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Radionuclide Dosimetric Data Sheets
Bromine-74m
Summary data
General
Classification
Isotope: Br-74m
Atomic number (Z): 35
Mass number (A): 74
Neutron number (N): 39
Radioactive decay
Decay modes: β+, Electron capture
Half-life: 46.0 [m]
Decay constant: 2.5114e-04 [1/s]
Daughters: Se-74 (100.0%)
Radioactive daughters: None
Dosimetric constants
Mean alpha energy: 0.0 [MeV]
Mean electron energy: 1.27473 [MeV]
Mean photon energy: 4.14665 [MeV]
Air kerma rate constant, Γ10: 1.061e-16 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 1.400e-16 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 2.042e-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-:
2.042e-13 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 6.644e-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-74m 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-74m 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-74m 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-74m Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
1.58643e-05 |
9.661e-01 |
X-ray |
|
1.11378e-02 |
1.964e-02 |
X-ray |
|
1.11804e-02 |
3.799e-02 |
X-ray |
|
2.19000e-01 |
5.016e-02 |
Gamma |
|
5.11000e-01 |
1.754e+00 |
Annihilation photon |
|
6.15150e-01 |
6.658e-02 |
Gamma |
|
6.34300e-01 |
1.642e-01 |
Gamma |
|
6.34800e-01 |
9.120e-01 |
Gamma |
|
7.28300e-01 |
3.557e-01 |
Gamma |
|
7.44700e-01 |
2.462e-02 |
Gamma |
|
8.38960e-01 |
5.107e-02 |
Gamma |
|
9.84700e-01 |
3.374e-02 |
Gamma |
|
1.20050e+00 |
5.198e-02 |
Gamma |
|
1.24950e+00 |
6.658e-02 |
Gamma |
|
1.26910e+00 |
8.846e-02 |
Gamma |
|
1.29460e+00 |
2.006e-02 |
Gamma |
|
1.36660e+00 |
2.280e-02 |
Gamma |
|
1.45570e+00 |
1.824e-02 |
Gamma |
|
1.47310e+00 |
1.459e-02 |
Gamma |
|
1.71480e+00 |
6.110e-02 |
Gamma |
|
1.71480e+00 |
6.110e-02 |
Gamma |
|
2.18340e+00 |
1.003e-02 |
Gamma |
|
2.28380e+00 |
2.462e-02 |
Gamma |
|
2.31210e+00 |
3.374e-02 |
Gamma |
|
2.38830e+00 |
1.186e-02 |
Gamma |
|
2.70180e+00 |
1.186e-02 |
Gamma |
|
3.04040e+00 |
1.094e-02 |
Gamma |
|
3.04040e+00 |
1.094e-02 |
Gamma |
|
3.15330e+00 |
1.003e-02 |
Gamma |
|
3.17310e+00 |
1.094e-02 |
Gamma |
|
3.29770e+00 |
1.368e-02 |
Gamma |
|
3.33630e+00 |
1.186e-02 |
Gamma |
|
3.43080e+00 |
1.277e-02 |
Gamma |
|
3.80670e+00 |
1.094e-02 |
Gamma |
|
3.86180e+00 |
1.459e-02 |
Gamma |
|
3.95150e+00 |
1.094e-02 |
Gamma |
|
3.95760e+00 |
3.739e-02 |
Gamma |
|
4.02710e+00 |
1.094e-02 |
Gamma |
|
5.38950e-01 |
1.969e-02 |
Positron |
|
5.70128e-01 |
3.741e-02 |
Positron |
|
5.72784e-01 |
1.772e-02 |
Positron |
|
6.04113e-01 |
2.067e-02 |
Positron |
|
6.13072e-01 |
2.363e-02 |
Positron |
|
6.37604e-01 |
2.166e-02 |
Positron |
|
9.44132e-01 |
1.674e-02 |
Positron |
|
1.01241e+00 |
3.741e-02 |
Positron |
|
1.23001e+00 |
2.264e-02 |
Positron |
|
1.26865e+00 |
2.560e-02 |
Positron |
|
1.27162e+00 |
1.083e-02 |
Positron |
|
1.36188e+00 |
3.446e-02 |
Positron |
|
1.40859e+00 |
2.166e-02 |
Positron |
|
1.52796e+00 |
7.679e-02 |
Positron |
|
1.61466e+00 |
3.938e-02 |
Positron |
|
1.64512e+00 |
1.122e-02 |
Positron |
|
1.73032e+00 |
4.824e-02 |
Positron |
|
1.83766e+00 |
6.596e-02 |
Positron |
|
1.86996e+00 |
1.772e-02 |
Positron |
|
2.08834e+00 |
7.876e-02 |
Positron |
|
2.14097e+00 |
5.907e-02 |
Positron |
|
2.44464e+00 |
5.907e-02 |
Positron |
|
3.25136e-05 |
4.461e-01 |
Auger electron |
|
5.45920e-05 |
1.650e-01 |
Auger electron |
|
9.46442e-05 |
2.892e-02 |
Auger electron |
|
1.23735e-03 |
1.422e-01 |
Auger electron |
|
9.62662e-03 |
3.536e-02 |
Auger electron |
|
1.09573e-02 |
1.042e-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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