| Quantity | Value | Units | Value | Units |
| <Z/A> | 0.50526 | |||
| Density | 1.24 | g cm-3 | ||
| Mean excitation energy | 111.9 | eV | ||
| Minimum ionization | 1.753 | MeV g-1cm2 | 2.165 | MeV cm-1 |
| Nuclear collision length | 67.7 | g cm-2 | 54.85 | cm |
| Nuclear interaction length | 102.0 | g cm-2 | 82.57 | cm |
| Pion collision length | 94.5 | g cm-2 | 76.48 | cm |
| Pion interaction length | 133.1 | g cm-2 | 107.8 | cm |
| Radiation length | 22.99 | g cm-2 | 18.61 | cm |
| Critical energy | 44.19 | MeV (for e-) | 42.97 | MeV (for e+) |
| Molière radius | 11.03 | g cm-2 | 8.933 | cm |
Plasma energy ![]() |
22.76 | eV | ||
| Muon critical energy | 628. | GeV |
| Elem | Z | Atomic frac* | Mass frac* |
| 1 | |||
| 6 | |||
| 17 | |||
| * calculated from mass fraction data. | |||