Update of the BIPM comparison BIPM.RI(II)-K1.Lu-177 of activity measurements of the radionuclide ¹⁷⁷Lu to include the 2013 result of the FIN-HH (Romania), the 2014 result of the LNE-LNHB (France) and the 2022 result of the IRA (Switzerland)

Main text Since 2000, 7 laboratories have submitted 7 samples of 177 Lu to the International Reference System (SIR) for activity comparison at the Bureau International des Poids et Mesures (BIPM), with comparison identifier BIPM.RI(II)-K1.Lu-177. Recently, the IFIN-HH (Romania), the LNE-LNHB (France) and the IRA (Switzerland) participated in the comparison. The degrees of equivalence between each equivalent activity measured in the SIR or linked to the SIR from the CCRI(II)-K2.Lu-177 comparison have been calculated. The results are given in the form of a table and a graphical representation is also displayed. 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 https://www.bipm.org/kcdb/ . 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).