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Radionuclide Dosimetric Data Sheets
Americium-247
Summary data
General
Classification
Isotope: Am-247
Atomic number (Z): 95
Mass number (A): 247
Neutron number (N): 152
Radioactive decay
Decay modes: β-
Half-life: 23.0 [m]
Decay constant: 5.0228e-04 [1/s]
Daughters: Cm-247 (100.0%)
Radioactive daughters: Cm-247
Dosimetric constants
Mean alpha energy: 0.0 [MeV]
Mean electron energy: 0.56834 [MeV]
Mean photon energy: 0.1348 [MeV]
Air kerma rate constant, Γ10: 1.034e-17 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 1.034e-17 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 9.106e-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-:
9.106e-14 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 2.160e-14
[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/Am-247 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-247 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-247 Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
7.75750e-05 |
7.703e+00 |
X-ray |
|
3.64688e-03 |
5.391e-02 |
X-ray |
|
1.47568e-02 |
1.379e-02 |
X-ray |
|
1.49784e-02 |
1.211e-01 |
X-ray |
|
1.81285e-02 |
2.612e-02 |
X-ray |
|
1.86084e-02 |
1.009e-02 |
X-ray |
|
1.95388e-02 |
6.674e-02 |
X-ray |
|
2.28564e-02 |
1.568e-02 |
X-ray |
|
1.05084e-01 |
1.375e-01 |
X-ray |
|
1.09866e-01 |
2.151e-01 |
X-ray |
|
1.22914e-01 |
2.508e-02 |
X-ray |
|
1.24031e-01 |
4.937e-02 |
X-ray |
|
1.27666e-01 |
1.307e-02 |
X-ray |
|
2.26000e-01 |
5.669e-02 |
Gamma |
|
2.85000e-01 |
2.287e-01 |
Gamma |
|
4.42860e-01 |
2.427e-01 |
Beta |
|
4.64907e-01 |
6.990e-01 |
Beta |
|
5.22400e-01 |
5.825e-02 |
Beta |
|
9.70202e-05 |
2.186e+00 |
Auger electron |
|
1.91945e-04 |
1.144e+00 |
Auger electron |
|
1.92776e-04 |
1.200e-02 |
Auger electron |
|
2.78160e-04 |
2.024e+00 |
Auger electron |
|
5.95287e-04 |
3.385e-01 |
Auger electron |
|
2.04068e-03 |
1.366e-01 |
Auger electron |
|
2.66244e-03 |
6.543e-01 |
Auger electron |
|
3.25445e-03 |
1.446e-01 |
Auger electron |
|
1.10339e-02 |
1.614e-01 |
Auger electron |
|
1.47921e-02 |
8.524e-02 |
Auger electron |
|
1.85899e-02 |
1.055e-02 |
Auger electron |
|
9.71400e-02 |
4.605e-01 |
Conversion electron |
|
2.01446e-01 |
1.406e-01 |
Conversion electron |
|
2.02224e-01 |
2.012e-02 |
Conversion electron |
|
2.07006e-01 |
1.680e-02 |
Conversion electron |
|
2.21171e-01 |
4.707e-02 |
Conversion electron |
|
2.26000e-01 |
1.822e-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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