Radon in water standard samples for intercomparison experiments

The measured radon concentrations in water samples were generally lower than the calculated ones (systematic difference of about 13%), but the relation between these two quantities was linear in the whole range of measured values. It was also observed that there was no difference in results between the samples collected at different levels in the water volume. Furthermore, the optimal relaxation time was established. Therefore, the proposed method can be successfully used in radon-in-water intercomparison experiments.