Table 6.
Corrected isotopic ratios for the reference sample
| Mass spectrometer | Determination number | Cr50/Cr52b | Cr53/Cr52b | Cr54/Cr52b |
|---|---|---|---|---|
| MS-2 | 1 | 0.051880 | 0.113416 | 0.028218 |
| 2 | .051898 | .113415 | .028209 | |
| MS-4 | 3 | .051828 | .113319 | .028239 |
| 4 | .051830 | .113393 | .028220 | |
| Mean | 0.051859 | 0.113386 | 0.028222 | |
| Overall limit of errora | ±0.000100 | ±0.000145 | ±0.000059 | |
| Uncertainty components: | ||||
| 95 percent confidence limits on ratio determination | ± 0.000029 | ± 0.000032 | ± 0.000019 | |
| Bounds due to possible systematic error in correction factor | ± 0.000039 | ± 0.000043 | ± 0.000022 | |
| Bounds due to possible systematic error in chemical analysis | ± 0.000007 | ±0.000015 | ± 0.000004 | |
| Bounds due to possible systematic error in attenuation calibration | ± 0.000025 | ± 0.000055 | ± 0.000014 | |
a
The overall limit of error is the sum of the 95 percent 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.