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 |