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Radionuclide Dosimetric Data Sheets
Bromine-73
Summary data
General
Classification
Isotope: Br-73
Atomic number (Z): 35
Mass number (A): 73
Neutron number (N): 38
Radioactive decay
Decay modes: β+, Electron capture
Half-life: 3.4 [m]
Decay constant: 3.3978e-03 [1/s]
Daughters: Se-73m (99.9%), Se-73 (0.119%)
Radioactive daughters: Se-73m, Se-73
Dosimetric constants
Mean alpha energy: 0.0 [MeV]
Mean electron energy: 1.34337 [MeV]
Mean photon energy: 1.43313 [MeV]
Air kerma rate constant, Γ10: 2.069e-17 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 5.779e-17 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 2.152e-13 [Gy·kg/Bq·s]
Equilibrium dose constant for alphas, Δα: 0.000e+00
[Gy·kg/Bq·s]
Equilibrium dose constant for betas/electrons, Δβ-,β+,e-:
2.152e-13 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 2.296e-13
[Gy·kg/Bq·s]
Dose point kernels (plot)
Dose point kernel source: Graves, et al. Medical Physics. 2019 Nov.; 46(11):5284-5293.
Note: Bins are spaced every 0.1 mm until a radius of 10 cm, and every 1 mm until a radius of 2 m.
Download tabulated dose point kernel file here: www.mirdsoft.org/products/MIRDspecs/Br-73 DPK.csv
Summary spectra (plot)
Spectra source: ICRP Publication 107: Nuclear Decay Data for Dosimetric Calculations. Ann. ICRP 2008, 38 (3).
Download tabulated summary spectra file here: www.mirdsoft.org/products/MIRDspecs/Br-73 Summary Spectrum.csv
Beta spectra (plot)
Spectra source: ICRP Publication 107: Nuclear Decay Data for Dosimetric Calculations. Ann. ICRP 2008, 38 (3).
Download tabulated beta spectra file here: www.mirdsoft.org/products/MIRDspecs/Br-73 Beta Spectrum.csv
Tabulated data
Summary spectra (table)
Spectra source: ICRP Publication 107: Nuclear Decay Data for Dosimetric Calculations. Ann. ICRP 2008, 38 (3).
Note: Radiations with yield < 0.01 are excluded from the table, but are available in the linked *.csv data.
Download tabulated summary spectra file here: www.mirdsoft.org/products/MIRDspecs/Br-73 Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
1.58642e-05 |
1.317e+00 |
X-ray |
|
1.11378e-02 |
2.689e-02 |
X-ray |
|
1.11804e-02 |
5.201e-02 |
X-ray |
|
6.50000e-02 |
3.700e-01 |
Gamma |
|
1.25600e-01 |
7.548e-02 |
Gamma |
|
2.75200e-01 |
2.701e-02 |
Gamma |
|
3.35900e-01 |
1.043e-01 |
Gamma |
|
3.74700e-01 |
2.220e-02 |
Gamma |
|
4.00900e-01 |
5.957e-02 |
Gamma |
|
4.89800e-01 |
1.036e-02 |
Gamma |
|
5.11000e-01 |
1.916e+00 |
Annihilation photon |
|
5.40000e-01 |
1.887e-02 |
Gamma |
|
5.40000e-01 |
1.887e-02 |
Gamma |
|
6.15300e-01 |
2.072e-02 |
Gamma |
|
6.39000e-01 |
1.036e-02 |
Gamma |
|
6.99800e-01 |
9.139e-02 |
Gamma |
|
8.49400e-01 |
5.846e-02 |
Gamma |
|
8.70700e-01 |
1.258e-02 |
Gamma |
|
9.14300e-01 |
5.143e-02 |
Gamma |
|
9.31400e-01 |
5.846e-02 |
Gamma |
|
9.96200e-01 |
1.887e-02 |
Gamma |
|
1.46020e+00 |
1.184e-02 |
Gamma |
|
8.93564e-01 |
1.427e-02 |
Positron |
|
1.13963e+00 |
8.768e-02 |
Positron |
|
1.17804e+00 |
1.325e-01 |
Positron |
|
1.24847e+00 |
1.223e-01 |
Positron |
|
1.31895e+00 |
3.670e-02 |
Positron |
|
1.35457e+00 |
1.427e-02 |
Positron |
|
1.42058e+00 |
1.733e-01 |
Positron |
|
1.58048e+00 |
1.580e-01 |
Positron |
|
1.61147e+00 |
2.141e-01 |
Positron |
|
3.25123e-05 |
6.081e-01 |
Auger electron |
|
5.45671e-05 |
2.246e-01 |
Auger electron |
|
9.44002e-05 |
3.869e-02 |
Auger electron |
|
1.23729e-03 |
1.943e-01 |
Auger electron |
|
9.62662e-03 |
4.842e-02 |
Auger electron |
|
1.09573e-02 |
1.427e-02 |
Auger electron |
|
5.23810e-02 |
1.117e-01 |
Conversion electron |
|
6.33585e-02 |
1.160e-02 |
Conversion electron |
Useful Links
Isotope decay characteristics are periodically updated as better measurements can be made - changes that may not be reflected on this page. Please see useful links:
National Nuclear Data Center (NNDC): https://www.nndc.bnl.gov/nudat3/mird/
International Atomic Energy Agency (IAEA) Livechart: https://www-nds.iaea.org/relnsd/vcharthtml/VChartHTML.html
Reference Links
ICRP Report 107: https://www.icrp.org/publication.asp?id=ICRP%20Publication%20107
Graves et al. Dose Point Kernels: https://doi.org/10.1002/mp.13789
MIRD Decay Schemes 2nd Edition: https://sites.snmmi.org/SNMMI-MAIN/iCore/Store/StoreLayouts/Item_Detail.aspx?iProductCode=0-932004-80-6
MIRDsoft MIRDspecs version 20250101 (www.mirdsoft.org)
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