Abstract

Alpha‐ray ionization is perhaps the most variable single component of the ionization of the lower atmosphere. Many measurements have been made to determine the ionization from airborne sources of alpha rays. This depends principally on the amount of radon and thoron in the atmosphere. An attempt is made here to evaluate the role of alpha rays originating from the surface of the ground and other naturally occurring surfaces. It was found that about ten per cent of the small ions observed at one meter above ground are originally produced at the ground and carried upward by convection

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