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Table 3 CRM 149 sample proportions to duplicate the sample-spike mixtures (SA1, SA2, SA3, SA4).

From: Expanded uncertainty modeling of the uranium isotope dilution standards

  CRM 149 (SA1) CRM 149 (SA2) CRM 149 (SA3) CRM 149 (SA4)
mgU/g (sample) 5.14015756 5.14015756 5.14015756 5.14015756
proportions (g) 8.28 4.13 6.2 4.1
Sample mg U 42.5605046 21.22885072 31.86897687 21.074646
Sample to spike portions (ca.) 4:1 2:1 3:1 2:1
  1. Due to the volumetric usage of the solutions, amounts may vary. For the abbreviations, see Table 1