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| Titel |
Reasons for large fluctuation of radon and CO2 levels in a dead-end passage of a karst cave (Postojna Cave, Slovenia) |
| VerfasserIn |
A. Gregorič, J. Vaupotič, F. Gabrovsek |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1561-8633
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| Digitales Dokument |
URL |
| Erschienen |
In: Natural Hazards and Earth System Science ; 13, no. 2 ; Nr. 13, no. 2 (2013-02-08), S.287-297 |
| Datensatznummer |
250017568
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| Publikation (Nr.) |
 copernicus.org/nhess-13-287-2013.pdf |
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| Zusammenfassung |
| Measurements of radon concentration were performed at three
geomorphologically different locations in Postojna Cave, Slovenia. In the
part of the cave open to visitors, annual average radon activity
concentrations of 3255 ± 1190 Bq m−3 and 2315 ± 1019 Bq m−3 were found at the lowest point (LP) and in the Lepe jame
(Beautiful Caves, BC), respectively. A much higher average of 25 020 ± 12 653 Bq m−3 was characteristic of the dead-end passage Pisani rov
(Gaily Coloured Corridor, GC), in which CO2 concentration also reached
very high values of 4689 ± 294 ppm in summer. Seasonal variations of
radon and CO2 levels in the cave are governed by convective airflow,
controlled mainly by the temperature difference between the cave and the
outside atmosphere. The following additional sources of radon and CO2
were considered: (i) flux of geogas from the Earth's crust through fractured
rocks (radon and CO2 source), (ii) clay sediments inside the passage
(radon source) and (iii) the soil layer above the cave (radon and CO2
source). |
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