Guidelines for Your First Radon Detector Test

(Called a Radon Screening Test)

There Are 2 Steps To Testing Using Radon Detectors

Radon testing is usually done in 2 steps or phases. The first step is called a radon screening test and the second step is called a follow-up test. A screening test is designed to tell you if your home has the potential for a radon problem.

The Longer the Test the Better the Test
In general, the longer you expose your radon detectors the better your radon detector test results will be. This is because radon levels can vary from day-to-day and season-to-season. So if time permits, we recommend doing your radon detector screening test for 90 days using the Model AT-100 alpha track radon detectors. If you need your radon detector results sooner, or you have reason to believe you may have very high radon levels, then you should use our 2 day Model ST-100 radon detector kits. Of course you can get the best of both worlds by using both types of radon detectors at the same time.

Keep Doors and Windows Closed During the Radon Detector Test
When doing a screening test using a 2 day short term radon detector, it's important to control or stabilize the test conditions as best as possible by keeping all doors and windows closed during the test period. We call this closed-house test conditions. Normal entry and exit is OK, but you should postpone your radon detector screening test if you are planning any activities where the doors and windows will be open more than normal. If using a long term radon detector (Model AT-100 alpha track radon detector), closed-house test conditions are not necessary.

Put Radon Detectors in Rooms That Contact the Ground
As a minimum you should always radon detector test the footprint of your house. The footprint is the place or places where your home contacts the ground. For example, if you have a basement family room you should place radon detectors there. If you have a basement and a crawlspace you need to put radon detectors in the basement and in the room above your crawlspace. Never test in a crawlspace.

You should only put radon detectors in livable areas of your home. Do not put radon detectors in garages, dirt floor basements, root cellars, crawlspaces or the like. An example of a livable area might be a bedroom or a playroom. Also an unfinished basement would be considered "livable" if children could play down there.

Also Place Radon Detectors in Rooms Where You Spend the Most Time
Most people don't spend all of their time in the lower levels of their home. So in addition to radon detector testing your house's footprint, you should also put radon detectors in other key living areas of your home. These "key living area" tests are called profile measurement because they help give you a better idea of your radon exposure based on the way you live in your home. For instance, you may only spend an hour or two a day in your basement family room, but you might spend 7 or 8 hours a day in your second floor bedroom.

Your HomeRadonTest.Com radon detector kits come with complete placement instructions. But in general, radon detectors should be placed towards an inside wall, out of direct sunlight and away from drafts cased by doors, windows and HVAC ducts. The radon detectors should be placed on a table or shelf between knee and shoulder height.

Does Your Water Come From a Well?
If your home's water comes from either a private or a public well you should consider testing that water for radon. Use the WT-100 water radon detector kit to send us a water sample for analysis.

To get more help choosing the right radon test kits for your home use our Radon Testing Wizard . Or if you know which test you need you can go directly to the order page.

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