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Radionuclide Dosimetric Data Sheets
Cerium-137
Summary data
General
Classification
Isotope: Ce-137
Atomic number (Z): 58
Mass number (A): 137
Neutron number (N): 79
Radioactive decay
Decay modes: β+, Electron capture
Half-life: 9.0 [h]
Decay constant: 2.1393e-05 [1/s]
Daughters: La-137 (100.0%)
Radioactive daughters: La-137
Dosimetric constants
Mean alpha energy: 0.0 [MeV]
Mean electron energy: 0.01648 [MeV]
Mean photon energy: 0.03882 [MeV]
Air kerma rate constant, Γ10: 4.378e-18 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 4.381e-18 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 2.640e-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-:
2.640e-15 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 6.220e-15
[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-137 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-137 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-137 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-137 Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
2.10570e-05 |
2.503e+01 |
X-ray |
|
7.33264e-04 |
1.292e-02 |
X-ray |
|
4.63652e-03 |
6.635e-02 |
X-ray |
|
5.03700e-03 |
1.396e-02 |
X-ray |
|
5.03753e-03 |
4.482e-02 |
X-ray |
|
5.11912e-03 |
2.141e-02 |
X-ray |
|
5.37004e-03 |
1.085e-02 |
X-ray |
|
3.30405e-02 |
2.203e-01 |
X-ray |
|
3.34591e-02 |
4.046e-01 |
X-ray |
|
3.77381e-02 |
3.900e-02 |
X-ray |
|
3.78203e-02 |
7.555e-02 |
X-ray |
|
3.87359e-02 |
1.611e-02 |
X-ray |
|
4.47150e-01 |
1.780e-02 |
Gamma |
|
1.18532e-05 |
4.397e+00 |
Auger electron |
|
3.33700e-05 |
3.623e-02 |
Auger electron |
|
6.10334e-05 |
8.637e+00 |
Auger electron |
|
6.26588e-05 |
2.877e+00 |
Auger electron |
|
1.17352e-04 |
1.358e+00 |
Auger electron |
|
3.93580e-04 |
5.417e-01 |
Auger electron |
|
5.83026e-04 |
2.718e+00 |
Auger electron |
|
7.38010e-04 |
2.370e-01 |
Auger electron |
|
3.77754e-03 |
1.063e+00 |
Auger electron |
|
4.36820e-03 |
6.909e-01 |
Conversion electron |
|
4.60083e-03 |
3.539e-01 |
Auger electron |
|
4.70750e-03 |
6.364e-02 |
Conversion electron |
|
5.12620e-03 |
1.426e-02 |
Conversion electron |
|
5.46297e-03 |
2.831e-02 |
Auger electron |
|
9.48730e-03 |
1.604e-01 |
Conversion electron |
|
1.06100e-02 |
4.433e-02 |
Conversion electron |
|
2.73123e-02 |
5.061e-02 |
Auger electron |
|
3.21336e-02 |
2.368e-02 |
Auger 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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