Abstract
A procedure for the determination of the bromine isotopic ratio by using positive thermal ionization mass spectrometry of the Cs 2Br + ion has been investigated. The intensity of Cs 2Br + emitted from CsBr is considerably enhanced by the addition of graphite to the filament substrate during loading. Optimal conditions for measurement have been established. The bromine isotopic compositions, 79Br/ 81Br, in KBr chemical reagents have been measured to be 1.02654 ± 0.00012 with a precision of 0.011% (95% confidence limit). The isotopic ratios of bromine in bromides of different origins have also been measured and a significant variance of bromine isotopic composition has been observed.
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