Atomic and nuclear properties of materials:
Berkelium (Bk)
Atomic number 97  
Atomic mass [247.07031(4)] g mole-1
Density ?? g cm-3
Mean excitation energy 952.0 eV
Minimum ionization 1.106 MeV g-1cm2
Nuclear collision length 119.9 g cm-2
Nuclear interaction length 211.6 g cm-2
Pion collision length 142.7 g cm-2
Pion interaction length 237.8 g cm-2
Radiation length 5.69 g cm-2
Critical energy 6.59 MeV (for e-)
Molière radius 18.32 g cm-2
Plasma energy 67.56 eV
Muon critical energy 125. GeV
Melting point 1269. K
For muons, dE/dx = a(E) + b(E) E. Tables of b(E): PS PDF TEXT
Table of muon dE/dx and Range: PS PDF TEXT
Explanation of some entries
Note: Since there is no stable isotope, [atomic mass] is that of the longest-lived known isotope as of Jan 2007.
Table of isotopes Warning: may not be current