Some inspection companies offer a radon test conducted during the inspection. A test of about 2 hours.<\/u> The inspector uses a digital detector that displays a result after 10 minutes. That’s reassuring, right? At the end of the inspection, which lasts about 2 hours, this inspector can tell me if I am near or not the limit of 200 bq\/m3. For example, if the result is 95 bq\/m3 after 2 hours. The inspector tells me that I am far from 200 bq\/m3 and that everything is okay and that this test is not precise.<\/u> Is this test valid? Can I sleep peacefully knowing my family is safe? NO! <\/p>
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The CARST (Canadian Association of Radon Scientists and Technologists) issued guidelines for PNCR-C (National Radon Proficiency Program - Canada) professionals in 2018, which can be consulted at the following address: <\/span>https:\/\/carst.ca\/resources\/Documents\/Directives%20d%27ACSTR%20-%20immobiliere.pdf <\/span><\/p> <\/p>
A preliminary test should be conducted over a minimum of 2 days and a maximum of 7 days.<\/span><\/u> The ideal period is 4 days.<\/span><\/strong> According to scientific data, even a continuous measurement device requires a minimum measurement period of 4 hours before the data can subsequently be usable. <\/span><\/p> <\/p>
The recommended devices for a short-term test are either a continuous measurement detector, an alpha track detector, or an ion chamber and electret detector. Digital devices are currently not among the recommended devices. <\/p> <\/p>
Why does Health Canada not recognize digital detectors as valid? It is impossible to validate the calibration accuracy of these devices or to modify their parameters. A test conducted by Health Canada in 2020 with this type of device showed significant variability between devices of the same model. For example, a device of model "X" from manufacturer "Y" provides a value 20% above the radon level maintained in the test chamber, while an identical device shows 20% less. What will be the reliability of your device "X"? It is impossible to know if it displays a real rate, above or below the actual radon level present. Suppose the device shows 170 bq\/m3. If it displays a high reading, the value should be reduced by 20%, resulting in 136 bq\/m3. Conversely, if it shows a low reading, 20% should be added, resulting in 204 bq\/m3. This significant margin of error can create a false sense of security even when using this type of device long term. The use of a certified device is recommended at all times according to recognized protocols, whether for short- or long-term testing. <\/p> <\/p>
Radon fluctuates over time. To protect the public, CARST issued a directive lowering the minimum rate compared to the target rate for long-term tests. It is only 75 bq\/m3 during the heating period and 50 bq\/m3 during the summer period. Beyond these thresholds for a short-term test, a long-term test is recommended. <\/p> <\/p>
Do not be misled by a false sense of security. Work with a recognized PNCR-C professional or an inspector who has completed appropriate training and uses a device according to recognized measurement protocols.<\/strong><\/span><\/p> <\/p>
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