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Radionuclide Dosimetric Data Sheets
Barium-128
Summary data
General
Classification
Isotope: Ba-128
Atomic number (Z): 56
Mass number (A): 128
Neutron number (N): 72
Radioactive decay
Decay modes: Electron capture
Half-life: 2.43 [d]
Decay constant: 3.3015e-06 [1/s]
Daughters: Cs-128 (100.0%)
Radioactive daughters: Cs-128
Dosimetric constants
Mean alpha energy: 0.0 [MeV]
Mean electron energy: 0.00862 [MeV]
Mean photon energy: 0.06651 [MeV]
Air kerma rate constant, Γ10: 5.566e-18 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 5.566e-18 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 1.381e-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-:
1.381e-15 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 1.066e-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-128 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-128 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-128 Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
2.18872e-05 |
1.170e+01 |
X-ray |
|
4.27312e-03 |
3.993e-02 |
X-ray |
|
4.61551e-03 |
2.334e-02 |
X-ray |
|
3.06218e-02 |
2.173e-01 |
X-ray |
|
3.09789e-02 |
4.013e-01 |
X-ray |
|
3.49256e-02 |
3.802e-02 |
X-ray |
|
3.49944e-02 |
7.369e-02 |
X-ray |
|
3.58172e-02 |
1.559e-02 |
X-ray |
|
2.73440e-01 |
1.450e-01 |
Gamma |
|
2.09977e-05 |
1.563e+00 |
Auger electron |
|
4.14532e-05 |
5.550e+00 |
Auger electron |
|
1.19511e-04 |
6.867e-01 |
Auger electron |
|
3.35081e-04 |
1.403e-01 |
Auger electron |
|
5.28505e-04 |
1.520e+00 |
Auger electron |
|
6.53394e-04 |
9.977e-02 |
Auger electron |
|
3.44905e-03 |
5.974e-01 |
Auger electron |
|
4.17063e-03 |
1.843e-01 |
Auger electron |
|
4.92130e-03 |
1.420e-02 |
Auger electron |
|
2.53980e-02 |
5.699e-02 |
Auger electron |
|
2.98089e-02 |
2.590e-02 |
Auger 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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