How to Choose a Radon Test Kit in BC: BC Lung vs. Airthings vs. RDCK Library Kits

Last updated: 2026-05-03

If you've already decided to test your Kootenay home for radon and just want to know which kit to buy, the short answer is the BC Lung Foundation long-term alpha-track kit — about $40, lab fees included, recommended by Health Canada. Order it, deploy it for at least 91 days during heating season, mail it back. Done.

The longer answer covers when one of the other two options actually fits better — a digital monitor like the Airthings Corentium Home, or a free short-term kit through the RDCK / public library system. There's a good reason each one exists, and a much narrower window than the marketing suggests.

This article is the buying-decision deep-dive that supports the broader radon pillar. For the testing protocol — when, where, and how long to leave the kit out — see the companion article on testing your Kootenay home for radon.

The three options, side by side

1. BC Lung Foundation long-term alpha-track kit (~$40)

The kit ships as a small Radtrak3 alpha-track detector — a sealed disc containing radiation-sensitive film. Alpha particles from radon decay leave microscopic tracks that the lab counts under a microscope after you mail it back. Health Canada, BCCDC, and BC Lung all recommend this style of detector for residential testing. It is the cheapest accurate test you can buy in Canada.

What you actually get: order online from bclung.ca, the kit arrives in a few days, you leave it sitting in your lowest occupied level for a minimum of 91 days (12 months is better), seal it in the prepaid envelope, and drop it in the mail. Results come by email in four to six weeks.

This is the kit for almost every first-time tester. It is what we'd hand a friend. The accuracy is good enough that Health Canada uses results from the same detector class to set national policy.

2. Airthings Corentium Home (~$200) or Airthings Wave Plus (~$300)

A continuous electronic radon monitor. The Corentium Home is a battery-powered handheld with a small LCD; the Wave Plus is a wall-mounted disc that connects to your phone over Bluetooth and streams readings to an app. Both update daily and produce rolling long-term averages over weeks and months.

What it's actually good for: you want to watch radon over time. Useful cases —

• Confirming a mitigation system is working. After a sub-slab depressurization install, a digital monitor shows the drop within 24–48 hours. You don't have to wait three months for a lab report to know your fan is doing its job.
• Watching the seasonal swing. A single 91-day winter test gives you one number. A monitor running year-round shows you how that number moves with weather, ventilation, and habits.
• Repeat-testing a marginal home. If your alpha-track came back at 180 Bq/m³ — borderline — a monitor running a second winter is cheaper than buying another kit each year.
• Logging a rental, suite, or commercial space. The Wave Plus exports its history; you can pull a CSV showing exactly what conditions tenants or staff were exposed to, with timestamps.

What it's not good for: a one-time decision on whether to mitigate. For that, a $40 alpha-track is more accurate than a $300 monitor and the lab analysis is independent third-party data. A consumer monitor is excellent for ongoing visibility, overkill for a single yes-or-no question.

The Ecosense RadonEye is a similar product at roughly the same price point. Same general guidance applies.

3. RDCK / public library short-term kits

Historically, the West Kootenay region had a free or low-cost short-term radon kit program run through public library partnerships, championed for years by the Donna Schmidt Memorial Lung Cancer Prevention Society. The kits were charcoal canister or short-term electret detectors — a 2-to-7-day deployment, mailed back for analysis. Lower accuracy than a long-term test, but free.

The current status of this program is unverified as of mid-2025. The Donna Schmidt Society dissolved in July 2025, and we have not been able to confirm whether the library kit program continues, who is administering it now, or which branches have stock. Before you drive to a library on the assumption a kit will be there, call ahead. Two phone numbers worth trying:

• RDCK Building Department, Nelson office: 250-352-8161
• Your local library branch directly — Nelson Public Library, Castlegar, Trail, Salmo, Slocan, Kaslo, Creston

If a free kit is currently available in your community, it's a reasonable starting point — but understand the trade-off. A 2-to-7-day reading captures one short window of weather and ventilation. Health Canada explicitly warns that short-term tests should not be the sole basis for a mitigation decision. If a free short-term kit comes back elevated, the next step is a long-term BC Lung kit to confirm. If it comes back low, you still want a long-term test before declaring the house safe.

A free kit is a useful screening tool. It is not a substitute for the $40 long-term test most homeowners should do anyway.

Decision framework

Three questions, three answers.

Have you never tested? Buy the $40 BC Lung Foundation kit. Most accurate, lowest cost, recommended by Health Canada. This is the right choice for roughly 90% of Kootenay homeowners.

Do you want ongoing visibility, or are you testing post-mitigation? Buy a digital monitor — Airthings Corentium Home ($200) or Wave Plus ($300). The reusability pays off across multiple winters and confirms mitigation systems are working in real time.

Are you testing a rental property, secondary suite, or commercial space where logging matters? Digital monitor with app-based history. The CSV export is the documentation a landlord or employer needs if the question ever comes up.

A free library short-term kit, if available, is a reasonable preliminary screen — but it does not replace a long-term test. Use it as a triage tool, not a final answer.

Kootenay-specific context

A few things worth knowing before you deploy any of these kits:

• Test October through April. Closed-window heating season is when the stack effect pulls the most soil gas in. A summer test under-reports. The pillar page and the testing protocol article cover the timing rule in more depth.
• Place the detector on your lowest occupied level. In most Kootenay homes that means a basement bedroom, a basement rec room, or a finished walkout suite. Not an unfinished mechanical room you only enter to change a furnace filter.
• Roughly half a metre off the floor, away from drafts and direct sunlight. Not in a bathroom, not on top of a heat register.
• The local risk picture is real. Voluntary test-kit challenges show Castlegar around 59%, Kimberley 49–59%, and Nelson roughly 25% of tested homes above Health Canada's 200 Bq/m³ action level. Even adjusting for self-selection bias, the regional pattern holds. The BC Interior is one of three Health Canada-named radon hotspots for a reason.

What to do with the result

A long-term alpha-track returns a single number in becquerels per cubic metre (Bq/m³). Health Canada's guidance is straightforward:

• Below 200 Bq/m³ — no action required. Re-test every five to ten years and after any major retrofit.
• 200–600 Bq/m³ — Health Canada recommends mitigation within two years.
• Above 600 Bq/m³ — mitigation recommended within one year.

If your number is elevated, the pillar page covers what mitigation actually involves, what it costs in the Kootenays ($2,500–$4,500 for a typical sub-slab depressurization system), and how to verify a C-NRPP-certified installer. The sub-slab depressurization explainer walks through the install itself.

A single elevated short-term reading should always be confirmed with a long-term test before you commit to a mitigation project. Short-term variability is real, and a $40 confirmation kit is much cheaper than a contractor visit.

A note on what we don't sell

Kootenay Energy doesn't sell radon test kits. We have no affiliate relationships with BC Lung, Airthings, Ecosense, or anyone else in this space. The recommendations above are the same advice we'd give over coffee — buy the cheap accurate kit, escalate to a digital monitor only if you have a specific reason to want continuous data, and call your library before assuming free kits are still on the shelf.

If your test result comes back elevated and you want a hand-off, run the calculator or get in touch via the radon pillar page. We match elevated-result homes to vetted local C-NRPP-certified mitigation specialists. The installer pays a small referral fee; you pay them their normal rate. No charge to you for the introduction.

Test first. Then decide.

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External references:

• BC Lung Foundation — Radon Test Kits
• Health Canada — Radon Reduction Guide for Canadians
• BCCDC — Radon hub
• Take Action on Radon — BC
• C-NRPP — directory of certified measurement and mitigation professionals