Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010geoji.182..829b&link_type=abstract
Geophysical Journal International, Volume 182, Issue 2, pp. 829-842.
Astronomy and Astrophysics
Astronomy
Time-Series Analysis, Wavelet Transform, Fracture And Flow
Scientific paper
Radon is a naturally occurring radioactive noble gas generated within mineral grains of uranium bearing rocks by alpha decay from radium. The Amram tunnel (A. Bloch Geophysical Observatory) is a particularly suitable location for the investigation of radon variability. Located in the arid environment of the Arava desert, near Elat, the 170 m tunnel that constitutes the observatory enables radon monitoring in a desert environment and under fairly stable environmental conditions. The analysis of the temporal variability of continuous measurements of radon and environmental parameters at the Amram tunnel over a period of several years shows a complex temporal pattern characterized by non-stationary and multiscale features. Radon concentrations exhibit multiyear variability in the form of a increasing trend of ~1000 Bqm-3yr-1 in the mean and much larger trends up to ~2500 Bqm-3yr-1 in the maximum radon levels. Radon concentrations also display strong seasonal patterns, with maxima in summer and minima in winter, ranging from 2.5 kBqm-3 in winter to 35 kBqm-3 in summer. Intraseasonal variability is characterized by very large radon anomalies, with sharp increases of more than 20 kBqm-3 relative to the base level, that occur in spring and summer and last for several days. Daily periodic variability with maxima around midnight appears also in spring and summer, being absent in the cold months. Radon variability at seasonal, intraseasonal and daily timescales is associated with the air temperature outside the tunnel, specifically the temperature gradient between the external environment and the more stable environment inside the tunnel where the measurements are performed.
Barbosa Marconi Soares
Malik Usha
Piatibratova O.
Zafrir H.
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