Isotopes of bromine

Isotope data

Both Bromine isotopes arused in nuclear medicine. Br-81 is used for the production of the radioisotope Kr-81m which is used for diagnostics. Br-79 can be used for the cyclotron production of Kr-77 which decays to the radioisotope Br-77 although the most common production route for Br-77 is via Se-77. Br-77 has been suggested for radiotherapy because of it electron capture decay and ease of labeling. Bromine isotopes can be obtained from Trace Sciences International.

Naturally occurring isotopes

This table shows information about naturally occuring isotopes, their atomic masses, their natural undances, their nuclear spins, and their magnetic moments. Further data for radioisotopes (radioactive isotopes) of bromine are listed (including any which occur naturally) below.
Isotope Atomic mass (ma/u) Natural abundance (atom %) Nuclear spin (I) Magnetic moment (μ/μN)
7/sup>Br 78.9183361 (26) 50.69 (7) 3/2 2.106399
81Br 80.916289 (6) 49.31 (7) 3/2 2.270560

Isotopic abundances of Br
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 n 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 bromine are listed above. This table gives information about some radiosotopes of bromine, their masses, their lf-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
72Br 71.9365 1.31 m EC to 72Se 3 73Br 72.9318 3.4 m EC to 73Se 3/2
74Br 73.92989 25.4 m EC to 74Se
75Br 74.92578 1.62 h EC to 75Se 3/2 0.75
76Br 75.92454 16.0 h EC to 76Se 1 0.54821
77Br 76.921380 2.376 d EC to 77Se 3/2
78Br 77.921146 6.46 m EC to 78Se; β- to 78Kr 1 0.1
80Br 79.918530 17.66 m EC to 80Se; β- to 80Kr 1 0.5140
82Br 81.916805 1.471 d β- to 82Kr 5 1.6270
83Br 82.915181 2.40 h β- to 83Kr 3/2
84Br 83.91651 31.8 m β- to 84Kr 2
85Br 84.91561 2.87 m β- to 85Kr 3/2

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 Chemistryem>, 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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bromine atomic number