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Radionuclide Dosimetric Data Sheets
Americium-246
Summary data
General
Classification
Isotope: Am-246
Atomic number (Z): 95
Mass number (A): 246
Neutron number (N): 151
Radioactive decay
Decay modes: β-
Half-life: 39.0 [m]
Decay constant: 2.9622e-04 [1/s]
Daughters: Cm-246 (100.0%)
Radioactive daughters: Cm-246
Dosimetric constants
Mean alpha energy: 0.0 [MeV]
Mean electron energy: 0.72406 [MeV]
Mean photon energy: 0.74978 [MeV]
Air kerma rate constant, Γ10: 5.220e-17 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 5.220e-17 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 1.160e-13 [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-:
1.160e-13 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 1.201e-13
[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-246 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-246 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-246 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-246 Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
7.76610e-05 |
3.336e+01 |
X-ray |
|
3.66522e-03 |
2.354e-01 |
X-ray |
|
1.26809e-02 |
3.154e-02 |
X-ray |
|
1.47568e-02 |
4.859e-02 |
X-ray |
|
1.49784e-02 |
4.266e-01 |
X-ray |
|
1.74629e-02 |
1.600e-02 |
X-ray |
|
1.81285e-02 |
9.201e-02 |
X-ray |
|
1.88688e-02 |
1.858e-02 |
X-ray |
|
1.95388e-02 |
5.575e-01 |
X-ray |
|
2.28564e-02 |
1.309e-01 |
X-ray |
|
2.36395e-02 |
2.718e-02 |
X-ray |
|
9.92000e-02 |
4.770e-02 |
Gamma |
|
1.05084e-01 |
2.955e-02 |
X-ray |
|
1.09866e-01 |
4.624e-02 |
X-ray |
|
1.24031e-01 |
1.061e-02 |
X-ray |
|
1.27400e-01 |
3.180e-02 |
Gamma |
|
1.27400e-01 |
3.180e-02 |
Gamma |
|
1.53500e-01 |
2.544e-01 |
Gamma |
|
2.05000e-01 |
3.604e-01 |
Gamma |
|
6.29000e-01 |
2.650e-02 |
Gamma |
|
6.79000e-01 |
5.300e-01 |
Gamma |
|
6.86000e-01 |
2.120e-02 |
Gamma |
|
7.56000e-01 |
1.325e-01 |
Gamma |
|
7.81000e-01 |
3.975e-02 |
Gamma |
|
8.34000e-01 |
5.300e-02 |
Gamma |
|
8.39000e-01 |
2.120e-02 |
Gamma |
|
3.91092e-01 |
1.000e+00 |
Beta |
|
9.71111e-05 |
9.443e+00 |
Auger electron |
|
1.90623e-04 |
5.068e+00 |
Auger electron |
|
1.93246e-04 |
5.185e-02 |
Auger electron |
|
2.80745e-04 |
8.752e+00 |
Auger electron |
|
6.16096e-04 |
1.462e+00 |
Auger electron |
|
1.82418e-03 |
3.561e-01 |
Auger electron |
|
2.68283e-03 |
2.818e+00 |
Auger electron |
|
3.27828e-03 |
6.248e-01 |
Auger electron |
|
3.98921e-03 |
3.936e-02 |
Auger electron |
|
1.14514e-02 |
6.740e-01 |
Auger electron |
|
1.52382e-02 |
3.572e-01 |
Auger electron |
|
1.82960e-02 |
1.464e-02 |
Conversion electron |
|
1.90740e-02 |
3.852e-01 |
Conversion electron |
|
1.90756e-02 |
4.450e-02 |
Auger electron |
|
2.38560e-02 |
3.280e-01 |
Conversion electron |
|
2.46400e-02 |
4.450e-02 |
Conversion electron |
|
3.80210e-02 |
2.027e-01 |
Conversion electron |
|
4.28500e-02 |
7.560e-02 |
Conversion electron |
|
7.46460e-02 |
2.217e-02 |
Conversion electron |
|
7.54240e-02 |
4.016e-01 |
Conversion electron |
|
7.61400e-02 |
5.089e-02 |
Conversion electron |
|
8.02060e-02 |
2.562e-01 |
Conversion electron |
|
9.43710e-02 |
1.911e-01 |
Conversion electron |
|
9.92000e-02 |
7.179e-02 |
Conversion electron |
|
1.03624e-01 |
8.741e-02 |
Conversion electron |
|
1.03624e-01 |
8.741e-02 |
Conversion electron |
|
1.08406e-01 |
4.992e-02 |
Conversion electron |
|
1.08406e-01 |
4.992e-02 |
Conversion electron |
|
1.22571e-01 |
4.019e-02 |
Conversion electron |
|
1.22571e-01 |
4.019e-02 |
Conversion electron |
|
1.27400e-01 |
1.514e-02 |
Conversion electron |
|
1.27400e-01 |
1.514e-02 |
Conversion electron |
|
1.28946e-01 |
2.831e-02 |
Conversion electron |
|
1.29724e-01 |
3.083e-01 |
Conversion electron |
|
1.34506e-01 |
1.610e-01 |
Conversion electron |
|
1.48671e-01 |
1.387e-01 |
Conversion electron |
|
1.53500e-01 |
5.236e-02 |
Conversion electron |
|
1.80446e-01 |
1.822e-02 |
Conversion electron |
|
1.81224e-01 |
1.262e-01 |
Conversion electron |
|
1.86006e-01 |
5.615e-02 |
Conversion electron |
|
2.00171e-01 |
5.578e-02 |
Conversion electron |
|
2.05000e-01 |
2.107e-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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