Open AccessAbsolute Isotopic Abundance Ratio and Atomic Weight of a Reference Sample of Gallium
Author(s) -
L.A. Machlan,
J.W. Gramlich,
L.J. Powell,
G.M. Lambert
Publication year - 1986
Publication title -
journal of research of the national bureau of standards
Language(s) - English
Resource type - Journals
eISSN - 2376-5259
pISSN - 0160-1741
DOI - 10.6028/jres.091.036
Subject(s) - gallium , atomic mass , natural abundance , isotope , analytical chemistry (journal) , mass spectrometry , chemistry , isotopic ratio , thermal ionization mass spectrometry , atom (system on chip) , abundance (ecology) , ionization , atomic physics , ion , physics , nuclear physics , chromatography , organic chemistry , fishery , computer science , embedded system , biology
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 69 Ga/ 71 Ga ratio is 1.50676±0.00039, which yields atom percents of 69 Ga=60.1079±0.0062 and 71 Ga=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.