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Radionuclide Dosimetric Data Sheets
Holmium-168
Summary data
General
Classification
Isotope: Ho-168
Atomic number (Z): 67
Mass number (A): 168
Neutron number (N): 101
Radioactive decay
Decay modes: β-
Half-life: 2.99 [m]
Decay constant: 3.8637e-03 [1/s]
Daughters: Er-168 (100.0%)
Radioactive daughters: None
Dosimetric constants
Mean alpha energy: 0.0 [MeV]
Mean electron energy: 0.81383 [MeV]
Mean photon energy: 0.87623 [MeV]
Air kerma rate constant, Γ10: 3.198e-17 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 3.198e-17 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 1.304e-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-:
1.304e-13 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 1.404e-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/Ho-168 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-168 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-168 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-168 Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
1.35271e-05 |
4.491e+00 |
X-ray |
|
1.36712e-03 |
1.096e-02 |
X-ray |
|
6.93539e-03 |
4.068e-02 |
X-ray |
|
7.81979e-03 |
3.761e-02 |
X-ray |
|
4.82994e-02 |
4.123e-02 |
X-ray |
|
4.92265e-02 |
7.317e-02 |
X-ray |
|
5.57777e-02 |
1.473e-02 |
X-ray |
|
7.98330e-02 |
7.935e-02 |
Gamma |
|
1.84275e-01 |
5.589e-02 |
Gamma |
|
1.98221e-01 |
2.622e-02 |
Gamma |
|
4.47461e-01 |
1.297e-02 |
Gamma |
|
6.31670e-01 |
3.209e-02 |
Gamma |
|
7.30580e-01 |
1.446e-02 |
Gamma |
|
7.41298e-01 |
3.657e-01 |
Gamma |
|
8.15903e-01 |
1.860e-01 |
Gamma |
|
8.21093e-01 |
3.450e-01 |
Gamma |
|
1.37185e+00 |
1.518e-02 |
Gamma |
|
2.35650e-01 |
1.874e-02 |
Beta |
|
4.95079e-01 |
2.536e-02 |
Beta |
|
6.85761e-01 |
1.604e-02 |
Beta |
|
7.28894e-01 |
1.874e-02 |
Beta |
|
7.72133e-01 |
1.834e-01 |
Beta |
|
8.04887e-01 |
6.956e-01 |
Beta |
|
1.05236e+00 |
1.504e-02 |
Beta |
|
1.98170e-05 |
2.151e-01 |
Auger electron |
|
1.41565e-04 |
2.022e+00 |
Auger electron |
|
1.97742e-04 |
7.139e-02 |
Auger electron |
|
2.36944e-04 |
3.400e-01 |
Auger electron |
|
7.07751e-04 |
4.294e-02 |
Auger electron |
|
1.13433e-03 |
7.636e-01 |
Auger electron |
|
1.30907e-03 |
3.787e-02 |
Auger electron |
|
5.48170e-03 |
2.620e-01 |
Auger electron |
|
6.85490e-03 |
9.337e-02 |
Auger electron |
|
2.22590e-02 |
1.318e-01 |
Conversion electron |
|
7.01168e-02 |
1.287e-02 |
Conversion electron |
|
7.05582e-02 |
1.568e-01 |
Conversion electron |
|
7.14856e-02 |
1.621e-01 |
Conversion electron |
|
7.80368e-02 |
8.116e-02 |
Conversion electron |
|
7.98330e-02 |
2.135e-02 |
Conversion electron |
|
1.26701e-01 |
1.149e-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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