کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1876519 | 1042018 | 2011 | 9 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Seasonal and daily variation of radon at 10 m depth in borehole, Garhwal Lesser Himalaya, India Seasonal and daily variation of radon at 10 m depth in borehole, Garhwal Lesser Himalaya, India](/preview/png/1876519.png)
Mostly accepted and widely reported radon (Rn222) measurements, a tool for earthquake precursor research, is a part of multi-parametric geophysical observation in the Garhwal Lesser Himalaya for earthquake related studies. Radon is being recorded continuously at an interval of 15 min at 10 m depth in a 68 m deep borehole. Three years high resolution 15 min data at 10 m depth shows a complex trend and has a strong seasonal effect along with some diurnal, semi-diurnal and multi-day recurring trends. A well-defined seasonal pattern is prominent with a high emanation in summer and low values in winter accounting for about a 30% decrease in count values in winter when the atmospheric temperature is very low at this station located 1.90 km above mean sea level. Diurnal, semi-diurnal and multi-day trends in this time-series are mainly observed during April–May and October–November. This is the period of spring and autumn when there is a high contrast in day–night atmospheric temperature. Hence the high fluctuation in Rn concentration is mainly caused by the temperature contrast between the air-column inside the borehole and the atmosphere above the earth's surface.
Journal: Applied Radiation and Isotopes - Volume 69, Issue 7, July 2011, Pages 1070–1078