Since 1976, 28 laboratories have submitted 72 samples of ⁶⁰Co 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.Co-60. Recently, the PTB (Germany) and the TAEK (Turkey) participated in the comparison and the key comparison reference value (KCRV) has been updated to include the PTB result. The degrees of equivalence between each equivalent activity measured in the SIR and the updated KCRV 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 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).

自1976年以来，已有28个实验室向国际参考系统（SPM）提交了72种⁶⁰ Co样品，供国际参考物质与计量局（BIPM）进行活性比较，比较标识符为BIPM.RI（II）-K1.Co-60。 。最近，PTB（德国）和TAEK（土耳其）参与了比较，并且关键比较参考值（KCRV）已更新为包括PTB结果。已计算出在SIR中测得的每个等效活动与更新的KCRV之间的等效程度，并以表格的形式给出了结果。还给出了图形表示。

要获得本文的正文，请单击“最终报告”。请注意，此文本显示在BIPM密钥比较数据库kcdb.bipm.org/的附录B中。

根据CIPM相互认可安排（CIPM MRA）的规定，最终报告已由CCRI进行同行评审并批准发布。