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Radionuclide Dosimetric Data Sheets
Curium-250
Summary data
General
Classification
Isotope: Cm-250
Atomic number (Z): 96
Mass number (A): 250
Neutron number (N): 154
Radioactive decay
Decay modes: α, β-, Spontaneus fission
Half-life: 8300.0 [y]
Decay constant: 2.6464e-12 [1/s]
Daughters: Pu-246 (18.0%), Bk-250 (8.0%), SF (74.0%)
Radioactive daughters: Pu-246, Bk-250
Dosimetric constants
Mean alpha energy: 0.9283 [MeV]
Mean electron energy: 8.42701 [MeV]
Mean photon energy: 13.3166 [MeV]
Air kerma rate constant, Γ10: 3.753e-19 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 1.441e-15 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 1.499e-12 [Gy·kg/Bq·s]
Equilibrium dose constant for alphas, Δα: 1.487e-13
[Gy·kg/Bq·s]
Equilibrium dose constant for betas/electrons, Δβ-,β+,e-:
1.350e-12 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 2.134e-12
[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-250 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-250 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-250 Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
7.20463e-05 |
4.457e-01 |
X-ray |
|
1.48000e-02 |
6.282e-02 |
Prompt gamma |
|
3.00000e-02 |
1.256e-01 |
Delayed gamma |
|
3.14000e-02 |
1.638e-01 |
Prompt gamma |
|
5.00000e-02 |
1.256e-01 |
Delayed gamma |
|
7.00000e-02 |
1.256e-01 |
Delayed gamma |
|
7.53000e-02 |
1.380e-02 |
Prompt gamma |
|
8.53000e-02 |
1.957e-02 |
Prompt gamma |
|
9.00000e-02 |
1.256e-01 |
Delayed gamma |
|
9.53000e-02 |
2.793e-02 |
Prompt gamma |
|
1.10000e-01 |
1.256e-01 |
Delayed gamma |
|
1.10000e-01 |
9.286e-02 |
Prompt gamma |
|
1.30000e-01 |
1.256e-01 |
Delayed gamma |
|
1.30000e-01 |
9.286e-02 |
Prompt gamma |
|
1.50000e-01 |
1.256e-01 |
Delayed gamma |
|
1.50000e-01 |
9.286e-02 |
Prompt gamma |
|
1.70000e-01 |
1.256e-01 |
Delayed gamma |
|
1.70000e-01 |
9.286e-02 |
Prompt gamma |
|
1.90000e-01 |
1.256e-01 |
Delayed gamma |
|
1.90000e-01 |
9.286e-02 |
Prompt gamma |
|
2.25000e-01 |
3.082e-01 |
Delayed gamma |
|
2.25000e-01 |
2.328e-01 |
Prompt gamma |
|
2.75000e-01 |
3.082e-01 |
Delayed gamma |
|
2.75000e-01 |
2.328e-01 |
Prompt gamma |
|
3.25000e-01 |
3.082e-01 |
Delayed gamma |
|
3.25000e-01 |
2.328e-01 |
Prompt gamma |
|
3.75000e-01 |
3.082e-01 |
Delayed gamma |
|
3.75000e-01 |
2.328e-01 |
Prompt gamma |
|
4.25000e-01 |
2.328e-01 |
Prompt gamma |
|
4.40000e-01 |
8.677e-01 |
Delayed gamma |
|
4.75000e-01 |
2.328e-01 |
Prompt gamma |
|
5.25000e-01 |
2.328e-01 |
Prompt gamma |
|
5.40000e-01 |
6.736e-01 |
Delayed gamma |
|
5.75000e-01 |
2.328e-01 |
Prompt gamma |
|
6.40000e-01 |
5.252e-01 |
Delayed gamma |
|
6.49000e-01 |
4.484e-01 |
Prompt gamma |
|
7.40000e-01 |
4.110e-01 |
Delayed gamma |
|
7.49000e-01 |
3.748e-01 |
Prompt gamma |
|
8.40000e-01 |
3.197e-01 |
Delayed gamma |
|
8.49000e-01 |
3.144e-01 |
Prompt gamma |
|
9.49000e-01 |
2.627e-01 |
Prompt gamma |
|
1.04900e+00 |
2.202e-01 |
Prompt gamma |
|
1.10000e+00 |
1.347e+00 |
Delayed gamma |
|
1.14900e+00 |
1.837e-01 |
Prompt gamma |
|
1.25000e+00 |
1.539e-01 |
Prompt gamma |
|
1.35000e+00 |
1.287e-01 |
Prompt gamma |
|
1.45000e+00 |
1.075e-01 |
Prompt gamma |
|
1.56000e+00 |
8.220e-01 |
Delayed gamma |
|
1.73000e+00 |
3.814e-01 |
Prompt gamma |
|
2.00000e+00 |
4.338e-01 |
Delayed gamma |
|
2.23000e+00 |
2.215e-01 |
Prompt gamma |
|
2.40000e+00 |
3.197e-01 |
Delayed gamma |
|
2.73000e+00 |
1.280e-01 |
Prompt gamma |
|
2.80000e+00 |
1.827e-01 |
Delayed gamma |
|
3.23000e+00 |
7.429e-02 |
Prompt gamma |
|
3.25000e+00 |
1.370e-01 |
Delayed gamma |
|
3.73000e+00 |
4.312e-02 |
Prompt gamma |
|
3.75000e+00 |
9.818e-02 |
Delayed gamma |
|
4.23000e+00 |
2.501e-02 |
Prompt gamma |
|
4.25000e+00 |
4.795e-02 |
Delayed gamma |
|
4.73000e+00 |
1.446e-02 |
Prompt gamma |
|
4.75000e+00 |
2.283e-02 |
Delayed gamma |
|
5.25000e+00 |
1.085e-02 |
Delayed gamma |
|
9.66027e-03 |
8.000e-02 |
Beta |
|
1.53066e+00 |
5.504e+00 |
Delayed beta |
|
8.91204e-05 |
1.220e-01 |
Auger electron |
|
1.91658e-04 |
6.960e-02 |
Auger electron |
|
2.37002e-04 |
1.169e-01 |
Auger electron |
|
5.74027e-04 |
1.806e-02 |
Auger electron |
|
2.56536e-03 |
3.826e-02 |
Auger electron |
|
2.36290e-02 |
1.728e-02 |
Conversion electron |
|
2.79290e-02 |
1.467e-02 |
Conversion electron |
|
5.04098e+00 |
4.500e-02 |
Alpha |
|
5.08624e+00 |
1.350e-01 |
Alpha |
|
8.20204e-02 |
4.500e-02 |
Alpha recoil |
|
8.27569e-02 |
1.350e-01 |
Alpha recoil |
|
9.06223e+01 |
1.480e+00 |
Fission fragment |
|
1.83480e+00 |
2.449e+00 |
Neutron |
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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