Strontium: isotope data

Strontium has four stable isotopes and two of them have medical applications. Sr-86 is used for the production of the PET isotope Y-86 which is used in dosimetry prior to Y-90 based radioimmunotherapy. Sr-88 is used for the production of Sr-89 which is the active agent in MetastronTM.

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 strontium are listed (including any which occur naturally) below.
Isotope Mass / Da Natural abundance (atom %) Nuclear spin (I) Magnetic moment (μ/μN)
84Sr 83.913430 (4) 0.56 (1) 0
86Sr 85.9092672 (28) 9.86 (1) 0
87Sr 86.9088841 (28) 7.00 (1) 9/2 -1.09283
88Sr 87.9056188 (28) 82.58 (1) 0

In the above, 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 totals 100% for all the naturally occurring isotopes.

Radiosotope data

Further data for naturally occuring isotopes of strontium are listed above. This table gives information about some radiosotopes of strontium, their masses, their half-lives, their modes of decay, their nuclear spins, and their nuclear magnetic moments.
Isotope Mass / Da Half-life Mode of decay Nuclear spin Nuclear magnetic moment
80Sr 79.92453 1.77 h EC to 80Rb 0
81Sr 80.92322 22.3 m EC to 81Rb 1/2 0.544
82Sr 81.91840 25.36 d EC to 82Rb 1/2
83Sr 82.91756 1.350 d EC to 83Rb 7/2 -0.898
85Sr 84.912936 64.85 d EC to 85Rb 9/2 -1.001
89Sr 88.907455 50.52 d β- to 89Y 5/2 -1.149
90Sr 89.907738 29.1 y β- to 90Y 0
91Sr 90.91020 9.5 h β- to 91Y 5/2 -0.887
92Sr 91.91098 2.71 h β- to 92Y 0

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  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 strontium

Common reference compound: SrCl2/D2O.

Table of NMR-active nucleus propeties of strontium
  Isotope 1 Isotope 2 Isotope 3
Isotope 87Sr
Natural abundance /% 7.00
Spin (I) 9/2
Frequency relative to 1H = 100 (MHz) 4.333800
Receptivity, DP, relative to 1H = 1.00 0.000190
Receptivity, DC, relative to 13C = 1.00 1.09
Magnetogyric ratio, γ (107 rad T‑1 s-1) -1.1639376
Magnetic moment, μ (μN) -1.2090236
Nuclear quadrupole moment, Q/millibarn 305(2)
Line width factor, 1056 l (m4) 0.0083


  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.

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