The article describes three interlaboratory experiments concerning 222Rn determination in water samples.
The first two experiments were carried out with the use of artificial radon waters prepared by the Laboratory
of Radiometric Expertise (LER), Institute of Nuclear Physics, Polish Academy of Sciences in Kraków in 2014
and 2018. The third experiment was performed using natural environment waters collected in the vicinity of the
former uranium mine in Kowary in 2016. Most of the institutions performing radon in water measurements in
Poland were gathered in the Polish Radon Centre Network, and they participated in the experiments. The goal of
these exercises was to evaluate different measurement techniques used routinely in Polish laboratories and the
laboratories’ proficiency of radon in water measurements. In the experiment performed in 2018, the reference
values of 222Rn concentration in water were calculated based on the method developed at LER. The participants’
results appeared to be worse for low radon concentration than for high radon concentrations. The conclusions
drawn on that base indicated the weaknesses of the used methods and probably the sampling. The interlaboratory
experiments, in term, can help to improve the participants’ skills and reliability of their results.
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