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Radionuclide Dosimetric Data Sheets
Holmium-161
Summary data
General
Classification
Isotope: Ho-161
Atomic number (Z): 67
Mass number (A): 161
Neutron number (N): 94
Radioactive decay
Decay modes: Electron capture
Half-life: 2.48 [h]
Decay constant: 7.7637e-05 [1/s]
Daughters: Dy-161 (100.0%)
Radioactive daughters: None
Dosimetric constants
Mean alpha energy: 0.0 [MeV]
Mean electron energy: 0.0336 [MeV]
Mean photon energy: 0.0582 [MeV]
Air kerma rate constant, Γ10: 4.904e-18 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 4.904e-18 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 5.383e-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-:
5.383e-15 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 9.325e-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-161 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-161 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/Ho-161 Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
1.37225e-05 |
1.558e+01 |
X-ray |
|
1.23034e-03 |
2.931e-02 |
X-ray |
|
6.44440e-03 |
1.328e-02 |
X-ray |
|
6.48150e-03 |
1.174e-01 |
X-ray |
|
7.25410e-03 |
8.281e-02 |
X-ray |
|
7.35039e-03 |
1.332e-02 |
X-ray |
|
7.62077e-03 |
1.987e-02 |
X-ray |
|
8.42364e-03 |
1.453e-02 |
X-ray |
|
2.56550e-02 |
2.730e-01 |
Gamma |
|
4.52703e-02 |
2.462e-01 |
X-ray |
|
4.60801e-02 |
4.400e-01 |
X-ray |
|
5.20302e-02 |
4.528e-02 |
X-ray |
|
5.21989e-02 |
8.753e-02 |
X-ray |
|
5.35696e-02 |
1.931e-02 |
X-ray |
|
7.74200e-02 |
1.911e-02 |
Gamma |
|
1.03050e-01 |
3.900e-02 |
Gamma |
|
1.81686e-05 |
8.697e-01 |
Auger electron |
|
1.28485e-04 |
7.117e+00 |
Auger electron |
|
1.56797e-04 |
3.524e-01 |
Auger electron |
|
2.10359e-04 |
1.168e+00 |
Auger electron |
|
6.68210e-04 |
2.846e-01 |
Auger electron |
|
1.01794e-03 |
2.435e+00 |
Auger electron |
|
1.19532e-03 |
1.328e-01 |
Auger electron |
|
5.15174e-03 |
8.664e-01 |
Auger electron |
|
6.41783e-03 |
3.054e-01 |
Auger electron |
|
7.71925e-03 |
2.710e-02 |
Auger electron |
|
1.66425e-02 |
1.783e-01 |
Conversion electron |
|
1.70643e-02 |
1.288e-01 |
Conversion electron |
|
1.78740e-02 |
1.878e-01 |
Conversion electron |
|
2.35590e-02 |
5.872e-02 |
Conversion electron |
|
2.39929e-02 |
1.108e-01 |
Conversion electron |
|
2.56550e-02 |
2.866e-02 |
Conversion electron |
|
3.47875e-02 |
1.160e-02 |
Conversion electron |
|
3.70640e-02 |
3.502e-02 |
Auger electron |
|
4.39727e-02 |
1.752e-02 |
Auger electron |
|
6.88293e-02 |
1.946e-02 |
Conversion electron |
|
6.96390e-02 |
2.036e-02 |
Conversion electron |
|
7.57579e-02 |
1.120e-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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