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Radionuclide Dosimetric Data Sheets
Holmium-164m
Summary data
General
Classification
Isotope: Ho-164m
Atomic number (Z): 67
Mass number (A): 164
Neutron number (N): 97
Radioactive decay
Decay modes: Internal transition
Half-life: 38.0 [m]
Decay constant: 3.0401e-04 [1/s]
Daughters: Ho-164 (100.0%)
Radioactive daughters: Ho-164
Dosimetric constants
Mean alpha energy: 0.0 [MeV]
Mean electron energy: 0.09264 [MeV]
Mean photon energy: 0.04723 [MeV]
Air kerma rate constant, Γ10: 2.553e-18 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 2.553e-18 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 1.484e-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-:
1.484e-14 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 7.567e-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-164m 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-164m 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-164m Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
1.36515e-05 |
2.324e+01 |
X-ray |
|
1.30135e-03 |
4.780e-02 |
X-ray |
|
5.95920e-03 |
1.245e-02 |
X-ray |
|
6.66650e-03 |
1.863e-02 |
X-ray |
|
6.70640e-03 |
1.647e-01 |
X-ray |
|
7.44982e-03 |
2.007e-02 |
X-ray |
|
7.53349e-03 |
1.394e-01 |
X-ray |
|
7.63171e-03 |
2.764e-02 |
X-ray |
|
7.89548e-03 |
2.793e-02 |
X-ray |
|
8.75507e-03 |
2.456e-02 |
X-ray |
|
3.73400e-02 |
1.088e-01 |
Gamma |
|
4.67702e-02 |
2.098e-01 |
X-ray |
|
4.76373e-02 |
3.737e-01 |
X-ray |
|
5.37885e-02 |
3.871e-02 |
X-ray |
|
5.39705e-02 |
7.482e-02 |
X-ray |
|
5.53966e-02 |
1.655e-02 |
X-ray |
|
5.66400e-02 |
6.608e-02 |
Gamma |
|
1.89749e-05 |
1.227e+00 |
Auger electron |
|
1.34642e-04 |
1.060e+01 |
Auger electron |
|
1.81368e-04 |
4.424e-01 |
Auger electron |
|
2.24828e-04 |
1.835e+00 |
Auger electron |
|
7.16688e-04 |
5.342e-01 |
Auger electron |
|
9.41005e-04 |
7.736e-01 |
Conversion electron |
|
1.07755e-03 |
3.625e+00 |
Auger electron |
|
1.25831e-03 |
1.902e-01 |
Auger electron |
|
5.38129e-03 |
1.261e+00 |
Auger electron |
|
6.70856e-03 |
4.485e-01 |
Auger electron |
|
8.07264e-03 |
4.025e-02 |
Auger electron |
|
2.79798e-02 |
5.932e-01 |
Conversion electron |
|
2.84113e-02 |
6.846e-02 |
Conversion electron |
|
2.92783e-02 |
2.725e-02 |
Conversion electron |
|
3.56115e-02 |
1.533e-01 |
Conversion electron |
|
3.68613e-02 |
3.482e-01 |
Conversion electron |
|
3.73400e-02 |
4.303e-02 |
Conversion electron |
|
3.77283e-02 |
3.905e-01 |
Conversion electron |
|
3.82545e-02 |
2.900e-02 |
Auger electron |
|
4.40615e-02 |
2.026e-01 |
Conversion electron |
|
4.54244e-02 |
1.459e-02 |
Auger electron |
|
4.57900e-02 |
5.376e-02 |
Conversion electron |
|
4.72798e-02 |
1.059e-01 |
Conversion electron |
|
4.77113e-02 |
1.093e-02 |
Conversion electron |
|
5.49115e-02 |
2.666e-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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