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Radionuclide Dosimetric Data Sheets
Californium-244
Summary data
General
Classification
Isotope: Cf-244
Atomic number (Z): 98
Mass number (A): 244
Neutron number (N): 146
Radioactive decay
Decay modes: α
Half-life: 19.4 [m]
Decay constant: 5.9549e-04 [1/s]
Daughters: Cm-240 (100.0%)
Radioactive daughters: Cm-240
Dosimetric constants
Mean alpha energy: 7.3195 [MeV]
Mean electron energy: 0.0075 [MeV]
Mean photon energy: 0.00204 [MeV]
Air kerma rate constant, Γ10: 1.923e-18 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 1.923e-18 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 1.174e-12 [Gy·kg/Bq·s]
Equilibrium dose constant for alphas, Δα: 1.173e-12
[Gy·kg/Bq·s]
Equilibrium dose constant for betas/electrons, Δβ-,β+,e-:
1.202e-15 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 3.268e-16
[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-244 Summary 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-244 Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
7.76479e-05 |
2.410e+00 |
X-ray |
|
3.66007e-03 |
1.701e-02 |
X-ray |
|
1.49784e-02 |
3.423e-02 |
X-ray |
|
1.95388e-02 |
3.653e-02 |
X-ray |
|
9.71082e-05 |
6.820e-01 |
Auger electron |
|
1.90643e-04 |
3.647e-01 |
Auger electron |
|
2.79506e-04 |
6.325e-01 |
Auger electron |
|
5.99037e-04 |
1.046e-01 |
Auger electron |
|
1.79407e-03 |
2.130e-02 |
Auger electron |
|
2.67730e-03 |
2.046e-01 |
Auger electron |
|
3.27162e-03 |
4.532e-02 |
Auger electron |
|
1.12532e-02 |
5.001e-02 |
Auger electron |
|
1.42240e-02 |
9.365e-02 |
Conversion electron |
|
1.50238e-02 |
2.646e-02 |
Auger electron |
|
1.90060e-02 |
8.327e-02 |
Conversion electron |
|
3.31710e-02 |
5.067e-02 |
Conversion electron |
|
3.80000e-02 |
1.884e-02 |
Conversion electron |
|
7.17150e+00 |
2.500e-01 |
Alpha |
|
7.20887e+00 |
7.500e-01 |
Alpha |
|
1.19603e-01 |
2.500e-01 |
Alpha recoil |
|
1.20226e-01 |
7.500e-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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