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Radon is not a monster
hiding underneath your bed...

Radon is a real, odorless gas you might find inside your home.
It can be harmful depending on the concentration and
is considered the second leading cause of lung cancer.

Buy your measuring device now!

*See terms and conditions for the purchase of a measuring device at the bottom of the page



Radon is not a monster hiding under your bed...

Radon is a real, odorless gas you might find inside your home. It is considered the second leading cause of lung cancer.



Radon is a radioactive gas present around the globe. It is the result of uranium decay and is naturally present in the soil. Once in its gaseous state, it can move through the soil to the surface. Outdoor, it is too diluted and its concentration is too low to be harmful. It’s when it infiltrates and accumulates in basements that radon can reach a harmful concentration. This happens more in enclosed or poorly ventilated areas since radon accumulates more quickly that it is extracted.

About radon, did you know that…


…concentrations may vary from neighborhood to neighborhood, even from one room of your house to another


…16% of all lung cancers in the country are directly related to exposure to radon


…Legault-Dubois is accredited by the Canadian National Radon Profiency Program (C-NRPP)



…radon is odorless and colorless so its measure remains the only recognized method for its detection


…Legault-Dubois tested more than 250 schools in Quebec for radon as part of a national screening program


…radon concentrations above 200 Bq / m3 in a residence can be considered as a hidden defect


Radon can enter a house by the smallest opening!

Radon can enter from any opening where the house is in direct contact with the soil, regardless of the year of construction. Where radon is concerned, no house is immune.

Radon penetration points are multiple (see diagram). The elements affecting radon concentrations inside a house are:

soil characteristics
type of construction
condition of the foundation walls
lifestyle of occupants
weather variations (ex: barometric pressure)



Health Canada has established the maximum concentration considered safe in a building at 200 Bq/m3 . For a reliable radon measure, the national organization recommends a long-term test (between 3 to 12 months).


This measure helps you determine the remedial work need, something a short-term measurement can’t do (ex. 3 days measure).


The Alpha track detectors used by Legault-Dubois meet all these criteria. Expose these devices inside your house for a predetermined period (minimum 3 months) then send them to the laboratory for analysis. The results will indicate the average radon concentration.


Apprehensions? Don’t worry, our experts can assist you from beginning to end.



Buy it online

Want to save time? Sold for from $80 our radon kit includes clear instructions on how to install the device and how to send it to the laboratory.

See conditions below



Contact us before buying

Still have questions? Looking for multiple devices? You’re not comfortable with online transactions? Contact us at 514-286-0550 and we’ll answer all your questions.

We'll take care of everything

Don’t feel like doing it yourself? No problem, our certified technicians offer a complete service. From the installation to the interpretation of the results, we take care of everything!

*Additional information on buying a measuring device (without the home installation service)

The cost of a device bought online includes taxes (GST-QST) in effect as well as the shipping cost of the delivery to your home. The shipping fees for sending the device to the lab are not included.

The device must be sent to the laboratory before its expiration date. Following the exposure period, the device must be sent to the laboratory for analysis (please refer to the procedure file sent with the unit). A report will be sent within approximately 14 days. This time can vary depending on how busy the lab is. Given that the client sends the device to the laboratory, Legault-Dubois is not responsible for a refused device by the laboratory from exposure exceeding the period required by the Protocol or mishandling of the device . Buying an online device does not include the installation service that can be offered by Legault-Dubois. Legault-Dubois declines any liability with regard to improper handling of the device, the chosen location of the devices, the exposure time, sending laboratory equipment and interpretation of results. The device is intended only to measure the concentration of radon. Is excluded from the cost of the device: the drafting of a quote for corrective work, achieving mitigation work (remediation) where applicable and shipping cost to the lab.

Handling devices during the measurement period may affect the accuracy of the results. The results correspond only to the measurement performed during the given period. So there may be a disparity between the results obtained during measurement and those obtained when measuring the following year. The measurement performed during the heating period provides the results usually the highest of the year in a building. Any changes to the building (changing the central ventilation system (HRV), addition to the house, major renovations, etc.) may influence the results. If in doubt about the procedure, please contact our analysis department at 514-286-0550.


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