Atomic and nuclear properties of ruthenium (Ru)
QuantityValueUnits ValueUnits
Atomic number 44     
Atomic mass 101.07(2) g mol-1   
Density 12.41 g cm-3   
Mean excitation energy 441.0 eV   
Minimum ionization 1.307 MeV g-1cm2 16.22 MeV cm-1
Nuclear interaction length 158.4 g cm-2 12.76 cm
Nuclear collision length 94.3 g cm-2 7.596 cm
Pion interaction length 186.0 g cm-2 14.99 cm
Pion collision length 118.8 g cm-2 9.574 cm
Radiation length 9.48 g cm-2 0.7641 cm
Critical energy 13.12 MeV (for e-) 12.68 MeV (for e+)
Muon critical energy 225. GeV   
Molière radius 15.32 g cm-2 1.235 cm
Plasma energy ωp 66.98 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
Table of isotopes via WIKIPEDIA
x ray mass attenuation coefficients from NIST