• Radon in fault and shear zones, eastern United States

• Radon in glacial deposits of the Upper Midwest

• County radon potential assessments in the Washington, D.C., area

• Terrestrial gamma radioactivity of the conterminous United States

• Radon in ground water and soil gas on Indian reservations in Wisconsin

• Radon in ground water of the Lower Susquehanna and Potomac River Basins

• USGS Geologic Information

Other Sources of Radon Information

Note: the following web sites are not operated by USGS.

• The High Radon Project-Lawrence Berkeley National Laboratory

• Radon information from the U.S. EPA (including the National Radon Proficiency Listing)

• National Safety Council Radon Information Page

• "Radon Occurrence and Health Risk" by R. William Field, Ph.D., Department of Epidemiology, University of Iowa Hospitals and Clinics