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Radionuclide Dosimetric Data Sheets
Barium-131
Summary data
General
Classification
Isotope: Ba-131
Atomic number (Z): 56
Mass number (A): 131
Neutron number (N): 75
Radioactive decay
Decay modes: Electron capture
Half-life: 11.5 [d]
Decay constant: 6.9761e-07 [1/s]
Daughters: Cs-131 (100.0%)
Radioactive daughters: Cs-131
Dosimetric constants
Mean alpha energy: 0.0 [MeV]
Mean electron energy: 0.04551 [MeV]
Mean photon energy: 0.47634 [MeV]
Air kerma rate constant, Γ10: 2.151e-17 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 2.151e-17 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 7.292e-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-:
7.292e-15 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 7.632e-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/Ba-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/Ba-131 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/Ba-131 Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
2.18868e-05 |
1.543e+01 |
X-ray |
|
4.27312e-03 |
5.320e-02 |
X-ray |
|
4.61551e-03 |
3.169e-02 |
X-ray |
|
3.06218e-02 |
2.802e-01 |
X-ray |
|
3.09789e-02 |
5.175e-01 |
X-ray |
|
3.49256e-02 |
4.903e-02 |
X-ray |
|
3.49944e-02 |
9.503e-02 |
X-ray |
|
3.58031e-02 |
1.032e-02 |
X-ray |
|
3.58172e-02 |
2.011e-02 |
X-ray |
|
1.23805e-01 |
2.897e-01 |
Gamma |
|
1.33609e-01 |
2.125e-02 |
Gamma |
|
2.16078e-01 |
1.966e-01 |
Gamma |
|
2.39629e-01 |
2.410e-02 |
Gamma |
|
2.49432e-01 |
2.813e-02 |
Gamma |
|
3.73246e-01 |
1.404e-01 |
Gamma |
|
4.04046e-01 |
1.310e-02 |
Gamma |
|
4.86522e-01 |
2.087e-02 |
Gamma |
|
4.96326e-01 |
4.680e-01 |
Gamma |
|
5.85041e-01 |
1.193e-02 |
Gamma |
|
6.20111e-01 |
1.437e-02 |
Gamma |
|
1.04760e+00 |
1.324e-02 |
Gamma |
|
2.09266e-05 |
2.056e+00 |
Auger electron |
|
4.14416e-05 |
7.324e+00 |
Auger electron |
|
1.19617e-04 |
9.008e-01 |
Auger electron |
|
3.29106e-04 |
1.738e-01 |
Auger electron |
|
5.28304e-04 |
2.014e+00 |
Auger electron |
|
6.52853e-04 |
1.321e-01 |
Auger electron |
|
3.44594e-03 |
7.914e-01 |
Auger electron |
|
4.16699e-03 |
2.441e-01 |
Auger electron |
|
4.91673e-03 |
1.880e-02 |
Auger electron |
|
2.53980e-02 |
7.350e-02 |
Auger electron |
|
2.98089e-02 |
3.340e-02 |
Auger electron |
|
4.27480e-02 |
1.151e-02 |
Conversion electron |
|
8.78200e-02 |
1.790e-01 |
Conversion electron |
|
1.18120e-01 |
1.696e-02 |
Conversion electron |
|
1.18442e-01 |
2.115e-02 |
Conversion electron |
|
1.18799e-01 |
2.264e-02 |
Conversion electron |
|
1.22814e-01 |
1.307e-02 |
Conversion electron |
|
1.80093e-01 |
1.829e-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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