element | K absorption limit energy (E/keV) | Kα characteristic energy (E/keV) |
Mg | 1.303 | 1.254 |
Al | 1.559 | 1.487 |
Si | 1.838 | 1.740 |
Cu | 8.980 | 8.047 |
Zn | 9.660 | 8.638 |