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Radionuclide Dosimetric Data Sheets
Cerium-139
Summary data
General
Classification
Isotope: Ce-139
Atomic number (Z): 58
Mass number (A): 139
Neutron number (N): 81
Radioactive decay
Decay modes: Electron capture
Half-life: 137.6 [d]
Decay constant: 5.8286e-08 [1/s]
Daughters: La-139 (100.0%)
Radioactive daughters: None
Dosimetric constants
Mean alpha energy: 0.0 [MeV]
Mean electron energy: 0.0355 [MeV]
Mean photon energy: 0.15992 [MeV]
Air kerma rate constant, Γ10: 8.054e-18 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 8.054e-18 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 5.688e-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-:
5.688e-15 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 2.562e-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/Ce-139 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/Ce-139 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/Ce-139 Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
2.10685e-05 |
1.504e+01 |
X-ray |
|
4.63652e-03 |
5.036e-02 |
X-ray |
|
5.03753e-03 |
3.030e-02 |
X-ray |
|
3.30405e-02 |
2.354e-01 |
X-ray |
|
3.34591e-02 |
4.322e-01 |
X-ray |
|
3.77381e-02 |
4.166e-02 |
X-ray |
|
3.78202e-02 |
8.071e-02 |
X-ray |
|
3.87359e-02 |
1.721e-02 |
X-ray |
|
1.65858e-01 |
7.894e-01 |
Gamma |
|
1.18532e-05 |
2.632e+00 |
Auger electron |
|
3.33700e-05 |
2.168e-02 |
Auger electron |
|
6.08141e-05 |
5.223e+00 |
Auger electron |
|
6.28355e-05 |
1.682e+00 |
Auger electron |
|
1.17533e-04 |
7.659e-01 |
Auger electron |
|
3.72414e-04 |
2.032e-01 |
Auger electron |
|
5.80587e-04 |
1.722e+00 |
Auger electron |
|
7.32452e-04 |
1.490e-01 |
Auger electron |
|
3.71616e-03 |
6.740e-01 |
Auger electron |
|
4.53232e-03 |
2.232e-01 |
Auger electron |
|
5.38186e-03 |
1.762e-02 |
Auger electron |
|
2.73123e-02 |
5.407e-02 |
Auger electron |
|
3.21336e-02 |
2.530e-02 |
Auger electron |
|
1.26915e-01 |
1.799e-01 |
Conversion electron |
|
1.59616e-01 |
2.239e-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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