Table 1. Isotopic composition and determined impurity content of 162Er provided by TraceScience as measured by ICP-MS, ICP-OES and NAA.
The original data provided by the supplier is also given.
| Analysis PSI | TraceScience CoA | |
|---|---|---|
| isotope | isotopic composition1 [%] | |
| Er-162 | 26.1(4) | 25.1(14) |
| Er-164 | 6.0(2) | 6.87 |
| Er-166 | 30.1(7) | 29.75 |
| Er-167 | 15.5(4) | 15.67 |
| Er-168 | 15.6(6) | 15.63 |
| Er-170 | 6.7(2) | 6.98 |
| impurities | concentration relative to Er [at. ppm] | |
| Eu | 15(1)§ 1,3 | / |
| Gd | 29(2)1 | 1000 |
| Tb | 7(1)1 | / |
| Dy | 5160(280)*,2 | 5400 |
| Ho | 235(25)1, 3 | / |
| Tm | 360(30)1 | 900 |
| Yb | 1530(70)*,2 | / |
| Lu | 265(10)§ 1,3 | / |
1 –measured by ICP-MS
2 –measured by ICP-OES
3 –measured by NAA
§ - average value of two independent measurement techniques
*—the isotopic composition of Dy and Yb is non-natural, see Table 2; values denoted by “/” were not stated