<= Return to MIRDspec isotope database


Radionuclide Dosimetric Data Sheets

Plutonium-235

Summary data

General

Classification

Isotope:  Pu-235
Atomic number (Z):  94
Mass number (A):  235
Neutron number (N):  141

Radioactive decay

Decay modes:  α, Electron capture
Half-life:  25.3 [m]
Decay constant:  4.5662e-04 [1/s]
Daughters:  Np-235 (100.0%), U-231 (0.0027%)
Radioactive daughters:  Np-235, U-231

Dosimetric constants

Mean alpha energy:  0.0001 [MeV]
Mean electron energy:  0.02279 [MeV]
Mean photon energy:  0.09572 [MeV]
Air kerma rate constant, Γ10:  1.567e-17 [Gy·m2/Bq·s]
Air kerma coefficient, Kair:  1.567e-17 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or electrons), Δwp:  3.667e-15 [Gy·kg/Bq·s]
Equilibrium dose constant for alphas, Δα:  1.602e-17 [Gy·kg/Bq·s]
Equilibrium dose constant for betas/electrons, Δβ-,β+,e-:  3.651e-15 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp:  1.534e-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/Pu-235 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-235 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-235 Summary Spectrum.csv

 

Energy [MeV]

Yield [#/nt] if > 0.01

Radiation type

7.44234e-05

1.599e+01

X-ray

3.34699e-03

1.006e-01

X-ray

1.19138e-02

1.587e-02

X-ray

1.37668e-02

2.554e-02

X-ray

1.39579e-02

2.243e-01

X-ray

1.68587e-02

4.739e-02

X-ray

1.70745e-02

2.174e-02

X-ray

1.78427e-02

1.190e-01

X-ray

1.80184e-02

1.838e-02

X-ray

2.08890e-02

2.721e-02

X-ray

4.91000e-02

2.360e-02

Gamma

9.74979e-02

2.185e-01

X-ray

1.01574e-01

3.476e-01

X-ray

1.13834e-01

4.020e-02

X-ray

1.14778e-01

7.869e-02

X-ray

1.17881e-01

1.009e-02

X-ray

1.18129e-01

2.049e-02

X-ray

7.90053e-05

4.677e+00

Auger electron

1.69913e-04

2.781e-02

Auger electron

1.90360e-04

2.433e+00

Auger electron

2.08593e-04

4.203e+00

Auger electron

5.63781e-04

6.587e-01

Auger electron

1.61289e-03

3.368e-01

Auger electron

2.48774e-03

1.378e+00

Auger electron

2.98743e-03

2.696e-01

Auger electron

3.62525e-03

1.606e-02

Auger electron

1.03691e-02

3.379e-01

Auger electron

1.17600e-02

1.974e-01

Conversion electron

1.24980e-02

5.221e-02

Conversion electron

1.38027e-02

1.734e-01

Auger electron

1.65740e-02

2.993e-02

Conversion electron

1.72747e-02

2.093e-02

Auger electron

2.97784e-02

7.020e-02

Conversion electron

3.42000e-02

2.532e-02

Conversion electron

7.72522e-02

1.475e-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)

<= Return to MIRDspec isotope database