A simple correction method for isobaric interferences induced by lead during uranium isotope analysis using secondary ion mass spectrometry
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Isobaric interference is a major limitation of secondary ion mass spectrometry. We developed a simple correction method for polyatomic mass interferences from lead in isotope ratio measurements of uranium. Lead-generated isobars were measured to determine their formation rates relative to lead isotopes. The rates were used to mathematically subtract the isobar contributions from the signal intensities in the uranium mass range. The correction method was successfully verified using mixed uranium-lead samples (oxide powder and solution-dried residue).
KeywordsSecondary ion mass spectrometry Uranium isotope analysis Lead-induced isobaric interference
We thank Ms. Ranhee Park for assistance with the TIMS measurements of the DU material used in this study. This work was supported by the Nuclear Safety Research Program through the Korea Foundation of Nuclear Safety (KOFONS), granted financial resource from the Nuclear Safety and Security Commission (NSSC), Republic of Korea (1405020).
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