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Radionuclide Dosimetric Data Sheets
Americium-237
Summary data
General
Classification
Isotope: Am-237
Atomic number (Z): 95
Mass number (A): 237
Neutron number (N): 142
Radioactive decay
Decay modes: α, Electron capture
Half-life: 73.0 [m]
Decay constant: 1.5825e-04 [1/s]
Daughters: Pu-237 (100.0%), Np-233 (0.025%)
Radioactive daughters: Pu-237, Np-233
Dosimetric constants
Mean alpha energy: 0.0015 [MeV]
Mean electron energy: 0.08015 [MeV]
Mean photon energy: 0.37136 [MeV]
Air kerma rate constant, Γ10: 2.711e-17 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 2.711e-17 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 1.308e-14 [Gy·kg/Bq·s]
Equilibrium dose constant for alphas, Δα: 2.403e-16
[Gy·kg/Bq·s]
Equilibrium dose constant for betas/electrons, Δβ-,β+,e-:
1.284e-14 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 5.950e-14
[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-237 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-237 Summary 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-237 Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
7.19882e-05 |
1.967e+01 |
X-ray |
|
3.45417e-03 |
1.258e-01 |
X-ray |
|
1.21689e-02 |
1.820e-02 |
X-ray |
|
1.40932e-02 |
2.892e-02 |
X-ray |
|
1.42941e-02 |
2.540e-01 |
X-ray |
|
1.72768e-02 |
5.404e-02 |
X-ray |
|
1.75735e-02 |
1.625e-02 |
X-ray |
|
1.79611e-02 |
1.052e-02 |
X-ray |
|
1.83932e-02 |
1.803e-01 |
X-ray |
|
1.85721e-02 |
1.336e-02 |
X-ray |
|
2.15285e-02 |
4.162e-02 |
X-ray |
|
9.99790e-02 |
2.608e-01 |
X-ray |
|
1.04279e-01 |
4.128e-01 |
X-ray |
|
1.16802e-01 |
4.787e-02 |
X-ray |
|
1.17801e-01 |
9.391e-02 |
X-ray |
|
1.20980e-01 |
1.206e-02 |
X-ray |
|
1.21244e-01 |
2.458e-02 |
X-ray |
|
2.80230e-01 |
4.729e-01 |
Gamma |
|
3.21000e-01 |
1.400e-02 |
Gamma |
|
4.25800e-01 |
1.940e-02 |
Gamma |
|
4.38400e-01 |
8.298e-02 |
Gamma |
|
4.73500e-01 |
4.299e-02 |
Gamma |
|
6.55300e-01 |
1.300e-02 |
Gamma |
|
9.08800e-01 |
2.599e-02 |
Gamma |
|
8.90665e-05 |
5.415e+00 |
Auger electron |
|
1.76387e-04 |
3.406e-02 |
Auger electron |
|
1.92729e-04 |
3.045e+00 |
Auger electron |
|
2.38103e-04 |
5.153e+00 |
Auger electron |
|
5.91345e-04 |
8.899e-01 |
Auger electron |
|
1.69674e-03 |
2.900e-01 |
Auger electron |
|
2.37001e-03 |
3.412e-02 |
Conversion electron |
|
2.56320e-03 |
1.648e+00 |
Auger electron |
|
3.10016e-03 |
3.390e-01 |
Auger electron |
|
3.76457e-03 |
2.044e-02 |
Auger electron |
|
5.15001e-03 |
1.259e-02 |
Conversion electron |
|
5.35310e-03 |
1.618e-01 |
Conversion electron |
|
9.90300e-03 |
5.812e-02 |
Conversion electron |
|
1.06558e-02 |
3.775e-01 |
Auger electron |
|
1.41978e-02 |
1.957e-01 |
Auger electron |
|
1.76260e-02 |
1.504e-02 |
Conversion electron |
|
1.77787e-02 |
2.384e-02 |
Auger electron |
|
2.45880e-02 |
1.774e-02 |
Conversion electron |
|
3.32670e-02 |
2.148e-02 |
Conversion electron |
|
3.75670e-02 |
1.738e-02 |
Conversion electron |
|
4.64290e-02 |
1.195e-02 |
Conversion electron |
|
5.10881e-02 |
1.112e-02 |
Conversion electron |
|
5.59280e-02 |
1.614e-02 |
Conversion electron |
|
7.91086e-02 |
1.723e-02 |
Auger electron |
|
8.06800e-02 |
1.116e-02 |
Conversion electron |
|
1.23181e-01 |
1.179e-01 |
Conversion electron |
|
1.27481e-01 |
5.255e-02 |
Conversion electron |
|
1.41002e-01 |
5.431e-02 |
Conversion electron |
|
1.45552e-01 |
1.988e-02 |
Conversion electron |
|
1.57880e-01 |
1.812e-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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