Key comparison BIPM.RI(I)-K1 of the air-kerma standards of VSL, The Netherlands, and the BIPM in 60Co gamma radiation

Abstract

A key comparison of the standards for air kerma of VSL, Dutch Metrology Institute, The Netherlands (VSL) and of the Bureau International des Poids et Mesures (BIPM) was carried out in the 60Co radiation beam of the BIPM in December 2017. The comparison result, based on the calibration coefficients for two transfer chambers and expressed as a ratio of the VSL and the BIPM standards for air kerma, is 0.9963 with a combined standard uncertainty of 2.1 x 10-3. The results are analysed and presented in terms of degrees of equivalence, suitable for entry in the BIPM key comparison database. KEY WORDS FOR SEARCH Comparison, radiation dosimetry, air kerma, 60Co Main text 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).