Radon diffusion coefficient measurement in waterproofings – A review of methods and an analysis of differences in results

This paper summarizes information about 16 measuring methods for determining the radon diffusion coefficient of waterproofing materials. We have found that the differences in results for identical membranes, which can be as high as two orders of magnitude, can mainly be attributed to insufficient duration of the tests, insufficient radon concentration to which the samples are exposed, and the use of steady state calculation procedures for data measured under non-steady state conditions. - Highlights: ► Paper summarizes 16 measuring methods for determining the radon diffusion coefficient. ► The methods studied here differ in a great number of important factors. ► Numerical simulation used to find the most important factors influencing the results.