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Radionuclide Dosimetric Data Sheets
Erbium-171
Summary data
General
Classification
Isotope: Er-171
Atomic number (Z): 68
Mass number (A): 171
Neutron number (N): 103
Radioactive decay
Decay modes: β-
Half-life: 7.516 [h]
Decay constant: 2.5617e-05 [1/s]
Daughters: Tm-171 (100.0%)
Radioactive daughters: Tm-171
Dosimetric constants
Mean alpha energy: 0.0 [MeV]
Mean electron energy: 0.42045 [MeV]
Mean photon energy: 0.3731 [MeV]
Air kerma rate constant, Γ10: 1.372e-17 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 1.372e-17 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 6.736e-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-:
6.736e-14 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 5.978e-14
[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-171 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-171 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-171 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-171 Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
1.35925e-05 |
1.114e+01 |
X-ray |
|
1.45495e-03 |
2.639e-02 |
X-ray |
|
7.16830e-03 |
5.736e-02 |
X-ray |
|
8.11341e-03 |
4.125e-02 |
X-ray |
|
4.98586e-02 |
1.330e-01 |
X-ray |
|
5.08500e-02 |
2.352e-01 |
X-ray |
|
5.74128e-02 |
2.465e-02 |
X-ray |
|
5.76229e-02 |
4.763e-02 |
X-ray |
|
5.91642e-02 |
1.058e-02 |
X-ray |
|
1.11621e-01 |
2.050e-01 |
Gamma |
|
1.16656e-01 |
2.300e-02 |
Gamma |
|
1.24017e-01 |
9.100e-02 |
Gamma |
|
2.95901e-01 |
2.890e-01 |
Gamma |
|
3.08291e-01 |
6.440e-01 |
Gamma |
|
1.77474e-01 |
2.188e-02 |
Beta |
|
3.62261e-01 |
9.430e-01 |
Beta |
|
5.33426e-01 |
2.298e-02 |
Beta |
|
2.06752e-05 |
5.584e-01 |
Auger electron |
|
1.47233e-04 |
5.025e+00 |
Auger electron |
|
2.40264e-04 |
1.759e-01 |
Auger electron |
|
2.60952e-04 |
1.297e+00 |
Auger electron |
|
8.44641e-04 |
9.015e-02 |
Auger electron |
|
1.21773e-03 |
1.662e+00 |
Auger electron |
|
1.42738e-03 |
8.628e-02 |
Auger electron |
|
2.30400e-03 |
5.327e-02 |
Conversion electron |
|
3.15990e-03 |
7.123e-01 |
Conversion electron |
|
5.02500e-03 |
1.941e-01 |
Conversion electron |
|
5.66752e-03 |
3.393e-01 |
Auger electron |
|
7.10392e-03 |
1.218e-01 |
Auger electron |
|
8.57267e-03 |
1.108e-02 |
Auger electron |
|
1.05199e-02 |
1.420e-02 |
Conversion electron |
|
4.07026e-02 |
1.677e-02 |
Auger electron |
|
5.21330e-02 |
3.952e-01 |
Conversion electron |
|
5.71680e-02 |
1.656e-02 |
Conversion electron |
|
6.45290e-02 |
5.598e-02 |
Conversion electron |
|
1.01540e-01 |
5.448e-02 |
Conversion electron |
|
1.09756e-01 |
1.443e-02 |
Conversion electron |
|
1.14388e-01 |
2.547e-02 |
Conversion electron |
|
1.15379e-01 |
2.283e-02 |
Conversion electron |
|
1.22152e-01 |
1.312e-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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