What is Radon?
Radon is a colorless, odorless, and tasteless radioactive gas that naturally occurs from the decay of uranium in soil, rock, and water. As uranium breaks down, it converts into different elements, giving off radioactive alpha and beta particles during the process. One of the elements formed during this chain of decay is Radon gas. When these radioactive particles carried in the Radon gas are inhaled, they pose a significant health risk. The #1 leading cause of lung cancer in non-smokers is Radon exposure.
Typically, this decay, or breaking-down, of uranium happens under the soil and safely away from the air that humans are breathing. When Radon is released from the ground into the outdoor air, it is diluted and not a concern, but in enclosed spaces like homes, it can accumulate to dangerously high levels and become a risk to the health of you and your family.
When homes are built, builders must dig down below the frost line to lay the foundation in order to prevent it from heaving during the winter months. This is why homes in Alberta almost always have basements. However, now that the home is sitting below the surface grade of the earth, the foundation walls and floor slab are all surrounded by soil and possibly bedrock which may contain uranium.
Where is Radon Found Geographically?
Uranium is a common element found everywhere in the earth’s crust, and as a result Radon gas can be found almost anywhere in the world, but it is found in higher concentrations in specific regions. Canada has one of the largest shares of uranium in the world. The Athabasca Basin, for example, is home to several uranium mines and mills.
In the context of housing, Radon gas from the decay of uranium can be found anywhere. Almost all homes in Canada will have some degree of exposure to Radon but it is not uniform. It’s possible to appear at dangerously high levels on one street, or even home, and not a neighboring street or home. Luckily, there are cheap, simple, and effective ways to both test for, and mitigate, Radon gas levels in your home. We will discuss these options later in the article.
How Radon Enters Homes
Radon normally enters homes and buildings through cracks and openings in the foundation.
For several reasons, the soil around your home’s foundation has a higher pressure than the air inside the basement. The weight of the soil and moisture outside your home produces a positive pressure on air trapped within the soil as it tries to escape to the surface. Meanwhile, your home has ventilation, both helping exit stale air from your home and introduce new, fresh air. Since heat rises, there is also typically a significant temperature difference between the upstairs of your home, and the basement, (especially in 2-storey homes). This difference in temperature draws warm air upwards, creating a negative pressure in the basement.
The lower pressure in your basement compared to the surrounding soil, allows air and gasses to seep in through any cracks or other openings in your floor slab, foundation walls, or sometimes even where the wood frame meets the foundation.
What Happens Once Radon is Inside the Home?
Radon is 7.5x heavier than air. This means it will tend to accumulate in basements and crawl spaces, especially ones without adequate ventilation. If you think about your average 2-storey home, it will have 2-3 windows, near the ceiling of the basement, which are surrounded by a window well outside and rarely if ever opened.
A home with a walk-out basement for example, with a doorway and several large windows that do get opened regularly, is at less risk for accumulating Radon than a 2-storey home with a couple of small, high, windows that are almost never opened. Even in a walk-out though, during the cold winter months, Radon can accumulate inside.
Testing for Radon
There are several different ways to test for Radon in your home, but most reliable tests take a minimum of 3 months to complete. Radon can vary daily and seasonally. Factors such as temperature changes, barometric pressure, and ventilation patterns can cause Radon levels to fluctuate, making short-term test results more variable. These tests provide a snapshot in time, which may not accurately represent the average Radon exposure in your home throughout the year. For that reason, we do not recommend short-term Radon testing.
Long-term testing captures a broader range of conditions, including seasonal variations, making them more representative of the typical Radon exposure in your home. Accurate and reliable test kits can cost around $60 to purchase, and sometimes come with a lab charge of $40 or so when you submit your kit for analyzing.
Essentially, you place one or two test kits in your basement, and wait 3-6 months as instructed by the product manufacturer. Once the time has passed, you send it away to a lab to be analyzed.
There are different types of tests but the most common for long-term testing are Alpha Track Detectors. Alpha Tracks use a plastic film that records “tracks” left from the impact of alpha particles. These tracks are microscopic damage, or tiny little pits and lines, created by the energy of the alpha particles as they collide with the film. Measuring the amount of tracks compared to the amount of time it was left in the test area allows the lab to determine the average Radon levels.
