<= Return to MIRDspec isotope database
Radionuclide Dosimetric Data Sheets
Selenium-71
Summary data
General
Classification
Isotope: Se-71
Atomic number (Z): 34
Mass number (A): 71
Neutron number (N): 37
Radioactive decay
Decay modes: β+, Electron capture
Half-life: 4.74 [m]
Decay constant: 2.4372e-03 [1/s]
Daughters: As-71 (100.0%)
Radioactive daughters: As-71
Dosimetric constants
Mean alpha energy: 0.0 [MeV]
Mean electron energy: 1.38435 [MeV]
Mean photon energy: 1.60563 [MeV]
Air kerma rate constant, Γ10: 2.318e-17 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 6.026e-17 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 2.218e-13 [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-:
2.218e-13 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 2.573e-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-71 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-71 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-71 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-71 Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
1.42084e-05 |
4.929e-01 |
X-ray |
|
1.05007e-02 |
1.773e-02 |
X-ray |
|
1.43200e-01 |
2.280e-02 |
Gamma |
|
1.47500e-01 |
4.750e-01 |
Gamma |
|
3.58800e-01 |
1.758e-02 |
Gamma |
|
5.11000e-01 |
1.916e+00 |
Annihilation photon |
|
7.22900e-01 |
2.612e-02 |
Gamma |
|
8.30330e-01 |
9.738e-02 |
Gamma |
|
8.42990e-01 |
1.140e-02 |
Gamma |
|
8.70300e-01 |
6.603e-02 |
Gamma |
|
9.77850e-01 |
1.216e-02 |
Gamma |
|
1.09526e+00 |
9.832e-02 |
Gamma |
|
1.09882e+00 |
1.378e-02 |
Gamma |
|
1.24259e+00 |
7.196e-02 |
Gamma |
|
7.82052e-01 |
1.087e-02 |
Positron |
|
1.03092e+00 |
1.416e-02 |
Positron |
|
1.12463e+00 |
1.716e-01 |
Positron |
|
1.24312e+00 |
2.434e-02 |
Positron |
|
1.24910e+00 |
1.057e-01 |
Positron |
|
1.29989e+00 |
8.878e-02 |
Positron |
|
1.64382e+00 |
1.965e-01 |
Positron |
|
1.71444e+00 |
2.993e-01 |
Positron |
|
2.23273e-05 |
2.324e-01 |
Auger electron |
|
5.24626e-05 |
8.562e-02 |
Auger electron |
|
9.85339e-05 |
1.410e-02 |
Auger electron |
|
1.15643e-03 |
7.182e-02 |
Auger electron |
|
9.06608e-03 |
1.860e-02 |
Auger electron |
|
1.35671e-01 |
1.355e-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)
<= Return to MIRDspec isotope database
