They are fairly simple to use and are readily available at hardware and department stores. When the test is completed, users mail their air samples to the manufacturer for analysis. One popular commercially available test relies on a charcoal canister, which provides results following a two to seven-day period of evaluation. Other tests can last for months. However, depending on where you are located, radon testing may only be legal by a home owner for use in his or her own home.
Many states certify professionals to perform radon sampling.
Since this is an important test, especially in areas known to contain high radon levels, prudence might suggest allowing a professional to undertake this work. The American Lung Associations suggests that all homes be tested below the third floor for the presence of radon. It also urges that testing be done in the nation's schools. Since radon levels can vary by season, long term testing might provide the most accurate information. Short term tests might miss seasonal fluctuations, and thus might be less reliable.