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| Titel |
Dependence of radon levels in Postojna Cave on outside air temperature |
| VerfasserIn |
A. Gregorič, A. Zidanšek, J. Vaupotič |
| 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 ; 11, no. 5 ; Nr. 11, no. 5 (2011-05-23), S.1523-1528 |
| Datensatznummer |
250009428
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| Publikation (Nr.) |
 copernicus.org/nhess-11-1523-2011.pdf |
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| Zusammenfassung |
| Postojna Cave is the largest of 21 show caves in Slovenia. The radon
concentration there was measured continuously in the Great Mountain hall from July 2005 to October 2009
and ranged from about 200 Bq m−3 in winter to
about 3 kBq m−3 in summer. The observed seasonal pattern of radon
concentration is governed by air movement due to the difference in external
and internal air densities, controlled mainly by air temperature. The cave
behaves as a large chimney and in the cold period, the warmer cave air is
released vertically through cracks and fissures to the colder outside
atmosphere, enabling the inflow of fresh air with low radon levels. In
summer the ventilation is minimal or reversed and the air flows from the higher
to the lower openings of the cave. Our calculations have shown that the effect
of the difference between outside and cave air temperatures on radon concentration
is delayed for four days, presumably because of the distance of
the measurement point from the lower entrance (ca. 2 km). A model developed
for predicting radon concentration on the basis of outside air temperature
has been checked and found to be successful. |
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