CIAAW

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The Periodic Table of the Isotopes, published by International Union of Pure and Applied Chemistry (IUPAC), is now available from the Commission on Isotopic Abundances and Atomic Weights, which is a commission under the Inorganic Division (Division II) of IUPAC.

 

Purpose of the Commission
For several decades the Commission on Isotopic Abundances and Atomic Weights (CIAAW) has met biennially, at or prior to, the IUPAC General Assembly. CIAAW evaluates the scientific literature and publishes, at regular intervals, a Table of Standard Atomic Weights, a Table of Isotopic Composition of the Elements, and a Review of Atomic Weights of the Elements. As needed, abridged Tables of Standard Atomic Weights and recommendations on reporting of isotopic data are published.

In support of the IUPAC project “Development of an isotopic periodic table for the educational community”, CIAAW presents the IUPAC Periodic Table of the Isotopes in full resolution (1 Oct 2013, 600 kB).

Download the IUPAC Periodic Table of the Isotopes

Links of Interest
Société Française des Isotopes Stables
SFIS

Recent CIAAW News

• (4 Mar 2014) CIAAW has published the "Assessment of international reference materials for isotope-ratio analysis (IUPAC Technical Report)".

The report is available from IUPAC publisher DeGruyter here.

• (24 Sep 2013) Standard Atomic Weights of 19 elements have changed.

The 2013 Standard Atomic Weights are available here and here as an Excel file.

• CIAAW has also resolved to reclassify thorium from a mono- to a bi-isotopic element owing to the significant abundance of the thorium-230 isotope in deep seawaters.

• CIAAW also recommended a new standard value for the isotope ratio of uranium, N(238U)/N(235U) = 137.8(1), in naturally occurring terrerestrial materials.

2010 Commission on Isotopic Abundances and Atomic Weights | a commission of the International Union of Pure and Applied Chemistry