BIPM comparison BIPM.RI(II)-K1.Cr-51 of the activity measurements of the radionuclide 51Cr

Since 1977, eight national metrology institutes and three other laboratories have submitted 26 samples of known activity of Cr-51 to the International Reference System (SIR) for activity comparison at the Bureau International des Poids et Mesures. The activities ranged from about 3 MBq to 90 MBq. The degrees of equivalence between each equivalent activity measured in the SIR and the key comparison reference value (KCRV) have been calculated and the results are given in the form of a matrix for nine laboratories. A graphical presentation is also given.