氡及其子体向上运移的内因与团簇现象

INTERNAL CAUSES OF RADON AND ITS DAUGHTERS UPWARD MIGRATION AND CLUSTER PHENOMENON

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 have a very big specific gravity. But under laboratory conditions, they have the ability to migrate upward. The phenomenon can’t be interpreted by an external cause but by an internal cause. The mechanism is that radon and most of its daughters and parents are decaying bodies able to radiate α particles. After deceleration , 4He can combine with radon and its daughters and parents to form clusters. When the buoyancy of air is greater than the gravity of the clusters, self ascending occurs. Accordingly, the distance that Rn covered during 3.825 days (Rn half life) should not be regarded as Rn and its daughters migrating distance, but should be calculated according to all effects. That clusters can be formed by 4He , Rn and its daughters is valuable to study because of the similarity between Rn and heavy metal particles.