Apply the Canadian guideline
The Government of Canada guideline recommends corrective action when the annual average concentration exceeds 200 Bq/m³ in a building’s normally occupied area.
- Test at the lowest occupied level
- Place the detector under the protocol
- Record unusual conditions
- Report the actual test duration
- Take faster action at higher concentrations
Respect the measurement period
Health Canada recommends a long-term test lasting 3 to 12 months, with a minimum of 91 days, ideally during the heating season.
- The pre-purchase module may remain pending
- No promise of a reliable one-visit result
- Protect the device from movement
- Verifiable start and end dates
- Laboratory or service appropriate to the method
Mitigate, then confirm
When work is needed, a competent person selects a method suited to the building. A post-mitigation test confirms actual system performance.
- Building diagnostics
- Source reduction or depressurization
- Safe exhaust location
- Labelling and maintenance instructions
- New long-term measurement