Abstract
Estimation of indoor retrospective radon activity concentration can be performed by measuring the 210Po surface activity concentration of the radon progeny on mirrors. The conversion factor between the surface activity concentration of 210Po on mirrors and the retrospective activity concentration of 222Rn in the air was determined. Several places and some variables have been considered. Exposures were performed in places with moderate and high concentrations of 222Rn. The repeatability of results has been investigated. The dependence of concentration on exposure time has been checked. The effect of cleaning the mirror surfaces has been analyzed. The experimental results obtained for the possible 210Pb-210Po equilibrium inside the mirrors have also been studied and compared with the theoretically expected values.
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