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Radionuclide Dosimetric Data Sheets
Selenium-72
Summary data
General
Classification
Isotope: Se-72
Atomic number (Z): 34
Mass number (A): 72
Neutron number (N): 38
Radioactive decay
Decay modes: Electron capture
Half-life: 8.4 [d]
Decay constant: 9.5506e-07 [1/s]
Daughters: As-72 (100.0%)
Radioactive daughters: As-72
Dosimetric constants
Mean alpha energy: 0.0 [MeV]
Mean electron energy: 0.02275 [MeV]
Mean photon energy: 0.03432 [MeV]
Air kerma rate constant, Γ10: 3.900e-17 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 3.900e-17 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 3.645e-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-:
3.645e-15 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 5.499e-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/Se-72 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/Se-72 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/Se-72 Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
1.42084e-05 |
1.134e+01 |
X-ray |
|
1.27775e-03 |
1.168e-02 |
X-ray |
|
1.04633e-02 |
2.097e-01 |
X-ray |
|
1.05007e-02 |
4.061e-01 |
X-ray |
|
1.16800e-02 |
2.771e-02 |
X-ray |
|
1.16852e-02 |
5.413e-02 |
X-ray |
|
4.60000e-02 |
5.800e-01 |
Gamma |
|
2.23273e-05 |
5.346e+00 |
Auger electron |
|
5.24622e-05 |
1.970e+00 |
Auger electron |
|
9.85802e-05 |
3.256e-01 |
Auger electron |
|
1.15644e-03 |
1.651e+00 |
Auger electron |
|
1.22327e-03 |
5.851e-02 |
Auger electron |
|
9.06608e-03 |
4.261e-01 |
Auger electron |
|
1.02994e-02 |
1.210e-01 |
Auger electron |
|
3.41710e-02 |
3.840e-01 |
Conversion electron |
|
4.44808e-02 |
3.399e-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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