. Author manuscript; available in PMC: 2021 Jul 9.

Published in final edited form as: J Radioanal Nucl Chem. 2020;324(1):10.1007/s10967-020-07075-y. doi: 10.1007/s10967-020-07075-y

Table 7.

Uncertainty budget summarizing the significant components contributing to the combined standard uncertainty (R_Comb) for characterized plutonium isotope amount ratios of the ²⁴⁴Pu Spike

Uncertainty component	Description	Assessment type	Relative standard uncertainty (%) of contributing components
Uncertainty component	Description	Assessment type	n(²³⁹Pu)/n(²⁴⁴Pu)	n(²⁴⁰Pu)/n(²⁴⁴Pu)	n(²⁴¹Pu)/n(²⁴⁴Pu)	n(²⁴²Pu)/n(²⁴⁴Pu)
R_VarW	Standard uncertainty of within-laboratory measurement variability	A	0.30	0.15	1.04	0.16
R_VarB	Standard uncertainty of between-laboratory measurement variability	A	1.3	0.47	10.3	0.46
R_CRM	Average standard uncertainty derived from certificate values for mass spectrometry calibration CRMs	B	0.06	0.06	0.06	0.06
R_Corr	Estimated standard uncertainty of mass spectrometry measurements	B	0.28	0.09	1.07	0.15
δ_Decay	Standard uncertainty associated with decay corrections for measured values	B	0.00	0.00	0.03	0.00
R_Comb	Relative combined standard uncertainty (%) k = 1		1.5	0.53	10.4	0.51

The relative combined standard uncertainty (bold) is calculated from the listed uncertainty components summed in quadrature Assessment Type “A” denotes evaluation by statistical methods; “B” denotes evaluation by other methods