Charcoal Canisters

RTCA's Charcoal Canisters contain small quantities of activated charcoal. Radon is adsorbed onto the charcoal and then measured by counting with a sodium iodide detector.

Over the past 20 years activated charcoal collectors have been used to measure radon in the indoor environment during surveys of large areas in large buildings or in private homes. Open face charcoal canisters were first used successfully in the early 1970’s to measure the radon flux from the surface of soils in Central Florida a region with high phosphate deposits (Countess, 1976).

Calibrated open face canisters exposed up to 3 days in a private home where the radon varied by a factor of 2, the average of the canisters was <2% low from the average of the continuous radon monitor. Similarly, the average of the open face canisters exposed in a radon chamber where the concentration of radon varied by a factor of 10, was <1% different from the average measured with the continuous radon monitor. The use of open face canisters for exposures lasting 2-3 days are appropriate in environments with humidity up to 70%.  Open face canisters can be used with confidence for radon measurements lasting 2-3 days as is commonly used in real estate transactions. Open face charcoal canisters are very sensitive yielding the highest response in terms of net cpm / 4 pCi/L.

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Our Home Inspectors Perform Inspections in the Following Areas:
South Bend, Mishawaka, Granger, Osceola, Lakeville, Elkhart, New Carlisle,
Walkerton, Nappanee, North Liberty, Niles, MI, Edwardsburg, MI

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Certified Home Inspections of Northern Indiana, LLC
Education and Discovery of Maintenance in Homes™
Phone: 574-231-5000 • Fax: 574-231-0557
19237 Edinburgh Drive, South Bend, IN 4661