Update of the BIPM comparison BIPM.RI(II)-K1.Ho-166m activity measurements of the radionuclide ^166mHo for the PTB (Germany), with linked results for the EURAMET.RI(II)-K2.Ho-166m comparison

The PTB submitted directly to the SIR one ampoule of ^166mHo prepared from a dilution of the solution distributed to four laboratories participating in the EURAMET.RI(II)-K2.Ho-166m comparison in 2013. No attempt to evaluate a new KCRV has been made and the usual procedure was applied to link the results of the comparison to the usual SIR entries through the PTB. One NMI used this K2 comparison to update its previous degree of equivalence older than 20 years. The degrees of equivalence between each equivalent activity measured in the International Reference System (SIR) and the KCRV have been calculated and the results are given in the form of a table for the four remaining laboratories in the BIPM.RI(II)-K1.Ho-166m comparison, the six laboratories in the regional comparison APMP.RI(II)-K2.Ho-166m and the four laboratories in the regional EURAMET.RI(II)-K2.Ho-166m comparison. A graphical presentation is also given. (authors)