<= Return to MIRDspec isotope database
Radionuclide Dosimetric Data Sheets
Californium-246
Summary data
General
Classification
Isotope: Cf-246
Atomic number (Z): 98
Mass number (A): 246
Neutron number (N): 148
Radioactive decay
Decay modes: α, Spontaneus fission
Half-life: 35.7 [h]
Decay constant: 5.3933e-06 [1/s]
Daughters: Cm-242 (100.0%), SF (0.00025%)
Radioactive daughters: Cm-242
Dosimetric constants
Mean alpha energy: 6.8526 [MeV]
Mean electron energy: 0.00597 [MeV]
Mean photon energy: 0.00144 [MeV]
Air kerma rate constant, Γ10: 1.314e-18 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 1.318e-18 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 1.099e-12 [Gy·kg/Bq·s]
Equilibrium dose constant for alphas, Δα: 1.098e-12
[Gy·kg/Bq·s]
Equilibrium dose constant for betas/electrons, Δβ-,β+,e-:
9.565e-16 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 2.307e-16
[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-246 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-246 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-246 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-246 Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
7.76496e-05 |
1.649e+00 |
X-ray |
|
3.66063e-03 |
1.165e-02 |
X-ray |
|
1.49784e-02 |
2.318e-02 |
X-ray |
|
1.95388e-02 |
2.534e-02 |
X-ray |
|
9.71087e-05 |
4.668e-01 |
Auger electron |
|
1.90634e-04 |
2.498e-01 |
Auger electron |
|
2.79630e-04 |
4.329e-01 |
Auger electron |
|
6.00679e-04 |
7.160e-02 |
Auger electron |
|
1.79618e-03 |
1.486e-02 |
Auger electron |
|
2.67788e-03 |
1.400e-01 |
Auger electron |
|
3.27229e-03 |
3.101e-02 |
Auger electron |
|
1.12753e-02 |
3.415e-02 |
Auger electron |
|
1.50478e-02 |
1.807e-02 |
Auger electron |
|
1.82240e-02 |
6.373e-02 |
Conversion electron |
|
2.30060e-02 |
5.515e-02 |
Conversion electron |
|
3.71710e-02 |
3.397e-02 |
Conversion electron |
|
4.20000e-02 |
1.266e-02 |
Conversion electron |
|
6.70851e+00 |
2.059e-01 |
Alpha |
|
6.74996e+00 |
7.925e-01 |
Alpha |
|
1.10957e-01 |
2.059e-01 |
Alpha recoil |
|
1.11642e-01 |
7.925e-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)
<= Return to MIRDspec isotope database
