Article about "Isotopic Compositions of the Elements 1997" from International Union of Pure
and Applied Chemistry (22 pages).Department of Applied Physics, Curtin University of Technology, Perth, Australia. Institute for Reference Materials and Measurements, European Commission, Geel,Belgium.
The Commissions Subcommittee for the Isotopic Composition of the
Elements has carried out its biennial review of isotopic compositions, as
determined by mass spectrometry and other relevant methods. This involves a
critical evaluation of the published literature, element by element, and forms the
basis of the Table of Isotopic Compositions of the Elements as Determined by Mass
Spectrometry presented here. New guidelines have been used to arrive at the
uncertainties on the isotopic abundances and there are numerous changes to the
Table since it was last published in 1991. Atomic Weights calculated from this table
are consistent with Ar(E) values listed in the Table of Standard Atomic Weights
