Update of the BIPM comparison BIPM.RI(II)-K1.Ac-225 of activity measurements of the radionuclide ²²⁵Ac to include the 2021 result of the POLATOM (Poland)

Abstract

Main text Since 2019, 2 laboratories have submitted 2 samples of 225Ac 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.Ac-225. Recently, the POLATOM (Poland) participated in the comparison and a key comparison reference value (KCRV) has been calculated. For the first time, the degrees of equivalence between each equivalent activity measured in the SIR have been calculated and the results are given in the form of a table. A graphical presentation is also given. 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).

News from the BIPM laboratories—2023

“…The discussion of the 177 Lu results at the CCRI section II: Measurement of radionuclides (CCRI(II)) triggered the organization of a related EURAMET comparison and further SIR participations are expected in the near future. In 2023, eight SIR comparison reports were produced and eight were published [17][18][19][20][21][22][23][24]. These reports now include machinereadable data [25], with this format having been applied to the whole SIR database allowing a meta-analysis of the long-term robustness of the SIR over decades of operation [26].…”