Isotopes of krypton

There are 34 known isotopes of krypton (36Kr) with atomic mass numbers from 69 through 102. Naturally occurring krypton is made of five stable isotopes and one (78
Kr
) which is slightly radioactive with an extremely long half-life, plus traces of radioisotopes that are produced by cosmic rays in the atmosphere.

Isotopes of krypton (36Kr)
Main isotopes Decay
abun­dance half-life (t1/2) mode pro­duct
78Kr 0.360% 9.2×1021 y εε 78Se
79Kr synth 35 h ε 79Br
β+ 79Br
γ
80Kr 2.29% stable
81Kr trace 2.3×105 y ε 81Br
81mKr synth 13.10 s IT 81Kr
ε 81Br
82Kr 11.6% stable
83Kr 11.5% stable
84Kr 57.0% stable
85Kr trace 11 y β 85Rb
86Kr 17.3% stable
Standard atomic weight Ar°(Kr)
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