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Radionuclide Dosimetric Data Sheets
Plutonium-244
Summary data
General
Classification
Isotope: Pu-244
Atomic number (Z): 94
Mass number (A): 244
Neutron number (N): 150
Radioactive decay
Decay modes: α, Spontaneus fission
Half-life: 80000000.0 [y]
Decay constant: 2.7456e-16 [1/s]
Daughters: U-240 (99.9%), SF (0.121%)
Radioactive daughters: U-240
Dosimetric constants
Mean alpha energy: 4.6513 [MeV]
Mean electron energy: 0.01974 [MeV]
Mean photon energy: 0.02112 [MeV]
Air kerma rate constant, Γ10: 1.760e-18 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 3.503e-18 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 7.484e-13 [Gy·kg/Bq·s]
Equilibrium dose constant for alphas, Δα: 7.452e-13
[Gy·kg/Bq·s]
Equilibrium dose constant for betas/electrons, Δβ-,β+,e-:
3.163e-15 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 3.384e-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-244 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-244 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-244 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-244 Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
7.55199e-05 |
1.967e+00 |
X-ray |
|
3.25939e-03 |
1.201e-02 |
X-ray |
|
1.36268e-02 |
2.571e-02 |
X-ray |
|
1.73072e-02 |
2.636e-02 |
X-ray |
|
7.21895e-05 |
5.295e-01 |
Auger electron |
|
1.86249e-04 |
5.187e-01 |
Auger electron |
|
1.92414e-04 |
2.980e-01 |
Auger electron |
|
5.38259e-04 |
7.620e-02 |
Auger electron |
|
1.19173e-03 |
1.850e-02 |
Auger electron |
|
2.44318e-03 |
1.712e-01 |
Auger electron |
|
2.91569e-03 |
3.220e-02 |
Auger electron |
|
1.02575e-02 |
4.313e-02 |
Auger electron |
|
1.35872e-02 |
2.194e-02 |
Auger electron |
|
2.29560e-02 |
7.333e-02 |
Conversion electron |
|
2.68180e-02 |
6.507e-02 |
Conversion electron |
|
3.97104e-02 |
3.894e-02 |
Conversion electron |
|
4.40000e-02 |
1.370e-02 |
Conversion electron |
|
4.54569e+00 |
1.938e-01 |
Alpha |
|
4.58897e+00 |
8.050e-01 |
Alpha |
|
7.58107e-02 |
1.938e-01 |
Alpha recoil |
|
7.65325e-02 |
8.050e-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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