We report progress in developing resonance ionization mass spectrometry (RIMS) forquantifying isotope ratios in U and Pu for nuclear forensic applications. We highlight recentimprovements in instrumentation and methodology that have led to increased precision and stabilityin the measured isotope ratios. We also report measurements of U isotope abundance on severalworking reference materials and the corresponding uncertainty analysis. Finally, we will discussoutstanding issues for the routine application of RIMS to materials of nuclear forensics interest.
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