Radon Testing

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What is radon?

Radon is a colorless, odorless radioactive gas that’s produced by decaying uranium. It’s present in nearly all soils, and very low levels of radon are found in the air we breathe every day, according to the American Cancer Society.

The problem occurs when radon gas enters your home and gets trapped. Long-term exposure to high levels of radon can cause lung cancer. The Environmental Protection Agency (EPA) estimates that lung cancer caused by radon exposure kills about 21,000 Americans every year. (This may be how this woman got lung cancer at 31-years-old—without ever smoking a cigarette.)

The radon gas moves from the soil into a home. Although it can seep directly through pores in concrete, the worst entry points are gaps in walls and floors (see picture above). Any house, of any age, in any state, can have elevated radon levels, the EPA warns. It really depends on the way your specific house interacts with the surrounding soil. Your neighbor’s radon level may differ substantially from yours. Radon poisoning is just one of the ways your house may be making you sick.

Testing your home from radon is the only way to know whether your house is safe, according to Family Handyman magazine, a sister publication of The Healthy.

Conduct the test in the lowest livable area of your house that is regularly used 8 to 10 hours per week.

• Short-term tests: These are useful to see if further testing is warranted. Most are activated charcoal-based or use electret ion methodology; both measure radon levels for two to seven days. You mail the tests to a lab for the results. Short-term tests are available at home centers, hardware stores, and online retailers.
• Long-term radon tests: These radon tests measure levels for 90 days to one year. Most are based on alpha particle tracking. This is a more accurate indicator of average annual levels, which can vary significantly from day to day and month to month based on factors such as a drop in air pressure, gusty winds, variable soil moisture, and snow cover, which traps radon gases. Long-term radon tests are available through state radon agencies and online retailers.
• Continuous radon tests: Electric monitors plug into a standard outlet. These can be used for both short-term and long-term testing to give you a running average every day.
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If an initial short-term test registers 4 picoCuries per liter (pCi/L) or higher, the EPA recommends doing a second radon test. A long-term test will give you the most accurate information, but a short-term test is acceptable if you need the results quickly, such as for a real estate transaction, or your first levels registered 8 pCi/L or higher. If a second test registers above 4 pCi/L, consider taking steps to reduce radon levels in your home, the EPA cautions.

You can start by trying these easy repairs to reduce radon levels. These efforts alone rarely reduce levels significantly, but if your level is only slightly elevated, these repairs might make the difference. They will also make other radon reduction methods more effective and cost-efficient. 

• Caulk foundation cracks, construction joints, and other openings with polyurethane caulk.
• If you have a sump pump, install an airtight cover on it (choose one that allows access to your sump).
• Cover soil in crawl spaces with polyurethane plastic sheeting (with a minimum thickness of 6 mil, available at home centers) tightly attached to the walls.
• You can also try sealing concrete, although the EPA has found concrete sealers to be a temporary solution at best.

Once you’ve tackled these, retest. If levels are still high, consider installing a radon mitigation system yourself or hire a pro.

This article has been adapted from Family Handyman magazine, a sister publication of The Healthy.