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建筑材料中的放射性核素主要来源于铀系、钍系和天然钾，它不仅构成了室内的γ辐射场，而且是室内氡及子体的主要渊源之一。人们有80％的时间在室内，所以建筑材料中的放射性核素含量与人们的生活关系极为密切。近年大量的工业废渣被用于建筑材料的生产，而部份建筑材料的放射
Radionuclides in building materials are mainly derived from uranium, thorium and natural potassium. It not only constitutes the indoor gamma radiation field, but also is one of the main sources of indoor helium and its daughters. People spend 80% of their time indoors, so the content of radionuclides in building materials is very close to people’s lives. In recent years, a large amount of industrial waste has been used for the production of building materials, and some construction materials have been emitted.