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Radionuclide Dosimetric Data Sheets
Californium-249
Summary data
General
Classification
Isotope: Cf-249
Atomic number (Z): 98
Mass number (A): 249
Neutron number (N): 151
Radioactive decay
Decay modes: α, Spontaneus fission
Half-life: 351.0 [y]
Decay constant: 6.2578e-11 [1/s]
Daughters: Cm-245 (100.0%), SF (5.02e-07%)
Radioactive daughters: Cm-245
Dosimetric constants
Mean alpha energy: 5.9262 [MeV]
Mean electron energy: 0.03994 [MeV]
Mean photon energy: 0.32824 [MeV]
Air kerma rate constant, Γ10: 1.648e-17 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 1.648e-17 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 9.559e-13 [Gy·kg/Bq·s]
Equilibrium dose constant for alphas, Δα: 9.495e-13
[Gy·kg/Bq·s]
Equilibrium dose constant for betas/electrons, Δβ-,β+,e-:
6.399e-15 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 5.259e-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-249 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-249 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-249 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-249 Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
7.76221e-05 |
5.797e+00 |
X-ray |
|
3.65763e-03 |
4.064e-02 |
X-ray |
|
1.49784e-02 |
7.956e-02 |
X-ray |
|
1.81285e-02 |
1.716e-02 |
X-ray |
|
1.95388e-02 |
7.385e-02 |
X-ray |
|
2.28564e-02 |
1.735e-02 |
X-ray |
|
1.05084e-01 |
2.152e-02 |
X-ray |
|
1.09866e-01 |
3.368e-02 |
X-ray |
|
2.52800e-01 |
2.501e-02 |
Gamma |
|
3.33370e-01 |
1.459e-01 |
Gamma |
|
3.88160e-01 |
6.600e-01 |
Gamma |
|
9.70679e-05 |
1.644e+00 |
Auger electron |
|
1.91341e-04 |
8.716e-01 |
Auger electron |
|
2.79897e-04 |
1.522e+00 |
Auger electron |
|
6.11019e-04 |
2.567e-01 |
Auger electron |
|
1.96965e-03 |
8.773e-02 |
Auger electron |
|
2.67445e-03 |
4.894e-01 |
Auger electron |
|
3.26890e-03 |
1.084e-01 |
Auger electron |
|
1.12922e-02 |
1.172e-01 |
Auger electron |
|
1.50697e-02 |
6.199e-02 |
Auger electron |
|
1.83260e-02 |
2.186e-02 |
Conversion electron |
|
3.02560e-02 |
2.315e-02 |
Conversion electron |
|
3.10340e-02 |
1.551e-02 |
Conversion electron |
|
3.10340e-02 |
1.358e-01 |
Conversion electron |
|
3.58160e-02 |
1.163e-02 |
Conversion electron |
|
3.58160e-02 |
1.054e-01 |
Conversion electron |
|
4.99810e-02 |
7.305e-02 |
Conversion electron |
|
5.48100e-02 |
2.737e-02 |
Conversion electron |
|
1.23940e-01 |
4.861e-02 |
Conversion electron |
|
2.59300e-01 |
1.354e-02 |
Conversion electron |
|
5.75803e+00 |
4.700e-02 |
Alpha |
|
5.81175e+00 |
8.238e-01 |
Alpha |
|
5.84859e+00 |
1.433e-02 |
Alpha |
|
5.90277e+00 |
3.217e-02 |
Alpha |
|
5.94501e+00 |
3.337e-02 |
Alpha |
|
6.13988e+00 |
1.333e-02 |
Alpha |
|
6.19381e+00 |
2.465e-02 |
Alpha |
|
9.40698e-02 |
4.700e-02 |
Alpha recoil |
|
9.49474e-02 |
8.238e-01 |
Alpha recoil |
|
9.55493e-02 |
1.433e-02 |
Alpha recoil |
|
9.64343e-02 |
3.217e-02 |
Alpha recoil |
|
9.71244e-02 |
3.337e-02 |
Alpha recoil |
|
1.00308e-01 |
1.333e-02 |
Alpha recoil |
|
1.01189e-01 |
2.465e-02 |
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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