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Radionuclide Dosimetric Data Sheets
Holmium-164
Summary data
General
Classification
Isotope: Ho-164
Atomic number (Z): 67
Mass number (A): 164
Neutron number (N): 97
Radioactive decay
Decay modes: β-, Electron capture
Half-life: 29.0 [m]
Decay constant: 3.9836e-04 [1/s]
Daughters: Dy-164 (60.0%), Er-164 (40.0%)
Radioactive daughters: None
Dosimetric constants
Mean alpha energy: 0.0 [MeV]
Mean electron energy: 0.14702 [MeV]
Mean photon energy: 0.02973 [MeV]
Air kerma rate constant, Γ10: 1.591e-18 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 1.591e-18 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 2.356e-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-:
2.356e-14 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 4.763e-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-164 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-164 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-164 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-164 Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
1.35289e-05 |
7.265e-01 |
X-ray |
|
1.37085e-05 |
6.485e+00 |
X-ray |
|
1.22930e-03 |
1.243e-02 |
X-ray |
|
6.48150e-03 |
5.199e-02 |
X-ray |
|
7.25411e-03 |
3.693e-02 |
X-ray |
|
4.52703e-02 |
1.447e-01 |
X-ray |
|
4.60801e-02 |
2.585e-01 |
X-ray |
|
4.92265e-02 |
1.437e-02 |
X-ray |
|
5.20302e-02 |
2.661e-02 |
X-ray |
|
5.21989e-02 |
5.144e-02 |
X-ray |
|
5.35696e-02 |
1.135e-02 |
X-ray |
|
7.33920e-02 |
1.884e-02 |
Gamma |
|
9.13900e-02 |
2.280e-02 |
Gamma |
|
2.86591e-01 |
1.200e-01 |
Beta |
|
3.22128e-01 |
2.800e-01 |
Beta |
|
1.81686e-05 |
3.583e-01 |
Auger electron |
|
1.98170e-05 |
3.483e-02 |
Auger electron |
|
1.28560e-04 |
2.960e+00 |
Auger electron |
|
1.41564e-04 |
3.270e-01 |
Auger electron |
|
1.54931e-04 |
1.456e-01 |
Auger electron |
|
1.97914e-04 |
1.155e-02 |
Auger electron |
|
2.10096e-04 |
4.767e-01 |
Auger electron |
|
2.36832e-04 |
5.500e-02 |
Auger electron |
|
6.54097e-04 |
9.042e-02 |
Auger electron |
|
1.01705e-03 |
1.033e+00 |
Auger electron |
|
1.13431e-03 |
1.234e-01 |
Auger electron |
|
1.19272e-03 |
5.617e-02 |
Auger electron |
|
5.12387e-03 |
3.680e-01 |
Auger electron |
|
5.48230e-03 |
4.241e-02 |
Auger electron |
|
6.38621e-03 |
1.295e-01 |
Auger electron |
|
6.85572e-03 |
1.512e-02 |
Auger electron |
|
7.68228e-03 |
1.147e-02 |
Auger electron |
|
1.95310e-02 |
4.003e-02 |
Conversion electron |
|
3.38160e-02 |
2.981e-02 |
Conversion electron |
|
3.70640e-02 |
2.058e-02 |
Auger electron |
|
4.39727e-02 |
1.030e-02 |
Auger electron |
|
6.48013e-02 |
4.599e-02 |
Conversion electron |
|
6.56110e-02 |
4.973e-02 |
Conversion electron |
|
7.17299e-02 |
2.401e-02 |
Conversion electron |
|
8.21152e-02 |
2.394e-02 |
Conversion electron |
|
8.30426e-02 |
2.384e-02 |
Conversion electron |
|
8.95938e-02 |
1.235e-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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