Our Services
How Radon Gas is Measured ? 
Radon gas is typically measured with a "radioactivity" detector  appropriately placed in your house or building. 

The best time to detect radon gas is in the fall-winter-early spring months  when houses are closed up more and radon levels are highest, although a radon gas test can be performed            anytime.
Short-term Testing
Normal "short-term"  (ST) detection 
time lines are usually from 2 to 90 days (using traditional charcoal,  charcoal  liquid  scintillation, or E-perm detectors, with laboratory analysis).

We use a "short-term integrated reading" (2-7 days)  with Continuous Radon Monitor (CRM) (RadStar RS 300i) for immediate radon gas levels and for real estate transactions   (co-located detectors), Tarion New Home Warranty 
preliminary testing, for school or public
buildings followup testing and post-mitigation level confirmation testing.

The RadStar RS300i gives  integrated  hourly readings over the 2-7 day test period and will generate a graph and data printout for the testing period. This is immediately available to the client after the testing.

We also now can make 10-30 days short-term measurements using the state-of the-art Corentium Pro CRM. (pictured here) A report is immediately available after the test and is emailed to the client. This includes a average radon level, hourly data for the last 48 hours, humidity, temperature and barometric pressure data over the test period presented in graphic format.

We also use the Landauer Rapidos alpha track detector (pictured below) for 10-30 day radon gas measurements. This is analyzed in the US and a report is available within 2-3 weeks post testing.

Landauer Rapidos 10-30 day
Alpha Track Detector


Short-term (ST) readings fluctuate widely and are only indicative of levels at a particular point in time and should not be used for predicting annual levels or for mitigation decisions.  This testing
requires  "closed house" conditions for 12 hours preceding and during test periods. The 10-30 day test will help to level out the fluctuations.
Long-term Testing
The "long-term" (LT) detection is from
91 -365 days and is recommended by Health Canada, Middlesex-London Public Health Department and other Health Units to provide for better
 accuracy and more accurate reflection of  annual radon gas levels, mitigation  (remedial action) determination, and for a Tarion Warranty confirmatory test. This requires normal house living conditions during the test.
We use an alpha track detector  ( Landauer Radtrak2 ) for long  term measurements.  Any short-term reading above the Health Canada limit (200 Bq/m3), should be followed up by a longer term test.  Mitigation decisions MUST be based upon long-term test results.  Radon levels fluctuate daily and the long- testing 
procedures  are designed to average the results over the test period.                                                            
Long-term test kits (Accustar AT-100) are available for DIY testing at $49.95 + HST + shipping (at cost) to you if needed.This includes analysis and a pre-paid mailer to the US and customs declaration. A report is emailed to you usually within 3 weeks.  I usually get a copy of the results so I can discuss with you if needed.      

Radon in well water testing  (Accustar
kit) is now available for rural testing. Test results are available within a few days of sample receipt by the US testing lab.  Cost is $225 + HST. For DIY well water testing,  the cost is $140 + HST + shipping to you. Cost includes instructions, data sheet, a pre-paid FedEx (overnight) mailer to the US lab and a heater pack to prevent freezing of the sample. Tempertuares in a plane cargo hold can be really low. Also the lab MUSTincluded in the fee.

 Accustar Water Testing Kit
Appointments may be booked for a free consultation any time during the day or evening. Tests are performed around your schedule and may be conducted during day, evenings or weekends.
We are located at
39 Concord Crescent
London, ON
N6G 3H4 

519-709-0673 (main)
519-709-5239 (alternate)