Fundamental research on the reduction of indoor radon concentration

降低室内氡浓度的基础研究

• 批准号: 02304024
• 负责人: OKUYAMA Takashi
• 金额: $ 2.05万
• 依托单位: Nagoya University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Co-operative Research (A)
• 财政年份: 1990
• 资助国家: 日本
• 起止时间: 1990 至 1991
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-02304024/
• 关键词: Wooden house; Concrete house; Radon; Indoor radon concentration; Ventilation; Radio activity; Inorganic materials; コンクリ-ト; 気密性; 無機建築材料; 屋内空気; 放射能; カップ法; RC住宅

Indoor radon ( ^<222>Rn) concentrations were measured so as to understand the behavior of radon in wooden houses. The number of measured houses was 28 buildings which were located over a wide region from Hokkaido to Kagoshima. The measurement had been carried out for one to three years.The radon concentrations in wooden houses ranged from 3 to 22 Bq/m^3, and those in reinforced concrete houses were from 25 to 46 Bq/m^3 which were about 1.5 times as much as those in the wooden houses. In reinforced concrete buildings, the radon concentrations varied over a range of 21 to 1116 Bq/m^3. The large concentrations are due to radon emanation from many inorganic materials, and from the effect of small ventilation rates. In reinforced concrete buildings and under the floor of wooden houses, the radon concentrations were large from spring to summer. It was made clear that radon emanating from the soil under the floors enters the wooden houses. Therefore, the radon emanation could be reduced by covering the ground under the floors of the wooden houses with concrete or vinyl sheet.In the future, the wooden houses in Japan will become airtight one and the inorganic materials will be used much more, then the radon concentrations will be larger than nowadays like in the reinforced concrete buildings at this time.

为了<222>了解室内氡的行为，对室内氡浓度进行了测量。测量的房屋数量为28栋建筑物，分布在从北海道到鹿儿岛的广阔区域。经1 ~ 3年的测量，木屋内氡浓度为3 ~ 22 Bq/m^3，钢筋混凝土房屋内氡浓度为25 ~ 46 Bq/m^3，约为木屋的1.5倍。在钢筋混凝土建筑物中，氡浓度在21 ~ 1116 Bq/m^3之间变化。高浓度是由于氡从许多无机材料散发，并从小通风率的影响。在钢筋混凝土建筑物和木制房屋的地板下，氡浓度从春季到夏季都很大。很明显，从地板下的土壤中散发出来的氡会进入木制房屋。因此，可以通过在木制房屋的地板下覆盖混凝土或乙烯基薄膜来减少氡的散发。将来，日本的木制房屋将成为密闭的房屋，无机材料将被更多地使用，那么氡的浓度将比现在的钢筋混凝土建筑物更大。

项目成果

H. Watanabe, T. Okuyama, T. Iida and Y. Kanie: "Indoor Concentration of Radon and Its Emanation from Building Materials" J. of Jap. Wood Res. Soc.38. 114-121 (1992)

H. Watanabe、T. Okuyama、T. Iida 和 Y. Kanie：“氡气的室内浓度及其从建筑材料中的散发” J. of Jap。

渡辺拡,奥山剛,飯田孝夫,蟹江洋子: "建造物内でのラドン濃度と建材からのラドン散逸" 木材学会誌. 38. 114-121 (1992)

Hiroshi Watanabe、Tsuyoshi Okuyama、Takao Iida 和 Yoko Kanie：“建筑物中的氡气浓度和建筑材料中的氡气消散”日本木财学会杂志 38. 114-121 (1992)。