<= Return to MIRDspec isotope database
Radionuclide Dosimetric Data Sheets
Barium-127
Summary data
General
Classification
Isotope: Ba-127
Atomic number (Z): 56
Mass number (A): 127
Neutron number (N): 71
Radioactive decay
Decay modes: β+, Electron capture
Half-life: 12.7 [m]
Decay constant: 9.0964e-04 [1/s]
Daughters: Cs-127 (100.0%)
Radioactive daughters: Cs-127
Dosimetric constants
Mean alpha energy: 0.0 [MeV]
Mean electron energy: 0.5971 [MeV]
Mean photon energy: 0.72824 [MeV]
Air kerma rate constant, Γ10: 7.813e-18 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 2.878e-17 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 9.567e-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-:
9.567e-14 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 1.167e-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-127 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-127 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-127 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-127 Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
2.18865e-05 |
8.368e+00 |
X-ray |
|
4.27312e-03 |
2.900e-02 |
X-ray |
|
4.61551e-03 |
1.756e-02 |
X-ray |
|
3.06218e-02 |
1.437e-01 |
X-ray |
|
3.09789e-02 |
2.654e-01 |
X-ray |
|
3.49256e-02 |
2.514e-02 |
X-ray |
|
3.49944e-02 |
4.873e-02 |
X-ray |
|
3.58172e-02 |
1.031e-02 |
X-ray |
|
6.63000e-02 |
2.120e-02 |
Gamma |
|
1.14800e-01 |
9.300e-02 |
Gamma |
|
1.80800e-01 |
1.240e-01 |
Gamma |
|
5.11000e-01 |
1.083e+00 |
Annihilation photon |
|
1.20100e+00 |
1.612e-02 |
Gamma |
|
1.01160e+00 |
1.559e-01 |
Positron |
|
1.09457e+00 |
3.680e-01 |
Positron |
|
2.08765e-05 |
1.113e+00 |
Auger electron |
|
4.14338e-05 |
3.974e+00 |
Auger electron |
|
1.19716e-04 |
4.870e-01 |
Auger electron |
|
3.24187e-04 |
8.982e-02 |
Auger electron |
|
5.28181e-04 |
1.096e+00 |
Auger electron |
|
6.52506e-04 |
7.181e-02 |
Auger electron |
|
3.44389e-03 |
4.301e-01 |
Auger electron |
|
4.16458e-03 |
1.326e-01 |
Auger electron |
|
4.91365e-03 |
1.021e-02 |
Auger electron |
|
2.53980e-02 |
3.769e-02 |
Auger electron |
|
2.98089e-02 |
1.713e-02 |
Auger electron |
|
3.03150e-02 |
8.261e-02 |
Conversion electron |
|
3.68150e-02 |
1.482e-02 |
Conversion electron |
|
6.09368e-02 |
2.950e-02 |
Conversion electron |
|
6.12939e-02 |
3.668e-02 |
Conversion electron |
|
6.53093e-02 |
1.604e-02 |
Conversion electron |
|
7.88150e-02 |
4.953e-02 |
Conversion electron |
|
1.44815e-01 |
1.938e-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)
<= Return to MIRDspec isotope database
