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Radionuclide Dosimetric Data Sheets
Xenon-123
Summary data
General
Classification
Isotope: Xe-123
Atomic number (Z): 54
Mass number (A): 123
Neutron number (N): 69
Radioactive decay
Decay modes: β+, Electron capture
Half-life: 2.08 [h]
Decay constant: 9.2568e-05 [1/s]
Daughters: I-123 (100.0%)
Radioactive daughters: I-123
Dosimetric constants
Mean alpha energy: 0.0 [MeV]
Mean electron energy: 0.18749 [MeV]
Mean photon energy: 0.64106 [MeV]
Air kerma rate constant, Γ10: 1.758e-17 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 2.632e-17 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 3.004e-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-:
3.004e-14 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 1.027e-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/Xe-123 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-123 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-123 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-123 Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
1.52658e-05 |
1.242e+01 |
X-ray |
|
3.92520e-03 |
3.627e-02 |
X-ray |
|
4.21605e-03 |
2.125e-02 |
X-ray |
|
2.83065e-02 |
2.149e-01 |
X-ray |
|
2.86096e-02 |
3.990e-01 |
X-ray |
|
3.22368e-02 |
3.711e-02 |
X-ray |
|
3.22942e-02 |
7.196e-02 |
X-ray |
|
3.30298e-02 |
1.514e-02 |
X-ray |
|
1.48900e-01 |
4.890e-01 |
Gamma |
|
1.78100e-01 |
1.491e-01 |
Gamma |
|
3.30200e-01 |
8.557e-02 |
Gamma |
|
5.11000e-01 |
4.517e-01 |
Annihilation photon |
|
8.99600e-01 |
2.445e-02 |
Gamma |
|
1.09340e+00 |
2.787e-02 |
Gamma |
|
1.11310e+00 |
1.565e-02 |
Gamma |
|
1.80730e+00 |
1.247e-02 |
Gamma |
|
5.93331e-01 |
1.099e-02 |
Positron |
|
6.61317e-01 |
3.997e-02 |
Positron |
|
6.74348e-01 |
1.739e-01 |
Positron |
|
2.70196e-05 |
1.861e+00 |
Auger electron |
|
2.89513e-05 |
5.984e+00 |
Auger electron |
|
1.25058e-04 |
6.866e-01 |
Auger electron |
|
3.05676e-04 |
1.312e-01 |
Auger electron |
|
4.76979e-04 |
1.594e+00 |
Auger electron |
|
5.78503e-04 |
7.587e-02 |
Auger electron |
|
3.20492e-03 |
6.251e-01 |
Auger electron |
|
3.83959e-03 |
1.847e-01 |
Auger electron |
|
4.49780e-03 |
1.345e-02 |
Auger electron |
|
2.35598e-02 |
6.452e-02 |
Auger electron |
|
2.75866e-02 |
2.889e-02 |
Auger electron |
|
1.15736e-01 |
1.608e-01 |
Conversion electron |
|
1.43738e-01 |
1.571e-02 |
Conversion electron |
|
1.44043e-01 |
1.229e-02 |
Conversion electron |
|
1.44346e-01 |
1.283e-02 |
Conversion electron |
|
1.44936e-01 |
1.953e-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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