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Radionuclide Dosimetric Data Sheets
Antimony-131
Summary data
General
Classification
Isotope: Sb-131
Atomic number (Z): 51
Mass number (A): 131
Neutron number (N): 80
Radioactive decay
Decay modes: β-
Half-life: 23.03 [m]
Decay constant: 5.0163e-04 [1/s]
Daughters: Te-131 (91.8%), Te-131m (8.21%)
Radioactive daughters: Te-131, Te-131m
Dosimetric constants
Mean alpha energy: 0.0 [MeV]
Mean electron energy: 0.58674 [MeV]
Mean photon energy: 2.0733 [MeV]
Air kerma rate constant, Γ10: 7.110e-17 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 7.110e-17 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 9.401e-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-:
9.401e-14 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 3.322e-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/Sb-131 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/Sb-131 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/Sb-131 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/Sb-131 Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
1.36106e-05 |
3.008e-01 |
X-ray |
|
1.34600e-01 |
2.495e-02 |
Gamma |
|
2.74200e-01 |
2.402e-02 |
Gamma |
|
2.95700e-01 |
3.188e-02 |
Gamma |
|
3.01400e-01 |
2.356e-02 |
Gamma |
|
3.23800e-01 |
1.201e-02 |
Gamma |
|
3.26200e-01 |
1.201e-02 |
Gamma |
|
4.33800e-01 |
3.835e-02 |
Gamma |
|
4.56700e-01 |
1.386e-02 |
Gamma |
|
6.19700e-01 |
1.571e-02 |
Gamma |
|
6.25600e-01 |
2.402e-02 |
Gamma |
|
6.25600e-01 |
2.402e-02 |
Gamma |
|
6.42300e-01 |
2.310e-01 |
Gamma |
|
6.57900e-01 |
7.161e-02 |
Gamma |
|
6.69000e-01 |
1.894e-02 |
Gamma |
|
7.26300e-01 |
4.019e-02 |
Gamma |
|
8.24900e-01 |
2.587e-02 |
Gamma |
|
8.24900e-01 |
2.587e-02 |
Gamma |
|
8.54600e-01 |
3.234e-02 |
Gamma |
|
9.33100e-01 |
2.587e-01 |
Gamma |
|
9.43400e-01 |
4.620e-01 |
Gamma |
|
9.91500e-01 |
1.386e-02 |
Gamma |
|
1.12360e+00 |
9.101e-02 |
Gamma |
|
1.20740e+00 |
3.881e-02 |
Gamma |
|
1.23380e+00 |
2.264e-02 |
Gamma |
|
1.26750e+00 |
2.911e-02 |
Gamma |
|
1.39890e+00 |
1.340e-02 |
Gamma |
|
1.47030e+00 |
1.428e-02 |
Gamma |
|
1.51720e+00 |
1.275e-02 |
Gamma |
|
1.57350e+00 |
1.160e-02 |
Gamma |
|
1.60880e+00 |
1.386e-02 |
Gamma |
|
1.72200e+00 |
2.402e-02 |
Gamma |
|
1.75610e+00 |
1.109e-02 |
Gamma |
|
1.82130e+00 |
1.201e-02 |
Gamma |
|
1.85440e+00 |
4.112e-02 |
Gamma |
|
1.85440e+00 |
4.112e-02 |
Gamma |
|
1.96570e+00 |
1.160e-02 |
Gamma |
|
2.17990e+00 |
2.033e-02 |
Gamma |
|
2.33500e+00 |
1.848e-02 |
Gamma |
|
2.39860e+00 |
1.109e-02 |
Gamma |
|
2.66230e+00 |
1.016e-02 |
Gamma |
|
1.63466e-01 |
2.456e-02 |
Beta |
|
1.86458e-01 |
2.547e-02 |
Beta |
|
2.03906e-01 |
2.183e-02 |
Beta |
|
2.24900e-01 |
4.366e-02 |
Beta |
|
2.62695e-01 |
2.729e-02 |
Beta |
|
2.87464e-01 |
2.001e-02 |
Beta |
|
3.31462e-01 |
2.729e-02 |
Beta |
|
3.50247e-01 |
2.365e-02 |
Beta |
|
3.97129e-01 |
7.823e-02 |
Beta |
|
4.77739e-01 |
2.593e-01 |
Beta |
|
4.87173e-01 |
3.730e-02 |
Beta |
|
5.44446e-01 |
1.455e-02 |
Beta |
|
5.67306e-01 |
3.639e-02 |
Beta |
|
6.22223e-01 |
1.274e-02 |
Beta |
|
6.55234e-01 |
1.546e-02 |
Beta |
|
6.56638e-01 |
3.184e-02 |
Beta |
|
6.89514e-01 |
1.219e-02 |
Beta |
|
7.45962e-01 |
3.002e-02 |
Beta |
|
7.73051e-01 |
2.001e-02 |
Beta |
|
8.41833e-01 |
1.455e-02 |
Beta |
|
8.50428e-01 |
2.183e-02 |
Beta |
|
8.92982e-01 |
5.185e-02 |
Beta |
|
1.03115e+00 |
9.097e-02 |
Beta |
|
1.23364e+00 |
4.457e-02 |
Beta |
|
2.29189e-05 |
1.470e-01 |
Auger electron |
|
2.49468e-05 |
4.886e-02 |
Auger electron |
|
1.21476e-04 |
1.680e-02 |
Auger electron |
|
4.49180e-04 |
3.813e-02 |
Auger electron |
|
3.08071e-03 |
1.497e-02 |
Auger electron |
|
1.02795e-01 |
1.121e-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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