Sorimachi A, Tokonami S, Omori Y, Janik M, Iwaoka K, Ishikawa T, Sun Q
National Institute of Radiological Sciences, National Institutes for Quantum & Radiological Science and Technology, 4-9-1 Anagawa, Inage, Chiba, Japan.
National Institute for Radiological Protection and Nuclear Safety, 2 Xinkang Street, Deshengmenwai, Xicheng District, Beijing, China.
Radiat Prot Dosimetry. 2019 Oct 1;184(3-4):457-462. doi: 10.1093/rpd/ncz100.
Short-term measurements were made in four different types of Chinese cave dwellings, 'ground', 'open-cut', 'aboveground' and 'underground', located in Gansu Province, China, in order to evaluate the diurnal and seasonal variations in indoor radon (222Rn) and thoron (220Rn) concentrations. As a result, in most of the 'ground' and 'open-cut' cave dwellings in summer, the indoor 222Rn concentrations during the nighttime were higher than those during the daytime. In the winter, such fluctuation was not observed. The daily indoor 222Rn concentrations in summer were higher than those in winter, excluding the 'aboveground' cave dwelling, and these concentrations depended on dwelling type, exhalation from the building materials and ventilation. In contrast with 222Rn, there seemed to be only very slight clear variations in 220Rn.
为评估中国甘肃省四种不同类型的窑洞（“地面式”、“明挖式”、“地上式”和“地下式”）内氡（²²²Rn）和钍射气（²²⁰Rn）浓度的昼夜和季节变化，进行了短期测量。结果显示，夏季大多数“地面式”和“明挖式”窑洞夜间的室内²²²Rn浓度高于白天。冬季未观察到这种波动。除“地上式”窑洞外，夏季室内²²²Rn的日浓度高于冬季，且这些浓度取决于窑洞类型、建筑材料的析出率和通风情况。与²²²Rn不同，²²⁰Rn似乎只有非常轻微的明显变化。
