TEMPERATURE AND HUMIDIDTY CONSIDERATION FOR CALCULATING AIRBORNE 222Rn USING ACTIVATED CHARCOAL CANISTERS
- 1 July 2002
- journal article
- research article
- Published by Ovid Technologies (Wolters Kluwer Health) in Health Physics
- Vol. 83 (1), 97-104
- https://doi.org/10.1097/00004032-200207000-00011
Abstract
A radon calibration chamber with variable and controlled radon concentration, humidity, and temperature was constructed and used to extend the calibration range of open-faced and diffusion-barrier charcoal canisters for higher temperature and humidity applications. The optimum exposure time to achieve the best detection accuracy and the lowest minimum detectable level was between 2 and 4 d depending on relative humidity for open-faced canister and 4 d for diffusion barrier canister over a range of humidity. The dependence of radon adsorption on the temperature was also studied for both types of canister at different values of relative humidity. The open-faced canisters at 15°C absorb 68% more radon than at 30°C over the range of humidity from 20% to 80%. The diffusion-barrier canister shows insignificant variation in absorption over the same range of temperature and humidity.Keywords
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