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Radionuclide Dosimetric Data Sheets
Uranium-237
Summary data
General
Classification
Isotope: U-237
Atomic number (Z): 92
Mass number (A): 237
Neutron number (N): 145
Radioactive decay
Decay modes: β-
Half-life: 6.75 [d]
Decay constant: 1.1885e-06 [1/s]
Daughters: Np-237 (100.0%)
Radioactive daughters: Np-237
Dosimetric constants
Mean alpha energy: 0.0 [MeV]
Mean electron energy: 0.19907 [MeV]
Mean photon energy: 0.14424 [MeV]
Air kerma rate constant, Γ10: 1.952e-17 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 1.952e-17 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 3.189e-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-:
3.189e-14 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 2.311e-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-237 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-237 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/U-237 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/U-237 Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
7.43928e-05 |
2.300e+01 |
X-ray |
|
3.36251e-03 |
1.366e-01 |
X-ray |
|
1.19138e-02 |
1.792e-02 |
X-ray |
|
1.37668e-02 |
2.884e-02 |
X-ray |
|
1.39579e-02 |
2.533e-01 |
X-ray |
|
1.68587e-02 |
5.351e-02 |
X-ray |
|
1.70745e-02 |
2.140e-02 |
X-ray |
|
1.75165e-02 |
1.032e-02 |
X-ray |
|
1.78428e-02 |
1.508e-01 |
X-ray |
|
1.80184e-02 |
1.810e-02 |
X-ray |
|
2.08890e-02 |
3.446e-02 |
X-ray |
|
2.63480e-02 |
2.430e-02 |
Gamma |
|
5.95360e-02 |
3.450e-01 |
Gamma |
|
6.48300e-02 |
1.282e-02 |
Gamma |
|
9.74979e-02 |
1.610e-01 |
X-ray |
|
1.01574e-01 |
2.563e-01 |
X-ray |
|
1.13834e-01 |
2.964e-02 |
X-ray |
|
1.14778e-01 |
5.801e-02 |
X-ray |
|
1.18129e-01 |
1.511e-02 |
X-ray |
|
1.64610e-01 |
1.860e-02 |
Gamma |
|
2.08000e-01 |
2.120e-01 |
Gamma |
|
3.32360e-01 |
1.200e-02 |
Gamma |
|
4.98266e-02 |
3.393e-02 |
Beta |
|
6.45463e-02 |
5.090e-01 |
Beta |
|
6.86026e-02 |
4.192e-01 |
Beta |
|
1.37576e-01 |
2.994e-02 |
Beta |
|
7.88989e-05 |
6.793e+00 |
Auger electron |
|
1.70215e-04 |
4.030e-02 |
Auger electron |
|
1.92768e-04 |
3.502e+00 |
Auger electron |
|
2.12624e-04 |
6.009e+00 |
Auger electron |
|
6.09801e-04 |
1.225e+00 |
Auger electron |
|
1.59402e-03 |
3.518e-01 |
Auger electron |
|
2.50775e-03 |
1.867e+00 |
Auger electron |
|
3.02185e-03 |
3.693e-01 |
Auger electron |
|
3.67622e-03 |
2.224e-02 |
Auger electron |
|
3.90800e-03 |
2.601e-02 |
Conversion electron |
|
4.64600e-03 |
5.096e-02 |
Conversion electron |
|
8.72200e-03 |
6.679e-02 |
Conversion electron |
|
9.38840e-03 |
3.905e-01 |
Conversion electron |
|
1.03848e-02 |
3.848e-01 |
Auger electron |
|
1.07550e-02 |
1.213e-01 |
Conversion electron |
|
1.14930e-02 |
3.669e-02 |
Conversion electron |
|
1.38100e-02 |
1.411e-01 |
Conversion electron |
|
1.38185e-02 |
1.975e-01 |
Auger electron |
|
1.55690e-02 |
2.280e-02 |
Conversion electron |
|
1.72903e-02 |
2.385e-02 |
Auger electron |
|
2.17210e-02 |
1.144e-02 |
Conversion electron |
|
2.19264e-02 |
3.781e-02 |
Conversion electron |
|
2.63480e-02 |
1.282e-02 |
Conversion electron |
|
2.87734e-02 |
4.569e-02 |
Conversion electron |
|
3.31950e-02 |
1.646e-02 |
Conversion electron |
|
3.70960e-02 |
1.057e-01 |
Conversion electron |
|
3.78340e-02 |
9.633e-02 |
Conversion electron |
|
4.19100e-02 |
9.752e-02 |
Conversion electron |
|
5.51144e-02 |
7.475e-02 |
Conversion electron |
|
5.95360e-02 |
2.592e-02 |
Conversion electron |
|
7.72522e-02 |
1.087e-02 |
Auger electron |
|
8.88000e-02 |
5.425e-01 |
Conversion electron |
|
1.42908e-01 |
1.265e-02 |
Conversion electron |
|
1.85560e-01 |
9.481e-02 |
Conversion electron |
|
1.86298e-01 |
1.172e-02 |
Conversion electron |
|
2.03578e-01 |
2.620e-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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