Abstract
Studies are reported on the evaporation and ionisation behaviour of uranium (U) and plutonium (Pu) under conditions of their simultaneous mass spectrometric analyses using a double rhenium filament assembly, a multicollector Faraday cup detector system and a synthetic mixture of SRM-200-U and SRM-947-Pu with the UPu ratio as 10. The U+ and UO+ ions start appearing at an evaporation filament temperature lower than that for appearance of Pu+. However, the ion current of Pu+ is 5–10 times greater than that of U+. The coexistence of oxides of Pu and U on the evaporation filament appears to enhance the stability of UO+. Two different approaches are compared to account for 238pu isobaric interference at 238U during simultaneous isotopic analyses of U and Pu from the same filament loading. The K factor values for U and Pu during their simultaneous mass spectrometric analyses are lower compared with those observed previously when U and Pu are analysed from separate filament loadings with chemically pure fractions of each.
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