Since you can't see or smell radon and radon levels can be different (even with similiar homes in your neighborhood), the ONLY way to determine if you have a radon problem in your home is by testing. Testing can be done by a professional, or you can do testing yourself.
The fastest method for radon testing is using one of several short-term tests. Short-term tests stay in the home for two to ninety days and are known as "charcoal canisters," "alpha track detectors," "continuous monitors," and "electret ion chambers." Short-term tests will be less likely to reveal year-round exposures. Nevertheless, for quick results (such as in a real estate transaction) the U.S. Environmental Protection Agency (EPA) recommends one short-term test followed by a second short-term test (sequential test), or two tests taken at the same time (simultaneous test). The average between the two results can help decide whether or not the homeowner should have radon mitigation.
Long term testing is very accurate in predicting year-round levels of radon in the home. These tests stay in the home for periods longer than ninety days. The detectors commonly used for long term testing are known as "alpha track" and "electret" detectors.
For do-it-yourself testing, "charcoal canisters" and "alpha track detectors" are widely available to the public (home improvement centers, health department and some Extension offices); however, it is important to make sure that the detector meets the EPA radon proficiency standards and that the detector will not expire during the testing period. If self-testing is not desirable, a radon measurement professional can be hired (check your phone directory).
The EPA set a recommended action level for remediation of radon at 4.0 picoCuries/liter (pCi/L) or above.
Contact your local Extension office or state health and/or environmental agencies for more specific information on radon testing requirements and sources in your area. See the eXtension web site to find Local Extension offices near you.
For additional information on radon check out this Environmental Protection Agency web site.
REGIONAL NOTE:
Due to the characteristics of the karst geology found in Tennessee, Kentucky and northern Alabama, the U.S. EPA recommends a year-long radon test, as the short-term tests are not reliable.
