直到70年代后期,氡及其子体产物被认为是仅在铀的开采和水冶中遇到的辐射健康危害。然而,在世界许多地区进行的室内氡普查结果大大改变了这一看法。例如,在温带地区的一些国家中,已注意到居室的氧气浓度增加,这些地区严格的节能措施促使居民紧闭门窗,尤其是在寒冷的 It was not until the late 1970s that radon and its daughter products were considered to be radiation health hazards encountered only in uranium mining and hydrometallurgy. However, the results of the indoor radon survey conducted in many parts of the world have greatly changed this view. For example, in some temperate regions, increased concentrations of oxygen in homes have been noted, and stringent energy-saving measures in these areas have prompted residents to close windows and doors, especially in cold