Radon retention in high humidity places

With the aim of determining radon content in high humidity zones a two-step radon measuring device has been designed. The first step contains a certain amount of silica-gel as a desiccant agent, and the second one contains an activated charcoal specially adapted for radon adsorption. Both stages are modular, so that an analysis of both humidity and radon distribution can be made. For its design, the connective-diffusive transport equation has been solved for the sampling device using data obtained by the charcoal manufacturer, mainly the distribution coefficient for radon. This guarantees that the sampling device retains radon with an efficiency of 100%. Experimental measurements have been made with it and satisfactory results are obtained. (author)