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Radionuclide Dosimetric Data Sheets
Plutonium-237
Summary data
General
Classification
Isotope: Pu-237
Atomic number (Z): 94
Mass number (A): 237
Neutron number (N): 143
Radioactive decay
Decay modes: α, Electron capture
Half-life: 45.2 [d]
Decay constant: 1.7749e-07 [1/s]
Daughters: Np-237 (100.0%), U-233 (0.0042%)
Radioactive daughters: Np-237, U-233
Dosimetric constants
Mean alpha energy: 0.0002 [MeV]
Mean electron energy: 0.01714 [MeV]
Mean photon energy: 0.05365 [MeV]
Air kerma rate constant, Γ10: 1.211e-17 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 1.211e-17 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 2.778e-15 [Gy·kg/Bq·s]
Equilibrium dose constant for alphas, Δα: 3.204e-17
[Gy·kg/Bq·s]
Equilibrium dose constant for betas/electrons, Δβ-,β+,e-:
2.746e-15 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 8.596e-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/Pu-237 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/Pu-237 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/Pu-237 Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
7.44065e-05 |
1.442e+01 |
X-ray |
|
3.34879e-03 |
8.932e-02 |
X-ray |
|
1.19138e-02 |
1.299e-02 |
X-ray |
|
1.37668e-02 |
2.090e-02 |
X-ray |
|
1.39579e-02 |
1.836e-01 |
X-ray |
|
1.68587e-02 |
3.879e-02 |
X-ray |
|
1.70745e-02 |
2.728e-02 |
X-ray |
|
1.78428e-02 |
8.139e-02 |
X-ray |
|
1.80184e-02 |
2.307e-02 |
X-ray |
|
2.08890e-02 |
1.860e-02 |
X-ray |
|
5.95412e-02 |
3.280e-02 |
Gamma |
|
9.74979e-02 |
1.244e-01 |
X-ray |
|
1.01574e-01 |
1.979e-01 |
X-ray |
|
1.13834e-01 |
2.289e-02 |
X-ray |
|
1.14778e-01 |
4.481e-02 |
X-ray |
|
1.18129e-01 |
1.167e-02 |
X-ray |
|
7.89621e-05 |
4.231e+00 |
Auger electron |
|
1.70002e-04 |
2.513e-02 |
Auger electron |
|
1.91171e-04 |
2.187e+00 |
Auger electron |
|
2.09854e-04 |
3.786e+00 |
Auger electron |
|
5.83882e-04 |
6.328e-01 |
Auger electron |
|
1.64811e-03 |
3.816e-01 |
Auger electron |
|
2.48973e-03 |
1.223e+00 |
Auger electron |
|
2.99185e-03 |
2.396e-01 |
Auger electron |
|
3.63258e-03 |
1.429e-02 |
Auger electron |
|
1.04457e-02 |
2.835e-01 |
Auger electron |
|
1.07550e-02 |
9.284e-02 |
Conversion electron |
|
1.38896e-02 |
1.455e-01 |
Auger electron |
|
1.73787e-02 |
1.759e-02 |
Auger electron |
|
2.87734e-02 |
2.524e-02 |
Conversion electron |
|
3.71012e-02 |
1.005e-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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