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Radionuclide Dosimetric Data Sheets
Holmium-154
Summary data
General
Classification
Isotope: Ho-154
Atomic number (Z): 67
Mass number (A): 154
Neutron number (N): 87
Radioactive decay
Decay modes: α, β+, Electron capture
Half-life: 11.76 [m]
Decay constant: 9.8235e-04 [1/s]
Daughters: Dy-154 (100.0%), Tb-150 (0.019%)
Radioactive daughters: Dy-154, Tb-150
Dosimetric constants
Mean alpha energy: 0.0007 [MeV]
Mean electron energy: 1.09266 [MeV]
Mean photon energy: 1.88173 [MeV]
Air kerma rate constant, Γ10: 4.417e-17 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 6.890e-17 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 1.752e-13 [Gy·kg/Bq·s]
Equilibrium dose constant for alphas, Δα: 1.122e-16
[Gy·kg/Bq·s]
Equilibrium dose constant for betas/electrons, Δβ-,β+,e-:
1.751e-13 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 3.015e-13
[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-154 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-154 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-154 Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
1.37110e-05 |
3.726e+00 |
X-ray |
|
6.48150e-03 |
3.024e-02 |
X-ray |
|
7.25411e-03 |
2.027e-02 |
X-ray |
|
4.52703e-02 |
9.770e-02 |
X-ray |
|
4.60801e-02 |
1.746e-01 |
X-ray |
|
5.20302e-02 |
1.797e-02 |
X-ray |
|
5.21989e-02 |
3.474e-02 |
X-ray |
|
3.26200e-01 |
4.725e-02 |
Gamma |
|
3.34600e-01 |
8.438e-01 |
Gamma |
|
3.46600e-01 |
1.004e-02 |
Gamma |
|
3.66200e-01 |
1.072e-02 |
Gamma |
|
4.12500e-01 |
1.502e-01 |
Gamma |
|
5.04900e-01 |
1.502e-02 |
Gamma |
|
5.11000e-01 |
1.278e+00 |
Annihilation photon |
|
5.69000e-01 |
1.114e-01 |
Gamma |
|
5.70000e-01 |
1.114e-01 |
Gamma |
|
6.92500e-01 |
5.147e-02 |
Gamma |
|
6.95500e-01 |
1.080e-02 |
Gamma |
|
7.29700e-01 |
1.232e-02 |
Gamma |
|
8.73400e-01 |
1.249e-01 |
Gamma |
|
9.05200e-01 |
2.194e-02 |
Gamma |
|
9.99700e-01 |
3.257e-02 |
Gamma |
|
1.02710e+00 |
5.738e-02 |
Gamma |
|
1.08590e+00 |
1.637e-02 |
Gamma |
|
1.17320e+00 |
1.781e-02 |
Gamma |
|
1.30060e+00 |
3.780e-02 |
Gamma |
|
1.42030e+00 |
2.034e-02 |
Gamma |
|
1.49830e+00 |
1.418e-02 |
Gamma |
|
1.51030e+00 |
1.865e-02 |
Gamma |
|
1.65650e+00 |
1.392e-02 |
Gamma |
|
1.83410e+00 |
1.004e-02 |
Gamma |
|
1.40113e+00 |
2.257e-02 |
Positron |
|
1.45986e+00 |
2.472e-02 |
Positron |
|
1.47618e+00 |
1.397e-02 |
Positron |
|
1.50012e+00 |
2.580e-02 |
Positron |
|
1.51401e+00 |
3.225e-02 |
Positron |
|
1.56149e+00 |
1.827e-02 |
Positron |
|
1.59833e+00 |
8.599e-02 |
Positron |
|
1.64842e+00 |
1.612e-02 |
Positron |
|
1.68225e+00 |
6.986e-02 |
Positron |
|
1.73894e+00 |
7.739e-02 |
Positron |
|
1.78853e+00 |
5.589e-02 |
Positron |
|
2.00546e+00 |
1.301e-01 |
Positron |
|
1.81686e-05 |
2.062e-01 |
Auger electron |
|
1.28562e-04 |
1.701e+00 |
Auger electron |
|
1.55269e-04 |
8.357e-02 |
Auger electron |
|
2.09648e-04 |
2.737e-01 |
Auger electron |
|
6.58474e-04 |
5.448e-02 |
Auger electron |
|
1.01692e-03 |
5.924e-01 |
Auger electron |
|
1.19262e-03 |
3.222e-02 |
Auger electron |
|
5.12117e-03 |
2.119e-01 |
Auger electron |
|
6.38380e-03 |
7.457e-02 |
Auger electron |
|
3.70640e-02 |
1.390e-02 |
Auger electron |
|
2.80739e-01 |
3.000e-02 |
Conversion electron |
|
3.43439e-01 |
1.027e-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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