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Radionuclide Dosimetric Data Sheets
Curium-249
Summary data
General
Classification
Isotope: Cm-249
Atomic number (Z): 96
Mass number (A): 249
Neutron number (N): 153
Radioactive decay
Decay modes: β-
Half-life: 64.15 [m]
Decay constant: 1.8009e-04 [1/s]
Daughters: Bk-249 (100.0%)
Radioactive daughters: Bk-249
Dosimetric constants
Mean alpha energy: 0.0 [MeV]
Mean electron energy: 0.28352 [MeV]
Mean photon energy: 0.02 [MeV]
Air kerma rate constant, Γ10: 7.854e-19 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 7.854e-19 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 4.543e-14 [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-:
4.543e-14 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 3.204e-15
[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-249 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-249 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-249 Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
7.82242e-05 |
8.512e+00 |
X-ray |
|
3.80519e-03 |
4.659e-02 |
X-ray |
|
6.34310e-01 |
1.500e-02 |
Gamma |
|
7.03892e-02 |
1.892e-02 |
Beta |
|
9.24798e-02 |
1.036e-02 |
Beta |
|
2.78865e-01 |
9.610e-01 |
Beta |
|
1.03498e-04 |
2.458e+00 |
Auger electron |
|
2.00169e-04 |
1.245e-02 |
Auger electron |
|
2.01101e-04 |
1.343e+00 |
Auger electron |
|
3.18660e-04 |
2.185e+00 |
Auger electron |
|
6.52622e-04 |
8.206e-01 |
Auger electron |
|
2.80011e-03 |
5.462e-01 |
Auger electron |
|
3.48123e-03 |
1.316e-01 |
Auger electron |
|
3.83140e-03 |
7.213e-01 |
Conversion electron |
|
8.80000e-03 |
2.787e-01 |
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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