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Radionuclide Dosimetric Data Sheets
Uranium-239
Summary data
General
Classification
Isotope: U-239
Atomic number (Z): 92
Mass number (A): 239
Neutron number (N): 147
Radioactive decay
Decay modes: β-
Half-life: 23.45 [m]
Decay constant: 4.9264e-04 [1/s]
Daughters: Np-239 (100.0%)
Radioactive daughters: Np-239
Dosimetric constants
Mean alpha energy: 0.0 [MeV]
Mean electron energy: 0.41079 [MeV]
Mean photon energy: 0.05185 [MeV]
Air kerma rate constant, Γ10: 4.958e-18 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 4.958e-18 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 6.582e-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-:
6.582e-14 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 8.307e-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-239 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-239 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-239 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-239 Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
7.44325e-05 |
4.247e+00 |
X-ray |
|
3.35021e-03 |
2.658e-02 |
X-ray |
|
1.39579e-02 |
5.351e-02 |
X-ray |
|
1.68587e-02 |
1.130e-02 |
X-ray |
|
1.78428e-02 |
3.136e-02 |
X-ray |
|
4.35330e-02 |
4.069e-02 |
Gamma |
|
7.46640e-02 |
4.920e-01 |
Gamma |
|
3.74797e-01 |
1.957e-02 |
Beta |
|
3.91006e-01 |
6.890e-01 |
Beta |
|
4.07481e-01 |
9.386e-02 |
Beta |
|
4.19314e-01 |
1.867e-01 |
Beta |
|
7.89764e-05 |
1.244e+00 |
Auger electron |
|
1.90773e-04 |
6.461e-01 |
Auger electron |
|
2.09435e-04 |
1.116e+00 |
Auger electron |
|
5.78291e-04 |
1.797e-01 |
Auger electron |
|
1.62656e-03 |
1.049e-01 |
Auger electron |
|
2.49133e-03 |
3.633e-01 |
Auger electron |
|
2.99258e-03 |
7.113e-02 |
Auger electron |
|
8.69100e-03 |
7.169e-02 |
Conversion electron |
|
9.42900e-03 |
3.448e-02 |
Conversion electron |
|
1.05058e-02 |
8.506e-02 |
Auger electron |
|
1.35050e-02 |
2.579e-02 |
Conversion electron |
|
1.39527e-02 |
4.370e-02 |
Auger electron |
|
2.18310e-02 |
1.203e-02 |
Conversion electron |
|
2.59070e-02 |
1.334e-02 |
Conversion electron |
|
2.67094e-02 |
3.398e-02 |
Conversion electron |
|
3.11310e-02 |
1.220e-02 |
Conversion electron |
|
5.22240e-02 |
4.175e-02 |
Conversion electron |
|
5.29620e-02 |
3.196e-02 |
Conversion electron |
|
5.70380e-02 |
3.002e-02 |
Conversion electron |
|
7.02424e-02 |
2.570e-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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