TY - CONF A1 - Vogl, Jochen T1 - Plan for comparison on absolute Cu isotope ratios by applying the isotope mixture approach N2 - Based on a previously circulated questionnaire, the plan for a key comparison is presented which focuses on the determination of absolute copper isotope ratios by the means of synthetic isotope mixtures. T2 - IRWG Meeting CY - Online meeting DA - 12.05.2022 KW - Absolute isotope ratio KW - Traceability KW - CCQM PY - 2022 AN - OPUS4-55161 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -