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Unusually high indoor radon concentrations from a giant rock slide
O Ennemoser1, W Ambach, P Brunner
1Institute of Medical Physics, University of Innsbruck, Austria.
The Science of the Total Environment
|July 18, 1994
Summary
High indoor radon levels in Umhausen, Austria, linked to local geology, show a significant increase in lung cancer mortality. This study investigates the source and impact of elevated radon gas in the community.
Area of Science:
- Environmental Science
- Public Health
- Geology
Background:
- Unusually high indoor radon concentrations were detected in Umhausen, a village in western Tyrol, Austria.
- Median radon levels reached 3750 Bq/m3 in basements and 1160 Bq/m3 on ground floors during winter.
Purpose of the Study:
- To investigate the cause of exceptionally high indoor radon levels in Umhausen.
- To determine the relationship between these radon concentrations and lung cancer mortality in the affected population.
Main Methods:
- Radon concentrations were measured indoors (basements and ground floors) across seasons.
- Radon exhalation rates from soil and radium content in rock samples were analyzed.
- Lung cancer mortality rates in Umhausen were compared to the general population of Tyrol.
Main Results:
- The high radon levels are attributed to the village's location on a fractured granitic gneiss rockslide.
- Median soil radon exhalation rate was 0.4 Bq/m2/s, with median radium content of 125 Bq/kg in rock samples.
- A statistically significant increase in lung cancer mortality (SMR=3.9) was observed in Umhausen compared to Tyrol.
Conclusions:
- The fractured rockslide is identified as the primary source of the elevated radon gas.
- High indoor radon exposure in Umhausen is associated with increased lung cancer risk.
- Geological factors can significantly impact public health through radon contamination.