How to Test Your Home
Radon Detectors – This photograph shows two types of inexpensive indoor radon level detectors. The short-term detector (a) uses activated charcoal to absorb radon from the air and is typically used for tests lasting between 2 and 7 days. The long-term alpha-track detector (b) consists of a piece of special plastic inside a container. It is typically used for tests of 91 days or more. The detectors are sent to certified laboratories for analysis when the collection time has expired.
There are Two General Ways to Test for Radon:
The quickest way to test is with short-term tests. Short-term tests remain in your home for two days to 90 days, depending on the device. “Charcoal canisters,” “alpha track,” “electret ion chamber,” “continuous monitors,” and “charcoal liquid scintillation” detectors are most commonly used for short-term testing. Because radon levels tend to vary from day to day and season to season, a short-term test is less likely than a long-term test to tell you your year-round average radon level.
Long-term tests remain in your home for more than 90 days. “Alpha track” and “electret” detectors are commonly used for this type of testing. A long-term test will give you a reading that is more likely to tell you your home’s year-round average radon level than a short-term test.
EPA Recommends the Following Testing Steps:
Step 1. Take a short-term test. If your result is 4 pCi/L or higher take a follow-up test (Step 2) to be sure.
Step 2. Follow up with either a long-term test or a second short-term test:
For a better understanding of your year-round average radon level, take a long-term test. If you need results quickly, take a second short-term test. The higher your initial short-term test result, the more certain you can be that you should take a short-term rather than a long-term follow up test. If your first short-term test result is more than twice EPA’s 4 pCi/L action level, you should take a second short-term test immediately.
Step 3. If you followed up with a long-term test:
Fix your home if your long-term test result is 4 pCi/L or more. If you followed up with a second short-term test: The higher your short-term results, the more certain you can be that you should fix your home. Consider fixing your home if the average of your first and second test is 4 pCi/L or higher.