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氡及其子体密度很大，但在理想空气中具有明显向上运移能力，这不是用外因可以阐述的现象，而有其固有的内因。其机理是：氡及其子体和母体多为α辐射体，它们放出的α粒子减速后成为４Ｈｅ，能与氡及其子体和母体形成复合团簇。氦很轻，当其复合团簇浮力大于重力时，团簇便会自行上升，成为氡及其子体向上运移的内因。据此，不能只以氡的半衰期最长不过３．８２５ｄ来计算氡及其子体的运移距离，而应从团簇的总效应来考虑其效果。而且氡及其子体与氦能形成复合团簇的认识，对其他重金属微粒组成的地气和气溶胶运移研究是有意义的，它们有相似属性。
Radon and its daughters are very dense, but they have obvious upward migration ability in the ideal air. This is not the phenomenon that can be elaborated by external factors, but has its inherent internal cause. The mechanism is: Radon and its progeny and the mother are mostly alpha-emitters, and they release the alpha particles to become 4He after decelerating, which can form complex clusters with radon and its progenies and matrices. Helium is very light. When its complex buoyancy is greater than gravity, the cluster will rise by itself and become the internal cause of the upward migration of radon and its daughters. Accordingly, the radon and its daughters can not be calculated only for the longest half-life of radon, but only 3.825 days, and the effect should be considered from the total effect of the clusters. Moreover, the understanding that radon and its daughters can form complex clusters with helium makes sense for the study of the migration of ground-level gas and aerosol made up of other heavy metal particles, which have similar properties.