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Radionuclide Dosimetric Data Sheets
Holmium-166
Summary data
General
Classification
Isotope: Ho-166
Atomic number (Z): 67
Mass number (A): 166
Neutron number (N): 99
Radioactive decay
Decay modes: β-
Half-life: 26.8 [h]
Decay constant: 7.1844e-06 [1/s]
Daughters: Er-166 (100.0%)
Radioactive daughters: None
Dosimetric constants
Mean alpha energy: 0.0 [MeV]
Mean electron energy: 0.69633 [MeV]
Mean photon energy: 0.03007 [MeV]
Air kerma rate constant, Γ10: 1.055e-18 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 1.055e-18 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 1.116e-13 [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-:
1.116e-13 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 4.818e-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/Ho-166 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/Ho-166 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/Ho-166 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/Ho-166 Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
1.35263e-05 |
3.468e+00 |
X-ray |
|
6.93539e-03 |
3.138e-02 |
X-ray |
|
7.81979e-03 |
2.922e-02 |
X-ray |
|
4.82994e-02 |
2.989e-02 |
X-ray |
|
4.92265e-02 |
5.304e-02 |
X-ray |
|
5.57777e-02 |
1.068e-02 |
X-ray |
|
8.05740e-02 |
6.710e-02 |
Gamma |
|
6.50868e-01 |
4.870e-01 |
Beta |
|
6.93507e-01 |
5.000e-01 |
Beta |
|
1.98170e-05 |
1.661e-01 |
Auger electron |
|
1.41566e-04 |
1.561e+00 |
Auger electron |
|
1.97655e-04 |
5.513e-02 |
Auger electron |
|
2.37013e-04 |
2.625e-01 |
Auger electron |
|
7.05973e-04 |
3.263e-02 |
Auger electron |
|
1.13435e-03 |
5.900e-01 |
Auger electron |
|
1.30906e-03 |
2.926e-02 |
Auger electron |
|
5.48192e-03 |
2.023e-01 |
Auger electron |
|
6.85504e-03 |
7.210e-02 |
Auger electron |
|
2.30000e-02 |
1.100e-01 |
Conversion electron |
|
7.08578e-02 |
1.069e-02 |
Conversion electron |
|
7.12992e-02 |
1.270e-01 |
Conversion electron |
|
7.22266e-02 |
1.309e-01 |
Conversion electron |
|
7.87778e-02 |
6.569e-02 |
Conversion electron |
|
8.05740e-02 |
1.728e-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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