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Radionuclide Dosimetric Data Sheets
Uranium-235
Summary data
General
Classification
Isotope: U-235
Atomic number (Z): 92
Mass number (A): 235
Neutron number (N): 143
Radioactive decay
Decay modes: α
Half-life: 704000000.0 [y]
Decay constant: 3.1200e-17 [1/s]
Daughters: Th-231 (100.0%)
Radioactive daughters: Th-231
Dosimetric constants
Mean alpha energy: 4.4689 [MeV]
Mean electron energy: 0.053 [MeV]
Mean photon energy: 0.16686 [MeV]
Air kerma rate constant, Γ10: 1.325e-17 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 1.325e-17 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 7.245e-13 [Gy·kg/Bq·s]
Equilibrium dose constant for alphas, Δα: 7.160e-13
[Gy·kg/Bq·s]
Equilibrium dose constant for betas/electrons, Δβ-,β+,e-:
8.492e-15 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 2.673e-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/U-235 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-235 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-235 Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
8.21570e-05 |
1.437e+01 |
X-ray |
|
3.09360e-03 |
7.011e-02 |
X-ray |
|
1.28126e-02 |
1.195e-02 |
X-ray |
|
1.29764e-02 |
1.050e-01 |
X-ray |
|
1.56384e-02 |
2.169e-02 |
X-ray |
|
1.62776e-02 |
9.647e-02 |
X-ray |
|
1.90652e-02 |
2.144e-02 |
X-ray |
|
9.03299e-02 |
3.571e-02 |
X-ray |
|
9.37949e-02 |
5.772e-02 |
X-ray |
|
1.06073e-01 |
1.290e-02 |
X-ray |
|
1.09160e-01 |
1.540e-02 |
Gamma |
|
1.43760e-01 |
1.096e-01 |
Gamma |
|
1.63330e-01 |
5.080e-02 |
Gamma |
|
1.85715e-01 |
5.720e-01 |
Gamma |
|
2.02110e-01 |
1.080e-02 |
Gamma |
|
2.05311e-01 |
5.010e-02 |
Gamma |
|
5.10857e-05 |
3.538e+00 |
Auger electron |
|
1.39242e-04 |
3.775e+00 |
Auger electron |
|
1.51064e-04 |
2.238e-02 |
Auger electron |
|
1.92089e-04 |
2.178e+00 |
Auger electron |
|
5.68460e-04 |
9.215e-01 |
Auger electron |
|
1.51874e-03 |
1.005e-01 |
Auger electron |
|
2.35419e-03 |
1.099e+00 |
Auger electron |
|
2.79977e-03 |
1.940e-01 |
Auger electron |
|
3.27500e-03 |
1.145e-02 |
Conversion electron |
|
3.40656e-03 |
1.151e-02 |
Auger electron |
|
9.85062e-03 |
1.965e-01 |
Auger electron |
|
1.11220e-02 |
1.221e-02 |
Conversion electron |
|
1.18200e-02 |
3.800e-02 |
Conversion electron |
|
1.29819e-02 |
9.790e-02 |
Auger electron |
|
1.42220e-02 |
2.256e-02 |
Conversion electron |
|
1.52850e-02 |
3.611e-02 |
Conversion electron |
|
1.55538e-02 |
4.418e-01 |
Conversion electron |
|
1.61488e-02 |
1.151e-02 |
Auger electron |
|
1.95900e-02 |
1.567e-01 |
Conversion electron |
|
2.09220e-02 |
1.092e-02 |
Conversion electron |
|
2.14820e-02 |
1.149e-02 |
Conversion electron |
|
2.21800e-02 |
9.714e-02 |
Conversion electron |
|
2.56450e-02 |
8.857e-02 |
Conversion electron |
|
2.75638e-02 |
2.317e-02 |
Conversion electron |
|
3.14400e-02 |
3.650e-02 |
Conversion electron |
|
3.36500e-02 |
1.782e-02 |
Conversion electron |
|
3.49050e-02 |
3.198e-02 |
Conversion electron |
|
3.79238e-02 |
5.366e-02 |
Conversion electron |
|
4.19600e-02 |
1.855e-02 |
Conversion electron |
|
4.71838e-02 |
1.912e-02 |
Conversion electron |
|
5.29200e-02 |
2.291e-02 |
Conversion electron |
|
5.63850e-02 |
1.806e-02 |
Conversion electron |
|
6.86638e-02 |
1.152e-02 |
Conversion electron |
|
7.56050e-02 |
5.116e-02 |
Conversion electron |
|
9.20000e-02 |
2.349e-02 |
Conversion electron |
|
4.21782e+00 |
5.761e-02 |
Alpha |
|
4.32575e+00 |
4.447e-02 |
Alpha |
|
4.36615e+00 |
1.718e-01 |
Alpha |
|
4.39721e+00 |
5.559e-01 |
Alpha |
|
4.41647e+00 |
2.123e-02 |
Alpha |
|
4.50455e+00 |
1.718e-02 |
Alpha |
|
4.55773e+00 |
4.245e-02 |
Alpha |
|
4.59901e+00 |
5.054e-02 |
Alpha |
|
7.30833e-02 |
5.761e-02 |
Alpha recoil |
|
7.49534e-02 |
4.447e-02 |
Alpha recoil |
|
7.56534e-02 |
1.718e-01 |
Alpha recoil |
|
7.61916e-02 |
5.559e-01 |
Alpha recoil |
|
7.65255e-02 |
2.123e-02 |
Alpha recoil |
|
7.80516e-02 |
1.718e-02 |
Alpha recoil |
|
7.89730e-02 |
4.245e-02 |
Alpha recoil |
|
7.96883e-02 |
5.054e-02 |
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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