<= Return to MIRDspec isotope database
Radionuclide Dosimetric Data Sheets
Californium-252
Summary data
General
Classification
Isotope: Cf-252
Atomic number (Z): 98
Mass number (A): 252
Neutron number (N): 154
Radioactive decay
Decay modes: α, Spontaneus fission
Half-life: 2.645 [y]
Decay constant: 8.3043e-09 [1/s]
Daughters: Cm-248 (96.9%), SF (3.09%)
Radioactive daughters: Cm-248
Dosimetric constants
Mean alpha energy: 6.0177 [MeV]
Mean electron energy: 0.25158 [MeV]
Mean photon energy: 0.45724 [MeV]
Air kerma rate constant, Γ10: 1.190e-18 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 7.543e-17 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 1.004e-12 [Gy·kg/Bq·s]
Equilibrium dose constant for alphas, Δα: 9.641e-13
[Gy·kg/Bq·s]
Equilibrium dose constant for betas/electrons, Δβ-,β+,e-:
4.031e-14 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 7.326e-14
[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/Cf-252 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/Cf-252 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-252 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-252 Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
7.76505e-05 |
1.495e+00 |
X-ray |
|
3.66090e-03 |
1.056e-02 |
X-ray |
|
1.49784e-02 |
2.088e-02 |
X-ray |
|
1.95388e-02 |
2.321e-02 |
X-ray |
|
4.40000e-01 |
2.533e-02 |
Delayed gamma |
|
5.40000e-01 |
1.967e-02 |
Delayed gamma |
|
6.40000e-01 |
1.533e-02 |
Delayed gamma |
|
6.49000e-01 |
1.903e-02 |
Prompt gamma |
|
7.40000e-01 |
1.200e-02 |
Delayed gamma |
|
7.49000e-01 |
1.590e-02 |
Prompt gamma |
|
8.49000e-01 |
1.334e-02 |
Prompt gamma |
|
9.49000e-01 |
1.115e-02 |
Prompt gamma |
|
1.10000e+00 |
3.933e-02 |
Delayed gamma |
|
1.56000e+00 |
2.400e-02 |
Delayed gamma |
|
1.73000e+00 |
1.618e-02 |
Prompt gamma |
|
2.00000e+00 |
1.267e-02 |
Delayed gamma |
|
1.27952e+00 |
1.922e-01 |
Delayed beta |
|
9.71089e-05 |
4.230e-01 |
Auger electron |
|
1.90616e-04 |
2.264e-01 |
Auger electron |
|
2.79669e-04 |
3.923e-01 |
Auger electron |
|
6.01166e-04 |
6.483e-02 |
Auger electron |
|
1.79582e-03 |
1.360e-02 |
Auger electron |
|
2.67813e-03 |
1.268e-01 |
Auger electron |
|
3.27252e-03 |
2.810e-02 |
Auger electron |
|
1.12900e-02 |
3.093e-02 |
Auger electron |
|
1.50636e-02 |
1.637e-02 |
Auger electron |
|
1.96230e-02 |
5.849e-02 |
Conversion electron |
|
2.44050e-02 |
4.952e-02 |
Conversion electron |
|
3.85700e-02 |
3.067e-02 |
Conversion electron |
|
4.33990e-02 |
1.144e-02 |
Conversion electron |
|
6.07542e+00 |
1.519e-01 |
Alpha |
|
6.11813e+00 |
8.148e-01 |
Alpha |
|
9.80543e-02 |
1.519e-01 |
Alpha recoil |
|
9.87436e-02 |
8.148e-01 |
Alpha recoil |
|
9.40435e+01 |
6.184e-02 |
Fission fragment |
|
2.30603e+00 |
1.164e-01 |
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
