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Radionuclide Dosimetric Data Sheets
Cerium-131
Summary data
General
Classification
Isotope: Ce-131
Atomic number (Z): 58
Mass number (A): 131
Neutron number (N): 73
Radioactive decay
Decay modes: β+, Electron capture
Half-life: 10.2 [m]
Decay constant: 1.1326e-03 [1/s]
Daughters: La-131 (100.0%)
Radioactive daughters: La-131
Dosimetric constants
Mean alpha energy: 0.0 [MeV]
Mean electron energy: 0.61533 [MeV]
Mean photon energy: 1.62671 [MeV]
Air kerma rate constant, Γ10: 4.202e-17 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 6.066e-17 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 9.859e-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-:
9.859e-14 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 2.606e-13
[Gy·kg/Bq·s]
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-131 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-131 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-131 Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
2.10581e-05 |
1.879e+01 |
X-ray |
|
4.63652e-03 |
5.096e-02 |
X-ray |
|
5.03753e-03 |
3.450e-02 |
X-ray |
|
5.11912e-03 |
1.521e-02 |
X-ray |
|
2.62000e-02 |
9.546e-02 |
Gamma |
|
3.30405e-02 |
1.553e-01 |
X-ray |
|
3.34591e-02 |
2.851e-01 |
X-ray |
|
3.77381e-02 |
2.748e-02 |
X-ray |
|
3.78202e-02 |
5.324e-02 |
X-ray |
|
3.87359e-02 |
1.135e-02 |
X-ray |
|
1.19180e-01 |
9.768e-02 |
Gamma |
|
1.45410e-01 |
2.042e-02 |
Gamma |
|
1.69420e-01 |
2.220e-01 |
Gamma |
|
2.44850e-01 |
5.328e-02 |
Gamma |
|
2.64200e-01 |
1.776e-02 |
Gamma |
|
2.71600e-01 |
2.664e-02 |
Gamma |
|
3.03000e-01 |
1.154e-02 |
Gamma |
|
3.26900e-01 |
1.221e-02 |
Gamma |
|
3.90800e-01 |
1.332e-02 |
Gamma |
|
3.92500e-01 |
3.330e-02 |
Gamma |
|
3.95280e-01 |
7.770e-02 |
Gamma |
|
4.03600e-01 |
1.865e-02 |
Gamma |
|
4.14250e-01 |
1.510e-01 |
Gamma |
|
4.21490e-01 |
2.908e-02 |
Gamma |
|
4.33700e-01 |
2.575e-02 |
Gamma |
|
4.42740e-01 |
3.552e-02 |
Gamma |
|
4.75860e-01 |
3.996e-02 |
Gamma |
|
5.11000e-01 |
9.634e-01 |
Annihilation photon |
|
5.47930e-01 |
2.620e-02 |
Gamma |
|
5.83800e-01 |
2.242e-02 |
Gamma |
|
5.98500e-01 |
2.620e-02 |
Gamma |
|
6.02870e-01 |
3.330e-02 |
Gamma |
|
6.07600e-01 |
1.709e-02 |
Gamma |
|
6.14600e-01 |
1.177e-02 |
Gamma |
|
6.34930e-01 |
1.110e-02 |
Gamma |
|
6.44700e-01 |
1.177e-02 |
Gamma |
|
6.57240e-01 |
1.598e-02 |
Gamma |
|
7.50600e-01 |
1.554e-02 |
Gamma |
|
8.35800e-01 |
5.328e-02 |
Gamma |
|
8.66400e-01 |
1.954e-02 |
Gamma |
|
8.86100e-01 |
3.130e-02 |
Gamma |
|
9.11300e-01 |
1.088e-02 |
Gamma |
|
9.64900e-01 |
1.687e-02 |
Gamma |
|
1.06060e+00 |
1.399e-02 |
Gamma |
|
1.13120e+00 |
1.510e-02 |
Gamma |
|
1.16680e+00 |
2.309e-02 |
Gamma |
|
1.23870e+00 |
1.443e-02 |
Gamma |
|
1.30240e+00 |
1.776e-02 |
Gamma |
|
1.35760e+00 |
1.066e-02 |
Gamma |
|
1.44940e+00 |
1.310e-02 |
Gamma |
|
1.46968e+00 |
7.326e-02 |
Gamma |
|
1.48850e+00 |
1.976e-02 |
Gamma |
|
1.69420e+00 |
2.242e-02 |
Gamma |
|
1.77450e+00 |
1.709e-02 |
Gamma |
|
5.04863e-01 |
1.412e-02 |
Positron |
|
9.01518e-01 |
1.714e-02 |
Positron |
|
9.52964e-01 |
1.513e-02 |
Positron |
|
1.02938e+00 |
3.529e-02 |
Positron |
|
1.10053e+00 |
4.437e-02 |
Positron |
|
1.15948e+00 |
3.025e-02 |
Positron |
|
1.16840e+00 |
4.235e-02 |
Positron |
|
1.17715e+00 |
3.428e-02 |
Positron |
|
1.28139e+00 |
5.849e-02 |
Positron |
|
1.30464e+00 |
8.168e-02 |
Positron |
|
1.35989e+00 |
9.075e-02 |
Positron |
|
1.18532e-05 |
3.299e+00 |
Auger electron |
|
3.33700e-05 |
2.719e-02 |
Auger electron |
|
6.10075e-05 |
6.489e+00 |
Auger electron |
|
6.26841e-05 |
2.153e+00 |
Auger electron |
|
1.17461e-04 |
1.013e+00 |
Auger electron |
|
3.91759e-04 |
3.900e-01 |
Auger electron |
|
5.82744e-04 |
2.053e+00 |
Auger electron |
|
7.37342e-04 |
1.788e-01 |
Auger electron |
|
3.77139e-03 |
8.026e-01 |
Auger electron |
|
4.59391e-03 |
2.670e-01 |
Auger electron |
|
5.45473e-03 |
2.132e-02 |
Auger electron |
|
1.99582e-02 |
4.959e-01 |
Conversion electron |
|
2.02975e-02 |
7.484e-02 |
Conversion electron |
|
2.07162e-02 |
5.518e-02 |
Conversion electron |
|
2.50773e-02 |
1.313e-01 |
Conversion electron |
|
2.62000e-02 |
3.600e-02 |
Conversion electron |
|
2.73123e-02 |
3.567e-02 |
Auger electron |
|
3.21336e-02 |
1.669e-02 |
Auger electron |
|
8.02370e-02 |
7.252e-02 |
Conversion electron |
|
1.30477e-01 |
5.310e-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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