Atomic and nuclear properties of materials:
Calcium (Ca)
QuantityValueUnits ValueUnits
Atomic number 20     
Atomic mass 40.078(4) g mole-1   
Density 1.55 g cm-3   
Mean excitation energy 191.0 eV   
Minimum ionization 1.655 MeV g-1cm2 2.566 MeV cm-1
Nuclear collision length 75.8 g cm-2 48.89 cm
Nuclear interaction length 119.8 g cm-2 77.31 cm
Pion collision length 101.4 g cm-2 65.44 cm
Pion interaction length 148.8 g cm-2 96.02 cm
Radiation length 16.14 g cm-2 10.42 cm
Critical energy 29.56 MeV (for e-) 28.71 MeV (for e+)
Molière radius 11.58 g cm-2 7.471 cm
Plasma energy 25.34 eV   
Muon critical energy 447. 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