<= Return to MIRDspec isotope database
Radionuclide Dosimetric Data Sheets
Bromine-77m
Summary data
General
Classification
Isotope: Br-77m
Atomic number (Z): 35
Mass number (A): 77
Neutron number (N): 42
Radioactive decay
Decay modes: Internal transition
Half-life: 4.28 [m]
Decay constant: 2.6992e-03 [1/s]
Daughters: Br-77 (100.0%)
Radioactive daughters: Br-77
Dosimetric constants
Mean alpha energy: 0.0 [MeV]
Mean electron energy: 0.08762 [MeV]
Mean photon energy: 0.01967 [MeV]
Air kerma rate constant, Γ10: 1.721e-17 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 1.721e-17 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 1.404e-14 [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-:
1.404e-14 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 3.151e-15
[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-77m 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-77m Summary 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-77m Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
1.75873e-05 |
5.995e+00 |
X-ray |
|
1.18329e-02 |
1.217e-01 |
X-ray |
|
1.18814e-02 |
2.350e-01 |
X-ray |
|
1.32432e-02 |
1.679e-02 |
X-ray |
|
1.32502e-02 |
3.275e-02 |
X-ray |
|
1.05870e-01 |
1.380e-01 |
Gamma |
|
4.38396e-05 |
2.702e+00 |
Auger electron |
|
5.76197e-05 |
1.041e+00 |
Auger electron |
|
8.85320e-05 |
1.595e-01 |
Auger electron |
|
1.32050e-03 |
9.070e-01 |
Auger electron |
|
1.41061e-03 |
5.366e-02 |
Auger electron |
|
1.02029e-02 |
1.947e-01 |
Auger electron |
|
1.16354e-02 |
5.956e-02 |
Auger electron |
|
9.24350e-02 |
6.684e-01 |
Conversion electron |
|
1.04101e-01 |
5.891e-02 |
Conversion electron |
|
1.04268e-01 |
5.198e-02 |
Conversion electron |
|
1.04316e-01 |
6.477e-02 |
Conversion electron |
|
1.05685e-01 |
2.886e-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)
<= Return to MIRDspec isotope database
