Comparison of the standards for absorbed dose to water of the BEV, Austria, and the BIPM for 60Co gamma radiation

Abstract

A comparison of the standards for absorbed dose to water of the Bundesamt für Eich- und Vermessungswesen (BEV), Austria, and of the Bureau International des Poids et Mesures (BIPM) was carried out in the 60Co radiation beam of the BIPM in March 2009 under the auspices of the key comparison BIPM.RI(I)-K4. The comparison result, based on the calibration coefficients measured for two transfer standards and expressed as a ratio of the BEV and the BIPM standards for absorbed dose to water, is 0.9996(37). This result replaces the 1994 BEV value of 0.9990(43) in this key comparison. The degrees of equivalence between the BEV and the other participants in this comparison have been calculated and the results are given in the form of a matrix for the ten national metrology institutes (NMIs) that have published results in this ongoing comparison for absorbed dose to water. A graphical presentation is also given.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 Section I, according to the provisions of the CIPM Mutual Recognition Arrangement (MRA).