Abstract
Boron isotope ratio measurements are carried out by negative thermal ionization mass spectrometry. For that purpose, a boron compound together with a lanthanum nitrate addition is deposited on the filament of a single-filament thermal ion source. At a filament temperature of 1000°C negative boron dioxide ions are measured, producing an ion intensity which is a factor 100–1000 higher in comparison with the positive thermal ion beam. Without lanthanum addition, the attainable negative ion beam is lower by a factor of 0.001–0.0001. Using boracic acid, borax and sodium fluoborate for sample, relative external standard deviations of 0.08 % are available for the boron isotope ratio measurement.
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