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The absolute abundance of the chromium isotopes in chromite |
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| Authors: | G D Flesch H J Svec and H G Staley |
| Institution: | Institute for Atomic Research and Department of Chemistry Iowa State University of Science and Technology, Ames, Iowa, USA |
| Abstract: | Isotopic assays have been made on the chromium in eighteen chromite samples from countries responsible for 81 per cent of the chromite production between 1900 and 1950. The use of mixtures of separated isotopes to determine the accuracy indicates that the measurements are absolute. On the basis of these assays, the natural abundances of the chromium isotopes in atoms per cent are: Cr50 = 4·352 ± 0·024, Cr52 = 83·764 ± 0·036, Cr53 = 9·509 ± 0·027, Cr54 = 2·375 ± 0·018. where the limits cited represent 3β. No variation in the isotopic composition of the chromium in any of the chromites examined was found within the stated limits. The chemical atomic weight, computed on the basis of these abundance values and the latest accepted values for the masses of the involved isotopes, is 51·9985 ± 0·0013. |
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