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Radionuclide Dosimetric Data Sheets
Uranium-236
Summary data
General
Classification
Isotope: U-236
Atomic number (Z): 92
Mass number (A): 236
Neutron number (N): 144
Radioactive decay
Decay modes: α
Half-life: 23420000.0 [y]
Decay constant: 9.3787e-16 [1/s]
Daughters: Th-232 (100.0%)
Radioactive daughters: Th-232
Dosimetric constants
Mean alpha energy: 4.5591 [MeV]
Mean electron energy: 0.01137 [MeV]
Mean photon energy: 0.00178 [MeV]
Air kerma rate constant, Γ10: 2.532e-18 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 2.532e-18 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 7.323e-13 [Gy·kg/Bq·s]
Equilibrium dose constant for alphas, Δα: 7.304e-13
[Gy·kg/Bq·s]
Equilibrium dose constant for betas/electrons, Δβ-,β+,e-:
1.822e-15 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 2.852e-16
[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/U-236 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/U-236 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/U-236 Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
8.23171e-05 |
2.679e+00 |
X-ray |
|
3.07061e-03 |
1.483e-02 |
X-ray |
|
1.29764e-02 |
3.115e-02 |
X-ray |
|
1.62776e-02 |
3.773e-02 |
X-ray |
|
5.13399e-05 |
6.450e-01 |
Auger electron |
|
1.33124e-04 |
7.137e-01 |
Auger electron |
|
1.88109e-04 |
4.094e-01 |
Auger electron |
|
4.97216e-04 |
1.048e-01 |
Auger electron |
|
1.77864e-03 |
1.662e-02 |
Auger electron |
|
2.32657e-03 |
2.324e-01 |
Auger electron |
|
2.74419e-03 |
4.007e-02 |
Auger electron |
|
9.94619e-03 |
6.187e-02 |
Auger electron |
|
1.30812e-02 |
3.085e-02 |
Auger electron |
|
2.95890e-02 |
9.973e-02 |
Conversion electron |
|
3.30540e-02 |
8.817e-02 |
Conversion electron |
|
4.53328e-02 |
5.243e-02 |
Conversion electron |
|
4.93690e-02 |
1.811e-02 |
Conversion electron |
|
4.44632e+00 |
2.591e-01 |
Alpha |
|
4.49485e+00 |
7.383e-01 |
Alpha |
|
7.67105e-02 |
2.591e-01 |
Alpha recoil |
|
7.75478e-02 |
7.383e-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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