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Radionuclide Dosimetric Data Sheets
Uranium-234
Summary data
General
Classification
Isotope: U-234
Atomic number (Z): 92
Mass number (A): 234
Neutron number (N): 142
Radioactive decay
Decay modes: α
Half-life: 245500.0 [y]
Decay constant: 8.9470e-14 [1/s]
Daughters: Th-230 (100.0%)
Radioactive daughters: Th-230
Dosimetric constants
Mean alpha energy: 4.843 [MeV]
Mean electron energy: 0.01365 [MeV]
Mean photon energy: 0.00201 [MeV]
Air kerma rate constant, Γ10: 2.783e-18 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 2.783e-18 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 7.781e-13 [Gy·kg/Bq·s]
Equilibrium dose constant for alphas, Δα: 7.759e-13
[Gy·kg/Bq·s]
Equilibrium dose constant for betas/electrons, Δβ-,β+,e-:
2.187e-15 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 3.220e-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-234 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-234 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-234 Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
8.23188e-05 |
2.947e+00 |
X-ray |
|
3.07093e-03 |
1.631e-02 |
X-ray |
|
1.29764e-02 |
3.399e-02 |
X-ray |
|
1.62776e-02 |
4.183e-02 |
X-ray |
|
5.13378e-05 |
7.094e-01 |
Auger electron |
|
1.33173e-04 |
7.850e-01 |
Auger electron |
|
1.88133e-04 |
4.503e-01 |
Auger electron |
|
4.98125e-04 |
1.154e-01 |
Auger electron |
|
1.77785e-03 |
1.846e-02 |
Auger electron |
|
2.32695e-03 |
2.555e-01 |
Auger electron |
|
2.74470e-03 |
4.406e-02 |
Auger electron |
|
9.95716e-03 |
6.793e-02 |
Auger electron |
|
1.30929e-02 |
3.388e-02 |
Auger electron |
|
3.34200e-02 |
1.103e-01 |
Conversion electron |
|
3.68850e-02 |
9.573e-02 |
Conversion electron |
|
4.91638e-02 |
5.759e-02 |
Conversion electron |
|
5.32000e-02 |
1.989e-02 |
Conversion electron |
|
4.72311e+00 |
2.842e-01 |
Alpha |
|
4.77540e+00 |
7.138e-01 |
Alpha |
|
8.21944e-02 |
2.842e-01 |
Alpha recoil |
|
8.31043e-02 |
7.138e-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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