Isotopes of krypton

Isotope data
krypton symbol icon

Krypton isotopes are used in various medical and scientific applications. Kr-82 is used for the production of Rb-81/Kr-81m generators. Many of the stable isotopes of Krypton are used in the study of the pulmonary system. Kr-78 can be used for the production of Br-75 although production of Br-75 via Se-76 is more common. Kr-86 has been used to define the standard measure of length: 1 meter is exactly 1,650,763.73 wavelengths of this isotope. Krypton isotopes can be obtained from Trace Sciences International.

Naturally occurring isotopes

This table shows information about naturally occuring isotopes, their atomic masses, their natural abundances, their nuclear spins, and their magnetic moments. Further data for radioisotopes (radioactive isotopes) of krypton are listed (including any which occur naturally) below.
Isotope Atomic mass (ma/u) Natural abundance (atom %) Nuclear spin (I) Magnetic moment (μ/μN)
78Kr 77.920396 (9) 0.35 (1) 0
80Kr 79.916380 (9) 2.28 (6) 0
82Kr 81.913482 (6) 11.58 (14) 0
83Kr 82.914135 (4) 11.49 (6) 9/2 -0.970669
84Kr 83.911507 (4) 57.00 (4) 0
86Kr 85.910616 (5) 17.30 (22) 0

Isotopic abundances of Kr
In the above picture, the most intense ion is set to 100% since this corresponds best to the output from a mass spectrometer. This is not to be confused with the relative percentage isotope abundances which total 100% for all the naturally occurring isotopes.

Radiosotope data

Further data for naturally occuring isotopes of krypton are listed above. This table gives information about some radiosotopes of krypton, their masses, their half-lives, their modes of decay, their nuclear spins, and their nuclear magnetic moments.
Isotope Mass Half-life Mode of decay Nuclear spin Nuclear magnetic moment
74Kr 73.9333 11.5 m EC to 74Br 0
75Kr 74.93104 4.3 m EC to 75Br
76Kr 75.92595 14.8 h EC to 76Br 0
77Kr 76.92467 1.24 h EC to 77Br 5/2
79Kr 78.920083 1.455 d EC to 79Br 1/2
81Kr 80.916593 210000 y EC to 81Br 7/2
85Kr 84.912530 10.73 y β- to 85Rb 9/2 1.005
87Kr 86.913359 1.27 h β- to 87Rb 5/2 -1.018
88Kr 87.91445 2.84 h β- to 88Rb 0
89Kr 88.91764 3.15 m β- to 89Rb 5/2

Sheffield ChemPuter isotope pattern calculator

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References

  1. Naturally occurring isotope abundances: Commission on Atomic Weights and Isotopic Abundances report for the International Union of Pure and Applied Chemistry in Isotopic Compositions of the Elements 1989, Pure and Applied Chemistry, 1998, 70, 217. [Copyright 1998 IUPAC]
  2. Masses, nuclear spins, and magnetic moments: I. Mills, T. Cvitas, K. Homann, N. Kallay, and K. Kuchitsu in Quantities, Units and Symbols in Physical Chemistry, Blackwell Scientific Publications, Oxford, UK, 1988. [Copyright 1988 IUPAC]
  3. For further information about radioisotopes see Jonghwa Chang's (Korea Atomic Energy Research Institute) Table of the Nuclides

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krypton atomic number