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Results of spectrochemical analysis of lead isotope samples
| Quantitative (with standards) determinations of concentrations | |||
|---|---|---|---|
| Element | 206Pb | 208Pb | Estimated limits of detection |
| ppm | ppm | ppm | |
| Ag | < 1 | 15 | < 0.1 |
| Ba | 1 | ||
| Bi | 1 | ||
| Cu | < 1 | < 1 | < 0.1 |
| Hg | < 10 | ||
| Tl | 5 | ||
| Zn | 1 | ||
NOTES: …, not detected; <, less than.
