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Radionuclide Dosimetric Data Sheets
Cerium-135
Summary data
General
Classification
Isotope: Ce-135
Atomic number (Z): 58
Mass number (A): 135
Neutron number (N): 77
Radioactive decay
Decay modes: β+, Electron capture
Half-life: 17.7 [h]
Decay constant: 1.0878e-05 [1/s]
Daughters: La-135 (100.0%)
Radioactive daughters: La-135
Dosimetric constants
Mean alpha energy: 0.0 [MeV]
Mean electron energy: 0.02959 [MeV]
Mean photon energy: 0.82366 [MeV]
Air kerma rate constant, Γ10: 3.306e-17 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 3.320e-17 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 4.741e-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-:
4.741e-15 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 1.320e-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/Ce-135 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-135 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-135 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-135 Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
2.10706e-05 |
1.435e+01 |
X-ray |
|
4.63652e-03 |
5.004e-02 |
X-ray |
|
5.03753e-03 |
3.002e-02 |
X-ray |
|
3.30405e-02 |
2.417e-01 |
X-ray |
|
3.34591e-02 |
4.438e-01 |
X-ray |
|
3.45080e-02 |
1.630e-02 |
Gamma |
|
3.77381e-02 |
4.278e-02 |
X-ray |
|
3.78202e-02 |
8.287e-02 |
X-ray |
|
3.87359e-02 |
1.767e-02 |
X-ray |
|
1.19520e-01 |
1.296e-02 |
Gamma |
|
2.06500e-01 |
7.775e-02 |
Gamma |
|
2.65560e-01 |
4.180e-01 |
Gamma |
|
2.99110e-01 |
1.254e-02 |
Gamma |
|
3.00070e-01 |
2.353e-01 |
Gamma |
|
3.79790e-01 |
1.547e-02 |
Gamma |
|
4.83580e-01 |
1.860e-02 |
Gamma |
|
5.18050e-01 |
1.363e-01 |
Gamma |
|
5.72260e-01 |
1.037e-01 |
Gamma |
|
5.77090e-01 |
5.141e-02 |
Gamma |
|
6.04560e-01 |
2.801e-02 |
Gamma |
|
6.06760e-01 |
1.881e-01 |
Gamma |
|
6.65790e-01 |
3.010e-02 |
Gamma |
|
7.83590e-01 |
1.062e-01 |
Gamma |
|
8.28380e-01 |
5.141e-02 |
Gamma |
|
8.71350e-01 |
3.302e-02 |
Gamma |
|
9.05870e-01 |
1.609e-02 |
Gamma |
|
1.18409e+00 |
1.087e-02 |
Gamma |
|
1.18532e-05 |
2.509e+00 |
Auger electron |
|
3.33700e-05 |
2.068e-02 |
Auger electron |
|
6.07608e-05 |
4.992e+00 |
Auger electron |
|
6.28853e-05 |
1.592e+00 |
Auger electron |
|
1.17682e-04 |
7.165e-01 |
Auger electron |
|
3.64382e-04 |
1.722e-01 |
Auger electron |
|
5.79988e-04 |
1.662e+00 |
Auger electron |
|
7.31065e-04 |
1.436e-01 |
Auger electron |
|
3.70583e-03 |
6.528e-01 |
Auger electron |
|
4.52065e-03 |
2.160e-01 |
Auger electron |
|
5.36766e-03 |
1.701e-02 |
Auger electron |
|
2.73123e-02 |
5.552e-02 |
Auger electron |
|
2.82662e-02 |
4.264e-02 |
Conversion electron |
|
3.21336e-02 |
2.598e-02 |
Auger electron |
|
2.26617e-01 |
2.645e-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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