Temperature and humidity consideration for calculating airborne 222Rn using activated charcoal canisters.
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 degrees C absorb 68% more radon than at 30 degrees 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.
El Samman
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Faculty of Science, Menoufia University, Shibin El-koom, Egypt. hsamman@aucegypt.edu
Arafa
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W
Abd alla
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A
D000388:Air / Q000032:analysis*; D002138:Calibration; D006813:Humidity; D011886:Radon / Q000032:analysis*; D017687:Radon Daughters / Q000032:analysis*; D012044:Regression Analysis; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D013696:Temperature
D017687:Radon Daughters; D011886:Radon