BIPM comparison BIPM.RI(II)-K1.Ce-139 of activity measurements of the radionuclide 139Ce and links for the 1976 international comparison CCRI(II)-K2.Ce-139

Abstract

Since 1976, ten national metrology institutes (NMIs) and another laboratoryhave submitted 20 samples of known activity of 139Ce to theInternational Reference System (SIR) for activity comparison at theBureau International des Poids et Mesures. The activities ranged fromabout 0.5 MBq to 55 MBq. The degrees of equivalence between eachequivalent activity measured in the SIR and the key comparison referencevalue (KCRV) have been calculated and the results are given in the formof a matrix for ten NMIs and the BIPM. A graphical presentation is also given.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 BIPMkey comparison database kcdb.bipm.org/.The final report has been peer-reviewed and approved for publicationby Section II of the Consultative Committee for Ionizing Radiation(CCRI(II)), comparison identifier BIPM.RI(II)-K1.Ce-139, according to theprovisions of the Mutual Recognition Arrangement (MRA). The results of a CCRI(II) comparison held in 1976 that have been approved for provisional equivalence for this radionuclide have been linked to the SIR results. This has enabled another six NMIs and an international laboratory to have at least provisional degrees of equivalence in the key comparison database (KCDB), comparison identifier CCRI(II)-K2.Ce-139.