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Radionuclide Dosimetric Data Sheets
Fermium-253
Summary data
General
Classification
Isotope: Fm-253
Atomic number (Z): 100
Mass number (A): 253
Neutron number (N): 153
Radioactive decay
Decay modes: α, Electron capture
Half-life: 3.0 [d]
Decay constant: 2.6742e-06 [1/s]
Daughters: Es-253 (88.0%), Cf-249 (12.0%)
Radioactive daughters: Es-253, Cf-249
Dosimetric constants
Mean alpha energy: 0.8351 [MeV]
Mean electron energy: 0.10842 [MeV]
Mean photon energy: 0.07129 [MeV]
Air kerma rate constant, Γ10: 1.474e-17 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 1.474e-17 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 1.512e-13 [Gy·kg/Bq·s]
Equilibrium dose constant for alphas, Δα: 1.338e-13
[Gy·kg/Bq·s]
Equilibrium dose constant for betas/electrons, Δβ-,β+,e-:
1.737e-14 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 1.142e-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/Fm-253 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/Fm-253 Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
7.45568e-05 |
1.482e+00 |
X-ray |
|
7.54730e-05 |
1.962e+01 |
X-ray |
|
3.85976e-03 |
1.109e-02 |
X-ray |
|
3.96446e-03 |
1.472e-01 |
X-ray |
|
6.41499e-03 |
1.430e-02 |
X-ray |
|
1.34559e-02 |
2.147e-02 |
X-ray |
|
1.56809e-02 |
2.275e-02 |
X-ray |
|
1.57835e-02 |
3.146e-02 |
X-ray |
|
1.60394e-02 |
2.760e-01 |
X-ray |
|
1.94489e-02 |
6.066e-02 |
X-ray |
|
2.02594e-02 |
6.198e-02 |
X-ray |
|
2.02746e-02 |
1.261e-02 |
X-ray |
|
2.07498e-02 |
1.486e-02 |
X-ray |
|
2.13815e-02 |
9.204e-02 |
X-ray |
|
2.15768e-02 |
4.342e-02 |
X-ray |
|
2.49830e-02 |
2.219e-02 |
X-ray |
|
2.51504e-02 |
1.714e-02 |
X-ray |
|
2.55081e-02 |
1.440e-02 |
X-ray |
|
1.06000e-01 |
1.294e-02 |
Gamma |
|
1.10388e-01 |
1.958e-02 |
X-ray |
|
1.13103e-01 |
9.588e-02 |
X-ray |
|
1.15701e-01 |
3.030e-02 |
X-ray |
|
1.18701e-01 |
1.475e-01 |
X-ray |
|
1.32545e-01 |
1.730e-02 |
X-ray |
|
1.33863e-01 |
3.427e-02 |
X-ray |
|
2.71800e-01 |
2.640e-02 |
Gamma |
|
1.14385e-04 |
4.017e-01 |
Auger electron |
|
1.20837e-04 |
5.272e+00 |
Auger electron |
|
1.92701e-04 |
2.391e-01 |
Auger electron |
|
1.93488e-04 |
3.162e+00 |
Auger electron |
|
2.23423e-04 |
2.206e-02 |
Auger electron |
|
3.34180e-04 |
3.926e-01 |
Auger electron |
|
3.64893e-04 |
5.204e+00 |
Auger electron |
|
6.49591e-04 |
7.082e-02 |
Auger electron |
|
7.03380e-04 |
1.042e+00 |
Auger electron |
|
2.32755e-03 |
2.734e-02 |
Auger electron |
|
2.62792e-03 |
5.630e-01 |
Auger electron |
|
2.79228e-03 |
1.245e-01 |
Auger electron |
|
2.85153e-03 |
1.601e+00 |
Auger electron |
|
3.45336e-03 |
2.994e-02 |
Auger electron |
|
3.55028e-03 |
4.007e-01 |
Auger electron |
|
4.33502e-03 |
2.662e-02 |
Auger electron |
|
9.17001e-03 |
6.384e-02 |
Conversion electron |
|
1.16471e-02 |
2.957e-02 |
Auger electron |
|
1.19858e-02 |
3.529e-01 |
Auger electron |
|
1.56469e-02 |
1.589e-02 |
Auger electron |
|
1.61200e-02 |
1.912e-01 |
Auger electron |
|
2.03199e-02 |
2.427e-02 |
Auger electron |
|
7.91760e-02 |
4.543e-01 |
Conversion electron |
|
7.99930e-02 |
4.721e-02 |
Conversion electron |
|
8.55910e-02 |
1.188e-01 |
Conversion electron |
|
1.00753e-01 |
1.780e-01 |
Conversion electron |
|
1.06000e-01 |
6.868e-02 |
Conversion electron |
|
1.18753e-01 |
2.781e-02 |
Conversion electron |
|
1.19558e-01 |
1.217e-02 |
Conversion electron |
|
1.39696e-01 |
1.412e-02 |
Conversion electron |
|
6.67294e+00 |
2.790e-02 |
Alpha |
|
6.84386e+00 |
1.010e-02 |
Alpha |
|
6.89814e+00 |
1.178e-02 |
Alpha |
|
6.94045e+00 |
5.134e-02 |
Alpha |
|
1.07265e-01 |
2.790e-02 |
Alpha recoil |
|
1.10013e-01 |
1.010e-02 |
Alpha recoil |
|
1.10886e-01 |
1.178e-02 |
Alpha recoil |
|
1.11566e-01 |
5.134e-02 |
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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