Abstract
People living near uranium mine tailings, uranium mill tailings and the ventilation shaft of uranium mine are exposed to 222Rn and its short-lived daughters from general soil areas and those from specific sites. Therefore, it is necessary to descriminate between them to a certain degree.The diurnal variations of the 222Rn concentration in outdoor air, which is assumed to be in radioactive equilibrium with its short-lived daughters, are observed at three times by measuring 214Po using a surface-barrier detector at Okayama-shi and at Kamisaibara-mura. The heights of Okayama-shi and Kamisaibara-mura are about 1m and about 710m above sea level, respectively. Furthermore, some meteorological elements are simultaneously observed.It becomes clear that the levels and the variation patterns of the 222Rn concentration and the relationships between the 222Rn concentration and some meteorological elements are the same as the other sites except one run. Therefore, these suggest that it is possible to develop the method for the distinction between 222Rn and its short-lived daughters from the general soil areas and those from the specific sites without consideration of the height of the ground above sea level except the period of snowfall.
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