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Radionuclide Dosimetric Data Sheets
Holmium-156
Summary data
General
Classification
Isotope: Ho-156
Atomic number (Z): 67
Mass number (A): 156
Neutron number (N): 89
Radioactive decay
Decay modes: β+, Electron capture
Half-life: 56.0 [m]
Decay constant: 2.0629e-04 [1/s]
Daughters: Dy-156 (100.0%)
Radioactive daughters: None
Dosimetric constants
Mean alpha energy: 0.0 [MeV]
Mean electron energy: 0.66547 [MeV]
Mean photon energy: 2.10637 [MeV]
Air kerma rate constant, Γ10: 5.682e-17 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 7.354e-17 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 1.066e-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-:
1.066e-13 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 3.375e-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-156 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-156 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-156 Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
1.37060e-05 |
9.198e+00 |
X-ray |
|
1.22906e-03 |
1.768e-02 |
X-ray |
|
6.48150e-03 |
7.404e-02 |
X-ray |
|
7.25411e-03 |
5.383e-02 |
X-ray |
|
7.62077e-03 |
1.253e-02 |
X-ray |
|
4.52703e-02 |
2.114e-01 |
X-ray |
|
4.60801e-02 |
3.777e-01 |
X-ray |
|
5.20302e-02 |
3.888e-02 |
X-ray |
|
5.21989e-02 |
7.516e-02 |
X-ray |
|
5.35696e-02 |
1.658e-02 |
X-ray |
|
1.37800e-01 |
5.110e-01 |
Gamma |
|
2.66380e-01 |
6.490e-01 |
Gamma |
|
3.66220e-01 |
1.426e-01 |
Gamma |
|
5.11000e-01 |
8.634e-01 |
Annihilation photon |
|
6.17880e-01 |
1.840e-02 |
Gamma |
|
6.84100e-01 |
6.796e-02 |
Gamma |
|
6.90860e-01 |
5.314e-02 |
Gamma |
|
7.52670e-01 |
1.686e-02 |
Gamma |
|
7.64120e-01 |
4.599e-02 |
Gamma |
|
8.84300e-01 |
8.380e-02 |
Gamma |
|
8.90440e-01 |
3.015e-02 |
Gamma |
|
9.31350e-01 |
3.679e-02 |
Gamma |
|
1.03070e+00 |
3.935e-02 |
Gamma |
|
1.12100e+00 |
1.533e-02 |
Gamma |
|
1.12180e+00 |
4.190e-02 |
Gamma |
|
1.22336e+00 |
2.862e-02 |
Gamma |
|
1.23072e+00 |
2.708e-02 |
Gamma |
|
1.30150e+00 |
1.318e-02 |
Gamma |
|
1.39033e+00 |
1.058e-02 |
Gamma |
|
1.45365e+00 |
1.277e-02 |
Gamma |
|
1.47150e+00 |
1.277e-02 |
Gamma |
|
2.02970e+00 |
1.109e-02 |
Gamma |
|
2.41920e+00 |
1.686e-02 |
Gamma |
|
1.14341e+00 |
1.087e-02 |
Positron |
|
1.18949e+00 |
1.567e-02 |
Positron |
|
1.26162e+00 |
1.469e-02 |
Positron |
|
1.27663e+00 |
1.880e-02 |
Positron |
|
1.35324e+00 |
2.938e-02 |
Positron |
|
1.39009e+00 |
3.036e-02 |
Positron |
|
1.42054e+00 |
3.133e-02 |
Positron |
|
1.46791e+00 |
1.371e-02 |
Positron |
|
1.49553e+00 |
1.665e-02 |
Positron |
|
1.52156e+00 |
4.896e-02 |
Positron |
|
1.70643e+00 |
9.792e-02 |
Positron |
|
1.81686e-05 |
5.073e-01 |
Auger electron |
|
1.28572e-04 |
4.197e+00 |
Auger electron |
|
1.54538e-04 |
2.065e-01 |
Auger electron |
|
2.10155e-04 |
6.730e-01 |
Auger electron |
|
6.50285e-04 |
1.223e-01 |
Auger electron |
|
1.01689e-03 |
1.470e+00 |
Auger electron |
|
1.19221e-03 |
7.988e-02 |
Auger electron |
|
5.12234e-03 |
5.240e-01 |
Auger electron |
|
6.38420e-03 |
1.844e-01 |
Auger electron |
|
7.67962e-03 |
1.633e-02 |
Auger electron |
|
3.70640e-02 |
3.007e-02 |
Auger electron |
|
4.39727e-02 |
1.504e-02 |
Auger electron |
|
8.39390e-02 |
2.412e-01 |
Conversion electron |
|
1.28788e-01 |
2.365e-02 |
Conversion electron |
|
1.29209e-01 |
6.700e-02 |
Conversion electron |
|
1.30019e-01 |
6.031e-02 |
Conversion electron |
|
1.36138e-01 |
3.584e-02 |
Conversion electron |
|
2.12519e-01 |
4.437e-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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