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Radionuclide Dosimetric Data Sheets
Cobalt-57
Summary data
General
Classification
Isotope: Co-57
Atomic number (Z): 27
Mass number (A): 57
Neutron number (N): 30
Radioactive decay
Decay modes: Electron capture
Half-life: 271.7 [d]
Decay constant: 2.9523e-08 [1/s]
Daughters: Fe-57 (100.0%)
Radioactive daughters: None
Dosimetric constants
Mean alpha energy: 0.0 [MeV]
Mean electron energy: 0.01863 [MeV]
Mean photon energy: 0.12522 [MeV]
Air kerma rate constant, Γ10: 6.213e-18 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 6.213e-18 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 2.985e-15 [Gy·kg/Bq·s]
Equilibrium dose constant for alphas, Δα: 0.000e+00
[Gy·kg/Bq·s]
Equilibrium dose constant for betas/electrons, Δβ-,β+,e-:
2.985e-15 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 2.006e-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/Co-57 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/Co-57 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/Co-57 Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
1.25321e-05 |
1.046e+01 |
X-ray |
|
6.34985e-03 |
1.653e-01 |
X-ray |
|
6.36272e-03 |
3.238e-01 |
X-ray |
|
7.01536e-03 |
1.991e-02 |
X-ray |
|
7.01694e-03 |
3.913e-02 |
X-ray |
|
1.44129e-02 |
9.160e-02 |
Gamma |
|
1.22061e-01 |
8.560e-01 |
Gamma |
|
1.36474e-01 |
1.068e-01 |
Gamma |
|
4.00631e-05 |
4.492e+00 |
Auger electron |
|
6.97184e-05 |
4.908e-01 |
Auger electron |
|
6.26716e-04 |
2.543e+00 |
Auger electron |
|
6.73760e-04 |
3.428e-02 |
Auger electron |
|
5.58186e-03 |
8.588e-01 |
Auger electron |
|
6.25798e-03 |
2.101e-01 |
Auger electron |
|
6.93818e-03 |
1.310e-02 |
Auger electron |
|
7.32950e-03 |
7.106e-01 |
Conversion electron |
|
1.35699e-02 |
6.778e-02 |
Conversion electron |
|
1.14977e-01 |
1.840e-02 |
Conversion electron |
|
1.29390e-01 |
1.434e-02 |
Conversion electron |
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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