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Radionuclide Dosimetric Data Sheets
Xenon-125
Summary data
General
Classification
Isotope: Xe-125
Atomic number (Z): 54
Mass number (A): 125
Neutron number (N): 71
Radioactive decay
Decay modes: β+, Electron capture
Half-life: 16.9 [h]
Decay constant: 1.1393e-05 [1/s]
Daughters: I-125 (100.0%)
Radioactive daughters: I-125
Dosimetric constants
Mean alpha energy: 0.0 [MeV]
Mean electron energy: 0.03504 [MeV]
Mean photon energy: 0.27231 [MeV]
Air kerma rate constant, Γ10: 1.491e-17 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 1.503e-17 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 5.614e-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-:
5.614e-15 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 4.363e-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/Xe-125 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/Xe-125 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/Xe-125 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/Xe-125 Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
1.52656e-05 |
1.716e+01 |
X-ray |
|
3.92520e-03 |
5.005e-02 |
X-ray |
|
4.21605e-03 |
2.905e-02 |
X-ray |
|
2.83065e-02 |
3.026e-01 |
X-ray |
|
2.86096e-02 |
5.617e-01 |
X-ray |
|
3.22368e-02 |
5.224e-02 |
X-ray |
|
3.22942e-02 |
1.013e-01 |
X-ray |
|
3.30185e-02 |
1.089e-02 |
X-ray |
|
3.30298e-02 |
2.131e-02 |
X-ray |
|
5.49680e-02 |
6.804e-02 |
Gamma |
|
1.88418e-01 |
5.400e-01 |
Gamma |
|
2.43378e-01 |
3.008e-01 |
Gamma |
|
4.53800e-01 |
4.687e-02 |
Gamma |
|
8.46510e-01 |
1.112e-02 |
Gamma |
|
2.70292e-05 |
2.575e+00 |
Auger electron |
|
2.89530e-05 |
8.272e+00 |
Auger electron |
|
1.25017e-04 |
9.498e-01 |
Auger electron |
|
3.07840e-04 |
1.852e-01 |
Auger electron |
|
4.77031e-04 |
2.201e+00 |
Auger electron |
|
5.78668e-04 |
1.048e-01 |
Auger electron |
|
3.20571e-03 |
8.633e-01 |
Auger electron |
|
3.84054e-03 |
2.551e-01 |
Auger electron |
|
4.49904e-03 |
1.858e-02 |
Auger electron |
|
2.18040e-02 |
2.509e-01 |
Conversion electron |
|
2.35598e-02 |
9.084e-02 |
Auger electron |
|
2.75866e-02 |
4.067e-02 |
Auger electron |
|
4.98061e-02 |
3.032e-02 |
Conversion electron |
|
1.55254e-01 |
6.316e-02 |
Conversion electron |
|
2.10214e-01 |
1.961e-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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