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Radionuclide Dosimetric Data Sheets
Neptunium-236
Summary data
General
Classification
Isotope: Np-236
Atomic number (Z): 93
Mass number (A): 236
Neutron number (N): 143
Radioactive decay
Decay modes: α, β-, Electron capture
Half-life: 154000.0 [y]
Decay constant: 1.4263e-13 [1/s]
Daughters: U-236 (87.3%), Pu-236 (12.5%), Pa-232 (0.16%)
Radioactive daughters: U-236, Pu-236, Pa-232
Dosimetric constants
Mean alpha energy: 0.0073 [MeV]
Mean electron energy: 0.23718 [MeV]
Mean photon energy: 0.15936 [MeV]
Air kerma rate constant, Γ10: 3.589e-17 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 3.589e-17 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 3.917e-14 [Gy·kg/Bq·s]
Equilibrium dose constant for alphas, Δα: 1.170e-15
[Gy·kg/Bq·s]
Equilibrium dose constant for betas/electrons, Δβ-,β+,e-:
3.800e-14 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 2.553e-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-236 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-236 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/Np-236 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/Np-236 Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
7.20537e-05 |
3.344e+00 |
X-ray |
|
7.55077e-05 |
3.299e+01 |
X-ray |
|
3.25821e-03 |
2.011e-01 |
X-ray |
|
3.45969e-03 |
2.201e-02 |
X-ray |
|
1.16607e-02 |
2.979e-02 |
X-ray |
|
1.34452e-02 |
4.855e-02 |
X-ray |
|
1.36268e-02 |
4.266e-01 |
X-ray |
|
1.42941e-02 |
4.213e-02 |
X-ray |
|
1.55227e-02 |
1.147e-02 |
X-ray |
|
1.64468e-02 |
8.947e-02 |
X-ray |
|
1.65865e-02 |
1.221e-02 |
X-ray |
|
1.70780e-02 |
1.693e-02 |
X-ray |
|
1.73072e-02 |
4.077e-01 |
X-ray |
|
1.74784e-02 |
1.062e-02 |
X-ray |
|
1.83932e-02 |
5.147e-02 |
X-ray |
|
2.02658e-02 |
9.233e-02 |
X-ray |
|
2.09317e-02 |
1.788e-02 |
X-ray |
|
2.15284e-02 |
1.188e-02 |
X-ray |
|
9.50660e-02 |
2.016e-01 |
X-ray |
|
9.89281e-02 |
3.226e-01 |
X-ray |
|
1.04230e-01 |
7.249e-02 |
Gamma |
|
1.10929e-01 |
3.720e-02 |
X-ray |
|
1.11820e-01 |
7.275e-02 |
X-ray |
|
1.15080e-01 |
1.882e-02 |
X-ray |
|
1.58350e-01 |
3.959e-02 |
Gamma |
|
1.60330e-01 |
3.152e-01 |
Gamma |
|
4.63896e-02 |
1.202e-01 |
Beta |
|
7.21761e-05 |
8.889e+00 |
Auger electron |
|
8.91092e-05 |
9.157e-01 |
Auger electron |
|
1.63106e-04 |
5.671e-02 |
Auger electron |
|
1.86366e-04 |
8.702e+00 |
Auger electron |
|
1.91873e-04 |
5.227e-01 |
Auger electron |
|
1.92556e-04 |
4.982e+00 |
Auger electron |
|
2.37649e-04 |
8.774e-01 |
Auger electron |
|
5.44307e-04 |
1.293e+00 |
Auger electron |
|
5.83820e-04 |
1.367e-01 |
Auger electron |
|
1.31184e-03 |
4.175e-01 |
Auger electron |
|
1.49849e-03 |
3.516e-02 |
Auger electron |
|
2.44130e-03 |
2.867e+00 |
Auger electron |
|
2.56864e-03 |
2.862e-01 |
Auger electron |
|
2.91339e-03 |
5.388e-01 |
Auger electron |
|
3.10290e-03 |
5.879e-02 |
Auger electron |
|
3.53253e-03 |
3.171e-02 |
Auger electron |
|
1.02684e-02 |
7.167e-01 |
Auger electron |
|
1.08905e-02 |
6.979e-02 |
Auger electron |
|
1.36009e-02 |
3.646e-01 |
Auger electron |
|
1.44465e-02 |
3.626e-02 |
Auger electron |
|
1.69699e-02 |
4.370e-02 |
Auger electron |
|
2.22290e-02 |
4.878e-02 |
Conversion electron |
|
2.34620e-02 |
1.136e-02 |
Conversion electron |
|
2.41860e-02 |
3.312e-01 |
Conversion electron |
|
2.65290e-02 |
4.175e-02 |
Conversion electron |
|
2.80480e-02 |
2.919e-01 |
Conversion electron |
|
4.00501e-02 |
2.579e-02 |
Conversion electron |
|
4.09404e-02 |
1.754e-01 |
Conversion electron |
|
4.42200e-02 |
6.564e-02 |
Conversion electron |
|
4.52300e-02 |
6.170e-02 |
Conversion electron |
|
7.54320e-02 |
1.390e-02 |
Auger electron |
|
8.04490e-02 |
5.114e-02 |
Conversion electron |
|
8.24620e-02 |
1.794e-02 |
Conversion electron |
|
8.31860e-02 |
3.436e-01 |
Conversion electron |
|
8.47490e-02 |
3.336e-02 |
Conversion electron |
|
8.70480e-02 |
2.304e-01 |
Conversion electron |
|
9.82701e-02 |
2.455e-02 |
Conversion electron |
|
9.99404e-02 |
1.653e-01 |
Conversion electron |
|
1.04230e-01 |
5.810e-02 |
Conversion electron |
|
1.35979e-01 |
3.500e-02 |
Conversion electron |
|
1.38562e-01 |
2.167e-02 |
Conversion electron |
|
1.39286e-01 |
2.198e-01 |
Conversion electron |
|
1.40279e-01 |
1.870e-02 |
Conversion electron |
|
1.43148e-01 |
1.215e-01 |
Conversion electron |
|
1.53800e-01 |
1.596e-02 |
Conversion electron |
|
1.56040e-01 |
1.007e-01 |
Conversion electron |
|
1.60330e-01 |
3.562e-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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