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Radionuclide Dosimetric Data Sheets
Californium-250
Summary data
General
Classification
Isotope: Cf-250
Atomic number (Z): 98
Mass number (A): 250
Neutron number (N): 152
Radioactive decay
Decay modes: α, Spontaneus fission
Half-life: 13.08 [y]
Decay constant: 1.6793e-09 [1/s]
Daughters: Cm-246 (99.9%), SF (0.077%)
Radioactive daughters: Cm-246
Dosimetric constants
Mean alpha energy: 6.1168 [MeV]
Mean electron energy: 0.01027 [MeV]
Mean photon energy: 0.01112 [MeV]
Air kerma rate constant, Γ10: 1.198e-18 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 2.907e-18 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 9.817e-13 [Gy·kg/Bq·s]
Equilibrium dose constant for alphas, Δα: 9.800e-13
[Gy·kg/Bq·s]
Equilibrium dose constant for betas/electrons, Δβ-,β+,e-:
1.645e-15 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 1.782e-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/Cf-250 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-250 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-250 Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
7.76503e-05 |
1.504e+00 |
X-ray |
|
3.66084e-03 |
1.062e-02 |
X-ray |
|
1.49784e-02 |
2.104e-02 |
X-ray |
|
1.95388e-02 |
2.330e-02 |
X-ray |
|
9.71088e-05 |
4.256e-01 |
Auger electron |
|
1.90619e-04 |
2.278e-01 |
Auger electron |
|
2.79658e-04 |
3.947e-01 |
Auger electron |
|
6.01036e-04 |
6.524e-02 |
Auger electron |
|
1.79582e-03 |
1.366e-02 |
Auger electron |
|
2.67807e-03 |
1.276e-01 |
Auger electron |
|
3.27246e-03 |
2.827e-02 |
Auger electron |
|
1.12868e-02 |
3.113e-02 |
Auger electron |
|
1.50601e-02 |
1.648e-02 |
Auger electron |
|
1.90760e-02 |
5.849e-02 |
Conversion electron |
|
2.38580e-02 |
4.981e-02 |
Conversion electron |
|
3.80230e-02 |
3.078e-02 |
Conversion electron |
|
4.28520e-02 |
1.148e-02 |
Conversion electron |
|
5.98816e+00 |
1.499e-01 |
Alpha |
|
6.03032e+00 |
8.463e-01 |
Alpha |
|
9.74317e-02 |
1.499e-01 |
Alpha recoil |
|
9.81178e-02 |
8.463e-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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