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Radionuclide Dosimetric Data Sheets
Chromium-56
Summary data
General
Classification
Isotope: Cr-56
Atomic number (Z): 24
Mass number (A): 56
Neutron number (N): 32
Radioactive decay
Decay modes: β-
Half-life: 5.94 [m]
Decay constant: 1.9449e-03 [1/s]
Daughters: Mn-56 (100.0%)
Radioactive daughters: Mn-56
Dosimetric constants
Mean alpha energy: 0.0 [MeV]
Mean electron energy: 0.60826 [MeV]
Mean photon energy: 0.09175 [MeV]
Air kerma rate constant, Γ10: 5.885e-18 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 5.885e-18 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 9.745e-14 [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-:
9.745e-14 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 1.470e-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/Cr-56 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/Cr-56 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/Cr-56 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/Cr-56 Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
1.14880e-05 |
3.795e+00 |
X-ray |
|
5.84793e-03 |
5.183e-02 |
X-ray |
|
5.85866e-03 |
1.016e-01 |
X-ray |
|
6.45011e-03 |
1.215e-02 |
X-ray |
|
2.60000e-02 |
4.460e-01 |
Gamma |
|
8.30000e-02 |
9.530e-01 |
Gamma |
|
5.90476e-01 |
1.000e+00 |
Beta |
|
3.65273e-05 |
1.700e+00 |
Auger electron |
|
6.48980e-05 |
1.729e-01 |
Auger electron |
|
5.59273e-04 |
8.934e-01 |
Auger electron |
|
6.06206e-04 |
1.390e-02 |
Auger electron |
|
5.15113e-03 |
3.127e-01 |
Auger electron |
|
5.76226e-03 |
7.562e-02 |
Auger electron |
|
1.94891e-02 |
5.217e-01 |
Conversion electron |
|
2.52335e-02 |
4.897e-02 |
Conversion electron |
|
7.64891e-02 |
4.300e-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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