BIPM comparison BIPM.RI(II)-K1.Hg-203 of activity measurements of the radionuclide 203Hg

Since 1976, five national metrology institutes (NMIs) and another laboratory have submitted 16 samples of known activity of Hg-203 to the International Reference System (SIR) for activity comparison at the Bureau International des Poids et Mesures. The activities ranged from about 1 MBq to 22 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 the five NMIs. A graphical presentation is also given.