Landman K A
Health Phys. 1982 Jul;43(1):65-71. doi: 10.1097/00004032-198207000-00006.
A mathematical model is developed to describe diffusion of radon through cracks or gaps in concrete slabs which are used in building foundations. As radon approaches the soil surface from underlying soil, it encounters a concrete slab. The radon will diffuse toward any air-filled cracks. The rate of exhalation through a portion of a cracked slab is determined and compared to the rate of exhalation from the same surface area of bare soil. In a typical case, this ratio is approx. 0.25. This is about a 20-fold increase to the ratio found when the concrete slab has no cracks. Therefore crack pathways are potentially a major source of indoor radon.
建立了一个数学模型，用于描述氡通过建筑基础中混凝土板的裂缝或间隙的扩散。当氡从下层土壤接近土壤表面时，会遇到混凝土板。氡会向任何充满空气的裂缝扩散。确定了通过有裂缝板的一部分的析出率，并与裸土相同表面积的析出率进行比较。在典型情况下，该比率约为0.25。这比混凝土板无裂缝时的比率增加了约20倍。因此，裂缝通道可能是室内氡的主要来源。
