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A Geologically Based Indoor-Radon Potential Map of Kentucky.
William C Haneberg1, Amanda Wiggins2, Douglas C Curl1
1Kentucky Geological Survey University of Kentucky Lexington KY USA.
Geohealth
|December 7, 2020
Summary
This study mapped indoor radon potential across Kentucky using 71,930 home test results and geologic data. Limestone and dolostone formations showed higher radon levels, with a statewide map now available.
Area of Science:
- Environmental Science
- Geology
- Public Health
Background:
- Radon is a naturally occurring radioactive gas that can accumulate in homes.
- Indoor radon exposure is a significant risk factor for lung cancer.
- Geological formations are known to influence radon emanation and indoor concentrations.
Purpose of the Study:
- To create a statewide, geologically-based indoor radon potential map for Kentucky.
- To identify geological formations associated with elevated indoor radon levels.
- To provide a tool for public health officials and homeowners to assess radon risk.
Main Methods:
- Combined 71,930 short-term home radon test results with 1:24,000-scale bedrock geologic map data for Kentucky.
- Analyzed radon concentrations in relation to 106 identified geological formations.
- Classified formations into five radon-geologic potential classes based on 75th percentile radon concentrations.
Main Results:
- Indoor radon concentrations were positively skewed, with a mean of 266 Bq/m³.
- Limestone (median 170 Bq/m³) and dolostone (median 130 Bq/m³) formations exhibited higher median indoor radon levels than siltstones, sandstones, or surficial deposits.
- Percentages of test results exceeding the EPA action level (148 Bq/m³) varied by formation type, with limestone at 55% and dolostone at 46%.
Conclusions:
- Geological bedrock significantly influences indoor radon potential in Kentucky.
- Mississippian limestones, Ordovician limestones, and Devonian black shales represent areas of highest indoor radon potential.
- The developed interactive map provides a valuable resource for radon risk assessment and mitigation efforts statewide.
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