Radon is a naturally occurring radioactive gas that can accumulate in homes and buildings, posing a significant health risk to residents. Because it is colorless, odorless, and tasteless, it is impossible to detect without specialized equipment. Testing your home is the only way to determine if you and your family are at risk of exposure.
According to health organizations like the EPA, radon is the second leading cause of lung cancer worldwide. Fortunately, radon detection is a straightforward process that any homeowner can perform. This guide will walk you through the types of tests available, how to use them, and what to do once you receive your results.
Understanding Radon and Its Risks
Radon is produced by the natural breakdown of uranium in soil, rock, and water. As this gas is released from the earth, it can enter buildings through cracks in the foundation, gaps in service pipes, or construction joints. Once inside, it can become trapped, leading to high concentrations over time.
The health risks associated with radon come from breathing in its radioactive particles. Over long periods, exposure to high levels of radon can damage the cells lining the lungs. Because you cannot see or smell it, many people live in homes with high radon levels for years without realizing it.
When Should You Test for Radon?
Experts recommend that every home be tested for radon, regardless of its age, location, or construction type. Even if your neighbor’s home has low levels, your home could still have high concentrations due to local soil variations and foundation integrity.
Specific times when you should prioritize radon detection include:
- When buying a new home: Radon testing is a standard part of many home inspections.
- After major renovations: Changes to the structure or ventilation can affect radon levels.
- After installing a mitigation system: To ensure the system is working correctly.
- Every two years: Regular testing ensures that shifting soil or new cracks haven’t changed the environment.
Types of Radon Detection Devices
There are two primary categories of radon tests: short-term and long-term. Choosing the right one depends on your timeline and how much detail you need regarding your home’s air quality.
Short-Term Radon Tests
Short-term tests remain in your home for two to 90 days. These are the most common types of tests and are ideal for quick screenings, such as during a real estate transaction. Because radon levels can fluctuate daily based on weather and pressure, short-term tests provide a snapshot of current levels.
Common short-term devices include charcoal canisters, alpha track detectors, and liquid scintillation vials. These devices are placed in the home and then sent to a laboratory for analysis.
Long-Term Radon Tests
Long-term tests remain in your home for more than 90 days, often up to a full year. These tests provide a more accurate picture of your average annual radon exposure because they account for seasonal changes in gas levels.
If your initial short-term test shows levels near the action limit, a long-term test is often the next step to confirm if permanent mitigation is necessary.
Continuous Radon Monitors
Digital or continuous radon monitors are electronic devices that provide real-time readings. These are more expensive than one-time kits but offer the benefit of showing how radon levels change hour by hour. Some smart home versions can sync with your smartphone to provide alerts.
How to Perform a Radon Test
Performing a radon test is a simple process that does not require professional help in most cases. Most hardware stores sell DIY kits that include everything you need.
Step 1: Choose the testing location. Place the detector in the lowest lived-in level of your home, such as a basement that is used frequently or a ground-floor living room. Avoid kitchens, bathrooms, or laundry rooms, as high humidity and fans can interfere with the results.
Step 2: Follow “closed-house” conditions. For short-term tests, keep windows and outside doors closed for at least 12 hours before and during the test. You can still enter and exit the home normally, but do not leave doors or windows propped open.
Step 3: Place the device correctly. Set the detector at least 20 inches above the floor and away from drafts, exterior walls, and direct sunlight. It should be placed in an area where the air is still but not completely confined, like a table or shelf.
Step 4: Record the start and end times. Most kits require you to write down exactly when you opened the package and when you sealed it. Accuracy is vital for the lab to calculate the concentration correctly.
Step 5: Send the kit to the lab. Once the testing period is over, seal the device immediately and mail it to the laboratory listed in the instructions. You will typically receive your results via email or mail within a few weeks.
Understanding Your Radon Results
Radon levels are measured in picocuries per liter of air (pCi/L). In the United States, the EPA has established an “action level” of 4.0 pCi/L. Here is what your numbers mean:
- 0.0 to 2.0 pCi/L: These are considered low levels. While no level of radiation is entirely safe, most experts agree that levels in this range do not require immediate action.
- 2.0 to 4.0 pCi/L: The EPA suggests considering mitigation if your levels fall in this range. You may want to conduct a long-term test to see if the average remains this high.
- 4.0 pCi/L or higher: You should take action to reduce the radon levels in your home. At this level, the risk of lung cancer increases significantly.
What to Do if Radon Levels Are High
If your test results indicate high radon levels, do not panic. Radon problems can be fixed, and the methods are well-established. This process is known as radon mitigation.
The most common mitigation method is a sub-slab depressurization system. A professional contractor installs a pipe through the basement floor or foundation and uses a specialized fan to vent the radon gas from beneath the house to the outside air. Other methods include sealing cracks in the foundation and improving the home’s ventilation systems.
It is highly recommended to hire a certified radon mitigation professional to ensure the system is installed safely and effectively. Once the system is running, you should re-test your home to confirm that the levels have dropped below the action threshold.
Common Mistakes in Radon Detection
To ensure your results are accurate, avoid these common errors during the testing process:
- Moving the device: Do not move the detector once the test has started.
- Testing during storms: High winds and heavy rain can cause temporary spikes in radon; try to test during a period of stable weather.
- Interfering with the device: Do not place fans near the detector or cover it with objects.
- Ignoring instructions: Each kit has specific requirements for sealing and shipping. Read the manual thoroughly before starting.
Conclusion
Radon detection is a vital step in maintaining a healthy and safe home environment. Because this gas is invisible and odorless, testing is the only way to protect yourself from the long-term risks of exposure. Whether you choose a quick short-term kit or a comprehensive long-term monitor, the information you gain is invaluable for your peace of mind.
By following the proper testing procedures and taking action if levels are high, you can effectively manage the radon in your home. For more tips on maintaining a safe living space, explore our other articles on home air quality, foundation maintenance, and DIY home safety inspections.