Table 5 Estimated results of the U-content for the CRM 149 sample (treated as unknown) spiked with CRM 112A original stock (SP1) and diluted spike mixtures (SP2, SP3, SP4)
From: Expanded uncertainty modeling of the uranium isotope dilution standards
Spike | C112A-1 (SP1) | C112A-2 (SP2) | C112A-3 (SP3) | C112A-4 (SP4) | ||||
|---|---|---|---|---|---|---|---|---|
Sample | CRM 149-1 (SA1) | CRM 149-1 (SA2) | CRM 149-1 (SA3) | CRM 149-1 (SA3) | ||||
Mixture number | SP 1-1 | SP 1-2 | SP 2-1 | SP 2-2 | SP 3-1 | SP 3-2 | SP 4-1 | SP 4-2 |
Corr. R5/8 mixa | 3.5094 | 1.8525 | 6.8036 | 6.7971 | 10.6457 | 10.6463 | 14.2038 | 14.1995 |
CU unkb mol U g−1 | 2.1874E-05 | 2.1873E-05 | 2.18848E-05 | 2.18843E-05 | 2.1876E-05 | 2.1886E-05 | 2.186E-05 | 2.188E-05 |
CU unk gU/g | 0.005145 | 0.005145 | 0.005147 | 0.005147 | 0.005145 | 0.005148 | 0.005141 | 0.005145 |
RD%c | − 0.004 | − 0.006 | 0.046 | 0.043 | 0.007 | 0.063 | − 0.073 | 0.011 |