Radon determination by activated charcoal adsorption and liquid scintillation measurement

A passive diffusion method for the determination of radon concentration has been optimised and calibrated. The device consists of a scintillation vial containing activated charcoal, a diffusion barrier and a desiccant agent. The response to diverse atmospheric humidity and variable exposure interval s was studied. The result is a detector independent of atmospheric humidity till 7 days of exposure. The method was compared with electret detectors ( US EPA) with very satisfactory results. The advantages of this method are i ts simplicity, low cost, low detection limit, the total automatization of t he measurement and its total independence of humidity to measure in a wide range of radon concentrations.