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Radionuclide Dosimetric Data Sheets
Neptunium-233
Summary data
General
Classification
Isotope: Np-233
Atomic number (Z): 93
Mass number (A): 233
Neutron number (N): 140
Radioactive decay
Decay modes: α, Electron capture
Half-life: 36.2 [m]
Decay constant: 3.1913e-04 [1/s]
Daughters: U-233 (100.0%), Pa-229 (0.001%)
Radioactive daughters: U-233, Pa-229
Dosimetric constants
Mean alpha energy: 0.0 [MeV]
Mean electron energy: 0.01436 [MeV]
Mean photon energy: 0.09105 [MeV]
Air kerma rate constant, Γ10: 1.268e-17 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 1.268e-17 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 2.301e-15 [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-:
2.301e-15 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 1.459e-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/Np-233 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/Np-233 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/Np-233 Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
7.54578e-05 |
1.146e+01 |
X-ray |
|
3.24875e-03 |
6.983e-02 |
X-ray |
|
1.16607e-02 |
1.177e-02 |
X-ray |
|
1.34452e-02 |
1.918e-02 |
X-ray |
|
1.36268e-02 |
1.685e-01 |
X-ray |
|
1.64469e-02 |
3.535e-02 |
X-ray |
|
1.73072e-02 |
9.364e-02 |
X-ray |
|
2.02658e-02 |
2.121e-02 |
X-ray |
|
9.50660e-02 |
2.211e-01 |
X-ray |
|
9.89281e-02 |
3.538e-01 |
X-ray |
|
1.10929e-01 |
4.080e-02 |
X-ray |
|
1.11820e-01 |
7.979e-02 |
X-ray |
|
1.14846e-01 |
1.020e-02 |
X-ray |
|
1.15080e-01 |
2.064e-02 |
X-ray |
|
7.22035e-05 |
3.090e+00 |
Auger electron |
|
1.62894e-04 |
1.970e-02 |
Auger electron |
|
1.85270e-04 |
3.024e+00 |
Auger electron |
|
1.92163e-04 |
1.716e+00 |
Auger electron |
|
5.35276e-04 |
4.469e-01 |
Auger electron |
|
1.44076e-03 |
1.891e-01 |
Auger electron |
|
2.42962e-03 |
1.001e+00 |
Auger electron |
|
2.89843e-03 |
1.875e-01 |
Auger electron |
|
3.51287e-03 |
1.101e-02 |
Auger electron |
|
1.00566e-02 |
2.562e-01 |
Auger electron |
|
1.33755e-02 |
1.300e-01 |
Auger electron |
|
1.67251e-02 |
1.553e-02 |
Auger electron |
|
7.54320e-02 |
1.524e-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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