Atomic and nuclear properties of boron (B)
QuantityValueUnits ValueUnits
Atomic number 5     
Atomic mass 10.81(7) g mole-1   
Specific gravity 2.370 g cm-3   
Mean excitation energy 76.0 eV   
Minimum ionization 1.623 MeV g-1cm2 3.847 MeV cm-1
Nuclear collision length 58.0 g cm-2 24.47 cm
Nuclear interaction length 83.3 g cm-2 35.16 cm
Pion collision length 85.2 g cm-2 35.96 cm
Pion interaction length 115.5 g cm-2 48.75 cm
Radiation length 52.68 g cm-2 22.23 cm
Critical energy 93.94 MeV (for e-) 91.40 MeV (for e+)
Molière radius 11.89 g cm-2 5.018 cm
Plasma energy ωp 30.17 eV   
Muon critical energy 1170. 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 via WIKIPEDIA
x ray mass attenuation coefficients from NIST