Study about the radionuclides implanted on glass surfaces for the estimation of retrospective indoor radon concentrations

Conversion factor and other variables in the indoor retrospective radon activity concentration studies

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.