F/O F source C source O yield [%]* δ18O [‰]
NBS28 SWy-1 NBS28 9.6 ‰† SWy-1 18.6 ‰‡
2 NaF Graphite 54–64 82–91 N.D. 16–22
6 NaF Graphite 98.2–99.3 90.0–91.6 10.8 ±0.29 17.8 ±0.18
2 NaF Ni/C 108.5–112.2 108.8–110.9 10.0 ±0.23 16.7 ±0.07
*O yield was calculated based on CO peak area normalized by oxygen mass and the assumption of the average oxygen yields of IAEA-601 and 602 are 92.8% 24. †, ‡Accepted reference values 16, 4.