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Radionuclide Dosimetric Data Sheets
Bromine-74
Summary data
General
Classification
Isotope: Br-74
Atomic number (Z): 35
Mass number (A): 74
Neutron number (N): 39
Radioactive decay
Decay modes: β+, Electron capture
Half-life: 25.4 [m]
Decay constant: 4.5482e-04 [1/s]
Daughters: Se-74 (100.0%)
Radioactive daughters: None
Dosimetric constants
Mean alpha energy: 0.0 [MeV]
Mean electron energy: 1.06163 [MeV]
Mean photon energy: 4.61296 [MeV]
Air kerma rate constant, Γ10: 1.084e-16 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 1.429e-16 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 1.701e-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-:
1.701e-13 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 7.391e-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-74 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-74 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-74 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-74 Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
1.58642e-05 |
8.933e-01 |
X-ray |
|
1.11378e-02 |
1.816e-02 |
X-ray |
|
1.11804e-02 |
3.513e-02 |
X-ray |
|
2.18900e-01 |
1.808e-01 |
Gamma |
|
5.11000e-01 |
1.782e+00 |
Annihilation photon |
|
6.34200e-01 |
1.410e-01 |
Gamma |
|
6.34800e-01 |
6.410e-01 |
Gamma |
|
9.84900e-01 |
3.974e-02 |
Gamma |
|
1.02280e+00 |
5.192e-02 |
Gamma |
|
1.20390e+00 |
1.538e-02 |
Gamma |
|
1.22570e+00 |
1.346e-02 |
Gamma |
|
1.26890e+00 |
6.731e-02 |
Gamma |
|
1.47450e+00 |
1.090e-02 |
Gamma |
|
1.51280e+00 |
1.731e-02 |
Gamma |
|
1.71570e+00 |
1.346e-02 |
Gamma |
|
1.74390e+00 |
1.154e-02 |
Gamma |
|
1.84280e+00 |
2.244e-02 |
Gamma |
|
1.88230e+00 |
1.603e-02 |
Gamma |
|
1.94960e+00 |
1.474e-02 |
Gamma |
|
1.98100e+00 |
1.346e-02 |
Gamma |
|
2.08740e+00 |
1.410e-02 |
Gamma |
|
2.13060e+00 |
2.884e-02 |
Gamma |
|
2.27060e+00 |
1.667e-02 |
Gamma |
|
2.39610e+00 |
2.820e-02 |
Gamma |
|
2.61520e+00 |
7.372e-02 |
Gamma |
|
2.66160e+00 |
5.192e-02 |
Gamma |
|
2.70400e+00 |
1.538e-02 |
Gamma |
|
2.77080e+00 |
2.051e-02 |
Gamma |
|
2.90450e+00 |
1.667e-02 |
Gamma |
|
2.97560e+00 |
1.410e-02 |
Gamma |
|
3.24990e+00 |
6.154e-02 |
Gamma |
|
3.29550e+00 |
2.756e-02 |
Gamma |
|
3.46000e+00 |
1.218e-02 |
Gamma |
|
3.62460e+00 |
5.577e-02 |
Gamma |
|
3.63190e+00 |
2.564e-02 |
Gamma |
|
3.73330e+00 |
1.795e-02 |
Gamma |
|
3.78800e+00 |
4.038e-02 |
Gamma |
|
3.85240e+00 |
1.282e-02 |
Gamma |
|
3.90150e+00 |
1.410e-02 |
Gamma |
|
3.97270e+00 |
2.308e-02 |
Gamma |
|
4.26650e+00 |
1.090e-02 |
Gamma |
|
4.34240e+00 |
1.346e-02 |
Gamma |
|
4.37960e+00 |
4.167e-02 |
Gamma |
|
5.89017e-01 |
1.534e-02 |
Positron |
|
6.59458e-01 |
4.287e-02 |
Positron |
|
7.03140e-01 |
1.229e-02 |
Positron |
|
7.10776e-01 |
2.763e-02 |
Positron |
|
8.12298e-01 |
2.096e-02 |
Positron |
|
8.15090e-01 |
3.525e-02 |
Positron |
|
8.64642e-01 |
6.574e-02 |
Positron |
|
8.70247e-01 |
4.478e-02 |
Positron |
|
9.30320e-01 |
9.718e-02 |
Positron |
|
9.55635e-01 |
3.144e-02 |
Positron |
|
1.02942e+00 |
8.003e-02 |
Positron |
|
1.04582e+00 |
7.145e-02 |
Positron |
|
1.18136e+00 |
1.677e-01 |
Positron |
|
1.86354e+00 |
2.763e-02 |
Positron |
|
2.13460e+00 |
6.193e-02 |
Positron |
|
2.32864e+00 |
3.620e-02 |
Positron |
|
2.43812e+00 |
3.811e-02 |
Positron |
|
3.25135e-05 |
4.125e-01 |
Auger electron |
|
5.45895e-05 |
1.526e-01 |
Auger electron |
|
9.46172e-05 |
2.668e-02 |
Auger electron |
|
1.23734e-03 |
1.316e-01 |
Auger electron |
|
9.62662e-03 |
3.270e-02 |
Auger 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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