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Radionuclide Dosimetric Data Sheets
Americium-242
Summary data
General
Classification
Isotope: Am-242
Atomic number (Z): 95
Mass number (A): 242
Neutron number (N): 147
Radioactive decay
Decay modes: β-, Electron capture
Half-life: 16.02 [h]
Decay constant: 1.2019e-05 [1/s]
Daughters: Cm-242 (82.7%), Pu-242 (17.3%)
Radioactive daughters: Cm-242, Pu-242
Dosimetric constants
Mean alpha energy: 0.0 [MeV]
Mean electron energy: 0.18061 [MeV]
Mean photon energy: 0.01881 [MeV]
Air kerma rate constant, Γ10: 6.366e-18 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 6.366e-18 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 2.894e-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-:
2.894e-14 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 3.014e-15
[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/Am-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/Am-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/Am-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/Am-242 Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
7.20051e-05 |
2.974e+00 |
X-ray |
|
7.76494e-05 |
4.395e+00 |
X-ray |
|
3.44878e-03 |
1.951e-02 |
X-ray |
|
3.66055e-03 |
3.103e-02 |
X-ray |
|
1.42941e-02 |
4.331e-02 |
X-ray |
|
1.49784e-02 |
6.184e-02 |
X-ray |
|
1.81285e-02 |
1.334e-02 |
X-ray |
|
1.83932e-02 |
3.173e-02 |
X-ray |
|
1.95388e-02 |
6.743e-02 |
X-ray |
|
2.28564e-02 |
1.584e-02 |
X-ray |
|
9.99790e-02 |
3.655e-02 |
X-ray |
|
1.04279e-01 |
5.786e-02 |
X-ray |
|
1.17801e-01 |
1.316e-02 |
X-ray |
|
1.85987e-01 |
4.548e-01 |
Beta |
|
2.00225e-01 |
3.721e-01 |
Beta |
|
8.90967e-05 |
8.152e-01 |
Auger electron |
|
9.71086e-05 |
1.244e+00 |
Auger electron |
|
1.90634e-04 |
6.655e-01 |
Auger electron |
|
1.91723e-04 |
4.605e-01 |
Auger electron |
|
2.36332e-04 |
7.808e-01 |
Auger electron |
|
2.79611e-04 |
1.153e+00 |
Auger electron |
|
5.70338e-04 |
1.208e-01 |
Auger electron |
|
6.00429e-04 |
1.908e-01 |
Auger electron |
|
1.66766e-03 |
4.256e-02 |
Auger electron |
|
1.79589e-03 |
3.952e-02 |
Auger electron |
|
2.55569e-03 |
2.556e-01 |
Auger electron |
|
2.67780e-03 |
3.730e-01 |
Auger electron |
|
3.08706e-03 |
5.236e-02 |
Auger electron |
|
3.27218e-03 |
8.263e-02 |
Auger electron |
|
1.06313e-02 |
6.386e-02 |
Auger electron |
|
1.12729e-02 |
9.103e-02 |
Auger electron |
|
1.41701e-02 |
3.310e-02 |
Auger electron |
|
1.50451e-02 |
4.817e-02 |
Auger electron |
|
1.83540e-02 |
1.729e-01 |
Conversion electron |
|
2.21690e-02 |
4.111e-02 |
Conversion electron |
|
2.31360e-02 |
1.494e-01 |
Conversion electron |
|
2.64690e-02 |
3.520e-02 |
Conversion electron |
|
3.73010e-02 |
9.207e-02 |
Conversion electron |
|
3.99901e-02 |
2.174e-02 |
Conversion electron |
|
4.21300e-02 |
3.433e-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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