Skip to main content

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
  1. aMass fractionation corrected values used for the mixture ratios from Hasozbek et al. (2013) and Mathew and Hasözbek (2016)
  2. bSee Certified Reference Material (CRM) certificates issued by NBL
  3. cRD% for mixture simulations for Cunknown is evaluated from the certified value
  4. For the abbreviations, see Table 1 and 6