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Radionuclide Dosimetric Data Sheets
Holmium-155
Summary data
General
Classification
Isotope: Ho-155
Atomic number (Z): 67
Mass number (A): 155
Neutron number (N): 88
Radioactive decay
Decay modes: β+, Electron capture
Half-life: 48.0 [m]
Decay constant: 2.4068e-04 [1/s]
Daughters: Dy-155 (100.0%)
Radioactive daughters: Dy-155
Dosimetric constants
Mean alpha energy: 0.0 [MeV]
Mean electron energy: 0.21756 [MeV]
Mean photon energy: 0.61419 [MeV]
Air kerma rate constant, Γ10: 1.534e-17 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 2.284e-17 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 3.486e-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-:
3.486e-14 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 9.840e-14
[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-155 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-155 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-155 Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
1.37309e-05 |
1.354e+01 |
X-ray |
|
1.23104e-03 |
2.528e-02 |
X-ray |
|
6.44440e-03 |
1.112e-02 |
X-ray |
|
6.48150e-03 |
9.833e-02 |
X-ray |
|
7.25410e-03 |
7.251e-02 |
X-ray |
|
7.35039e-03 |
1.283e-02 |
X-ray |
|
7.62077e-03 |
1.664e-02 |
X-ray |
|
8.42364e-03 |
1.272e-02 |
X-ray |
|
3.78000e-02 |
1.337e-02 |
Gamma |
|
3.93900e-02 |
3.313e-02 |
Gamma |
|
4.52703e-02 |
2.262e-01 |
X-ray |
|
4.53800e-02 |
4.500e-02 |
Gamma |
|
4.60801e-02 |
4.043e-01 |
X-ray |
|
4.73700e-02 |
2.250e-02 |
Gamma |
|
5.20302e-02 |
4.161e-02 |
X-ray |
|
5.21989e-02 |
8.044e-02 |
X-ray |
|
5.35696e-02 |
1.774e-02 |
X-ray |
|
9.69100e-02 |
1.038e-02 |
Gamma |
|
1.03890e-01 |
2.175e-02 |
Gamma |
|
1.36300e-01 |
5.000e-02 |
Gamma |
|
1.85130e-01 |
2.250e-02 |
Gamma |
|
2.00860e-01 |
1.525e-02 |
Gamma |
|
2.02410e-01 |
1.700e-02 |
Gamma |
|
2.08410e-01 |
1.613e-02 |
Gamma |
|
2.18930e-01 |
1.425e-02 |
Gamma |
|
2.40190e-01 |
1.250e-01 |
Gamma |
|
2.47770e-01 |
1.550e-02 |
Gamma |
|
2.62230e-01 |
1.125e-02 |
Gamma |
|
3.25400e-01 |
2.750e-02 |
Gamma |
|
4.08580e-01 |
1.238e-02 |
Gamma |
|
5.11000e-01 |
3.874e-01 |
Annihilation photon |
|
8.97140e-01 |
1.000e-02 |
Gamma |
|
1.03347e+00 |
1.063e-02 |
Gamma |
|
8.31405e-01 |
3.373e-02 |
Positron |
|
8.78003e-01 |
1.060e-02 |
Positron |
|
9.00274e-01 |
1.928e-02 |
Positron |
|
9.21593e-01 |
3.662e-02 |
Positron |
|
9.39332e-01 |
3.855e-02 |
Positron |
|
1.81686e-05 |
7.583e-01 |
Auger electron |
|
1.28439e-04 |
6.189e+00 |
Auger electron |
|
1.57390e-04 |
3.075e-01 |
Auger electron |
|
2.10970e-04 |
1.029e+00 |
Auger electron |
|
6.70531e-04 |
2.669e-01 |
Auger electron |
|
1.01864e-03 |
2.098e+00 |
Auger electron |
|
1.19703e-03 |
1.147e-01 |
Auger electron |
|
5.16673e-03 |
7.465e-01 |
Auger electron |
|
6.43427e-03 |
2.633e-01 |
Auger electron |
|
7.73780e-03 |
2.339e-02 |
Auger electron |
|
1.22590e-02 |
1.017e-02 |
Conversion electron |
|
3.03775e-02 |
1.344e-01 |
Conversion electron |
|
3.07993e-02 |
8.652e-02 |
Conversion electron |
|
3.16090e-02 |
9.408e-02 |
Conversion electron |
|
3.28890e-02 |
1.201e-02 |
Conversion electron |
|
3.70640e-02 |
3.218e-02 |
Auger electron |
|
3.77279e-02 |
7.274e-02 |
Conversion electron |
|
3.83575e-02 |
5.474e-02 |
Conversion electron |
|
3.87793e-02 |
1.059e-02 |
Conversion electron |
|
3.93900e-02 |
1.960e-02 |
Conversion electron |
|
4.30490e-02 |
2.312e-02 |
Conversion electron |
|
4.39727e-02 |
1.610e-02 |
Auger electron |
|
4.57079e-02 |
1.633e-02 |
Conversion electron |
|
8.24390e-02 |
4.218e-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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