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Radionuclide Dosimetric Data Sheets
Erbium-156
Summary data
General
Classification
Isotope: Er-156
Atomic number (Z): 68
Mass number (A): 156
Neutron number (N): 88
Radioactive decay
Decay modes: Electron capture
Half-life: 19.5 [m]
Decay constant: 5.9243e-04 [1/s]
Daughters: Ho-156 (100.0%)
Radioactive daughters: Ho-156
Dosimetric constants
Mean alpha energy: 0.0 [MeV]
Mean electron energy: 0.09432 [MeV]
Mean photon energy: 0.06781 [MeV]
Air kerma rate constant, Γ10: 4.054e-18 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 4.054e-18 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 1.511e-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-:
1.511e-14 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 1.086e-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-156 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-156 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-156 Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
1.36514e-05 |
2.673e+01 |
X-ray |
|
1.30159e-03 |
5.462e-02 |
X-ray |
|
5.95920e-03 |
1.624e-02 |
X-ray |
|
6.66650e-03 |
2.430e-02 |
X-ray |
|
6.70640e-03 |
2.147e-01 |
X-ray |
|
7.44982e-03 |
2.674e-02 |
X-ray |
|
7.53349e-03 |
1.042e-01 |
X-ray |
|
7.63171e-03 |
3.683e-02 |
X-ray |
|
7.89547e-03 |
3.642e-02 |
X-ray |
|
8.72000e-03 |
1.690e-02 |
Gamma |
|
8.75507e-03 |
1.836e-02 |
X-ray |
|
2.98600e-02 |
4.758e-02 |
Gamma |
|
3.53700e-02 |
2.600e-01 |
Gamma |
|
4.67702e-02 |
2.299e-01 |
X-ray |
|
4.76373e-02 |
4.094e-01 |
X-ray |
|
5.37885e-02 |
4.241e-02 |
X-ray |
|
5.39705e-02 |
8.197e-02 |
X-ray |
|
5.53966e-02 |
1.813e-02 |
X-ray |
|
1.33510e-01 |
1.222e-02 |
Gamma |
|
1.85890e-01 |
1.300e-02 |
Gamma |
|
3.87370e-01 |
1.196e-02 |
Gamma |
|
1.89749e-05 |
1.423e+00 |
Auger electron |
|
4.43500e-05 |
1.102e-02 |
Auger electron |
|
1.34672e-04 |
1.220e+01 |
Auger electron |
|
1.82965e-04 |
5.033e-01 |
Auger electron |
|
2.21926e-04 |
2.123e+00 |
Auger electron |
|
6.58301e-04 |
1.189e-01 |
Conversion electron |
|
7.26926e-04 |
6.374e-01 |
Auger electron |
|
1.07678e-03 |
4.150e+00 |
Auger electron |
|
1.25784e-03 |
2.183e-01 |
Auger electron |
|
1.44972e-03 |
1.115e-02 |
Auger electron |
|
5.32843e-03 |
1.441e+00 |
Auger electron |
|
6.65468e-03 |
5.114e-01 |
Auger electron |
|
6.99150e-03 |
5.419e-02 |
Conversion electron |
|
8.01698e-03 |
4.580e-02 |
Auger electron |
|
8.72000e-03 |
1.285e-02 |
Conversion electron |
|
2.04998e-02 |
5.018e-01 |
Conversion electron |
|
2.09313e-02 |
5.627e-02 |
Conversion electron |
|
2.17983e-02 |
2.099e-02 |
Conversion electron |
|
2.60098e-02 |
8.558e-02 |
Conversion electron |
|
2.64413e-02 |
4.782e-02 |
Conversion electron |
|
2.73083e-02 |
6.649e-02 |
Conversion electron |
|
2.81315e-02 |
1.288e-01 |
Conversion electron |
|
2.98600e-02 |
3.623e-02 |
Conversion electron |
|
3.36415e-02 |
4.468e-02 |
Conversion electron |
|
3.53700e-02 |
1.177e-02 |
Conversion electron |
|
3.82545e-02 |
3.177e-02 |
Auger electron |
|
4.30098e-02 |
2.174e-01 |
Conversion electron |
|
4.34413e-02 |
2.755e-02 |
Conversion electron |
|
4.43083e-02 |
4.832e-01 |
Conversion electron |
|
4.54244e-02 |
1.598e-02 |
Auger electron |
|
5.06415e-02 |
2.035e-01 |
Conversion electron |
|
5.23700e-02 |
5.615e-02 |
Conversion electron |
|
7.78110e-02 |
1.217e-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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