Radon Inspections

Testing Services

Did you know that in a survey of Canadians completed by the Canadian Cancer Society that 51% of those polled said they would move if they found out they had radon? 96% of those polled had not even tested their home yet. What are you waiting for? It all starts from testing. Take the first step on knowing and reducing your health risk from this known carcinogen.

There are many types of tests and testing equipment available on the market today. Make sure the test device you are using is listed by the C-NRPP or the NRPP as an approved device. We use state of the art testing equipment that is listed by both organizations. All equipment is recalibrated on an annual basis and follows strict protocols for quality assurance set forth by both the C-NRPP and the NRPP. This ensures you are getting the best radon test.

Although Health Canada recommends long term testing over short term testing, you should test for a minimum of 30 days before you base a decision in regard to mitigation. However short term testing can play a role in aiding your decision; such as if you come in at a very high radon level, you may then wish to follow up with an additional short term test for confirmation, rather than being exposed unnecessarily longer to elevated radon levels while waiting for the long term test duration to finish. By using a certified measurement professional with properly maintained and certified equipment, you can be assured you will have the best radon test possible over any test duration.

There are DIY type tests that you can purchase and complete yourself. However, there are things to watch out for such as: is the test outdated? does the lab send you the radon test report directly? does the test come with well explained directions for deployment? Does it get shipped immediately to the lab for analysis, or will it be collected and left until a “bulk amount” of exposed tests can be shipped to the lab? in the case of “bulk shipments”, how are they kept in order to ensure they are all separate and ensure your test remains yours? Bottom line is that it takes a long time to complete a good test and some factors may very well compromise your test results. See our full line of testing options to help you obtain the highest quality assurance of your radon test result.

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Please note that Interior Radiation Protection Services Ltd. and Health Canada both recommend using long-term tests (at least 91 days).  For the 91-day tests provided by IRPS, it is recommended that tests be performed during the heating season (within approx. October to April).

The optimal time of year for testing is over the colder months from October to April. This will generally be the highest radon levels of the year. A long term test of a minimum of 91 days up to one year would be the most accurate indication of your radon exposure risk.

Interior Radiation Protection Services offers the following  Testing services:

  • Post mitigation follow up testing
  • Long term testing
  • Short term testing
  • Residential testing
  • Large building testing
  • Radon in water testing
  • Soils testing (for radon)
  • Counter top and materials testing (for radon

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Radon in Water 

A small water sample is placed in the bottom of a glass jar.  An E-PERM® radon monitor is suspended in the air phase above the water. The lid of the flask is closed and sealed to make it radon-tight. Radon reaches equilibrium between the water and air phase.  At the end of the desired exposure period, the flask is opened and the E-PERM® removed.  The average radon concentration in the air phase is calculated using the standard E-PERM® procedure.  A calculation using this air concentration in conjunction with the other parameters gives the radon concentration of the water.


Radium Concentration in Soil

The procedure for measuring radium in soil is similar to that used for measuring radon in water.

A soil sample, weighing about 30 grams, is dried and humidified with 30% moisture. It is placed in a Petri dish and lowered to the bottom of the analysis bottle. An E-PERM® is suspended from the top of the lid. Radon emanated from the sample accumulates for a period from 5 to 15 days. At the end of the exposure period, the E-PERM® is taken out and the average radon concentration is calculated.

Using this information it is possible to calculate the radium concentration by assuming an emanation coefficient of 0.25. This coefficient is usually valid for most soils.

Radon Flux from Ground

Radon Flux from Ground, Soils, Surfaces and from Building Materials

There are several applications for procedure. These include:

  1. Measuring radon flux from the uranium mill tailings
  2. Estimating indoor radon potential of building sites
  3. Uranium prospecting
  4. Radon emanation from objects and building materials

The E-PERM® H chamber is modified to feature a large, carbon coated Tyvek® diffusion window. The chamber is vented by filtered outlets so that it will not accumulate radon. When the E-PERM® flux monitor is placed on radon emanating surface, the radon enters through the Tyvek® barrier and exits through the vents. The semi-equilibrium radon concentration established inside the chamber is representative of dynamic flux from the surface. Because of the equilibrium between the ground and outside environment through vents, the flux emanation from the ground is not disturbed.  The electret discharge rate of the electret is a measure of the radon flux. E-PERM® flux monitors are calibrated on the well-characterized radon flux beds at CANMET (Canada). These flux beds consist of 226Ra bearing material (well-characterized uranium tailings) 5.5 cm thick and 5 meter in diameter. The bed is precisely characterized by CANMET to provide a radon flux of 7.7 ± 1.1 pCi m2 sec-1 ( 7.7 flux units).

To measure Radon emanation rates from objects and building materials), the object is enclosed in an accumulator along with the E-PERM® radon monitor.

Test Chamber

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