Atomic and nuclear properties of thallium (Tl)
QuantityValueUnits ValueUnits
Atomic number 81     
Atomic mass 204.3833(2) g mole-1   
Specific gravity 11.72 g cm-3   
Mean excitation energy 810.0 eV   
Minimum ionization 1.125 MeV g-1cm2 13.19 MeV cm-1
Nuclear collision length 113.6 g cm-2 9.696 cm
Nuclear interaction length 198.7 g cm-2 16.96 cm
Pion collision length 136.9 g cm-2 11.68 cm
Pion interaction length 225.3 g cm-2 19.22 cm
Radiation length 6.42 g cm-2 0.5477 cm
Critical energy 7.50 MeV (for e-) 7.23 MeV (for e+)
Molière radius 18.15 g cm-2 1.549 cm
Plasma energy ωp 62.10 eV   
Muon critical energy 142. GeV   
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 Warning: may not be current
x ray mass attenuation coefficients