diffusion coefficient activated charcoal gypsum board interior materials ラドン拡散係数 MDF アクリル樹脂系塗料ラドン吸着室内放射能内装材木造住宅電離箱無機建材

项目摘要

Concrete and other inorganic construction materials emanate radon, which has radio-activity and stays in the air tightened room. It is said that people is affected by radioactivity and has a risk of lung cancer when they live in the room of a high radon concentrations for long time.The aim of this research is to seal the radon emanation from inorganic materials by using wooden materials as a radon sealant. It is expected that wooden materials reduce the radioactivity of radon during diffusing through wooden materials, because of its short half decay time of 40 minutes.Two methods were employed to evaluate the performance of radon sealant of wooden materials. A contract method ; As a sample block, an inorganic material board with high radon emanation were sandwiched with two wooden boards, surface to surface, and the edge was sealed with a glue. Radon concentration in a desiccator setting the sample block was monitored with a cup method. A non-contract method ; Radon concentrations was measured in the chambers separated by a sample board. Radon source was put in the one side of the chambers.As the results,1. Radon concentrations was reduced with the increases in the thickness of the sample. The order of the reduction rate from the highest reduction was soft wood plywood, lauan plywood, particle board and MDF.2. The reduction rate of MDF with 2.8mm thickness was 17% but the acrylic coating rose the reduction rate to 89%. 3. The wooden materials gave 7-30x10^<-5> cm^2/s as the diffusion coefficient of radon. 4. Charcoal reduces the radon emanation from the gypsum powder. The radon emanation of gypsum mixed with 15% of activated charcoal was reduced to 90%, and that of the mixture with charcoal of fir fiber was 70%.This study gave a possibility to develop a new interior materials which has high performance of radon sealant. Now we are evaluating the performance of the new gypsum board which was manufactured basing on this research.

混凝土和其他无机建筑材料会散发出具有放射性的氡气，并滞留在空气密闭的房间中。据说，人长期生活在氡气浓度较高的房间里，会受到放射性的影响，有患肺癌的危险。本研究的目的是利用木质材料作为材料，封堵无机材料的氡气散发。氡气密封剂。由于木质材料半衰变时间较短，为40分钟，因此有望降低氡在木质材料中扩散过程中的放射性。采用两种方法评价木质材料氡气密封剂的性能。合同法；作为样品块，将高氡气散发量的无机材料板与两块木板面对面夹在中间，并用胶水密封边缘。使用杯法监测设置样品块的干燥器中的氡浓度。非合同方式；在由样品板隔开的室中测量氡气浓度。氡源置于室的一侧。结果： 1．氡浓度随着样品厚度的增加而降低。减少率从最高减少量依次为软木胶合板、柳安胶合板、刨花板和中密度纤维板。2． 2.8mm厚度的MDF的减少率为17%，但丙烯酸涂层将减少率提高到89%。 3.木质材料的氡扩散系数为7-30×10^-5cm^2/s。 4.木炭减少石膏粉的氡气散发。石膏中掺入15%活性炭的氡气散发量降低至90%，而掺入杉木纤维木炭的石膏氡气释放量为70%。本研究为开发高性能氡气密封剂的新型内饰材料提供了可能。现在我们正在评估基于这项研究制造的新型石膏板的性能。