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Every two years a subcommittee of IUPAC's Commission of Atomic Weights and Isotopic Abundances (CAWIA) reviews the isotopic compositions of the elements, as determined by mass spectrometry and other relevant methods. This Subcommittee for Isotope Abundance Measurements (SIAM) was set up in 1985 as the successor of the Subcommittee on the Assessment of the Isotopic Composition, (SAIC, 1973-1985). The intention of SIAM is to provide scientists with reliable values for the isotope abundances of the naturally occurring elements accompanied by reliable uncertainties on all of these abundances. All the literature available to SIAM in August 1989 was examined and a table of recommended isotope abundances for the elements was produced. Only values for normal terrestrial samples are included. The evaluated limits of published values cover the range of probable variations of the materials as well as experimental uncertainties. Uncertainties quoted are from 1 to 9 in the last digit except for a few cases where rounded values would be outside the observed range. In those cases, uncertainties greater than 9 have been used.

Additional information

Authors: DE BIEVRE P, JRC Geel (BE);TAYLOR P D P, JRC Geel (BE)
Bibliographic Reference: Article: International Journal of Mass Spectrometry and Ion Processes, Vol. 123 (1993) pp. 149-166
Record Number: 199310513 / Last updated on: 1994-11-29
Original language: en
Available languages: en
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