作者： B Papp , Á Horváth , Á Kiss , G Rajnai
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摘要: One of the most prominent component of natural radioactivity is radon. It always exists everywhere in terrestrial crust and it is a decay product of uranium. Radon-222 is an inert gas whose physical and chemical properties allow to migrate considerable distances. The migration of radon in soil pore space happens on the one hand by diffusion (driven by concentration gradient), and on the other hand by convection (driven by pressure gradient). The radon-222 gas can play a monitoring role in closed volume of geological formation, if one determines properly its concentration. In order to test the idea, the increase of radon concentration versus time, was determined in a borehole of 4, 5 m depth. The hole should be free of radon gas at the start of measurement, and hereafter closed to environmental air exchange.The results of these concentration measurements were compared with the results from a theoretical model of …