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Radionuclide Dosimetric Data Sheets
Americium-243
Summary data
General
Classification
Isotope: Am-243
Atomic number (Z): 95
Mass number (A): 243
Neutron number (N): 148
Radioactive decay
Decay modes: α
Half-life: 7370.0 [y]
Decay constant: 2.9803e-12 [1/s]
Daughters: Np-239 (100.0%)
Radioactive daughters: Np-239
Dosimetric constants
Mean alpha energy: 5.3583 [MeV]
Mean electron energy: 0.02337 [MeV]
Mean photon energy: 0.05852 [MeV]
Air kerma rate constant, Γ10: 6.452e-18 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 6.452e-18 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 8.622e-13 [Gy·kg/Bq·s]
Equilibrium dose constant for alphas, Δα: 8.585e-13
[Gy·kg/Bq·s]
Equilibrium dose constant for betas/electrons, Δβ-,β+,e-:
3.744e-15 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 9.376e-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-243 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-243 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-243 Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
7.44314e-05 |
6.019e+00 |
X-ray |
|
3.35033e-03 |
3.764e-02 |
X-ray |
|
1.39579e-02 |
7.516e-02 |
X-ray |
|
1.68587e-02 |
1.588e-02 |
X-ray |
|
1.70745e-02 |
1.031e-02 |
X-ray |
|
1.78428e-02 |
4.374e-02 |
X-ray |
|
4.35300e-02 |
5.933e-02 |
Gamma |
|
7.46600e-02 |
6.820e-01 |
Gamma |
|
7.89731e-05 |
1.763e+00 |
Auger electron |
|
1.70034e-04 |
1.048e-02 |
Auger electron |
|
1.90820e-04 |
9.154e-01 |
Auger electron |
|
2.09509e-04 |
1.582e+00 |
Auger electron |
|
5.79831e-04 |
2.555e-01 |
Auger electron |
|
1.62943e-03 |
1.521e-01 |
Auger electron |
|
2.49143e-03 |
5.145e-01 |
Auger electron |
|
2.99279e-03 |
1.007e-01 |
Auger electron |
|
8.70000e-03 |
8.121e-02 |
Conversion electron |
|
9.43800e-03 |
1.551e-02 |
Conversion electron |
|
1.05166e-02 |
1.200e-01 |
Auger electron |
|
1.39647e-02 |
6.164e-02 |
Auger electron |
|
2.06600e-02 |
2.620e-02 |
Conversion electron |
|
2.10900e-02 |
1.454e-02 |
Conversion electron |
|
2.13980e-02 |
2.900e-02 |
Conversion electron |
|
2.18280e-02 |
1.754e-02 |
Conversion electron |
|
2.54740e-02 |
2.326e-02 |
Conversion electron |
|
2.59040e-02 |
1.946e-02 |
Conversion electron |
|
2.67184e-02 |
2.577e-02 |
Conversion electron |
|
3.86784e-02 |
2.082e-02 |
Conversion electron |
|
3.91084e-02 |
1.303e-02 |
Conversion electron |
|
5.22200e-02 |
5.788e-02 |
Conversion electron |
|
5.29580e-02 |
4.430e-02 |
Conversion electron |
|
5.70340e-02 |
4.162e-02 |
Conversion electron |
|
7.02384e-02 |
3.564e-02 |
Conversion electron |
|
7.46600e-02 |
1.243e-02 |
Conversion electron |
|
5.17877e+00 |
1.102e-02 |
Alpha |
|
5.23322e+00 |
1.102e-01 |
Alpha |
|
5.27568e+00 |
8.758e-01 |
Alpha |
|
8.67303e-02 |
1.102e-02 |
Alpha recoil |
|
8.76422e-02 |
1.102e-01 |
Alpha recoil |
|
8.83534e-02 |
8.758e-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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