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Radionuclide Dosimetric Data Sheets
Plutonium-240
Summary data
General
Classification
Isotope: Pu-240
Atomic number (Z): 94
Mass number (A): 240
Neutron number (N): 146
Radioactive decay
Decay modes: α, Spontaneus fission
Half-life: 6564.0 [y]
Decay constant: 3.3463e-12 [1/s]
Daughters: U-236 (100.0%), SF (5.75e-06%)
Radioactive daughters: U-236
Dosimetric constants
Mean alpha energy: 5.2434 [MeV]
Mean electron energy: 0.01051 [MeV]
Mean photon energy: 0.00193 [MeV]
Air kerma rate constant, Γ10: 2.476e-18 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 2.476e-18 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 8.418e-13 [Gy·kg/Bq·s]
Equilibrium dose constant for alphas, Δα: 8.401e-13
[Gy·kg/Bq·s]
Equilibrium dose constant for betas/electrons, Δβ-,β+,e-:
1.684e-15 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 3.092e-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/Pu-240 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-240 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/Pu-240 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/Pu-240 Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
7.55204e-05 |
2.769e+00 |
X-ray |
|
3.25952e-03 |
1.691e-02 |
X-ray |
|
1.36268e-02 |
3.609e-02 |
X-ray |
|
1.73072e-02 |
3.723e-02 |
X-ray |
|
7.21886e-05 |
7.454e-01 |
Auger electron |
|
1.86273e-04 |
7.303e-01 |
Auger electron |
|
1.92426e-04 |
4.195e-01 |
Auger electron |
|
5.38625e-04 |
1.073e-01 |
Auger electron |
|
1.19196e-03 |
2.614e-02 |
Auger electron |
|
2.44333e-03 |
2.410e-01 |
Auger electron |
|
2.91589e-03 |
4.532e-02 |
Auger electron |
|
1.02618e-02 |
6.067e-02 |
Auger electron |
|
1.35918e-02 |
3.087e-02 |
Auger electron |
|
2.42000e-02 |
1.032e-01 |
Conversion electron |
|
2.80620e-02 |
9.095e-02 |
Conversion electron |
|
4.09544e-02 |
5.467e-02 |
Conversion electron |
|
4.52440e-02 |
1.923e-02 |
Conversion electron |
|
5.12368e+00 |
2.710e-01 |
Alpha |
|
5.16817e+00 |
7.281e-01 |
Alpha |
|
8.68985e-02 |
2.710e-01 |
Alpha recoil |
|
8.76530e-02 |
7.281e-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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