Comparison of the standards for absorbed dose to water of the BEV, Austria, and the BIPM for⁶⁰Co gamma radiation

A direct comparison of the standards for air kerma of the Bundesamt fur Eich- und Vermessungswesen (BEV), Austria, and of the Bureau International des Poids et Mesures (BIPM) was carried out in the Cs-137 radiation beam of the BIPM in March 2009. The result, expressed as ratios of the BEV and the BIPM standards for air kerma, is 1.0041 with a combined standard uncertainty of 3.1 x 10(-3). The result of the earlier direct comparison in 137Cs. rays, made in 1995, was 0.9961(28); taking into account the changes made recently to both standards, the 1995 result becomes 1.0035 (24), in agreement with the present comparison result.