Atomic and nuclear properties of berkelium (Bk)
QuantityValueUnits ValueUnits
Atomic number 97     
Atomic mass [247.07031(4)] g mole-1   
Specific gravity 9.860 g cm-3   
Mean excitation energy 952.0 eV   
Minimum ionization 1.085 MeV g-1cm2 10.69 MeV cm-1
Nuclear collision length 119.9 g cm-2 12.16 cm
Nuclear interaction length 211.6 g cm-2 21.46 cm
Pion collision length 142.7 g cm-2 14.48 cm
Pion interaction length 237.8 g cm-2 24.11 cm
Radiation length 5.69 g cm-2 0.5772 cm
Critical energy 6.10 MeV (for e-) 5.87 MeV (for e+)
Molière radius 19.79 g cm-2 2.007 cm
Plasma energy ωp 56.70 eV   
Muon critical energy 116. GeV   
Melting point 1259. K 986.0 C
For muons, dE/dx = a(E) + b(E) E. Tables of b(E): PDF TEXT
Table of muon dE/dx and Range: PDF TEXT
Explanation of some entries
Note: Since there is no stable isotope, [atomic mass] is that of the longest-lived isotope known as of Jun 2017.
Table of isotopes via WIKIPEDIA