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Radionuclide Dosimetric Data Sheets
Xenon-122
Summary data
General
Classification
Isotope: Xe-122
Atomic number (Z): 54
Mass number (A): 122
Neutron number (N): 68
Radioactive decay
Decay modes: Electron capture
Half-life: 20.1 [h]
Decay constant: 9.5791e-06 [1/s]
Daughters: I-122 (100.0%)
Radioactive daughters: I-122
Dosimetric constants
Mean alpha energy: 0.0 [MeV]
Mean electron energy: 0.01 [MeV]
Mean photon energy: 0.06839 [MeV]
Air kerma rate constant, Γ10: 6.532e-18 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 6.532e-18 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 1.602e-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-:
1.602e-15 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 1.096e-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-122 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-122 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/Xe-122 Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
1.52654e-05 |
1.286e+01 |
X-ray |
|
3.92520e-03 |
3.726e-02 |
X-ray |
|
4.21605e-03 |
2.157e-02 |
X-ray |
|
2.83065e-02 |
2.246e-01 |
X-ray |
|
2.86096e-02 |
4.170e-01 |
X-ray |
|
3.22368e-02 |
3.878e-02 |
X-ray |
|
3.22942e-02 |
7.521e-02 |
X-ray |
|
3.30298e-02 |
1.582e-02 |
X-ray |
|
1.48612e-01 |
2.621e-02 |
Gamma |
|
3.50065e-01 |
7.800e-02 |
Gamma |
|
4.16633e-01 |
1.872e-02 |
Gamma |
|
2.70442e-05 |
1.931e+00 |
Auger electron |
|
2.89556e-05 |
6.195e+00 |
Auger electron |
|
1.25012e-04 |
7.128e-01 |
Auger electron |
|
3.09957e-04 |
1.421e-01 |
Auger electron |
|
4.77122e-04 |
1.645e+00 |
Auger electron |
|
5.78924e-04 |
7.835e-02 |
Auger electron |
|
3.20701e-03 |
6.450e-01 |
Auger electron |
|
3.84204e-03 |
1.906e-01 |
Auger electron |
|
4.50089e-03 |
1.389e-02 |
Auger electron |
|
2.35598e-02 |
6.744e-02 |
Auger electron |
|
2.75866e-02 |
3.019e-02 |
Auger electron |
|
2.84620e-02 |
1.073e-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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