Provides certification and continuing education classes that meet National Radon Proficiency Program. Located in Colorado Springs, CO.

Short primer on U238 decay through radon to stable lead, radioactive half times of elements. Chart of the decay chain with half times and alpha or beta radiation.

U.S. Geological Survey site on radon in earth, air and water. Site resources include educational information on radon, and multiple maps on the geologic and geographic occurrence of radon in the United States.

Comprehensive article on radon. Radon progeny, the decay chain and radiation. Lung cancer risks. Occupational and residential limits. Geographic radon potential. Waterborne radon. (June 1999)

Provides radon reduction services and products for both airborne and waterborne radon, consulting, design and installation services, detectors. Located in Connecticut, markets nationwide.

Radon mitigation contractors of residential and commercial properties in Florida. US EPA Listed, NEHA Certified, Florida State Certified. Information on radon and mitigation methods, related links.

Supplies for existing homes,commercial buildings and new construction featuring the KTA-150 low voltage system and Soil Gas Collector Mat.

Designs and installs radon mitigation systems in homes, schools and apartment complexes in Virginia, Maryland and Washington, D.C.

Informative article about how radon forms and why it is so dangerous. Comparison of radon test devices. Useful links.

A chart listing all of the decay products of radon gas in their order of appearance. Atomic mass, atomic numbers and the energy in MeV of the released alpha radiation.