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Radionuclide Dosimetric Data Sheets
Holmium-166m
Summary data
General
Classification
Isotope: Ho-166m
Atomic number (Z): 67
Mass number (A): 166
Neutron number (N): 99
Radioactive decay
Decay modes: β-
Half-life: 1200.0 [y]
Decay constant: 1.8304e-11 [1/s]
Daughters: Er-166 (100.0%)
Radioactive daughters: None
Dosimetric constants
Mean alpha energy: 0.0 [MeV]
Mean electron energy: 0.14973 [MeV]
Mean photon energy: 1.6249 [MeV]
Air kerma rate constant, Γ10: 5.971e-17 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 5.971e-17 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 2.399e-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-:
2.399e-14 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 2.603e-13
[Gy·kg/Bq·s]
Dose point kernels (plot)
Dose point kernel source: Graves, et al. Medical Physics. 2019 Nov.; 46(11):5284-5293.
Note: Bins are spaced every 0.1 mm until a radius of 10 cm, and every 1 mm until a radius of 2 m.
Download tabulated dose point kernel file here: www.mirdsoft.org/products/MIRDspecs/Ho-166m DPK.csv
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-166m 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-166m 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-166m Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
1.35308e-05 |
8.758e+00 |
X-ray |
|
1.36716e-03 |
2.132e-02 |
X-ray |
|
6.93539e-03 |
7.969e-02 |
X-ray |
|
7.81979e-03 |
7.151e-02 |
X-ray |
|
8.17512e-03 |
1.355e-02 |
X-ray |
|
9.09455e-03 |
1.265e-02 |
X-ray |
|
4.82994e-02 |
1.079e-01 |
X-ray |
|
4.92265e-02 |
1.914e-01 |
X-ray |
|
5.55821e-02 |
1.994e-02 |
X-ray |
|
5.57778e-02 |
3.853e-02 |
X-ray |
|
8.05860e-02 |
1.233e-01 |
Gamma |
|
1.84410e-01 |
7.260e-01 |
Gamma |
|
2.15890e-01 |
2.606e-02 |
Gamma |
|
2.59737e-01 |
1.089e-02 |
Gamma |
|
2.80459e-01 |
2.977e-01 |
Gamma |
|
3.00762e-01 |
3.732e-02 |
Gamma |
|
3.65747e-01 |
2.476e-02 |
Gamma |
|
4.10944e-01 |
1.141e-01 |
Gamma |
|
4.51521e-01 |
2.984e-02 |
Gamma |
|
4.64797e-01 |
1.212e-02 |
Gamma |
|
5.29801e-01 |
9.692e-02 |
Gamma |
|
5.70990e-01 |
5.547e-02 |
Gamma |
|
6.11550e-01 |
1.408e-02 |
Gamma |
|
6.70502e-01 |
5.481e-02 |
Gamma |
|
6.91249e-01 |
1.343e-02 |
Gamma |
|
7.11683e-01 |
5.532e-01 |
Gamma |
|
7.52285e-01 |
1.229e-01 |
Gamma |
|
7.78817e-01 |
3.078e-02 |
Gamma |
|
8.10276e-01 |
5.808e-01 |
Gamma |
|
8.30577e-01 |
9.816e-02 |
Gamma |
|
9.50967e-01 |
2.755e-02 |
Gamma |
|
8.18596e-03 |
1.741e-01 |
Beta |
|
1.88201e-02 |
7.513e-01 |
Beta |
|
2.01454e-01 |
2.222e-02 |
Beta |
|
3.16597e-01 |
1.190e-02 |
Beta |
|
4.64223e-01 |
2.940e-02 |
Beta |
|
1.98170e-05 |
4.205e-01 |
Auger electron |
|
1.41562e-04 |
3.942e+00 |
Auger electron |
|
1.98154e-04 |
1.393e-01 |
Auger electron |
|
2.36653e-04 |
6.637e-01 |
Auger electron |
|
7.15356e-04 |
9.029e-02 |
Auger electron |
|
1.13429e-03 |
1.486e+00 |
Auger electron |
|
1.30912e-03 |
7.369e-02 |
Auger electron |
|
5.48159e-03 |
5.113e-01 |
Auger electron |
|
6.85523e-03 |
1.823e-01 |
Auger electron |
|
8.26055e-03 |
1.642e-02 |
Auger electron |
|
2.30120e-02 |
2.022e-01 |
Conversion electron |
|
3.94671e-02 |
1.423e-02 |
Auger electron |
|
7.08698e-02 |
1.965e-02 |
Conversion electron |
|
7.13112e-02 |
2.332e-01 |
Conversion electron |
|
7.22386e-02 |
2.405e-01 |
Conversion electron |
|
7.87898e-02 |
1.207e-01 |
Conversion electron |
|
8.05860e-02 |
3.175e-02 |
Conversion electron |
|
1.26836e-01 |
1.489e-01 |
Conversion electron |
|
1.74694e-01 |
1.579e-02 |
Conversion electron |
|
1.75135e-01 |
3.109e-02 |
Conversion electron |
|
1.76063e-01 |
2.451e-02 |
Conversion electron |
|
1.82614e-01 |
1.711e-02 |
Conversion electron |
|
2.22885e-01 |
1.826e-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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