Abstract
The rate of radon (222Rn) and thoron (220Rn) exhalation from the ground was measured in the yard of our laboratory to investigate effects of soil conditions on the exhalation; radon and thoron gases released from the ground were directly adsorbed on granular-activated charcoal, and the charcoal was subjected to γ ray spectrometry to estimate the activity of adsorbed radon and thoron gases. Although the rate of radon exhalation was not appreciably changed by a light rainfall, it apparently decreased after a heavy rainfall and remained low for several days. No appreciable seasonal difference was found in the radon exhalation. On the other hand, the thoron exhalation decreased more or less after every rainfall and depended strongly on the moisture of a thin surface soil layer. The rate of thoron exhalation in summer was about twice its value in winter.
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