The theory of clusters

The theory of the interaction between ions contained in the air and water molecules is described in this paper. The theory considers mainly with interaction of ionised radon decay products and vapour molecules. The theory refers to the range of natural humidity - from 5 percent to 100 percent of air relative humidity. The expected radia of clusters of ion and vapour molecules, their diffusion coefficient and the time of their forming have been calculated as a function of air relative humidity. The conclusions contain the typical predicted features of the radon daughter clusters that can occur in ambient air