| Quantity | Value | Units | Value | Units |
| <Z/A> | 0.49929 | |||
| Specific gravity | 3.30 | g cm-3 | ||
| Minimum ionization | 1.650 | MeV g-1cm2 | 5.445 | MeV cm-1 |
| Nuclear collision length | 71.0 | g cm-2 | 21.52 | cm |
| Nuclear interaction length | 109.5 | g cm-2 | 33.20 | cm |
| Radiation length | 19.01 | g cm-2 | 5.761 | cm |
| Critical energy | 34.21 | MeV (for e-) | 33.21 | MeV (for e+) |
| Molière radius | 11.78 | g cm-2 | 3.571 | cm |
Plasma energy ![]() |
36.99 | eV | ||
| Muon critical energy | 507. | GeV |
| Elem | Z | Atomic frac* | Mass frac* |
| 8 | |||
| 20 | |||
| * calculated from mass fraction data. | |||