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Preprints
https://doi.org/10.5194/sed-4-1511-2012
© Author(s) 2012. This work is distributed under
the Creative Commons Attribution 3.0 License.
https://doi.org/10.5194/sed-4-1511-2012
© Author(s) 2012. This work is distributed under
the Creative Commons Attribution 3.0 License.

  14 Dec 2012

14 Dec 2012

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This preprint was under review for the journal SE but the revision was not accepted.

Influence of a component of solar irradiance on radon signals at 1 km depth, Gran Sasso, Italy

G. Steinitz1, O. Piatibratova1, and N. Charit-Yaari2 G. Steinitz et al.
  • 1Geological Survey of Israel, Jerusalem, Israel
  • 2MadaTech Israel National Museum of Science, Technology and Space, Daniel and Matilde Recanati Center (ra), Haifa, Israel

Abstract. Exploratory monitoring of radon is conducted at one location at the deep underground Gran Sasso National Laboratory (LNGS). Measurements (15-min resolution) are performed over a time span of ca. 600 days in the air of the surrounding calcareous country rock. Utilizing both alpha and gamma-ray detectors systematic and recurring radon signals are recorded. Two primary signal types are determined: (a) non-periodic Multi-Day (MD) signals lasting 2–10 days, and (b) Daily Radon (DR) signals – which are of a periodic nature exhibiting a primary 24-h cycle. The local ancillary environmental conditions (P, T) seem not to affect radon in air monitored at the site. Long term patterns of day-time measurements are different from the pattern of night-time measurements indicating a day-night modulation of gamma radiation from radon in air. The phenomenology of the MD and DR signals is similar to situations encountered at other locations where radon is monitored with a high time resolution in geogas at upper crustal levels. In accordance with recent field and experimental results it is suggested that a components of solar irradiance is affecting the radiation from radon in air, and this influence is further modulated by the diurnal rotation of Earth. The occurrence of these radon signals in the 1 km deep low radiation underground geological environment of LNGS provides new information on the time variation of the local radiation environment. The observations and results place the LNGS facility as a high priority location for performing advanced investigations of these geophysical phenomena, due to its location and its infrastructure.

G. Steinitz et al.

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G. Steinitz et al.

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