. 2021 Oct 12;8:712374. doi: 10.3389/fmed.2021.712374

Table 3.

Comparison of the isotope ratios obtained by ICP-MS for natural and proton-irradiated Er₂O₃ samples.

	¹⁷⁰Er/¹⁶⁷Er	¹⁶⁸Er/¹⁶⁷Er	¹⁶⁶Er/¹⁶⁷Er	¹⁶⁴Er/¹⁶⁷Er	¹⁶²Er/¹⁶⁷Er
^natEr₂O₃^†	0.65197 (25)	1.17968 (14)	1.46500 (26)	0.070007 (21)	0.006078 (31)
Irr. ^natEr₂O₃^*†	0.65200 (30)	1.17969 (17)	1.46503 (27)	0.069994 (26)	0.006074 (32)
Irr. ^natEr₂O₃^**†	0.65200 (25)	1.17969 (15)	1.46503 (27)	0.069994 (22)	0.006074 (32)

Errors given as 95% confidence interval (CI).

^†

From (49), 95% CI recalculated using N = 20.

^*†

Using relation of mass discrimination factors for Er and admixed Lu from analyses of natural Er₂O₃ analyses and including uncertainties from (49).

^**†

Using measured mass discrimination factor from¹⁷⁰Er/¹⁶⁶Er and including uncertainties from (49).