Abstract
On account of α-ray emission from rocks and other soil material the ionization within the first 10 cm above ground is more intense than further up. These ions are carried upward by eddy currents until they disappear by recombination. The theory of mass exchange by eddy currents was used to compute the average number of ions present at different levels above the ground assuming the validity of Schweidler’s linear recombination law for small ions. The number of α-particles emitted from the ground was determined by means of a scintillation counter (photomultiplier) for various rocks, soil materials and vegetation and it was found that the contribution of ions produced near the ground and carried upward to the 100 cm level is not negligible. It may amount to nearly 10 per cent of the total number of ions present at this level.
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