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Radionuclide Dosimetric Data Sheets
Selenium-70
Summary data
General
Classification
Isotope: Se-70
Atomic number (Z): 34
Mass number (A): 70
Neutron number (N): 36
Radioactive decay
Decay modes: β+, Electron capture
Half-life: 41.1 [m]
Decay constant: 2.8108e-04 [1/s]
Daughters: As-70 (100.0%)
Radioactive daughters: As-70
Dosimetric constants
Mean alpha energy: 0.0 [MeV]
Mean electron energy: 0.23745 [MeV]
Mean photon energy: 0.72112 [MeV]
Air kerma rate constant, Γ10: 5.245e-17 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 6.913e-17 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 3.804e-14 [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-:
3.804e-14 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 1.155e-13
[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-70 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-70 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/Se-70 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/Se-70 Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
1.42075e-05 |
1.360e+01 |
X-ray |
|
1.27775e-03 |
1.409e-02 |
X-ray |
|
1.04633e-02 |
2.362e-01 |
X-ray |
|
1.05007e-02 |
4.574e-01 |
X-ray |
|
1.16800e-02 |
3.122e-02 |
X-ray |
|
1.16852e-02 |
6.098e-02 |
X-ray |
|
3.20500e-02 |
1.921e-02 |
Gamma |
|
4.95100e-02 |
3.579e-01 |
Gamma |
|
1.13530e-01 |
1.571e-02 |
Gamma |
|
1.32540e-01 |
3.521e-02 |
Gamma |
|
1.35630e-01 |
2.619e-02 |
Gamma |
|
2.02730e-01 |
4.889e-02 |
Gamma |
|
2.44140e-01 |
2.852e-02 |
Gamma |
|
2.55860e-01 |
1.833e-02 |
Gamma |
|
2.63200e-01 |
2.764e-02 |
Gamma |
|
2.93590e-01 |
2.823e-02 |
Gamma |
|
3.76650e-01 |
9.428e-02 |
Gamma |
|
4.13910e-01 |
2.095e-02 |
Gamma |
|
4.26150e-01 |
2.910e-01 |
Gamma |
|
4.99690e-01 |
1.280e-02 |
Gamma |
|
5.11000e-01 |
8.616e-01 |
Annihilation photon |
|
3.01226e-01 |
1.113e-02 |
Positron |
|
3.54502e-01 |
1.396e-01 |
Positron |
|
4.52260e-01 |
2.346e-02 |
Positron |
|
5.20126e-01 |
2.488e-01 |
Positron |
|
2.23273e-05 |
6.417e+00 |
Auger electron |
|
5.24657e-05 |
2.360e+00 |
Auger electron |
|
9.74444e-05 |
3.527e-01 |
Auger electron |
|
1.15603e-03 |
1.998e+00 |
Auger electron |
|
1.22196e-03 |
7.046e-02 |
Auger electron |
|
9.06608e-03 |
4.800e-01 |
Auger electron |
|
1.02994e-02 |
1.363e-01 |
Auger electron |
|
1.15362e-02 |
1.008e-02 |
Auger electron |
|
2.02210e-02 |
7.014e-01 |
Conversion electron |
|
3.05308e-02 |
5.696e-02 |
Conversion electron |
|
3.06843e-02 |
6.589e-02 |
Conversion electron |
|
3.07217e-02 |
1.082e-01 |
Conversion electron |
|
3.19062e-02 |
3.584e-02 |
Conversion electron |
|
3.76810e-02 |
2.061e-01 |
Conversion electron |
|
4.79908e-02 |
2.127e-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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