Airborne Radon-222 Measurement by Active Sampling with Charcoal Adsorption and Gamma-Ray Spectrometry
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A simple method for measuring radon concentration in air is presented. Airborne radon is adsorbed in a charcoal bed by an active air sampling. In time, the adsorbed radon comes to attain radioactive equilibrium with its short-lived progeny <SUP>214</SUP>Pb. Utilizing this fact, radon concentration is derived from γ-ray measurement of <SUP>214</SUP>Pb. This method is estimated to be capable of detecting radon concentration in air down to 0.79Bq•m<SUP>-3</SUP>. The adsorption coefficient obtained with the method is compared with what is obtainable with passive sampling. Applications of this method to indoor and outdoor radon measurements are described.
- Journal of Nuclear Science and Technology
Journal of Nuclear Science and Technology 35(10), 728-732, 1998-10-25
Atomic Energy Society of Japan