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Radionuclide Dosimetric Data Sheets
Erbium-159
Summary data
General
Classification
Isotope: Er-159
Atomic number (Z): 68
Mass number (A): 159
Neutron number (N): 91
Radioactive decay
Decay modes: β+, Electron capture
Half-life: 36.0 [m]
Decay constant: 3.2090e-04 [1/s]
Daughters: Ho-159 (100.0%)
Radioactive daughters: Ho-159
Dosimetric constants
Mean alpha energy: 0.0 [MeV]
Mean electron energy: 0.07379 [MeV]
Mean photon energy: 0.9635 [MeV]
Air kerma rate constant, Γ10: 3.306e-17 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 3.495e-17 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 1.182e-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-:
1.182e-14 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 1.544e-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-159 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-159 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-159 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-159 Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
1.36460e-05 |
1.027e+01 |
X-ray |
|
1.30193e-03 |
2.151e-02 |
X-ray |
|
6.70641e-03 |
8.212e-02 |
X-ray |
|
7.53350e-03 |
5.836e-02 |
X-ray |
|
7.89548e-03 |
1.393e-02 |
X-ray |
|
8.75507e-03 |
1.028e-02 |
X-ray |
|
4.67702e-02 |
2.367e-01 |
X-ray |
|
4.76373e-02 |
4.216e-01 |
X-ray |
|
5.37885e-02 |
4.366e-02 |
X-ray |
|
5.39705e-02 |
8.440e-02 |
X-ray |
|
5.53966e-02 |
1.866e-02 |
X-ray |
|
1.65900e-01 |
5.010e-02 |
Gamma |
|
2.05920e-01 |
9.686e-02 |
Gamma |
|
2.11480e-01 |
1.169e-02 |
Gamma |
|
2.52300e-01 |
3.340e-02 |
Gamma |
|
3.14600e-01 |
1.169e-02 |
Gamma |
|
5.05400e-01 |
1.837e-02 |
Gamma |
|
5.11000e-01 |
9.763e-02 |
Annihilation photon |
|
5.51700e-01 |
2.338e-02 |
Gamma |
|
5.81000e-01 |
4.041e-02 |
Gamma |
|
6.24500e-01 |
3.340e-01 |
Gamma |
|
6.49100e-01 |
2.338e-01 |
Gamma |
|
9.42500e-01 |
1.069e-02 |
Gamma |
|
1.83830e+00 |
1.236e-02 |
Gamma |
|
1.89100e+00 |
1.035e-02 |
Gamma |
|
5.02388e-01 |
1.021e-02 |
Positron |
|
5.13233e-01 |
1.430e-02 |
Positron |
|
6.95277e-01 |
1.021e-02 |
Positron |
|
6.98348e-01 |
1.021e-02 |
Positron |
|
1.89749e-05 |
5.401e-01 |
Auger electron |
|
1.34698e-04 |
4.676e+00 |
Auger electron |
|
1.80713e-04 |
1.934e-01 |
Auger electron |
|
2.24193e-04 |
8.394e-01 |
Auger electron |
|
7.00626e-04 |
1.410e-01 |
Auger electron |
|
1.07779e-03 |
1.631e+00 |
Auger electron |
|
1.25934e-03 |
8.585e-02 |
Auger electron |
|
4.77150e-03 |
8.834e-02 |
Conversion electron |
|
5.30137e-03 |
5.468e-01 |
Auger electron |
|
6.50000e-03 |
2.486e-02 |
Conversion electron |
|
6.62033e-03 |
1.937e-01 |
Auger electron |
|
7.97269e-03 |
1.731e-02 |
Auger electron |
|
3.82545e-02 |
3.271e-02 |
Auger electron |
|
4.17510e-02 |
1.144e-02 |
Conversion electron |
|
4.54244e-02 |
1.646e-02 |
Auger electron |
|
1.50221e-01 |
4.757e-02 |
Conversion electron |
|
1.96991e-01 |
3.701e-02 |
Conversion electron |
|
1.97858e-01 |
2.328e-02 |
Conversion electron |
|
2.04192e-01 |
1.639e-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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