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Radionuclide Dosimetric Data Sheets
Barium-129m
Summary data
General
Classification
Isotope: Ba-129m
Atomic number (Z): 56
Mass number (A): 129
Neutron number (N): 73
Radioactive decay
Decay modes: β+, Electron capture
Half-life: 2.16 [h]
Decay constant: 8.9139e-05 [1/s]
Daughters: Cs-129 (100.0%)
Radioactive daughters: Cs-129
Dosimetric constants
Mean alpha energy: 0.0 [MeV]
Mean electron energy: 0.04185 [MeV]
Mean photon energy: 1.5833 [MeV]
Air kerma rate constant, Γ10: 5.919e-17 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 5.961e-17 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 6.705e-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-:
6.705e-15 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 2.537e-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/Ba-129m 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-129m 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-129m 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-129m Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
2.18863e-05 |
2.265e+01 |
X-ray |
|
6.46297e-04 |
1.069e-02 |
X-ray |
|
4.27312e-03 |
8.022e-02 |
X-ray |
|
4.61550e-03 |
4.906e-02 |
X-ray |
|
4.92286e-03 |
1.223e-02 |
X-ray |
|
3.06218e-02 |
2.489e-01 |
X-ray |
|
3.09789e-02 |
4.597e-01 |
X-ray |
|
3.49256e-02 |
4.355e-02 |
X-ray |
|
3.49944e-02 |
8.442e-02 |
X-ray |
|
3.58172e-02 |
1.786e-02 |
X-ray |
|
1.29140e-01 |
4.484e-02 |
Gamma |
|
1.77020e-01 |
2.858e-02 |
Gamma |
|
1.82320e-01 |
3.800e-01 |
Gamma |
|
2.02380e-01 |
1.281e-01 |
Gamma |
|
2.14300e-01 |
3.310e-02 |
Gamma |
|
2.20830e-01 |
2.155e-02 |
Gamma |
|
2.37650e-01 |
1.098e-02 |
Gamma |
|
3.92330e-01 |
8.436e-02 |
Gamma |
|
3.94500e-01 |
2.470e-02 |
Gamma |
|
4.14000e-01 |
1.045e-02 |
Gamma |
|
4.16100e-01 |
1.045e-02 |
Gamma |
|
4.19830e-01 |
1.015e-01 |
Gamma |
|
4.19830e-01 |
1.015e-01 |
Gamma |
|
4.59430e-01 |
5.966e-02 |
Gamma |
|
4.67760e-01 |
1.870e-02 |
Gamma |
|
4.81300e-01 |
3.618e-02 |
Gamma |
|
5.01380e-01 |
2.565e-02 |
Gamma |
|
5.11000e-01 |
2.171e-02 |
Annihilation photon |
|
5.34300e-01 |
1.258e-02 |
Gamma |
|
5.42600e-01 |
1.463e-02 |
Gamma |
|
5.46400e-01 |
4.408e-02 |
Gamma |
|
5.49000e-01 |
1.752e-02 |
Gamma |
|
5.51500e-01 |
1.752e-02 |
Gamma |
|
5.56900e-01 |
1.265e-02 |
Gamma |
|
5.66210e-01 |
2.884e-02 |
Gamma |
|
5.96780e-01 |
2.014e-02 |
Gamma |
|
6.56100e-01 |
1.448e-02 |
Gamma |
|
6.78800e-01 |
5.244e-02 |
Gamma |
|
6.89000e-01 |
1.585e-02 |
Gamma |
|
6.90300e-01 |
1.585e-02 |
Gamma |
|
7.00600e-01 |
1.030e-02 |
Gamma |
|
7.12000e-01 |
1.094e-02 |
Gamma |
|
7.48500e-01 |
2.633e-02 |
Gamma |
|
7.48500e-01 |
2.633e-02 |
Gamma |
|
7.69000e-01 |
1.121e-02 |
Gamma |
|
7.80200e-01 |
2.440e-02 |
Gamma |
|
8.03000e-01 |
3.238e-02 |
Gamma |
|
8.20700e-01 |
1.068e-02 |
Gamma |
|
8.72500e-01 |
2.022e-02 |
Gamma |
|
8.92600e-01 |
8.056e-02 |
Gamma |
|
9.33100e-01 |
1.714e-02 |
Gamma |
|
9.35000e-01 |
1.714e-02 |
Gamma |
|
9.57700e-01 |
1.554e-02 |
Gamma |
|
9.62600e-01 |
1.056e-02 |
Gamma |
|
9.99400e-01 |
2.972e-02 |
Gamma |
|
1.03460e+00 |
3.078e-02 |
Gamma |
|
1.04470e+00 |
5.244e-02 |
Gamma |
|
1.04710e+00 |
2.964e-02 |
Gamma |
|
1.12220e+00 |
1.968e-02 |
Gamma |
|
1.12640e+00 |
1.003e-02 |
Gamma |
|
1.20900e+00 |
2.546e-02 |
Gamma |
|
1.22160e+00 |
2.421e-02 |
Gamma |
|
1.45910e+00 |
1.900e-01 |
Gamma |
|
1.62360e+00 |
4.180e-02 |
Gamma |
|
2.07370e-05 |
3.000e+00 |
Auger electron |
|
4.14109e-05 |
1.076e+01 |
Auger electron |
|
1.19775e-04 |
1.309e+00 |
Auger electron |
|
3.08806e-04 |
2.073e-01 |
Auger electron |
|
5.27862e-04 |
2.989e+00 |
Auger electron |
|
6.51621e-04 |
1.956e-01 |
Auger electron |
|
1.18680e-03 |
2.764e-01 |
Conversion electron |
|
1.54390e-03 |
4.395e-01 |
Conversion electron |
|
3.43629e-03 |
1.168e+00 |
Auger electron |
|
4.15586e-03 |
3.600e-01 |
Auger electron |
|
4.90296e-03 |
2.766e-02 |
Auger electron |
|
5.55932e-03 |
1.533e-01 |
Conversion electron |
|
6.55000e-03 |
3.628e-02 |
Conversion electron |
|
2.53980e-02 |
6.529e-02 |
Auger electron |
|
2.98089e-02 |
2.967e-02 |
Auger electron |
|
9.31550e-02 |
1.742e-02 |
Conversion electron |
|
1.46335e-01 |
5.664e-02 |
Conversion electron |
|
1.66395e-01 |
1.428e-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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