Toenails as A “memory” of Radon Exposure? Yes.
It may sound like science-fiction but it’s actually science-reality. University of Calgary scientists, working within the research initiative Evict Radon National Study, have launched a Canada-wide study exploring whether toenail clippings can act as a long-term biomarker of radon exposure. Early research suggests measuring the radon decay product lead-210 (²¹⁰Pb) in slow-growing tissues like toenails could reflect years of exposure – an angle traditional radon tests can’t capture on their own. Many of us have not tested historically the radon levels in each residence or occupation we’ve spent our time in and this study looks to capture that previously missing puzzle piece.
RadonCare Happy To Support Research Partner
RadonCare is proud to support Evict Radon’s evidence-driven work to better understand and reduce Canadians’ radon risk. As research partners, we’re committed to spreading factual science-based radon awareness from testing through to mitigation and all the steps in between. We’re happy to support data collection to further these studies (opt-in only basis) and to answer questions where possible.
Learn more about Evict Radon’s toenail study and participation requirements.
What Does This Mean For You?
- Testing is still step one. Health Canada recommends long-term radon testing and taking action if the annual average exceeds 200 Bq/m³. Toenail biomarkers may help estimate historical exposure, but they don’t replace home testing used to make mitigation decisions.
- You have testing options. Digital monitors + alpha-track tests. Canada’s program recognizes both passive and electronic approaches (with device performance overseen/listed by C-NRPP). Choose reliable, C-NRPP-listed options and measure for at least 91–120 days.
Learn about digital monitor testing here: Digital Radon Monitors Home Testing - Mitigation works. If your result is over 200 Bq/m³, reducing levels as low as reasonably achievable (ALARA principle) is recommended ideally within one year if over ~600 Bq/m³.
For information on mitigation click here: Mitigation.
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What’s being studied?
Whether trace ²¹⁰Pb in toenails can indicate someone’s long-term radon exposure and contribute to lung-cancer risk research. Check out the study here.
Who’s running it? University of Calgary researchers with the Evict Radon National Study: a large, multi-year Canadian research collaboration, the largest radon research group worldwide (and they’re even nice!).
How can people help? Eligible participants complete a long-term home radon test, answer a few surveys, and mail toenail clippings over ~120 days. The goal: is simple, robust radon (see the alliteration I did there?) data from up to 10,000 Canadians.
Why Does It Matter If I’ve Tested Already?
Radon exposure is the second leading cause of lung cancer. Combining accurate current testing with historical exposure indicators (like toenails) could sharpen screening and prevention strategies so Canadians at greatest risk are identified and protected sooner. If radon related lung cancer hasn’t fortunately affected you, it could affect a loved one, a friend or a neighbour. This important research helps us to reduce this risk.
Learn More About Radon-Related Cancer Here.
FAQ
What level of radon requires action in Canada?
Health Canada recommends action at ≥200 Bq/m³ (annual average), with faster timelines the higher the level.
Do Toenail Results Replace A Home Test Kit?
No. Toenail analysis is a research biomarker of long-term exposure; home testing remains the standard for deciding on mitigation.
Can I test with a Digital Monitor?
Yes. Health Canada recognizes passive and electronic detectors. Make sure your test device is approved. More information available on our blog, and through C-NRPP.