Key comparison BIPM.RI(I)-K4 of the absorbed dose to water standards of the NIM, China and the BIPM in 60Co gamma radiation

Abstract

Main text A key comparison of the standards for absorbed dose to water of the National Institute of Metrology (NIM), China, and the Bureau International des Poids et Mesures (BIPM) was carried out in the 60Co radiation beam of the BIPM in December 2021. The comparison result, based on the calibration coefficients for four transfer standards and evaluated as a ratio of the NIM and the BIPM standards for absorbed dose to water, is 1.0027 with a combined standard uncertainty of 3.6 parts in 103. The results are analysed and presented in terms of degrees of equivalence, suitable for entry in the BIPM key comparison database. 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).