<= Return to MIRDspec isotope database
Radionuclide Dosimetric Data Sheets
Californium-254
Summary data
General
Classification
Isotope: Cf-254
Atomic number (Z): 98
Mass number (A): 254
Neutron number (N): 156
Radioactive decay
Decay modes: α, Spontaneus fission
Half-life: 60.5 [d]
Decay constant: 1.3260e-07 [1/s]
Daughters: Cm-250 (0.31%), SF (99.7%)
Radioactive daughters: Cm-250
Dosimetric constants
Mean alpha energy: 0.0183 [MeV]
Mean electron energy: 10.0441 [MeV]
Mean photon energy: 16.8399 [MeV]
Air kerma rate constant, Γ10: 4.051e-21 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 2.529e-15 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 1.612e-12 [Gy·kg/Bq·s]
Equilibrium dose constant for alphas, Δα: 2.932e-15
[Gy·kg/Bq·s]
Equilibrium dose constant for betas/electrons, Δβ-,β+,e-:
1.609e-12 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 2.698e-12
[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/Cf-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/Cf-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/Cf-254 Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
1.48000e-02 |
8.682e-02 |
Prompt gamma |
|
3.00000e-02 |
1.497e-01 |
Delayed gamma |
|
3.14000e-02 |
2.264e-01 |
Prompt gamma |
|
5.00000e-02 |
1.497e-01 |
Delayed gamma |
|
7.00000e-02 |
1.497e-01 |
Delayed gamma |
|
7.53000e-02 |
1.907e-02 |
Prompt gamma |
|
8.53000e-02 |
2.704e-02 |
Prompt gamma |
|
9.00000e-02 |
1.497e-01 |
Delayed gamma |
|
9.53000e-02 |
3.860e-02 |
Prompt gamma |
|
1.10000e-01 |
1.497e-01 |
Delayed gamma |
|
1.10000e-01 |
1.283e-01 |
Prompt gamma |
|
1.30000e-01 |
1.497e-01 |
Delayed gamma |
|
1.30000e-01 |
1.283e-01 |
Prompt gamma |
|
1.50000e-01 |
1.497e-01 |
Delayed gamma |
|
1.50000e-01 |
1.283e-01 |
Prompt gamma |
|
1.70000e-01 |
1.497e-01 |
Delayed gamma |
|
1.70000e-01 |
1.283e-01 |
Prompt gamma |
|
1.90000e-01 |
1.497e-01 |
Delayed gamma |
|
1.90000e-01 |
1.283e-01 |
Prompt gamma |
|
2.25000e-01 |
3.675e-01 |
Delayed gamma |
|
2.25000e-01 |
3.218e-01 |
Prompt gamma |
|
2.75000e-01 |
3.675e-01 |
Delayed gamma |
|
2.75000e-01 |
3.218e-01 |
Prompt gamma |
|
3.25000e-01 |
3.675e-01 |
Delayed gamma |
|
3.25000e-01 |
3.218e-01 |
Prompt gamma |
|
3.75000e-01 |
3.675e-01 |
Delayed gamma |
|
3.75000e-01 |
3.218e-01 |
Prompt gamma |
|
4.25000e-01 |
3.218e-01 |
Prompt gamma |
|
4.40000e-01 |
1.034e+00 |
Delayed gamma |
|
4.75000e-01 |
3.218e-01 |
Prompt gamma |
|
5.25000e-01 |
3.218e-01 |
Prompt gamma |
|
5.40000e-01 |
8.031e-01 |
Delayed gamma |
|
5.75000e-01 |
3.218e-01 |
Prompt gamma |
|
6.40000e-01 |
6.261e-01 |
Delayed gamma |
|
6.49000e-01 |
6.197e-01 |
Prompt gamma |
|
7.40000e-01 |
4.900e-01 |
Delayed gamma |
|
7.49000e-01 |
5.180e-01 |
Prompt gamma |
|
8.40000e-01 |
3.811e-01 |
Delayed gamma |
|
8.49000e-01 |
4.345e-01 |
Prompt gamma |
|
9.49000e-01 |
3.630e-01 |
Prompt gamma |
|
1.04900e+00 |
3.044e-01 |
Prompt gamma |
|
1.10000e+00 |
1.606e+00 |
Delayed gamma |
|
1.14900e+00 |
2.539e-01 |
Prompt gamma |
|
1.25000e+00 |
2.127e-01 |
Prompt gamma |
|
1.35000e+00 |
1.779e-01 |
Prompt gamma |
|
1.45000e+00 |
1.485e-01 |
Prompt gamma |
|
1.56000e+00 |
9.800e-01 |
Delayed gamma |
|
1.73000e+00 |
5.271e-01 |
Prompt gamma |
|
2.00000e+00 |
5.172e-01 |
Delayed gamma |
|
2.23000e+00 |
3.062e-01 |
Prompt gamma |
|
2.40000e+00 |
3.811e-01 |
Delayed gamma |
|
2.73000e+00 |
1.769e-01 |
Prompt gamma |
|
2.80000e+00 |
2.178e-01 |
Delayed gamma |
|
3.23000e+00 |
1.027e-01 |
Prompt gamma |
|
3.25000e+00 |
1.633e-01 |
Delayed gamma |
|
3.73000e+00 |
5.959e-02 |
Prompt gamma |
|
3.75000e+00 |
1.171e-01 |
Delayed gamma |
|
4.23000e+00 |
3.456e-02 |
Prompt gamma |
|
4.25000e+00 |
5.717e-02 |
Delayed gamma |
|
4.73000e+00 |
1.999e-02 |
Prompt gamma |
|
4.75000e+00 |
2.722e-02 |
Delayed gamma |
|
5.23000e+00 |
1.164e-02 |
Prompt gamma |
|
5.25000e+00 |
1.293e-02 |
Delayed gamma |
|
5.91000e+00 |
1.063e-02 |
Prompt gamma |
|
1.43997e+00 |
6.975e+00 |
Delayed beta |
|
9.38056e+01 |
1.994e+00 |
Fission fragment |
|
2.31009e+00 |
3.878e+00 |
Neutron |
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
