Atomic and nuclear properties of beryllium (Be)
QuantityValueUnits ValueUnits
Atomic number 4     
Atomic mass 9.0121831(5) g mole-1   
Specific gravity 1.848 g cm-3   
Mean excitation energy 63.7 eV   
Minimum ionization 1.595 MeV g-1cm2 2.947 MeV cm-1
Nuclear collision length 55.3 g cm-2 29.93 cm
Nuclear interaction length 77.8 g cm-2 42.10 cm
Pion collision length 82.4 g cm-2 44.60 cm
Pion interaction length 109.9 g cm-2 59.47 cm
Radiation length 65.19 g cm-2 35.28 cm
Critical energy 113.70 MeV (for e-) 110.68 MeV (for e+)
Molière radius 12.16 g cm-2 6.579 cm
Plasma energy ωp 26.10 eV   
Muon critical energy 1328. GeV   
Melting point 1560. K 1287. C
Boiling point @ 1 atm 2744. K 2471. C
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