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Radionuclide Dosimetric Data Sheets
Erbium-165
Summary data
General
Classification
Isotope: Er-165
Atomic number (Z): 68
Mass number (A): 165
Neutron number (N): 97
Radioactive decay
Decay modes: Electron capture
Half-life: 10.36 [h]
Decay constant: 1.8585e-05 [1/s]
Daughters: Ho-165 (100.0%)
Radioactive daughters: None
Dosimetric constants
Mean alpha energy: 0.0 [MeV]
Mean electron energy: 0.00799 [MeV]
Mean photon energy: 0.03788 [MeV]
Air kerma rate constant, Γ10: 2.021e-18 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 2.021e-18 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 1.280e-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-:
1.280e-15 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 6.069e-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/Er-165 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-165 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/Er-165 Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
1.36278e-05 |
8.334e+00 |
X-ray |
|
1.29909e-03 |
1.764e-02 |
X-ray |
|
6.70641e-03 |
7.085e-02 |
X-ray |
|
7.53351e-03 |
4.783e-02 |
X-ray |
|
7.89548e-03 |
1.202e-02 |
X-ray |
|
4.67702e-02 |
2.155e-01 |
X-ray |
|
4.76373e-02 |
3.838e-01 |
X-ray |
|
5.37885e-02 |
3.975e-02 |
X-ray |
|
5.39705e-02 |
7.683e-02 |
X-ray |
|
5.53966e-02 |
1.699e-02 |
X-ray |
|
1.89749e-05 |
4.338e-01 |
Auger electron |
|
1.34806e-04 |
3.792e+00 |
Auger electron |
|
1.78756e-04 |
1.554e-01 |
Auger electron |
|
2.22072e-04 |
6.304e-01 |
Auger electron |
|
7.08314e-04 |
1.404e-01 |
Auger electron |
|
1.07495e-03 |
1.342e+00 |
Auger electron |
|
1.25193e-03 |
6.991e-02 |
Auger electron |
|
5.30881e-03 |
4.745e-01 |
Auger electron |
|
6.62935e-03 |
1.682e-01 |
Auger electron |
|
7.98388e-03 |
1.503e-02 |
Auger electron |
|
3.82545e-02 |
2.978e-02 |
Auger electron |
|
4.54244e-02 |
1.498e-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
MIRDsoft MIRDspecs version 20250101 (www.mirdsoft.org)
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