View More View Less
  • 1 University of Helsinki Department of Radiochemistry Unioninkatu 35 SF-00170 Helsinki 17 Finland
  • 2 Technical Research Centre of Finland Reactor Laboratory Otakaari 3A SF-02150 Espoo 15 Finland
Restricted access


The chemical aspects of isotopic fractionation in a multiple filament thermal ionization source were investigated. Samples of uranium were loaded as nitrates, chlorides and sulphates. The dependence of measured isotopic ratios on the filament material and the chemical form of the loading solution was studied. The dependence of the formation of uranium and its oxide ions on various chemical and instrumental conditions were investigated using tungsten and rhenium filaments.