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The characteristic peaks of 1 day period and 1 year period were obtained through the Fourier analysis of atmospheric 222Rn concentration in Kobe. The 222Rn concentration showed the diurnal variation and seasonal variation.The inverse relationship between the diurnal variation of the relative concentration of 222Rn and atmospheric temperature was obtained, because the 222Rn concentration at ground level in Kobe is affected strongly by the mixing of atmosphere. The representative times were approximately 9: 00 and 19: 00.The seasons which the highest and lowest concentration occurred in Kobe were winter and summer, respectively. The seasonal variation depended only on the contribution of the distant component. The highest 222Rn concentration in Kobe was observed in winter, because the seasonal wind transports the air masses including high 222Rn concentration.

The Variation of Atmospheric 222Rn Concentration in Kobe.