Absolute isotopic abundance ratios and atomic weight of magnesium

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 (6), 453-458
https://doi.org/10.6028/jres.070a.037

Abstract

Absolute values have been obtained for the isotopic abundance ratios of magnesium, using surface emission mass spectrometry. Samples of known isotopic composition, prepared from nearly pure separated magnesium isotopes, were used to calibrate the mass spectrometers. The resulting absolute values are 25Mg/24Mg = 0.12663 ±0.00013 and 26Mg/24Mg = 0.13932 ± 0.00026, yielding an atomic weight (12C = 12) of 24.30497 ±0.00044. The indicated uncertainties are 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

ABSOLUTE RATIOS
ATOMIC WEIGHT
ISOTOPIC ABUNDANCES
MAGNESIUM

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