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Radionuclide Dosimetric Data Sheets
Curium-241
Summary data
General
Classification
Isotope: Cm-241
Atomic number (Z): 96
Mass number (A): 241
Neutron number (N): 145
Radioactive decay
Decay modes: α, Electron capture
Half-life: 32.8 [d]
Decay constant: 2.4459e-07 [1/s]
Daughters: Am-241 (99.0%), Pu-237 (1.0%)
Radioactive daughters: Am-241, Pu-237
Dosimetric constants
Mean alpha energy: 0.0603 [MeV]
Mean electron energy: 0.1342 [MeV]
Mean photon energy: 0.50338 [MeV]
Air kerma rate constant, Γ10: 3.710e-17 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 3.710e-17 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 3.116e-14 [Gy·kg/Bq·s]
Equilibrium dose constant for alphas, Δα: 9.661e-15
[Gy·kg/Bq·s]
Equilibrium dose constant for betas/electrons, Δβ-,β+,e-:
2.150e-14 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 8.065e-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/Cm-241 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/Cm-241 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-241 Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
7.21263e-05 |
3.024e+01 |
X-ray |
|
3.55458e-03 |
1.959e-01 |
X-ray |
|
5.30000e-03 |
1.070e-02 |
X-ray |
|
1.24249e-02 |
2.642e-02 |
X-ray |
|
1.44234e-02 |
4.142e-02 |
X-ray |
|
1.46345e-02 |
3.636e-01 |
X-ray |
|
1.77003e-02 |
7.790e-02 |
X-ray |
|
1.80853e-02 |
5.775e-02 |
X-ray |
|
1.84121e-02 |
1.541e-02 |
X-ray |
|
1.89584e-02 |
1.731e-01 |
X-ray |
|
1.91415e-02 |
4.609e-02 |
X-ray |
|
2.21841e-02 |
4.029e-02 |
X-ray |
|
2.23988e-02 |
1.578e-02 |
X-ray |
|
2.26800e-02 |
1.469e-02 |
X-ray |
|
1.02508e-01 |
2.337e-01 |
X-ray |
|
1.07043e-01 |
3.679e-01 |
X-ray |
|
1.19828e-01 |
4.278e-02 |
X-ray |
|
1.20885e-01 |
8.404e-02 |
X-ray |
|
1.24142e-01 |
1.081e-02 |
X-ray |
|
1.24423e-01 |
2.213e-02 |
X-ray |
|
1.32413e-01 |
3.861e-02 |
Gamma |
|
1.65049e-01 |
2.970e-02 |
Gamma |
|
2.05879e-01 |
2.673e-02 |
Gamma |
|
4.30634e-01 |
4.059e-02 |
Gamma |
|
4.63273e-01 |
1.228e-02 |
Gamma |
|
4.71805e-01 |
7.128e-01 |
Gamma |
|
6.36880e-01 |
1.534e-02 |
Gamma |
|
9.52033e-05 |
8.550e+00 |
Auger electron |
|
1.84063e-04 |
5.073e-02 |
Auger electron |
|
1.92644e-04 |
4.646e+00 |
Auger electron |
|
2.63461e-04 |
7.908e+00 |
Auger electron |
|
6.34823e-04 |
1.545e+00 |
Auger electron |
|
1.93659e-03 |
7.153e-01 |
Auger electron |
|
2.62073e-03 |
2.464e+00 |
Auger electron |
|
3.19117e-03 |
5.283e-01 |
Auger electron |
|
3.88164e-03 |
3.246e-02 |
Auger electron |
|
6.84300e-03 |
3.501e-01 |
Conversion electron |
|
8.81200e-03 |
2.504e-01 |
Conversion electron |
|
9.57700e-03 |
7.239e-02 |
Conversion electron |
|
1.05425e-02 |
1.928e-01 |
Conversion electron |
|
1.09675e-02 |
5.292e-01 |
Auger electron |
|
1.41120e-02 |
4.242e-02 |
Conversion electron |
|
1.46326e-02 |
2.770e-01 |
Auger electron |
|
1.52280e-02 |
7.066e-02 |
Conversion electron |
|
1.81140e-02 |
1.559e-02 |
Conversion electron |
|
1.83482e-02 |
3.406e-02 |
Auger electron |
|
2.26490e-02 |
1.267e-02 |
Conversion electron |
|
2.79535e-02 |
9.266e-02 |
Conversion electron |
|
3.26390e-02 |
3.384e-02 |
Conversion electron |
|
3.64905e-02 |
1.009e-02 |
Conversion electron |
|
3.94790e-02 |
1.460e-01 |
Conversion electron |
|
5.47070e-02 |
2.224e-02 |
Conversion electron |
|
8.09925e-02 |
1.510e-02 |
Auger electron |
|
1.08586e-01 |
6.273e-02 |
Conversion electron |
|
1.27727e-01 |
1.721e-02 |
Conversion electron |
|
1.40352e-01 |
1.925e-02 |
Conversion electron |
|
1.41222e-01 |
2.630e-02 |
Conversion electron |
|
3.46235e-01 |
1.283e-01 |
Conversion electron |
|
4.47978e-01 |
2.252e-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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