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Radionuclide Dosimetric Data Sheets
Barium-129
Summary data
General
Classification
Isotope: Ba-129
Atomic number (Z): 56
Mass number (A): 129
Neutron number (N): 73
Radioactive decay
Decay modes: β+, Electron capture
Half-life: 2.23 [h]
Decay constant: 8.6341e-05 [1/s]
Daughters: Cs-129 (100.0%)
Radioactive daughters: Cs-129
Dosimetric constants
Mean alpha energy: 0.0 [MeV]
Mean electron energy: 0.127 [MeV]
Mean photon energy: 0.33313 [MeV]
Air kerma rate constant, Γ10: 7.611e-18 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 1.478e-17 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 2.035e-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-:
2.035e-14 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 5.337e-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-129 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-129 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/Ba-129 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/Ba-129 Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
2.18868e-05 |
1.185e+01 |
X-ray |
|
4.27312e-03 |
4.132e-02 |
X-ray |
|
4.61551e-03 |
2.454e-02 |
X-ray |
|
3.06218e-02 |
1.892e-01 |
X-ray |
|
3.09789e-02 |
3.493e-01 |
X-ray |
|
3.49256e-02 |
3.310e-02 |
X-ray |
|
3.49944e-02 |
6.415e-02 |
X-ray |
|
3.58172e-02 |
1.357e-02 |
X-ray |
|
1.29140e-01 |
5.510e-02 |
Gamma |
|
1.35610e-01 |
1.000e-02 |
Gamma |
|
2.14300e-01 |
8.500e-02 |
Gamma |
|
2.20830e-01 |
5.400e-02 |
Gamma |
|
5.11000e-01 |
3.703e-01 |
Annihilation photon |
|
5.54100e-01 |
2.940e-02 |
Gamma |
|
1.16460e+00 |
1.100e-02 |
Gamma |
|
5.35487e-01 |
1.996e-02 |
Positron |
|
5.73261e-01 |
1.397e-02 |
Positron |
|
6.33617e-01 |
1.497e-01 |
Positron |
|
2.08693e-05 |
1.575e+00 |
Auger electron |
|
4.14316e-05 |
5.625e+00 |
Auger electron |
|
1.19594e-04 |
6.894e-01 |
Auger electron |
|
3.24208e-04 |
1.256e-01 |
Auger electron |
|
5.28162e-04 |
1.552e+00 |
Auger electron |
|
6.52472e-04 |
1.017e-01 |
Auger electron |
|
1.18680e-03 |
5.517e-02 |
Conversion electron |
|
1.54390e-03 |
8.771e-02 |
Conversion electron |
|
3.44239e-03 |
6.087e-01 |
Auger electron |
|
4.16297e-03 |
1.877e-01 |
Auger electron |
|
4.91187e-03 |
1.444e-02 |
Auger electron |
|
5.55932e-03 |
3.060e-02 |
Conversion electron |
|
2.53980e-02 |
4.961e-02 |
Auger electron |
|
2.98089e-02 |
2.255e-02 |
Auger electron |
|
9.31550e-02 |
2.140e-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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