Comparison of 99mTc activity measurements at the KRISS using the new SIRTI of the BIPM

In 2010, a comparison of activity measurements of 99mTc was carried out at the KRISS using the BIPM's Transfer Instrument of the International Reference System (SIRTI). The transfer instrument and the KRISS coincidence measurement method are briefly described. The degrees of equivalence with the key comparison reference value and between the present KRISS result and the earlier participants in the SIRTI and SIR comparisons have been evaluated. World-wide consistency of activity measurements of 99mTc is demonstrated.