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tion,” at a time when the house is closed to outside air, during the winter, for example. The test kit should be placed in the area closest to the ground, where the concentration of radon will be highest. A good place, he said, would be in the basement, or in the crawlspace between the floor and the ground. If the crawlspace is normally closed during the winter, it should be closed up during the testing period.
If the charcoal test reveals a level above the recommended maximum, the agencies recommend a second test with the more accurate, and more expensive, alpha track indicator. This kit is exposed over a period of months to give a reading on the radon level over time.
Dr. Einarson suggested that this test be done in the main living space
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