Quantity | Value | Units | Value | Units |
Atomic number | 89 | |||
Atomic mass | [227.02775(2)] | g mole-1 | ||
Specific gravity | 10.07 | g cm-3 | ||
Mean excitation energy | 841.0 | eV | ||
Minimum ionization | 1.112 | MeV g-1cm2 | 11.19 | MeV cm-1 |
Nuclear collision length | 117.0 | g cm-2 | 11.62 | cm |
Nuclear interaction length | 205.8 | g cm-2 | 20.43 | cm |
Pion collision length | 140.1 | g cm-2 | 13.91 | cm |
Pion interaction length | 232.1 | g cm-2 | 23.05 | cm |
Radiation length | 6.06 | g cm-2 | 0.6016 | cm |
Critical energy | 7.00 | MeV (for e-) | 6.75 | MeV (for e+) |
Molière radius | 18.34 | g cm-2 | 1.821 | cm |
Plasma energy ℏωp | 57.25 | eV | ||
Muon critical energy | 134. | GeV |