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Radon-prone areas in the Lombard plain
Lucia Sesana1, Giancarla Polla, Ugo Facchini
1Istituto di Fisica Generale Applicata, Università degli Studi di Milano, Via G. Celoria, 16 - 20133 Milano, Italy.
Journal of Environmental Radioactivity
|April 15, 2005
Summary
Indoor radon levels in the Lombard plain depend on geology. Clay-rich soils show low radon, while gravel and sand substrates can lead to high radon flux, especially in winter.
Area of Science:
- Environmental Science
- Geology
- Radiological Protection
Background:
- Indoor radon (Rn) exposure is a significant health concern.
- Geological factors are known to influence radon emissions.
- Understanding local geology is crucial for identifying high-risk areas.
Purpose of the Study:
- To identify radon high-risk areas in the Lombard plain based on geological context.
- To correlate indoor radon concentrations with underlying geological formations.
- To assess radon levels in dwellings across selected villages.
Main Methods:
- Geological stratigraphies were analyzed to map substrate types (gravel, silt, clay).
- Indoor radon measurements were conducted in 411 houses across seven villages.
- Radon concentrations were analyzed in relation to predominant soil types at depths of 0-50 m.
Main Results:
- Dwellings on substrates dominated by clay showed low indoor radon concentrations.
- Areas with a predominance of gravel mixed with sand exhibited high radon flux from underground, particularly during winter.
- Geological substrate significantly influences indoor radon levels.
Conclusions:
- Geological mapping and radon measurements are effective in identifying radon-prone areas.
- Clayey substrates act as a barrier to radon migration, reducing indoor concentrations.
- Gravelly and sandy substrates facilitate radon gas movement, increasing exposure risk, especially in colder months.