Isotopes of krypton

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

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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. For further information about radioisotopes see Jonghwa Chang's (Korea Atomic Energy Research Institute) Table of the Nuclides
  3. 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]

NMR Properties of krypton

Common reference compound: krypton gas.

Table of NMR-active nucleus propeties of krypton
  Isotope 1 Isotope 2 Isotope 3
Isotope 83Kr 85Kr
Natural abundance /% 11.5
Spin (I) 9/2
Frequency relative to 1H = 100 (MHz) (3.8476)
Receptivity, DP, relative to 1H = 1.00 0.000219
Receptivity, DC, relative to 13C = 1.00 1.25
Magnetogyric ratio, γ (107 rad T-1 s-1) -1.03310
Magnetic moment, μ (μN) -1.07311
Nuclear quadrupole moment, Q/millibarn 259(1) 507(3)
Line width factor, 1056l (m4) 0.0047

References

  1. R.K. Harris in Encyclopedia of Nuclear Magnetic Resonance, D.M. Granty and R.K. Harris, (eds.), vol. 5, John Wiley & Sons, Chichester, UK, 1996. I am grateful to Professor Robin Harris (University of Durham, UK) who provided much of the NMR data, which are copyright 1996 IUPAC, adapted from his contribution contained within this reference.
  2. J. Mason in Multinuclear NMR, Plenum Press, New York, USA, 1987. Where given, data for certain radioactive nuclei are from this reference.
  3. P. Pyykkö, Mol. Phys., 2008, 106, 1965-1974.
  4. P. Pyykkö, Mol. Phys., 2001, 99, 1617-1629.
  5. P. Pyykkö, Z. Naturforsch., 1992, 47a, 189. I am grateful to Professor Pekka Pyykkö (University of Helsinki, Finland) who provided the nuclear quadrupole moment data in this and the following two references.
  6. D.R. Lide, (ed.), CRC Handbook of Chemistry and Physics 1999-2000 : A Ready-Reference Book of Chemical and Physical Data (CRC Handbook of Chemistry and Physics, CRC Press, Boca Raton, Florida, USA, 79th edition, 1998.
  7. P. Pyykkö, personal communication, 1998, 204, 2008, 2010.
  8. The isotopic abundances are extracted from the naturally occurring isotopes section within WebElements.

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krypton atomic number