Atomic and nuclear properties of materials:
Selenium (Se)
QuantityValueUnits ValueUnits
Atomic number 34     
Atomic mass 78.96(3) g mole-1   
Density 4.50 g cm-3   
Mean excitation energy 348.0 eV   
Minimum ionization 1.343 MeV g-1cm2 6.044 MeV cm-1
Nuclear collision length 88.7 g cm-2 19.70 cm
Nuclear interaction length 146.7 g cm-2 32.60 cm
Pion collision length 113.5 g cm-2 25.23 cm
Pion interaction length 175.0 g cm-2 38.90 cm
Radiation length 11.91 g cm-2 2.646 cm
Critical energy 17.33 MeV (for e-) 16.79 MeV (for e+)
Molière radius 14.57 g cm-2 3.237 cm
Plasma energy 40.11 eV   
Muon critical energy 285. 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