<= Return to MIRDspec isotope database
Radionuclide Dosimetric Data Sheets
Americium-245
Summary data
General
Classification
Isotope: Am-245
Atomic number (Z): 95
Mass number (A): 245
Neutron number (N): 150
Radioactive decay
Decay modes: β-
Half-life: 2.05 [h]
Decay constant: 9.3922e-05 [1/s]
Daughters: Cm-245 (100.0%)
Radioactive daughters: Cm-245
Dosimetric constants
Mean alpha energy: 0.0 [MeV]
Mean electron energy: 0.28742 [MeV]
Mean photon energy: 0.03242 [MeV]
Air kerma rate constant, Γ10: 2.949e-18 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 2.949e-18 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 4.605e-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-:
4.605e-14 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 5.194e-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-245 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-245 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-245 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-245 Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
7.75668e-05 |
2.623e+00 |
X-ray |
|
3.64791e-03 |
1.824e-02 |
X-ray |
|
1.49784e-02 |
3.846e-02 |
X-ray |
|
1.95388e-02 |
1.969e-02 |
X-ray |
|
1.05084e-01 |
3.693e-02 |
X-ray |
|
1.09866e-01 |
5.780e-02 |
X-ray |
|
1.24031e-01 |
1.326e-02 |
X-ray |
|
2.52720e-01 |
6.018e-02 |
Gamma |
|
1.78047e-01 |
7.107e-02 |
Beta |
|
1.92463e-01 |
1.602e-01 |
Beta |
|
2.80409e-01 |
7.608e-01 |
Beta |
|
9.70012e-05 |
7.456e-01 |
Auger electron |
|
1.92406e-04 |
3.886e-01 |
Auger electron |
|
2.79071e-04 |
6.890e-01 |
Auger electron |
|
6.11330e-04 |
1.178e-01 |
Auger electron |
|
2.07272e-03 |
5.981e-02 |
Auger electron |
|
2.66361e-03 |
2.212e-01 |
Auger electron |
|
3.25664e-03 |
4.889e-02 |
Auger electron |
|
1.11361e-02 |
5.290e-02 |
Auger electron |
|
1.49060e-02 |
2.795e-02 |
Auger electron |
|
1.83260e-02 |
3.520e-02 |
Conversion electron |
|
3.54460e-02 |
1.339e-02 |
Conversion electron |
|
1.23860e-01 |
1.170e-01 |
Conversion electron |
|
2.28166e-01 |
2.099e-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)
<= Return to MIRDspec isotope database
