91-day dosimeter or a digital radon monitor
A 91-day detector stays in place, then the lab calculates an average. That is the form Health Canada compares with the guideline. A 4-day test is a short reading for a deadline. A continuous monitor plots points through the day: useful to see the night, a fan that stopped, or a window left open.
Looking at the screen on a Tuesday and deciding “it’s fine” misses the other 90 days. Leaving a monitor for a year is a different plan, if you know which average it calculates and which room it sits in. 4 days or 91.
References: Health Canada, radon: what you need to know and the 200 Bq/m³ guideline. The two-year window between 200 and 600, and the one-year window above 600, come from Health Canada’s guide for radon measurements in homes.
The 4-day test is a first reading. The 91-day test covers the minimum of three months Health Canada asks for. Both are $59 before tax. Shipping, the prepaid return and the lab are included. Tax is extra. The PDF report goes out within 2 business days after the lab receives the detector.
Above 200 Bq/m³, mitigation starts with a quote. Gaz Radon is C-NRPP certified for testing and for installation, and ships kits across Canada.
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