CIPM MRA COMPARISON REPORTS

A new indirect key comparison of the standards for air kerma of the Laboratoire National de Métrologie et d'Essais - Laboratoire National Henri Becquerel (LNE-LNHB), France, and the Bureau International des Poids et Mesures (BIPM) was carried out in the ⁶⁰Co radiation beam of the BIPM in June 2026. The comparison result, based on the calibration coefficients for two transfer chambers and evaluated as a ratio of the LNE-LNHB and the BIPM standards for air kerma, is 0.9975 with a combined standard uncertainty of 2.0 parts in 10³. The results are analysed and presented in terms of degrees of equivalence, suitable for entry in the BIPM key comparison database.

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).