CCRI(II) activity comparison of 241Pu: CCRI(II)-K2.Pu-241

Abstract

In 2010, seven laboratories took part in the CCRI(II) key comparison of activity concentration measurements of 241Pu, CCRI(II)-K2.Pu-241, using seven different methods. The spread of all results except one is 4 × 10−2 in relative terms. The results based on the CIEMAT/NIST efficiency tracing method are shown to be dependent on the beta spectrum shape selected and further work is proposed.The key comparison reference value has been determined as the arithmetic mean of six independent results based on four different methods. The results of the comparison have been analyzed with respect to the key comparison reference value. The degrees of equivalence relative to the key comparison reference value have been approved by the CCRI(II) and are published in the BIPM key comparison database.Main text.To reach the main text of this paper, click on Final Report. Note that this text is that which appears in Appendix B of the BIPM key comparison database kcdb.bipm.org/.The final report has been peer-reviewed and approved for publication by the CCRI, according to the provisions of the CIPM Mutual Recognition Arrangement (CIPM MRA).