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Radionuclide Dosimetric Data Sheets
Curium-240
Summary data
General
Classification
Isotope: Cm-240
Atomic number (Z): 96
Mass number (A): 240
Neutron number (N): 144
Radioactive decay
Decay modes: α, Spontaneus fission
Half-life: 27.0 [d]
Decay constant: 2.9713e-07 [1/s]
Daughters: Pu-236 (99.7%), SF (3.9e-06%)
Radioactive daughters: Pu-236
Dosimetric constants
Mean alpha energy: 6.365 [MeV]
Mean electron energy: 0.01081 [MeV]
Mean photon energy: 0.00221 [MeV]
Air kerma rate constant, Γ10: 2.416e-18 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 2.416e-18 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 1.022e-12 [Gy·kg/Bq·s]
Equilibrium dose constant for alphas, Δα: 1.020e-12
[Gy·kg/Bq·s]
Equilibrium dose constant for betas/electrons, Δβ-,β+,e-:
1.732e-15 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 3.541e-16
[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-240 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/Cm-240 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/Cm-240 Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
7.20459e-05 |
2.868e+00 |
X-ray |
|
3.45658e-03 |
1.889e-02 |
X-ray |
|
1.42941e-02 |
3.864e-02 |
X-ray |
|
1.83932e-02 |
4.152e-02 |
X-ray |
|
8.91208e-05 |
7.849e-01 |
Auger electron |
|
1.91650e-04 |
4.477e-01 |
Auger electron |
|
2.36975e-04 |
7.524e-01 |
Auger electron |
|
5.73646e-04 |
1.161e-01 |
Auger electron |
|
1.47677e-03 |
2.668e-02 |
Auger electron |
|
2.56521e-03 |
2.462e-01 |
Auger electron |
|
3.09864e-03 |
5.055e-02 |
Auger electron |
|
1.07773e-02 |
6.093e-02 |
Auger electron |
|
1.43243e-02 |
3.162e-02 |
Auger electron |
|
2.22590e-02 |
1.105e-01 |
Conversion electron |
|
2.65590e-02 |
9.458e-02 |
Conversion electron |
|
4.00801e-02 |
5.844e-02 |
Conversion electron |
|
4.46300e-02 |
2.085e-02 |
Conversion electron |
|
6.24663e+00 |
2.879e-01 |
Alpha |
|
6.29051e+00 |
7.084e-01 |
Alpha |
|
1.05944e-01 |
2.879e-01 |
Alpha recoil |
|
1.06688e-01 |
7.084e-01 |
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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