30 years of IRMM-1027 reference materials for fissile material accountancy and control: development, production and characterisation

Abstract The IRMM-1027 Large-sized dried (LSD) spikes are certified reference materials applied to measure the uranium and plutonium content of dissolved fuel solutions using isotope dilution mass spectrometry. High quality starting metals produce a stock solution, which is dispensed into individual vials down. present mixtures typically 50 mg 20% enriched U 2 239 Pu as nitrates, conditioned in an organic substance for stability. Each vial LSD spike comes with masses ( 235 238 U) isotopic composition associated uncertainty. This article will discuss major developments since production first batch reflect on current preparation certification approaches.