Atomic and nuclear properties of tantalum (Ta)
QuantityValueUnits ValueUnits
Atomic number 73     
Atomic mass 180.94788(2) g mol-1   
Density 16.65 g cm-3   
Mean excitation energy 718.0 eV   
Minimum ionization 1.149 MeV g-1cm2 19.14 MeV cm-1
Nuclear interaction length 191.0 g cm-2 11.47 cm
Nuclear collision length 109.9 g cm-2 6.599 cm
Pion interaction length 217.5 g cm-2 13.06 cm
Pion collision length 133.4 g cm-2 8.011 cm
Radiation length 6.82 g cm-2 0.4094 cm
Critical energy 8.09 MeV (for e-) 7.79 MeV (for e+)
Muon critical energy 152. GeV   
Molière radius 17.88 g cm-2 1.073 cm
Plasma energy ωp 74.69 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