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Table 2 CRM 112A Spike proportions with different diluted spike solutions (SP1, SP2, SP3, SP4)

From: Expanded uncertainty modeling of the uranium isotope dilution standards

  CRM 112 A-1 (SP1) CRM 112 A-2 (SP2) CRM 112 A-3 (SP3) CRM 112 A-4 (SP4)
mgU/g (spike) 4.402361 0.88090847 0.542278906 0.130669117
proportions (g) 2.1 2.06 2.06 2.05
Spike mg U 9.2449581 1.814671448 1.117094546 0.267871691
Spike to sample portions (ca.) 1:4 1:2 1:3 1:2
  1. Due to the volumetric usage of the solutions, amounts may vary. For the abbreviations, see Table 1