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Radionuclide Dosimetric Data Sheets
Curium-238
Summary data
General
Classification
Isotope: Cm-238
Atomic number (Z): 96
Mass number (A): 238
Neutron number (N): 142
Radioactive decay
Decay modes: α, Electron capture
Half-life: 2.4 [h]
Decay constant: 8.0225e-05 [1/s]
Daughters: Am-238 (96.2%), Pu-234 (3.84%)
Radioactive daughters: Am-238, Pu-234
Dosimetric constants
Mean alpha energy: 0.2537 [MeV]
Mean electron energy: 0.01165 [MeV]
Mean photon energy: 0.08287 [MeV]
Air kerma rate constant, Γ10: 1.082e-17 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 1.082e-17 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 4.251e-14 [Gy·kg/Bq·s]
Equilibrium dose constant for alphas, Δα: 4.065e-14
[Gy·kg/Bq·s]
Equilibrium dose constant for betas/electrons, Δβ-,β+,e-:
1.867e-15 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 1.328e-14
[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/Cm-238 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/Cm-238 Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
7.20463e-05 |
1.160e-01 |
X-ray |
|
7.21543e-05 |
1.043e+01 |
X-ray |
|
3.54500e-03 |
7.087e-02 |
X-ray |
|
1.24249e-02 |
1.182e-02 |
X-ray |
|
1.44234e-02 |
1.853e-02 |
X-ray |
|
1.46345e-02 |
1.627e-01 |
X-ray |
|
1.77003e-02 |
3.485e-02 |
X-ray |
|
1.80853e-02 |
1.139e-02 |
X-ray |
|
1.89584e-02 |
9.388e-02 |
X-ray |
|
2.21841e-02 |
2.186e-02 |
X-ray |
|
1.02508e-01 |
2.076e-01 |
X-ray |
|
1.07043e-01 |
3.268e-01 |
X-ray |
|
1.19828e-01 |
3.799e-02 |
X-ray |
|
1.20885e-01 |
7.464e-02 |
X-ray |
|
1.24423e-01 |
1.966e-02 |
X-ray |
|
8.91204e-05 |
3.175e-02 |
Auger electron |
|
9.52993e-05 |
2.922e+00 |
Auger electron |
|
1.83748e-04 |
1.740e-02 |
Auger electron |
|
1.90041e-04 |
1.611e+00 |
Auger electron |
|
1.91658e-04 |
1.811e-02 |
Auger electron |
|
2.37002e-04 |
3.044e-02 |
Auger electron |
|
2.58851e-04 |
2.740e+00 |
Auger electron |
|
5.78947e-04 |
4.457e-01 |
Auger electron |
|
1.87139e-03 |
1.738e-01 |
Auger electron |
|
2.60864e-03 |
8.934e-01 |
Auger electron |
|
3.17002e-03 |
1.905e-01 |
Auger electron |
|
3.84839e-03 |
1.164e-02 |
Auger electron |
|
1.07896e-02 |
2.238e-01 |
Auger electron |
|
1.44338e-02 |
1.170e-01 |
Auger electron |
|
1.81146e-02 |
1.436e-02 |
Auger electron |
|
8.09925e-02 |
1.341e-02 |
Auger electron |
|
6.46443e+00 |
1.171e-02 |
Alpha |
|
6.50965e+00 |
2.669e-02 |
Alpha |
|
1.10575e-01 |
1.171e-02 |
Alpha recoil |
|
1.11348e-01 |
2.669e-02 |
Alpha recoil |
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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