Attachment of radon decay products to aerosol particles

Attachment of radon decay products to aerosol particles 

Attachment is mainly by diffusion. If the decay products are ions, electrostatic attraction to charged nuclei of opposite sign has a small additional effect. The rate constant for attachment, Xa, is given by an equation originally applied to evaporation from small droplets, 

N is the number of condensation nuclei per unit volume of air, r is their radius, 

Vm = RT127Vis the component of mean kinetic velocity of vapour molecules 

T is the absolute temperature, and M is the molecular weight of decay products. 

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