Dosimeter or monitor: the 91-day average is what the guideline uses
A long-term detector stays in place, then the lab calculates a mean. A continuous monitor shows the night, a stopped fan, an open window....
Oct 25, 2026
Scientific Articles
108 articles
Why radon rises at night: the house pulls on the soil
Warm air leaves through the top. The lower floor goes under slight suction and draws soil gas in. Windows stay shut. A monitor shows the ...
Oct 25, 2026
The annual radon average: one hour is not the guideline
The Canadian guideline is an annual average. Levels rise at night and in winter. A 91-day test during the heating season is the closest p...
Oct 25, 2026
Radon above 600 Bq/m³: Health Canada’s timeline is one year
Above 600, the homes measurement guide asks you to act within a year. The fix is the same: suction under the slab, exhaust above the roof...
Oct 25, 2026
Between 200 and 600 Bq/m³: act within two years
Health Canada’s homes guide: reduce radon within two years in this range, and within one year above 600. There is no risk-free level unde...
Oct 25, 2026
How to read a radon report: unit, dates, and the room
Compare Bq/m³ with 200. Multiply pCi/L by 37. A clean six-day PDF is not an annual average. If the room is missing, the number still belo...
Oct 25, 2026
Two radon tests, two results: 80 and 320 can both be real
Four days against 91. August against January. Basement bedroom against the kitchen. Do not average them on a calculator. The long winter ...
Oct 25, 2026
Opening windows and radon: the number falls, then the house closes
Outdoor air dilutes radon while the windows are open. At −20 °C they will not stay open for three months. The annual average includes tho...
Oct 25, 2026
Granite and radon: the counter is visible, the slab is the source
Stone can contain a little uranium. In a ventilated kitchen that share is small next to gas entering through the slab. A basement at 400 ...
Oct 25, 2026
Radon in well water: swallowing it is not the main path
Health Canada treats ingestion as negligible. The gas leaves at the tap and can raise the air in the kitchen and shower. If water is abov...
Oct 25, 2026
Mobile homes and radon: the skirt can trap soil gas
A tight skirt and holes around the plumbing let soil gas collect, then enter the kitchen and bedrooms. The detector goes in the occupied ...
Oct 25, 2026
A basement apartment: the priority case in the Health Canada guide
Someone lives there more than four hours a day, at the lowest level, often on the slab. The detector goes in that bedroom or living room,...
Oct 25, 2026
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