<= Return to MIRDspec isotope database
Radionuclide Dosimetric Data Sheets
Bromine-77
Summary data
General
Classification
Isotope: Br-77
Atomic number (Z): 35
Mass number (A): 77
Neutron number (N): 42
Radioactive decay
Decay modes: β+, Electron capture
Half-life: 57.04 [h]
Decay constant: 3.3758e-06 [1/s]
Daughters: Se-77 (100.0%)
Radioactive daughters: None
Dosimetric constants
Mean alpha energy: 0.0 [MeV]
Mean electron energy: 0.00937 [MeV]
Mean photon energy: 0.3209 [MeV]
Air kerma rate constant, Γ10: 3.554e-17 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 3.582e-17 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 1.501e-15 [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-:
1.501e-15 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 5.141e-14
[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-77 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-77 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-77 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-77 Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
1.58643e-05 |
7.623e+00 |
X-ray |
|
1.11378e-02 |
1.546e-01 |
X-ray |
|
1.11804e-02 |
2.990e-01 |
X-ray |
|
1.24492e-02 |
2.088e-02 |
X-ray |
|
1.24553e-02 |
4.075e-02 |
X-ray |
|
8.75900e-02 |
1.400e-02 |
Gamma |
|
1.61830e-01 |
1.102e-02 |
Gamma |
|
2.00400e-01 |
1.213e-02 |
Gamma |
|
2.38980e-01 |
2.310e-01 |
Gamma |
|
2.49770e-01 |
2.980e-02 |
Gamma |
|
2.81650e-01 |
2.287e-02 |
Gamma |
|
2.97230e-01 |
4.158e-02 |
Gamma |
|
3.03760e-01 |
1.178e-02 |
Gamma |
|
4.39470e-01 |
1.564e-02 |
Gamma |
|
4.84570e-01 |
1.000e-02 |
Gamma |
|
5.11000e-01 |
1.482e-02 |
Annihilation photon |
|
5.20690e-01 |
2.241e-01 |
Gamma |
|
5.74640e-01 |
1.187e-02 |
Gamma |
|
5.78910e-01 |
2.957e-02 |
Gamma |
|
5.85480e-01 |
1.568e-02 |
Gamma |
|
7.55350e-01 |
1.668e-02 |
Gamma |
|
8.17790e-01 |
2.079e-02 |
Gamma |
|
3.25138e-05 |
3.520e+00 |
Auger electron |
|
5.45963e-05 |
1.302e+00 |
Auger electron |
|
9.46913e-05 |
2.292e-01 |
Auger electron |
|
1.23738e-03 |
1.122e+00 |
Auger electron |
|
1.31569e-03 |
5.278e-02 |
Auger electron |
|
9.62662e-03 |
2.784e-01 |
Auger electron |
|
1.09573e-02 |
8.206e-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)
<= Return to MIRDspec isotope database
