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Radionuclide Dosimetric Data Sheets
Erbium-161
Summary data
General
Classification
Isotope: Er-161
Atomic number (Z): 68
Mass number (A): 161
Neutron number (N): 93
Radioactive decay
Decay modes: β+, Electron capture
Half-life: 3.21 [h]
Decay constant: 5.9982e-05 [1/s]
Daughters: Ho-161 (100.0%)
Radioactive daughters: Ho-161
Dosimetric constants
Mean alpha energy: 0.0 [MeV]
Mean electron energy: 0.05222 [MeV]
Mean photon energy: 0.99052 [MeV]
Air kerma rate constant, Γ10: 3.637e-17 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 3.639e-17 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 8.367e-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-:
8.367e-15 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 1.587e-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/Er-161 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/Er-161 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/Er-161 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/Er-161 Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
1.36388e-05 |
1.232e+01 |
X-ray |
|
1.29992e-03 |
2.577e-02 |
X-ray |
|
6.66650e-03 |
1.109e-02 |
X-ray |
|
6.70641e-03 |
9.798e-02 |
X-ray |
|
7.53350e-03 |
7.213e-02 |
X-ray |
|
7.63171e-03 |
1.187e-02 |
X-ray |
|
7.89548e-03 |
1.662e-02 |
X-ray |
|
8.75507e-03 |
1.271e-02 |
X-ray |
|
4.67702e-02 |
2.668e-01 |
X-ray |
|
4.76373e-02 |
4.752e-01 |
X-ray |
|
5.37885e-02 |
4.922e-02 |
X-ray |
|
5.39705e-02 |
9.514e-02 |
X-ray |
|
5.53559e-02 |
1.087e-02 |
X-ray |
|
5.53966e-02 |
2.104e-02 |
X-ray |
|
2.01470e-01 |
1.122e-02 |
Gamma |
|
2.11150e-01 |
1.220e-01 |
Gamma |
|
3.14770e-01 |
2.489e-02 |
Gamma |
|
5.92600e-01 |
3.660e-02 |
Gamma |
|
8.26600e-01 |
6.405e-01 |
Gamma |
|
8.64900e-01 |
1.293e-02 |
Gamma |
|
9.31700e-01 |
1.818e-02 |
Gamma |
|
1.89749e-05 |
6.449e-01 |
Auger electron |
|
1.34744e-04 |
5.608e+00 |
Auger electron |
|
1.79879e-04 |
2.316e-01 |
Auger electron |
|
2.23095e-04 |
9.466e-01 |
Auger electron |
|
7.12610e-04 |
2.407e-01 |
Auger electron |
|
1.07591e-03 |
1.958e+00 |
Auger electron |
|
1.25431e-03 |
1.023e-01 |
Auger electron |
|
1.92180e-03 |
1.292e-01 |
Conversion electron |
|
2.35330e-03 |
1.253e-02 |
Conversion electron |
|
5.33794e-03 |
6.908e-01 |
Auger electron |
|
6.66129e-03 |
2.452e-01 |
Auger electron |
|
8.01980e-03 |
2.195e-02 |
Auger electron |
|
9.55350e-03 |
3.220e-02 |
Conversion electron |
|
2.05310e-02 |
4.111e-02 |
Conversion electron |
|
3.18310e-02 |
1.258e-02 |
Conversion electron |
|
3.82545e-02 |
3.687e-02 |
Auger electron |
|
3.84310e-02 |
2.439e-02 |
Conversion electron |
|
4.54244e-02 |
1.855e-02 |
Auger electron |
|
1.55451e-01 |
5.533e-02 |
Conversion electron |
|
2.02221e-01 |
4.085e-02 |
Conversion electron |
|
2.03088e-01 |
2.536e-02 |
Conversion electron |
|
2.09422e-01 |
1.808e-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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