Radon Exposure Calculator

How Testing Works Order a Radon Test Kit How To Interpret My Results Radon Mitigation

What dose of radiation are you getting from radon?

Using the latest science, the International Commission for Radiological Protection (ICRP) has developed a conversion formula to estimate the amount of alpha particle radiation being absorbed by your lungs from radon. To calculate this, two numbers are needed:

A long-term household radon level in Bq/m³ or pCi/L
The number of hours a person spends per year breathing air in that property. This “activity pattern” is unique to a specific person depending on their lifestyle, and may not be the same for everyone living, learning or working under the same roof.

This calculator will allow you to estimate your absorbed radiation exposure based on these numbers, as an annual rate and total dose, based on the amount of time you have lived in that property.

Dosimeter (EN)

"*" indicates required fields

How many different houses do you consider ‘home’ (meaning somewhere you live and sleep for sustained periods of time) during a typical year?*

One house

I split my time between 2 or more houses

Months of year in the primary home*

Please enter a number from 1 to 12.

Is your time spent at home different during the days where you are working (or in school), versus the days where you are not (e.g. weekends or holidays)?*

Yes

*In a typical year

What is the tested Radon in your primary residence?

Unit of Measure in your Report*

Becquerels per cubic meter (Bq/m³)

PicoCuries per litre (pCi/L)

Radon level in your primary home*

Please enter a number from 0 to 25000.

Radon level in your other home*

Please enter a number from 0 to 25000.

Number of hours spent in the house on a typical 24 hour day

Workday (in hours)*

Please enter a number from 0 to 24.

Note: If you work in a hybrid manner (both at home and in another building) just average the number of hours per day that you are at home.

Non-workday (in hours)*

Please enter a number from 0 to 24.

Hours in home (in hours)*

Please enter a number from 0 to 24.

Number of years spent in your current home(s)

Years in home*

Please enter a number from 1 to 99.

Years in Home B*

Please enter a number from 1 to 99.

Weeks spent NOT in home(s), e.g. on vacation, away for business, during a typical year.

Number of weeks spent NOT in home(s)*

Please enter a number from 0 to 52.

If you wish to provide us any feedback on this calculator, please comment here:

For questions related to the study or other radon questions, please email [email protected]

Radon and your health

Radon is a radioactive, naturally occurring gas, and a leading cause of lung cancer.

The overall relative risk of lung cancer increases by 16% for every 100 Bq/m3. This is based on over 10,000 lung cancer patients and controls, who had their homes tested for radon using long-term testing devices, across North America, Europe and China.

Testing for radon is simple and cheap. A reliable radon test is:

Health Canada recommended LONG-TERM (90+ days) radon testing device, such as our at-cost radon test kit.
Used long term, to get reliable results you need to test for radon for at least 91 days.
Placed in an area that will measure the air you breathe most regularly. This is important as this will have the greatest impact on your health. Click here to learn more about where to test.

Health Canada’s maximum tolerated exposure limit for radon is 200 Bq/m3, but increased lifetime cancer risks are evident at anything at or above 100 Bq/m3. The best advice is to have radon levels that follow the ALARA principle (As Low As Reasonably Achievable). We have a detailed page on how to interpret your radon levels here.

Radon is an odourless, colourless and tasteless gas and there are no immediate symptoms of radon gas exposure that a person will notice. Although there are no symptoms from radon exposure, the radiation released by radon (alpha particles) will immediately damage the DNA of the cells lining the lungs. This damage increases your lifetime relative risk of the only scientifically verified health effects of radon exposure: lung cancer. The only way to know you have radon in your home is to use a Health Canada-recommended long-term testing device.

Yes. Combined tobacco use and high radon dramatically increase your lung cancer risks than either alone. Health Canada has some information on this here. If you are exposed to or use tobacco products, testing your home for radon (and mitigating it if high) is one way of lowering your chance of getting lung cancer.

It is important to note that there are other verified causes of lung cancer that when combined with radon exposure, will dramatically increase your lifetime relative risk of getting lung cancer. These are:

Exposure to air pollution such as forest fire smoke and combustion particulates (called particulate matter less than 2.5 microns aka PM 2.5)
Exposure to heavy metals such as Arsenic
Exposure to Asbestos
Previous history of severe lung inflammation (such as pneumonia and tuberculosis)

Radon and where you live

Yes! Unfortunately, Canada has some of the highest radon levels globally and no place in Canada is free from radon. Learn more about radon in Canada here.

ALL of Canada has the potential for high radon (there is no radon “free” area). The biggest influencing factor on high radon is how your home is built and used. The only way to know for sure is to test.

Radon and your home

Radon mitigation is the process of preventing a home from pulling soil gases into the living space. This usually consists of an active fan pulling soil gases from under the foundation of a home and venting it outside. When properly installed, these systems are extremely effective at lowering radon in a home. We have detailed information on a blog and a dedicated page on our website.

No, all homes have some method of air mixing and heating effects that mixes air nearly evenly across the home. Based on our peer-reviewed and published research, basements are only 13% higher than the main and upper floors. This means that if your basement is high in radon, so too are your main and upper floors.

Through our research, we see that ALL homes have the potential to be high in radon. But, our research shows that newer homes have an increased chance of having high radon. Whereas 1 in 9 homes built before 1940 are above Health Canada’s limit of 200 Bq/m3, a home built after 2001 has doubled this risk to 1 in 4.5 homes above 200 Bq/m3.

Not necessarily. If your home was built after 2010 – 2015 (depending on your province/territory) there will be a “radon rough-in”. This is the beginning of a radon mitigation system but is non-functional. This requires a certified professional to install an active fan and complete the installation of a full mitigation system.

The Evict Radon National Study

There are a few reasons:

We offer an at-cost kit and take no profits whatsoever, from radon testing or mitigation.
We use the only internationally certified (ISO 17025) radon tester and constantly perform quality controls to ensure the radon reading you get is reliable.
Your anonymous, de-identified radon test will be used in scientific research by Canadian scientists to solve Canada’s large and worsening radon problem to:
- Promote informed changes to building practices
- Promote policy changes to address those who are affected the most by radon exposure
- Inform all Canadians about radon and its health effects

The Evict Radon National Study is a Canadian public-sector, university-based cancer prevention study. Our team consists of researchers and other scientists based at universities and agencies from coast to coast, including BC Cancer Agency (BC), Simon Fraser University (BC), University of Calgary (AB), University of Saskatchewan (SK), University of Ottawa (ON), Université Laval (QC), Dalhousie University (NS), Canadian Nuclear Laboratories (ON), the National Research Council (of Canada), and Health Canada.