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Radionuclide Dosimetric Data Sheets

Curium-239

Summary data

General

Classification

Isotope:  Cm-239
Atomic number (Z):  96
Mass number (A):  239
Neutron number (N):  143

Radioactive decay

Decay modes:  β+, Electron capture
Half-life:  2.9 [h]
Decay constant:  6.6393e-05 [1/s]
Daughters:  Am-239 (100.0%)
Radioactive daughters:  Am-239

Dosimetric constants

Mean alpha energy:  0.0 [MeV]
Mean electron energy:  0.02907 [MeV]
Mean photon energy:  0.25927 [MeV]
Air kerma rate constant, Γ10:  1.951e-17 [Gy·m2/Bq·s]
Air kerma coefficient, Kair:  1.952e-17 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or electrons), Δwp:  4.658e-15 [Gy·kg/Bq·s]
Equilibrium dose constant for alphas, Δα:  0.000e+00 [Gy·kg/Bq·s]
Equilibrium dose constant for betas/electrons, Δβ-,β+,e-:  4.658e-15 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp:  4.154e-14 [Gy·kg/Bq·s]

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/Cm-239 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/Cm-239 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/Cm-239 Summary Spectrum.csv

 

Energy [MeV]

Yield [#/nt] if > 0.01

Radiation type

7.21488e-05

1.463e+01

X-ray

3.54536e-03

9.899e-02

X-ray

1.24249e-02

1.600e-02

X-ray

1.44234e-02

2.508e-02

X-ray

1.46345e-02

2.201e-01

X-ray

1.77003e-02

4.716e-02

X-ray

1.80853e-02

2.041e-02

X-ray

1.89584e-02

1.202e-01

X-ray

1.91415e-02

1.629e-02

X-ray

2.21841e-02

2.798e-02

X-ray

1.02508e-01

2.489e-01

X-ray

1.07043e-01

3.918e-01

X-ray

1.19828e-01

4.555e-02

X-ray

1.20885e-01

8.949e-02

X-ray

1.24142e-01

1.151e-02

X-ray

1.24423e-01

2.357e-02

X-ray

1.46400e-01

1.643e-01

Gamma

1.88000e-01

7.131e-01

Gamma

9.52855e-05

4.103e+00

Auger electron

1.83781e-04

2.441e-02

Auger electron

1.90292e-04

2.256e+00

Auger electron

2.59277e-04

3.843e+00

Auger electron

5.87262e-04

6.345e-01

Auger electron

1.89731e-03

2.851e-01

Auger electron

2.60904e-03

1.248e+00

Auger electron

3.17099e-03

2.661e-01

Auger electron

3.85018e-03

1.626e-02

Auger electron

1.08322e-02

3.068e-01

Auger electron

1.44816e-02

1.605e-01

Auger electron

1.71730e-02

1.331e-01

Conversion electron

1.79380e-02

1.447e-02

Conversion electron

1.81713e-02

1.970e-02

Auger electron

2.08300e-02

2.719e-02

Conversion electron

3.63145e-02

3.632e-02

Conversion electron

4.10000e-02

1.333e-02

Conversion electron

6.24300e-02

6.699e-02

Conversion electron

8.09925e-02

1.608e-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

 

 

 

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