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Radon in outdoor air in Nevada
J G Price1, J G Rigby, L Christensen
1Board on Earth Sciences and Resources, National Research Council/HA 372, Washington, DC 20007.
Health Physics
|April 1, 1994
Summary
Outdoor radon levels in Nevada are similar to national averages, with variations linked to local geology. Silica-rich rocks like granite are primary sources, and outdoor radon correlates with soil gas radon.
Area of Science:
- Environmental Science
- Geology
- Radiological Health
Background:
- Radon (Rn) is a naturally occurring radioactive gas.
- Understanding radon distribution is crucial for public health.
- Previous studies established national radon benchmarks.
Purpose of the Study:
- To measure outdoor radon concentrations across Nevada.
- To correlate radon levels with geological factors.
- To identify sources of elevated radon in outdoor air.
Main Methods:
- Conducted radon measurements at 50 diverse sites in Nevada.
- Analyzed radon concentrations in outdoor air at various heights (0.5, 1.0, 2.0 m).
- Correlated air radon with soil gas radon, soil types, and rock composition (uranium/progeny).
Main Results:
- Nevada's statewide median outdoor radon concentration (15 Bq m-3) matches the national median.
- Observed a wide range of radon levels (2.6–52 Bq m-3).
- Silica-rich igneous rocks (rhyolites, granites) identified as key sources of high outdoor radon.
Conclusions:
- Outdoor radon levels in Nevada are comparable to national averages.
- Local geology, particularly silica-rich rocks, significantly influences outdoor radon.
- Outdoor radon concentrations reflect local geology and correlate with soil gas radon levels.