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Radionuclide Dosimetric Data Sheets
Cerium-133
Summary data
General
Classification
Isotope: Ce-133
Atomic number (Z): 58
Mass number (A): 133
Neutron number (N): 75
Radioactive decay
Decay modes: β+, Electron capture
Half-life: 97.0 [m]
Decay constant: 1.1910e-04 [1/s]
Daughters: La-133 (100.0%)
Radioactive daughters: La-133
Dosimetric constants
Mean alpha energy: 0.0 [MeV]
Mean electron energy: 0.38169 [MeV]
Mean photon energy: 0.543 [MeV]
Air kerma rate constant, Γ10: 9.728e-18 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 2.405e-17 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 6.115e-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-:
6.115e-14 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 8.700e-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-133 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-133 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/Ce-133 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/Ce-133 Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
2.10724e-05 |
1.919e+01 |
X-ray |
|
7.27424e-04 |
1.056e-02 |
X-ray |
|
4.63652e-03 |
6.919e-02 |
X-ray |
|
5.03753e-03 |
4.133e-02 |
X-ray |
|
5.37004e-03 |
1.132e-02 |
X-ray |
|
3.30405e-02 |
3.432e-01 |
X-ray |
|
3.34591e-02 |
6.304e-01 |
X-ray |
|
3.77381e-02 |
6.076e-02 |
X-ray |
|
3.78203e-02 |
1.177e-01 |
X-ray |
|
3.87183e-02 |
1.289e-02 |
X-ray |
|
3.87359e-02 |
2.510e-02 |
X-ray |
|
7.69000e-02 |
1.575e-01 |
Gamma |
|
9.72610e-02 |
4.500e-01 |
Gamma |
|
5.11000e-01 |
7.400e-01 |
Annihilation photon |
|
5.57700e-01 |
1.125e-01 |
Gamma |
|
8.47296e-01 |
1.900e-01 |
Positron |
|
8.82083e-01 |
1.800e-01 |
Positron |
|
1.18532e-05 |
3.353e+00 |
Auger electron |
|
3.33700e-05 |
2.763e-02 |
Auger electron |
|
6.07180e-05 |
6.683e+00 |
Auger electron |
|
6.29255e-05 |
2.116e+00 |
Auger electron |
|
1.17795e-04 |
9.444e-01 |
Auger electron |
|
3.55016e-04 |
2.029e-01 |
Auger electron |
|
5.79543e-04 |
2.244e+00 |
Auger electron |
|
7.30026e-04 |
1.936e-01 |
Auger electron |
|
3.69645e-03 |
8.821e-01 |
Auger electron |
|
4.51004e-03 |
2.917e-01 |
Auger electron |
|
5.35472e-03 |
2.292e-02 |
Auger electron |
|
2.73123e-02 |
7.886e-02 |
Auger electron |
|
3.21336e-02 |
3.690e-02 |
Auger electron |
|
3.79570e-02 |
3.168e-01 |
Conversion electron |
|
5.83180e-02 |
4.645e-01 |
Conversion electron |
|
7.06582e-02 |
3.943e-02 |
Conversion electron |
|
9.10192e-02 |
5.734e-02 |
Conversion electron |
|
9.61383e-02 |
1.486e-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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