Radon gas concentrations can be measured with a simple monitoring device. Two types of radon testing devices are commonly used and can be purchased through the mail, in some hardware stores or in other retail outlets. Both types of detectors are inexpensive, easy to use and can be used only once.
A short-term detector is left in place for two to ninety days. This type of detector is useful for a quick screen of the radon level, which can indicate the potential for a problem and the need for additional testing. Follow the directions that come with the detector for accurate use. A short-term detector should be placed in the lowest livable level of the house, preferably during the winter months.
A long-term detector is left in place for three months to one year. This provides a long-term average of radon levels which may vary at different times of the year. Long-term detectors are generally placed in the main living areas of the house.
Reference: Radon Facts, Pm 1336, Iowa State University Extension
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