An absolute value has been obtained for the isotopic abundance ratio of a reference sample of gallium (Standard Reference Material 994), using thermal ionization mass spectrometry. Samples of known isotopic composition, prepared from nearly isotopically pure separated gallium isotopes, were used to calibrate the mass spectrometers. The resulting absolute ⁶⁹Ga/⁷¹Ga ratio is 1.50676±0.00039, which yields atom percents of ⁶⁹Ga=60.1079±0.0062 and ⁷¹Ga=39.8921±0.0062. The atomic weight calculated from this isotopic composition is 69.72307±0.00013. The indicated uncertainties are overall limits of error based on two standard deviations of the mean and allowances for the effects of known sources of possible systematic error.
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Machlan et al. (1986) studied this question.
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