An international comparison on radioactivity measurements of 134 Cs was carried out in 2005 between the NMIJ/AIST, LNE-LNHB, INER and the VNIIM, identified as the APMP.RI(II)-K2.Cs-134 comparison. The original solution was prepared by the NMIJ and sent to the BIPM/SIR and eleven other institutes. The results were in agreement, using the half life value of 753.1 days (2.062 y) recommended for this study. These results will be linked to the BIPM.RI(II)-K1.Cs-134 comparison in due course to provide degrees of equivalence for the APMP participants.
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