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.