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Radionuclide Dosimetric Data Sheets
Holmium-154m
Summary data
General
Classification
Isotope: Ho-154m
Atomic number (Z): 67
Mass number (A): 154
Neutron number (N): 87
Radioactive decay
Decay modes: α, β+, Electron capture
Half-life: 3.1 [m]
Decay constant: 3.7266e-03 [1/s]
Daughters: Dy-154 (100.0%), Tb-150m (0.001%)
Radioactive daughters: Dy-154, Tb-150m
Dosimetric constants
Mean alpha energy: 0.0 [MeV]
Mean electron energy: 0.54335 [MeV]
Mean photon energy: 2.4367 [MeV]
Air kerma rate constant, Γ10: 7.501e-17 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 9.106e-17 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 8.705e-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-:
8.705e-14 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 3.904e-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-154m 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-154m 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-154m Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
1.37110e-05 |
6.102e+00 |
X-ray |
|
1.22930e-03 |
1.167e-02 |
X-ray |
|
6.48150e-03 |
4.953e-02 |
X-ray |
|
7.25411e-03 |
3.318e-02 |
X-ray |
|
4.52703e-02 |
1.603e-01 |
X-ray |
|
4.60801e-02 |
2.865e-01 |
X-ray |
|
5.20302e-02 |
2.949e-02 |
X-ray |
|
5.21989e-02 |
5.700e-02 |
X-ray |
|
5.35696e-02 |
1.257e-02 |
X-ray |
|
2.80400e-01 |
1.315e-02 |
Gamma |
|
2.89400e-01 |
4.883e-02 |
Gamma |
|
3.09500e-01 |
3.850e-02 |
Gamma |
|
3.34600e-01 |
9.390e-01 |
Gamma |
|
3.46600e-01 |
9.860e-02 |
Gamma |
|
4.05800e-01 |
2.911e-02 |
Gamma |
|
4.06900e-01 |
1.897e-01 |
Gamma |
|
4.12400e-01 |
7.888e-01 |
Gamma |
|
4.34700e-01 |
2.535e-02 |
Gamma |
|
4.43300e-01 |
5.165e-02 |
Gamma |
|
4.77100e-01 |
5.540e-01 |
Gamma |
|
5.04600e-01 |
3.662e-02 |
Gamma |
|
5.04800e-01 |
1.268e-01 |
Gamma |
|
5.11000e-01 |
8.293e-01 |
Annihilation photon |
|
5.15600e-01 |
1.878e-02 |
Gamma |
|
5.23800e-01 |
1.831e-01 |
Gamma |
|
5.70600e-01 |
1.052e-01 |
Gamma |
|
6.61500e-01 |
1.784e-02 |
Gamma |
|
7.25100e-01 |
1.249e-01 |
Gamma |
|
7.32800e-01 |
3.099e-02 |
Gamma |
|
7.40600e-01 |
2.347e-02 |
Gamma |
|
7.98900e-01 |
1.409e-02 |
Gamma |
|
8.14100e-01 |
1.409e-01 |
Gamma |
|
9.05200e-01 |
1.690e-02 |
Gamma |
|
9.59100e-01 |
2.441e-02 |
Gamma |
|
9.68300e-01 |
2.535e-02 |
Gamma |
|
9.92900e-01 |
4.977e-02 |
Gamma |
|
9.99700e-01 |
2.347e-02 |
Gamma |
|
1.24880e+00 |
1.775e-01 |
Gamma |
|
1.12817e+00 |
3.276e-01 |
Positron |
|
1.26023e+00 |
1.140e-02 |
Positron |
|
1.36044e+00 |
1.852e-02 |
Positron |
|
1.46024e+00 |
4.986e-02 |
Positron |
|
1.81686e-05 |
3.378e-01 |
Auger electron |
|
1.28562e-04 |
2.785e+00 |
Auger electron |
|
1.55269e-04 |
1.369e-01 |
Auger electron |
|
2.09645e-04 |
4.483e-01 |
Auger electron |
|
6.58528e-04 |
8.930e-02 |
Auger electron |
|
1.01692e-03 |
9.701e-01 |
Auger electron |
|
1.19262e-03 |
5.276e-02 |
Auger electron |
|
5.12121e-03 |
3.471e-01 |
Auger electron |
|
6.38384e-03 |
1.221e-01 |
Auger electron |
|
7.68031e-03 |
1.082e-02 |
Auger electron |
|
3.70640e-02 |
2.281e-02 |
Auger electron |
|
4.39727e-02 |
1.141e-02 |
Auger electron |
|
2.80739e-01 |
3.339e-02 |
Conversion electron |
|
3.58539e-01 |
1.585e-02 |
Conversion electron |
|
4.50939e-01 |
1.009e-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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