【摘要】 综述了建筑物内钍射气２２０ Ｒｎ 的来源和性质，讨论了建筑物内２２０ Ｒｎ 浓度的模型及其对人类的危害风险评估，探讨了建筑物内２２０ Ｒｎ 浓度的测量方法，提出了降低建筑物内２２０ Ｒｎ 浓度的措施。更多还原

【Abstract】 The sources and characters of thoron 220 Rn in the buildings, the pattern of indoor thoron 220 Rn’s concentration and the assessment of hazard which it brings to human being are discussed,and the method of measurement of indoor thoron’s concentration is expounded and the measure for reducing thoron 220 Rn in the buildings is also pointed out.更多还原