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Radionuclide Dosimetric Data Sheets
Uranium-232
Summary data
General
Classification
Isotope: U-232
Atomic number (Z): 92
Mass number (A): 232
Neutron number (N): 140
Radioactive decay
Decay modes: α
Half-life: 68.9 [y]
Decay constant: 3.1879e-10 [1/s]
Daughters: Th-228 (100.0%)
Radioactive daughters: Th-228
Dosimetric constants
Mean alpha energy: 5.3948 [MeV]
Mean electron energy: 0.01638 [MeV]
Mean photon energy: 0.00231 [MeV]
Air kerma rate constant, Γ10: 3.038e-18 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 3.038e-18 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 8.670e-13 [Gy·kg/Bq·s]
Equilibrium dose constant for alphas, Δα: 8.643e-13
[Gy·kg/Bq·s]
Equilibrium dose constant for betas/electrons, Δβ-,β+,e-:
2.624e-15 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 3.701e-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-232 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-232 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-232 Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
8.23207e-05 |
3.218e+00 |
X-ray |
|
3.07129e-03 |
1.781e-02 |
X-ray |
|
1.29764e-02 |
3.678e-02 |
X-ray |
|
1.62776e-02 |
4.612e-02 |
X-ray |
|
1.90652e-02 |
1.025e-02 |
X-ray |
|
5.13354e-05 |
7.749e-01 |
Auger electron |
|
1.33228e-04 |
8.574e-01 |
Auger electron |
|
1.88162e-04 |
4.920e-01 |
Auger electron |
|
4.99166e-04 |
1.262e-01 |
Auger electron |
|
1.77674e-03 |
2.041e-02 |
Auger electron |
|
2.32738e-03 |
2.789e-01 |
Auger electron |
|
2.74528e-03 |
4.810e-02 |
Auger electron |
|
9.97005e-03 |
7.406e-02 |
Auger electron |
|
1.31067e-02 |
3.694e-02 |
Auger electron |
|
3.80000e-02 |
1.215e-01 |
Conversion electron |
|
4.14650e-02 |
1.031e-01 |
Conversion electron |
|
5.37438e-02 |
6.286e-02 |
Conversion electron |
|
5.77800e-02 |
2.170e-02 |
Conversion electron |
|
5.26347e+00 |
3.155e-01 |
Alpha |
|
5.32023e+00 |
6.815e-01 |
Alpha |
|
9.24015e-02 |
3.155e-01 |
Alpha recoil |
|
9.33981e-02 |
6.815e-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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