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Radionuclide Dosimetric Data Sheets
Curium-242
Summary data
General
Classification
Isotope: Cm-242
Atomic number (Z): 96
Mass number (A): 242
Neutron number (N): 146
Radioactive decay
Decay modes: α, Spontaneus fission
Half-life: 162.8 [d]
Decay constant: 4.9278e-08 [1/s]
Daughters: Pu-238 (100.0%), SF (6.37e-06%)
Radioactive daughters: Pu-238
Dosimetric constants
Mean alpha energy: 6.204 [MeV]
Mean electron energy: 0.00955 [MeV]
Mean photon energy: 0.00198 [MeV]
Air kerma rate constant, Γ10: 2.171e-18 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 2.171e-18 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 9.955e-13 [Gy·kg/Bq·s]
Equilibrium dose constant for alphas, Δα: 9.940e-13
[Gy·kg/Bq·s]
Equilibrium dose constant for betas/electrons, Δβ-,β+,e-:
1.530e-15 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 3.172e-16
[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-242 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-242 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-242 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-242 Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
7.20457e-05 |
2.575e+00 |
X-ray |
|
3.45651e-03 |
1.696e-02 |
X-ray |
|
1.42941e-02 |
3.474e-02 |
X-ray |
|
1.83932e-02 |
3.724e-02 |
X-ray |
|
8.91210e-05 |
7.049e-01 |
Auger electron |
|
1.91646e-04 |
4.021e-01 |
Auger electron |
|
2.36963e-04 |
6.758e-01 |
Auger electron |
|
5.73462e-04 |
1.043e-01 |
Auger electron |
|
1.47664e-03 |
2.392e-02 |
Auger electron |
|
2.56514e-03 |
2.211e-01 |
Auger electron |
|
3.09855e-03 |
4.540e-02 |
Auger electron |
|
1.07752e-02 |
5.474e-02 |
Auger electron |
|
1.43220e-02 |
2.841e-02 |
Auger electron |
|
2.17090e-02 |
9.923e-02 |
Conversion electron |
|
2.60090e-02 |
8.518e-02 |
Conversion electron |
|
3.95301e-02 |
5.254e-02 |
Conversion electron |
|
4.40800e-02 |
1.874e-02 |
Conversion electron |
|
6.06941e+00 |
2.591e-01 |
Alpha |
|
6.11276e+00 |
7.405e-01 |
Alpha |
|
1.02073e-01 |
2.591e-01 |
Alpha recoil |
|
1.02802e-01 |
7.405e-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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