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Radionuclide Dosimetric Data Sheets
Xenon-138
Summary data
General
Classification
Isotope: Xe-138
Atomic number (Z): 54
Mass number (A): 138
Neutron number (N): 84
Radioactive decay
Decay modes: β-
Half-life: 14.08 [m]
Decay constant: 8.2049e-04 [1/s]
Daughters: Cs-138 (100.0%)
Radioactive daughters: Cs-138
Dosimetric constants
Mean alpha energy: 0.0 [MeV]
Mean electron energy: 0.65964 [MeV]
Mean photon energy: 1.12218 [MeV]
Air kerma rate constant, Γ10: 3.646e-17 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 3.646e-17 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 1.057e-13 [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-:
1.057e-13 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 1.798e-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-138 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-138 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-138 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-138 Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
2.18892e-05 |
1.199e+01 |
X-ray |
|
4.27313e-03 |
1.537e-02 |
X-ray |
|
4.61551e-03 |
1.221e-02 |
X-ray |
|
4.69420e-03 |
1.079e-02 |
X-ray |
|
3.06218e-02 |
1.210e-02 |
X-ray |
|
3.09789e-02 |
2.235e-02 |
X-ray |
|
1.53858e-01 |
5.953e-02 |
Gamma |
|
2.42560e-01 |
3.497e-02 |
Gamma |
|
2.58411e-01 |
3.150e-01 |
Gamma |
|
3.96513e-01 |
6.300e-02 |
Gamma |
|
4.01360e-01 |
2.174e-02 |
Gamma |
|
4.34562e-01 |
2.032e-01 |
Gamma |
|
1.11429e+00 |
1.474e-02 |
Gamma |
|
1.76826e+00 |
1.673e-01 |
Gamma |
|
1.85086e+00 |
1.424e-02 |
Gamma |
|
2.00475e+00 |
5.355e-02 |
Gamma |
|
2.01582e+00 |
1.225e-01 |
Gamma |
|
2.07917e+00 |
1.443e-02 |
Gamma |
|
2.25226e+00 |
2.287e-02 |
Gamma |
|
1.19221e-01 |
2.926e-02 |
Beta |
|
1.44821e-01 |
9.054e-02 |
Beta |
|
2.31293e-01 |
3.116e-01 |
Beta |
|
9.07824e-01 |
1.916e-01 |
Beta |
|
9.25163e-01 |
1.277e-01 |
Beta |
|
9.95407e-01 |
4.860e-02 |
Beta |
|
1.09881e+00 |
9.530e-02 |
Beta |
|
1.10693e+00 |
8.577e-02 |
Beta |
|
2.33143e-05 |
1.810e+00 |
Auger electron |
|
4.19656e-05 |
5.616e+00 |
Auger electron |
|
1.21035e-04 |
1.036e+00 |
Auger electron |
|
3.80800e-04 |
2.772e-01 |
Auger electron |
|
5.43515e-04 |
1.281e+00 |
Auger electron |
|
6.87953e-04 |
8.924e-02 |
Auger electron |
|
3.58614e-03 |
3.787e-01 |
Auger electron |
|
3.85932e-03 |
3.356e-01 |
Conversion electron |
|
4.32351e-03 |
1.183e-01 |
Auger electron |
|
4.85000e-03 |
8.768e-02 |
Conversion electron |
|
5.16510e-03 |
4.624e-01 |
Conversion electron |
|
5.48680e-03 |
4.220e-02 |
Conversion electron |
|
9.85932e-03 |
1.059e-01 |
Conversion electron |
|
1.08500e-02 |
2.758e-02 |
Conversion electron |
|
1.17873e-01 |
1.734e-02 |
Conversion electron |
|
2.22426e-01 |
1.799e-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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