Site specific radon regimes of a cave system

Hakl, J. and Hunyadi, I. and Csige, I. and Géczy, G. and Bolner-Takàcs, K. (1999) Site specific radon regimes of a cave system. Il nuovo cimento C, 22 C (3-4). pp. 471-474. ISSN 1826-9885

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The spatial and temporal variation of air-borne 222Rn concentration was continuously measured during 1990-94 with monthly changed etched track detectors in the Pál-völgy and Mátyás-hegy caves, Budapest, Hungary in order to identify site-specific behaviour of radon variations. We found winter minimum and summer maximum levels at each measuring site. In the Pál-völgy cave these end values increased with the distance from the entrance. The maximum-to-minimum ratio, however, showed a broad peak between the entrance and deep cave region. This behaviour can be attributed to the seasonal and depth dependence pattern of the advective dilution effect caused by intrusion of outside radon free air. Far from the entrance radon concentration goes to a saturation value, which approaches the level found in a highly unventilated remote cavity of the cave. In the Mátyás-hegy cave the maximum-to-minimum ratios were small and nearly constant, indicating that the measuring sites belong to deeper parts of the system. The higher maximum values, on the other hand, are attributed to smaller passage sizes of this part. High similarity was found in the temporal variation of radon concentration in the neighbouring parts of the two caves, which reinforced the assumed but by man unpenetrable connection between them.

Item Type: Article
Additional Information: Paper presented at the “Fourth International Conference on Rare Gas Geochemistry”, Rome, October 8-10, 1997.
Uncontrolled Keywords: Air quality and air pollution; radiation detectors; conference proceedings
Subjects: 300 Scienze sociali > 360 Problemi e servizi sociali; associazioni > 363 Altri problemi e servizi sociali > 363.7 Problemi ambientali (classificare qui la tutela ambientale; l’effetto dei rifiuti, dell’inquinamento, delle iniziative per controllarli) > 363.73 Inquinamento > 363.739 Inquinamento di specifici ambienti > 363.7392 Inquinamento atmosferico
Depositing User: Marina Spanti
Date Deposited: 11 Oct 2019 12:45
Last Modified: 11 Oct 2019 12:45

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