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Radionuclide Dosimetric Data Sheets
Uranium-240
Summary data
General
Classification
Isotope: U-240
Atomic number (Z): 92
Mass number (A): 240
Neutron number (N): 148
Radioactive decay
Decay modes: β-
Half-life: 14.1 [h]
Decay constant: 1.3655e-05 [1/s]
Daughters: Np-240m (100.0%)
Radioactive daughters: Np-240m
Dosimetric constants
Mean alpha energy: 0.0 [MeV]
Mean electron energy: 0.12758 [MeV]
Mean photon energy: 0.00986 [MeV]
Air kerma rate constant, Γ10: 6.680e-18 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 6.680e-18 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 2.044e-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-:
2.044e-14 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 1.580e-15
[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-240 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-240 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-240 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-240 Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
7.43890e-05 |
9.569e+00 |
X-ray |
|
3.34885e-03 |
5.890e-02 |
X-ray |
|
1.37668e-02 |
1.245e-02 |
X-ray |
|
1.39579e-02 |
1.094e-01 |
X-ray |
|
1.68587e-02 |
2.311e-02 |
X-ray |
|
1.70745e-02 |
2.588e-02 |
X-ray |
|
1.78428e-02 |
3.474e-02 |
X-ray |
|
1.80184e-02 |
2.189e-02 |
X-ray |
|
4.41000e-02 |
1.050e-02 |
Gamma |
|
1.01574e-01 |
1.324e-02 |
X-ray |
|
9.41128e-02 |
6.738e-01 |
Beta |
|
1.07757e-01 |
3.203e-01 |
Beta |
|
7.89328e-05 |
2.813e+00 |
Auger electron |
|
1.70055e-04 |
1.669e-02 |
Auger electron |
|
1.91488e-04 |
1.443e+00 |
Auger electron |
|
2.10279e-04 |
2.513e+00 |
Auger electron |
|
5.98270e-04 |
4.312e-01 |
Auger electron |
|
1.67574e-03 |
3.363e-01 |
Auger electron |
|
2.48941e-03 |
8.062e-01 |
Auger electron |
|
2.99217e-03 |
1.578e-01 |
Auger electron |
|
1.05835e-02 |
1.772e-01 |
Auger electron |
|
1.40445e-02 |
9.109e-02 |
Auger electron |
|
1.75619e-02 |
1.103e-02 |
Auger electron |
|
2.16600e-02 |
4.277e-01 |
Conversion electron |
|
2.23980e-02 |
6.024e-02 |
Conversion electron |
|
2.64740e-02 |
1.504e-02 |
Conversion electron |
|
3.96784e-02 |
1.234e-01 |
Conversion electron |
|
4.40600e-02 |
1.874e-02 |
Conversion electron |
|
4.41000e-02 |
4.463e-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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