Atomic and nuclear properties of krypton gas (Kr)
QuantityValueUnits ValueUnits
Atomic number 36     
Atomic mass 83.798(2) g mole-1   
Specific gravity (20° C, 1 atm) 3.486E-03 g cm-3   
Mean excitation energy 352.0 eV   
Minimum ionization 1.357 MeV g-1cm2 4.731E-03 MeV cm-1
Nuclear collision length 90.0 g cm-2 2.581E+04 cm
Nuclear interaction length 149.4 g cm-2 4.287E+04 cm
Pion collision length 114.8 g cm-2 3.293E+04 cm
Pion interaction length 177.6 g cm-2 5.097E+04 cm
Radiation length 11.37 g cm-2 3263. cm
Critical energy 18.61 MeV (for e-) 18.06 MeV (for e+)
Molière radius 12.96 g cm-2 3718. cm
Plasma energy ωp 1.12 eV   
Muon critical energy 324. GeV   
Melting point 115.8 K -157.4 C
Boiling point @ 1 atm 119.9 K -153.2 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