Atomic and nuclear properties of dubnium (Db)
Atomic number 105  
Atomic mass [268.12567(4)] g mol-1
Density ?? g cm-3
Mean excitation energy 1061.0 eV
Minimum ionization 1.088 MeV g-1cm2
Nuclear interaction length 217.5 g cm-2
Nuclear collision length 122.7 g cm-2
Pion interaction length 243.1 g cm-2
Pion collision length 145.4 g cm-2
Radiation length 5.40 g cm-2
Critical energy 6.16 MeV (for e-)
Muon critical energy 118. GeV
Molière radius 18.60 g cm-2
Plasma energy ωp 67.47 eV
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.
Note: Density 14.0 g/cm3 and Ieff = 1061 eV assumed in calculating critical energies and dE/dx.
Table of isotopes via WIKIPEDIA