Absolute isotopic abundance ratios and the atomic weight of a reference sample of chromium
- 1 March 1966
- journal article
- Published by National Institute of Standards and Technology (NIST) in Journal of Research of the National Bureau of Standards Section A: Physics and Chemistry
- Vol. 70A (2) , 193-197
- https://doi.org/10.6028/jres.070a.016
Abstract
Absolute values have been obtained for the isotopic abundance ratios of a reference sample of chromium, using surface emission mass spectrometry. Samples of known isotopic composition, prepared from nearly pure separated chromium isotopes, were used to calibrate the mass spectrometers. The resulting absolute values are Cr50/Cr52 = 0.051859 ±0.000100, Cr53/Cr52 = 0.113386 ±0.000145, Cr54/Cr52 = 0.028222 ±0.000059, yielding an atomic weight (CI2=12) of 51.99612 ±0.00033. The indicated uncertainties arc overall limits of error based on 95 percent confidence limits for the mean and allowances for effects of known sources of possible systematic error.Keywords
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