Table 7.
Summary calculations of the atomic weight of chromium in the reference sample
| Value | Overall limit of errora | Uncertainty components | ||||
|---|---|---|---|---|---|---|
| 95 percent confidence limits on ratio determination | Possible systematic error in calibration factor | Possible systematic error in chemical analyses | Possible systematic error in attenuation calibration | |||
| Atomic weight | 51.99612 | ± 0.00033 | ± 0.000063 | ± 0.000135 | ± 0.000025 | ± 0.000108 |
| Nuclidic masses [61] | ||||||
| (C12= 12) | ||||||
| Cr50 | 49.9460545 | ± 0.0000037 | ||||
| Cr52 | 51.9405131 | ±.0000032 | ||||
| Cr53 | 52.9406527 | ± .0000032 | ||||
| Cr54 | 53.9388815 | ± .0000040 | ||||
| Atom percent: | ||||||
| Cr50 | 4.3452 | ± 0.0085 | ± 0.00233 | ± 0.00350 | ±0.00061 | ± 0.0021 |
| Cr52 | 83.7895 | ± .0117 | ± .00310 | ± .00172 | ± .00030 | ±.0066 |
| Cr53 | 9.5006 | ±.0110 | ± .00244 | ± .00334 | ± .00058 | ±.0046 |
| Cr54 | 2.3647 | ± .0048 | ± .00154 | ±.00173 | ± .00030 | ±.0012 |
| Isotopic ratiosb | ||||||
| 50/52 | 0.051859 | ±0.000100 | ± 0.000029 | ± 0.000039 | ± 0.000007 | ± 0.000025 |
| 53/52 | .113386 | ± .000145 | ± .000032 | ± .000043 | ±.000015 | ± .000055 |
| 54/52 | .028222 | ± .000059 | ± .000019 | ± .000022 | ± .000004 | ± .000014 |
a
The overall limit of error is the sum of the 95 percent confidence limits for the ratio determinations and the terms covering effects of known sources of possible systematic-error.
b
Each of these ratios is the average of 4 ratios from different runs.