| Abstract | In 2017, comparisons of activity measurements of ¹⁸F, ⁶⁴Cu, ⁹⁹ᵐTc and ¹¹C using the Transfer Instrument of the International Reference System (SIRTI) took place at the National Research Council of Canada (NRC, Canada). Ampoules containing ¹⁸F, ⁶⁴Cu, ⁹⁹ᵐTc and ¹¹C solutions were measured in the SIRTI for about 3 half-lives (10 half-lives for ¹¹C). The NRC standardized the activity in the ampoules by 4π(PC)β−γ anti-coincidence measurements (CIEMAT/NIST liquid scintillation counting for ¹¹C). The comparisons, identifiers BIPM.RI(II)-K4.F-18, BIPM.RI(II)-K4.Cu-64 and BIPM.RI(II)- K4.Tc-99m are linked to the corresponding BIPM.RI(II)-K1.F-18, BIPM.RI(II)-K1.Cu-64 and BIPM.RI(II)-K1.Tc-99m comparisons. The BIPM.RI(II)-K1 ¹⁸F and ⁹⁹ᵐTc key comparison reference values have been updated to include the latest BIPM.RI(II)-K4 linked results and degrees of equivalence for those three comparisons have been evaluated. |
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