Intercomparison exercise on difficult to measure radionuclides in spent ion exchange resin

Abstract A need for method validation in radiochemical analyses of decommissioning waste is a challenging task due to lack commercial reference materials. Participation an intercomparison exercise one way laboratory assess their performance and validate analysis results. three-year project within the Nordic Nuclear Safety Research (NKS) community was initiated order carry out exercises on difficult measure (DTM) radionuclides real waste. Both Non-Nordic laboratories participated. This paper reports results from final year focusing beta- gamma emitter (i.e., easy measure, ETM) spent ion exchange resin. The assigned values were derived participants’ according ISO 13528 standard performances assessed using z scores. showed generally good both DTMs ETMs.