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Radionuclide Dosimetric Data Sheets
Holmium-168m
Summary data
General
Classification
Isotope: Ho-168m
Atomic number (Z): 67
Mass number (A): 168
Neutron number (N): 101
Radioactive decay
Decay modes: Internal transition
Half-life: 132.0 [s]
Decay constant: 5.2511e-03 [1/s]
Daughters: Ho-168 (100.0%)
Radioactive daughters: Ho-168
Dosimetric constants
Mean alpha energy: 0.0 [MeV]
Mean electron energy: 0.05176 [MeV]
Mean photon energy: 0.00727 [MeV]
Air kerma rate constant, Γ10: 3.362e-19 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 3.362e-19 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 8.293e-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-:
8.293e-15 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 1.165e-15
[Gy·kg/Bq·s]
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-168m 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-168m Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
1.36191e-05 |
7.936e+00 |
X-ray |
|
1.30022e-03 |
1.661e-02 |
X-ray |
|
6.70640e-03 |
7.732e-02 |
X-ray |
|
7.53349e-03 |
1.950e-02 |
X-ray |
|
7.89547e-03 |
1.312e-02 |
X-ray |
|
4.67702e-02 |
3.574e-02 |
X-ray |
|
4.76373e-02 |
6.366e-02 |
X-ray |
|
5.39705e-02 |
1.274e-02 |
X-ray |
|
1.89749e-05 |
4.187e-01 |
Auger electron |
|
1.34822e-04 |
3.620e+00 |
Auger electron |
|
1.80812e-04 |
1.451e-01 |
Auger electron |
|
2.17968e-04 |
6.159e-01 |
Auger electron |
|
7.29152e-04 |
1.370e-01 |
Auger electron |
|
1.07457e-03 |
1.265e+00 |
Auger electron |
|
1.25293e-03 |
6.644e-02 |
Auger electron |
|
3.30101e-03 |
1.320e-01 |
Conversion electron |
|
5.22717e-03 |
4.360e-01 |
Auger electron |
|
6.54510e-03 |
1.540e-01 |
Auger electron |
|
7.89563e-03 |
1.372e-02 |
Auger electron |
|
4.96398e-02 |
2.091e-01 |
Conversion electron |
|
5.00713e-02 |
2.828e-02 |
Conversion electron |
|
5.09383e-02 |
4.042e-01 |
Conversion electron |
|
5.72715e-02 |
1.770e-01 |
Conversion electron |
|
5.90000e-02 |
4.895e-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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