Atomic and nuclear properties of materials:
Ruthenium (Ru)
QuantityValueUnits ValueUnits
Atomic number 44     
Atomic mass 101.07(2) g mole-1   
Density 12.4 g cm-3   
Mean excitation energy 441.0 eV   
Minimum ionization 1.307 MeV g-1cm2 16.22 MeV cm-1
Nuclear collision length 94.3 g cm-2 7.596 cm
Nuclear interaction length 158.4 g cm-2 12.76 cm
Pion collision length 118.8 g cm-2 9.574 cm
Pion interaction length 186.3 g cm-2 15.01 cm
Radiation length 9.48 g cm-2 0.7641 cm
Critical energy 13.12 MeV (for e-) 12.68 MeV (for e+)
Molière radius 15.32 g cm-2 1.235 cm
Plasma energy 66.98 eV   
Muon critical energy 225. GeV   
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
Table of isotopes Warning: may not be current
x ray mass attenuation coefficients