Short-term tests, which we do not recommend, can take place from anywhere from a few days to a few weeks. Activated Charcoal Detectors and Electret Ion Chambers are the most common short-term tests. A device containing activated charcoal will absorb Radon gas from the air over a short period of time, typically 2-7 days. Electret Ion Chambers use a charged Teflon disk (electret) that loses charge when exposed to ionizing radiation from Radon. With either of these test instruments, you simply place it in your basement, then send it to the lab for analysis.
Whichever test you choose to perform, you are best off by conducting it during the winter months when your windows are closed and you have the least fresh air circulating in your home. This will help show you the levels at their worst, rather than giving you a false confidence that levels are fine by testing during the summer months.
Test Results and Radon Levels
Radon is measured in Becquerels per cubic meter. A Becquerel is a measurement of the rate of radioactive decay, with one becquerel representing one decay event per second.
Health Canada recommends taking action to reduce Radon levels in your home if the concentration exceeds 200 Bq/m3. The World Health Organization recommends taking action at 100 Bq/m3.
Reducing Radon Levels
The good news is that mitigating or reducing Radon levels is not unaffordable or especially difficult to achieve.
In Alberta, homes built in 2015 or later are required to have Radon mitigation systems roughed-in by law. What this means is that underneath your floor slab there is a series of perforated pipes that come together, and come up through your floor slab somewhere in your basement. When you purchase your home, this pipe will be plugged or capped and not in service. There is also a plugged or capped piece of piping that exits the sidewall of your home above the foundation level, located directly above the floor pipe. After moving in, you can complete a Radon test, and if high levels of Radon are detected, you simply install a low voltage fan, in a piece of piping that connects the floor pipe to the sidewall outlet. This fan pulls a vacuum from underneath your floor slab, dispersing the air and gas to outside where it can be diluted by the atmospheric air. Since there is now a negative pressure under and around your basement, Radon gas will not enter your home but rather, air from your home would escape outward into the ground from any cracks in your foundation.
If your home was built before 2015, you can still install this system fairly easily. The only difference is that some of your concrete floor slab will need to be cut out and then replaced after the installation of the perforated piping. The cost of this work depends heavily on the size of your home, whether your basement is finished or not, and other unique qualities like if you have heated floors for example. Typically the cost to install a Radon mitigation system is around $2500-4000 if you have an unfinished basement. If you will need to refinish floors etc, you can add on costs from there.
Other simple and effective ways to reduce Radon levels are to increase ventilation, or seal any foundation and floor slab cracks. Opening windows, and recirculating your furnace, will help change out the stale, heavy air in the basement with fresh clean air.
Radon in Water
Radon can also be present in water, particularly in well water. If Radon is detected in your water supply, treatment options include:
Professional Help
There is a program called the Canadian National Radon Proficiency Program (C-NRPP) that is managed by the Canadian Association of Radon Scientists and Technologists (CARST), which certifies Radon professionals in Canada.
If you would like testing, or Radon mitigation work completed for you, C-NRPP has a “Find A Professional” feature on their website: www.c-nrpp.ca. Alternatively, you can ask your Realtor for a referral to a reliable Radon technician.
Resources and Support
Unfortunately, there are no specific programs in Alberta that directly subsidize the cost of Radon testing or mitigation for homeowners. However, there are resources and initiatives that can help homeowners understand and manage Radon risks, as well as potential rebates or incentives from other organizations. Here are some options to explore:
- Alberta Health Services (AHS): Alberta Health Services provides information and resources about Radon, its health risks, and guidance on testing and mitigation. While they do not offer financial assistance, they can help you understand the importance of addressing Radon in your home. www.albertahealthservices.ca.
- Lung Association, Alberta & NWT: The Lung Association works to raise awareness about Radon and offers resources for testing and mitigation. www.ablung.ca.
- Health Canada: Health Canada provides information on Radon, including testing and mitigation guidelines. www.canada.ca/en/health-canada/services/health-risks-safety/radiation/radon.html.
- Canadian National Radon Proficiency Program: The C-NRPP can help you find Radon measurement and mitigation professionals who may offer competitive rates or financing options. www.c-nrpp.ca.
Conclusion
Radon is a serious health risk that can be easily and affordably managed with proper testing and mitigation. There is no way to know which homes may have high Radon levels without long-term testing. Although scientists and medical professionals are now aware of Radon and its harsh effects on people, such as lung cancer, very few homeowners, or people in general, are aware of Radon or its risks. This means if you are purchasing a home, you should test it after you move-in. Testing and taking action to reduce high Radon levels can help protect you and your family from the harmful effects of Radon exposure.