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Report No.
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Diurnal and seasonal variations in $$^{222}$$Rn concentration profile in soil

Iskandar, D.*; Yamazawa, Hiromi*; Yamasoto, Kotaro ; Ota, Masakazu*; Koarashi, Jun  ; Moriizumi, Jun*; Bunawas*; Iida, Takao*

The $$^{222}$$Rn concentrations in soil and $$^{222}$$Rn flux were measured at 6 depths in soil to analyze the seasonal- day-to-day and diurnal variations. The variations of $$^{222}$$Rn concentrations in soil were larger in shallow depths. It seems that the $$^{222}$$Rn concentration in soil during night-time was slightly lower than day-time especially at depth of 15 cm. The precipitation may have affected the concentration insoil differently depending on its amounts. The large decrease in air pressure during one day increased the concentration in soil at shallow soil layers. The effect of soil water content on $$^{222}$$Rn concentration in soil was also observed.

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