Degrees of equivalence for the key comparison BIPM.RI(I)-K2 between national primary standards for low-energy x-rays

Results are presented of comparisons of eleven national primary standards for air kerma with the BIPM primary standard over the range of x-radiation qualities from 10 kV to 50 kV. For each radiation quality, the results are analysed in terms of the degree of equivalence, Di, of each national standard i with respect to the key comparison reference value. The degrees of equivalence, Dij, between each pairing of national standards i and j are also evaluated. These data form the basis of the matrices and graphs of results entered in the BIPM key comparison database for comparison BIPM.RI(I)-K2. Main text. To reach the main text of this paper, click on Summary Report. Note that this text is that which appears in Appendix B of the BIPM key comparison database kcdb.bipm.org/. The summary report has been peer-reviewed and approved for publication by the Consultative Committee for Ionizing Radiation (CCRI), according to the provisions of the Mutual Recognition Arrangement (MRA).