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Radionuclide Dosimetric Data Sheets
Holmium-153m
Summary data
General
Classification
Isotope: Ho-153m
Atomic number (Z): 67
Mass number (A): 153
Neutron number (N): 86
Radioactive decay
Decay modes: α, β+, Electron capture
Half-life: 9.3 [m]
Decay constant: 1.2422e-03 [1/s]
Daughters: Dy-153 (99.8%), Tb-149 (0.18%)
Radioactive daughters: Dy-153, Tb-149
Dosimetric constants
Mean alpha energy: 0.0074 [MeV]
Mean electron energy: 0.69516 [MeV]
Mean photon energy: 1.06179 [MeV]
Air kerma rate constant, Γ10: 2.116e-17 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 3.999e-17 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 1.126e-13 [Gy·kg/Bq·s]
Equilibrium dose constant for alphas, Δα: 1.186e-15
[Gy·kg/Bq·s]
Equilibrium dose constant for betas/electrons, Δβ-,β+,e-:
1.114e-13 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 1.701e-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-153m 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-153m 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-153m Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
1.37052e-05 |
9.019e+00 |
X-ray |
|
1.22905e-03 |
1.735e-02 |
X-ray |
|
6.48150e-03 |
7.260e-02 |
X-ray |
|
7.25411e-03 |
5.296e-02 |
X-ray |
|
7.62077e-03 |
1.229e-02 |
X-ray |
|
4.52703e-02 |
2.004e-01 |
X-ray |
|
4.60801e-02 |
3.582e-01 |
X-ray |
|
5.20302e-02 |
3.686e-02 |
X-ray |
|
5.21989e-02 |
7.126e-02 |
X-ray |
|
5.35696e-02 |
1.572e-02 |
X-ray |
|
9.05000e-02 |
1.163e-02 |
Gamma |
|
1.08800e-01 |
2.013e-01 |
Gamma |
|
1.61800e-01 |
1.680e-01 |
Gamma |
|
1.98900e-01 |
1.477e-02 |
Gamma |
|
2.30200e-01 |
1.071e-01 |
Gamma |
|
2.59000e-01 |
2.234e-02 |
Gamma |
|
2.70700e-01 |
1.440e-01 |
Gamma |
|
3.66000e-01 |
1.847e-01 |
Gamma |
|
3.91700e-01 |
2.401e-02 |
Gamma |
|
4.20100e-01 |
3.232e-02 |
Gamma |
|
4.56600e-01 |
8.495e-02 |
Gamma |
|
5.11000e-01 |
9.726e-01 |
Annihilation photon |
|
5.51000e-01 |
1.662e-02 |
Gamma |
|
5.53700e-01 |
5.355e-02 |
Gamma |
|
5.65800e-01 |
4.063e-02 |
Gamma |
|
6.17300e-01 |
5.522e-02 |
Gamma |
|
6.85200e-01 |
1.810e-02 |
Gamma |
|
6.98300e-01 |
1.662e-02 |
Gamma |
|
7.26200e-01 |
1.182e-02 |
Gamma |
|
7.81300e-01 |
3.546e-02 |
Gamma |
|
9.21900e-01 |
1.274e-02 |
Gamma |
|
9.25300e-01 |
4.266e-02 |
Gamma |
|
9.29000e-01 |
1.293e-02 |
Gamma |
|
1.01300e+00 |
1.200e-02 |
Gamma |
|
1.38010e+00 |
1.736e-02 |
Gamma |
|
1.18005e+00 |
5.396e-02 |
Positron |
|
1.20960e+00 |
6.864e-02 |
Positron |
|
1.26478e+00 |
9.392e-02 |
Positron |
|
1.31486e+00 |
1.499e-01 |
Positron |
|
1.38915e+00 |
1.199e-01 |
Positron |
|
1.81686e-05 |
4.972e-01 |
Auger electron |
|
1.28573e-04 |
4.115e+00 |
Auger electron |
|
1.54473e-04 |
2.024e-01 |
Auger electron |
|
2.10188e-04 |
6.598e-01 |
Auger electron |
|
6.49518e-04 |
1.186e-01 |
Auger electron |
|
1.01689e-03 |
1.442e+00 |
Auger electron |
|
1.19218e-03 |
7.836e-02 |
Auger electron |
|
5.12188e-03 |
5.137e-01 |
Auger electron |
|
6.38365e-03 |
1.807e-01 |
Auger electron |
|
7.67893e-03 |
1.601e-02 |
Auger electron |
|
3.70640e-02 |
2.851e-02 |
Auger electron |
|
4.39727e-02 |
1.426e-02 |
Auger electron |
|
5.49390e-02 |
1.800e-01 |
Conversion electron |
|
9.97875e-02 |
1.694e-02 |
Conversion electron |
|
1.00209e-01 |
7.801e-02 |
Conversion electron |
|
1.01019e-01 |
7.569e-02 |
Conversion electron |
|
1.07138e-01 |
4.082e-02 |
Conversion electron |
|
1.07939e-01 |
8.945e-02 |
Conversion electron |
|
1.08800e-01 |
1.075e-02 |
Conversion electron |
|
1.52788e-01 |
1.194e-02 |
Conversion electron |
|
1.76339e-01 |
2.148e-02 |
Conversion electron |
|
3.12139e-01 |
1.073e-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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