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Radionuclide Dosimetric Data Sheets
Fermium-254
Summary data
General
Classification
Isotope: Fm-254
Atomic number (Z): 100
Mass number (A): 254
Neutron number (N): 154
Radioactive decay
Decay modes: α, Spontaneus fission
Half-life: 3.24 [h]
Decay constant: 5.9426e-05 [1/s]
Daughters: Cf-250 (99.9%), SF (0.0592%)
Radioactive daughters: Cf-250
Dosimetric constants
Mean alpha energy: 7.2956 [MeV]
Mean electron energy: 0.00948 [MeV]
Mean photon energy: 0.0086 [MeV]
Air kerma rate constant, Γ10: 1.244e-18 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 2.527e-18 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 1.170e-12 [Gy·kg/Bq·s]
Equilibrium dose constant for alphas, Δα: 1.169e-12
[Gy·kg/Bq·s]
Equilibrium dose constant for betas/electrons, Δβ-,β+,e-:
1.519e-15 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 1.378e-15
[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-254 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/Fm-254 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/Fm-254 Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
7.45993e-05 |
1.662e+00 |
X-ray |
|
3.87092e-03 |
1.260e-02 |
X-ray |
|
1.56809e-02 |
2.401e-02 |
X-ray |
|
2.07498e-02 |
2.724e-02 |
X-ray |
|
1.14522e-04 |
4.490e-01 |
Auger electron |
|
1.90974e-04 |
2.715e-01 |
Auger electron |
|
3.34904e-04 |
4.396e-01 |
Auger electron |
|
6.47551e-04 |
7.705e-02 |
Auger electron |
|
1.98901e-03 |
1.598e-02 |
Auger electron |
|
2.80350e-03 |
1.402e-01 |
Auger electron |
|
3.46511e-03 |
3.377e-02 |
Auger electron |
|
1.18119e-02 |
3.338e-02 |
Auger electron |
|
1.58197e-02 |
1.797e-02 |
Auger electron |
|
1.75180e-02 |
6.538e-02 |
Conversion electron |
|
2.28310e-02 |
5.361e-02 |
Conversion electron |
|
3.76562e-02 |
3.466e-02 |
Conversion electron |
|
4.27600e-02 |
1.278e-02 |
Conversion electron |
|
7.15001e+00 |
1.419e-01 |
Alpha |
|
7.19205e+00 |
8.493e-01 |
Alpha |
|
1.14474e-01 |
1.419e-01 |
Alpha recoil |
|
1.15148e-01 |
8.493e-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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