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Natural Hazards and Earth System Sciences An interactive open-access journal of the European Geosciences Union
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Volume 10, issue 4
Nat. Hazards Earth Syst. Sci., 10, 895–899, 2010
https://doi.org/10.5194/nhess-10-895-2010
© Author(s) 2010. This work is distributed under
the Creative Commons Attribution 3.0 License.

Special issue: Radon, health and natural hazards

Nat. Hazards Earth Syst. Sci., 10, 895–899, 2010
https://doi.org/10.5194/nhess-10-895-2010
© Author(s) 2010. This work is distributed under
the Creative Commons Attribution 3.0 License.

  23 Apr 2010

23 Apr 2010

Radon concentration in soil gas and radon exhalation rate at the Ravne Fault in NW Slovenia

J. Vaupotič1, A. Gregorič1, I. Kobal1, P. Žvab2, K. Kozak3, J. Mazur3, E. Kochowska3, and D. Grządziel3 J. Vaupotič et al.
  • 1Jožef Stefan Institute, Ljubljana, Slovenia
  • 2Faculty of Natural Sciences and Engineering, University of Ljubljana, Ljubljana, Slovenia
  • 3The Henryk Niewodniczañski Institute of Nuclear Physics, Polish Academy of Science, Kraków, Poland

Abstract. The Ravne tectonic fault in north-west (NW) Slovenia is one of the faults in this region, responsible for the elevated seismic activity at the Italian-Slovene border. Five measurement profiles were fixed in the vicinity of the Ravne fault, four of them were perpendicular and one parallel to the fault. At 18 points along these profiles the following measurements have been carried out: radon activity concentration in soil gas, radon exhalation rate from ground, soil permeability and gamma dose rate. The radon measurements were carried out using the AlphaGuard equipment, and GammaTracer was applied for gamma dose rate measurements. The ranges of the obtained results are as follows: 0.9–32.9 kBq m−3 for radon concentration (CRn), 1.1–41.9 mBq m−2 s−1 for radon exhalation rate (ERn), 0.5–7.4×10-13 m2 for soil permeability, and 86–138 nSv h−1 for gamma dose rate. The concentrations of 222Rn in soil gas were found to be lower than the average for Slovenia. Because the deformation zones differ not only in the direction perpendicular to the fault but also along it, the behaviour of either CRn or ERn at different profiles differ markedly. The study is planned to be continued with measurements being carried out at a number of additional points.

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