How to Fool a Radon Detector

Updated May 10, 2017

Radon is a gas that naturally occurs in some areas. Radon is suspected to be a major cause of lung cancer. When selling a home, buyers often perform a short-term radon test before signing the final contract. These tests are fairly inaccurate, and depending on the time of year, may cause a false positive result in a house that has an acceptable level of radon. It's possible to "fool" a radon detector during the winter months or rainy season, when a false positive result is likely.

Open the windows. If your basement windows are often closed, especially during wet or freezing weather, open them up before the detector is placed in your basement, if possible. This will allow some of the gas to escape.

Open the door leading from the basement to the main living area of your house. During cold and rainy weather, when the basement may be cooler than the rest of the house, radon gas can get trapped in the lowest level of your home. Opening the basement door can help some of it to rise and escape.

Request a retest if the results come back high. After a heavy rainfall or when the ground is frozen, less radon can seep out of the basement. Waiting a couple of weeks for the ground to thaw or dry can mean the difference between an acceptable test result and an unacceptably high test result.


Invest in a long-term radon monitor if the short-term results come back abnormally high. These monitors are relatively low in cost and can give you a day-to-day reading of the amount of radon in your home. The amount of radon during a cold or wet two-week period is not as important as the amount of radon in the home throughout the course of a 6- to 12-month period.


It is illegal to tamper with a radon detector during the test period in some states.

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About the Author

Michelle Kulas worked in the health-care field for 10 years, serving as a certified nurses' assistant, dental assistant and dental insurance billing coordinator. Her areas of expertise include health and dental topics, parenting, nutrition, homeschooling and travel.