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Radionuclide Dosimetric Data Sheets

Californium-247

Isotope:  Cf-247
Atomic number (Z):  98
Mass number (A):  247
Neutron number (N):  149

Decay modes:  α, Electron capture
Half-life:  3.11 [h]
Decay constant:  6.1910e-05 [1/s]
Daughters:  Bk-247 (100.0%), Cm-243 (0.035%)
Radioactive daughters:  Bk-247, Cm-243

Mean alpha energy:  0.0022 [MeV]
Mean electron energy:  0.04634 [MeV]
Mean photon energy:  0.10498 [MeV]
Air kerma rate constant, Γ₁₀:  1.978e-17 [Gy·m²/Bq·s]
Air kerma coefficient, K_air:  1.978e-17 [Gy·m²/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or electrons), Δ_wp:  7.777e-15 [Gy·kg/Bq·s]
Equilibrium dose constant for alphas, Δ_α:  3.525e-16 [Gy·kg/Bq·s]
Equilibrium dose constant for betas/electrons, Δ_β-,β+,e-:  7.425e-15 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δ_p:  1.682e-14 [Gy·kg/Bq·s]

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-247 DPK.csv

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-247 Summary Spectrum.csv

 

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-247 Summary Spectrum.csv

 

Energy [MeV]	Yield [#/nt] if > 0.01	Radiation type
7.84540e-05	2.561e+01	X-ray
3.75226e-03	1.827e-01	X-ray
5.83200e-03	1.442e-02	X-ray
1.29387e-02	2.661e-02	X-ray
1.50951e-02	4.033e-02	X-ray
1.53277e-02	3.539e-01	X-ray
1.85632e-02	7.684e-02	X-ray
1.91452e-02	6.969e-02	X-ray
1.93317e-02	1.571e-02	X-ray
2.01361e-02	1.430e-01	X-ray
2.03253e-02	5.224e-02	X-ray
2.35469e-02	3.388e-02	X-ray
2.37400e-02	1.917e-02	X-ray
2.40574e-02	1.699e-02	X-ray
1.07707e-01	2.057e-01	X-ray
1.12748e-01	3.201e-01	X-ray
1.26061e-01	3.739e-02	X-ray
1.27242e-01	7.373e-02	X-ray
1.30973e-01	1.964e-02	X-ray
1.03806e-04	7.067e+00	Auger electron
1.91164e-04	4.059e+00	Auger electron
1.99953e-04	3.608e-02	Auger electron
3.04693e-04	6.779e+00	Auger electron
6.41889e-04	1.260e+00	Auger electron
2.24280e-03	7.375e-01	Auger electron
2.72419e-03	2.134e+00	Auger electron
3.35465e-03	4.939e-01	Auger electron
4.08660e-03	3.141e-02	Auger electron
4.60600e-03	5.873e-01	Conversion electron
5.39700e-03	6.484e-02	Conversion electron
1.14794e-02	4.838e-01	Auger electron
1.53760e-02	2.579e-01	Auger electron
1.55060e-02	5.529e-02	Conversion electron
1.67060e-02	1.314e-01	Conversion electron
1.74970e-02	1.458e-02	Conversion electron
1.93314e-02	3.224e-02	Auger electron
2.13380e-02	2.655e-02	Conversion electron
2.49314e-02	1.617e-01	Conversion electron
2.99000e-02	6.009e-02	Conversion electron
3.58314e-02	2.536e-02	Conversion electron
3.70314e-02	3.607e-02	Conversion electron
4.20000e-02	1.345e-02	Conversion electron
8.48417e-02	1.238e-02	Auger electron
1.61890e-01	1.383e-02	Conversion electron

 

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

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

 

 

 

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