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Characterisation of contaminated and activated decommissioning waste require sampling of the studied material for the analysis of different radionuclides. The volatility of  3 H and  14 C can lead to the loss of the analytes in sampling of solid materials since most often at least some heat is involved in the sampling technique. Especially  3 H can be lost in cases when it is present as tritiated water (HTO) due to the evaporation of water even at low temperatures. Therefore, in this study, the  3 H and  14 C speciations are discussed. Consequently, a drilling sampling technique was developed in order to capture the released  3 H and  14 C in absorption solutions and measured using liquid scintillation counting. The sampling technique was tested on an activated concrete core. The collected samples were analysed for  3 H and  14 C (activity concentration and speciation) using a thermal oxidation technique. The results showed that a significant amount of  3 H was released during sampling even though the majority of  3 H was strongly bound in the activated concrete. The studied activated concrete did not contain measurable amount of  14 C and therefore speciation studies were not possible.

Release of 3H and 14C during sampling and speciation in activated concrete