Abstract

Despite the resulting sacrifices in sensitivity, the analysis of plutonium isotopes by ICP-sector field mass spectrometry (SFMS) in higher resolution mode can be beneficial in resolving non-hydride polyatomic interferences. Prepared samples are normally first analyzed in low-resolution mode for maximum sensitivity. The acquired actinide peaks are then assessed for the presence of a polyatomic interference, evidenced by a measurable negative shift in mass position of the isotope of interest. If, based on this assessment, a polyatomic interference is suspected, medium-resolution mode is employed for unequivocal resolution of the analyte peak. Examples of Pu isotope data acquired in both low-resolution and medium-resolution modes are presented.