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Radionuclide Dosimetric Data Sheets
Uranium-242
Summary data
General
Classification
Isotope: U-242
Atomic number (Z): 92
Mass number (A): 242
Neutron number (N): 150
Radioactive decay
Decay modes: β-
Half-life: 16.8 [m]
Decay constant: 6.8765e-04 [1/s]
Daughters: Np-242 (100.0%)
Radioactive daughters: Np-242
Dosimetric constants
Mean alpha energy: 0.0 [MeV]
Mean electron energy: 0.38592 [MeV]
Mean photon energy: 0.04129 [MeV]
Air kerma rate constant, Γ10: 2.162e-18 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 2.162e-18 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 6.183e-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-:
6.183e-14 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 6.615e-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-242 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-242 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-242 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-242 Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
7.44458e-05 |
8.090e-01 |
X-ray |
|
1.39579e-02 |
1.083e-02 |
X-ray |
|
5.55800e-02 |
3.909e-02 |
Gamma |
|
6.76000e-02 |
9.521e-02 |
Gamma |
|
5.72900e-01 |
1.873e-02 |
Gamma |
|
5.85000e-01 |
1.927e-02 |
Gamma |
|
1.65685e-01 |
4.122e-02 |
Beta |
|
2.73503e-01 |
1.276e-02 |
Beta |
|
3.69769e-01 |
1.276e-01 |
Beta |
|
3.74276e-01 |
3.435e-02 |
Beta |
|
3.95208e-01 |
7.753e-01 |
Beta |
|
7.89977e-05 |
2.365e-01 |
Auger electron |
|
1.90377e-04 |
1.234e-01 |
Auger electron |
|
2.08842e-04 |
2.127e-01 |
Auger electron |
|
5.66933e-04 |
3.300e-02 |
Auger electron |
|
1.59387e-03 |
1.649e-02 |
Auger electron |
|
2.49046e-03 |
6.983e-02 |
Auger electron |
|
2.99032e-03 |
1.366e-02 |
Auger electron |
|
1.04517e-02 |
1.691e-02 |
Auger 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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