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Radionuclide Dosimetric Data Sheets
Thulium-166
Summary data
General
Classification
Isotope: Tm-166
Atomic number (Z): 69
Mass number (A): 166
Neutron number (N): 97
Radioactive decay
Decay modes: β+, Electron capture
Half-life: 7.7 [h]
Decay constant: 2.5005e-05 [1/s]
Daughters: Er-166 (100.0%)
Radioactive daughters: None
Dosimetric constants
Mean alpha energy: 0.0 [MeV]
Mean electron energy: 0.08918 [MeV]
Mean photon energy: 1.97676 [MeV]
Air kerma rate constant, Γ10: 6.638e-17 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 6.690e-17 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 1.429e-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-:
1.429e-14 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 3.167e-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/Tm-166 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/Tm-166 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/Tm-166 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/Tm-166 Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
1.35449e-05 |
1.449e+01 |
X-ray |
|
1.36754e-03 |
3.485e-02 |
X-ray |
|
6.89239e-03 |
1.512e-02 |
X-ray |
|
6.93539e-03 |
1.336e-01 |
X-ray |
|
7.81980e-03 |
1.048e-01 |
X-ray |
|
8.17512e-03 |
2.272e-02 |
X-ray |
|
9.09455e-03 |
1.852e-02 |
X-ray |
|
4.82994e-02 |
2.865e-01 |
X-ray |
|
4.92265e-02 |
5.083e-01 |
X-ray |
|
5.55822e-02 |
5.295e-02 |
X-ray |
|
5.57777e-02 |
1.023e-01 |
X-ray |
|
5.72170e-02 |
1.172e-02 |
X-ray |
|
5.72611e-02 |
2.268e-02 |
X-ray |
|
8.05850e-02 |
1.142e-01 |
Gamma |
|
1.84405e-01 |
1.606e-01 |
Gamma |
|
2.15185e-01 |
5.235e-02 |
Gamma |
|
4.59600e-01 |
2.506e-02 |
Gamma |
|
5.11000e-01 |
2.645e-02 |
Annihilation photon |
|
5.94409e-01 |
3.459e-02 |
Gamma |
|
5.98764e-01 |
2.104e-02 |
Gamma |
|
6.72242e-01 |
6.124e-02 |
Gamma |
|
6.74788e-01 |
2.570e-02 |
Gamma |
|
6.91250e-01 |
7.390e-02 |
Gamma |
|
7.05333e-01 |
1.096e-01 |
Gamma |
|
7.57798e-01 |
2.330e-02 |
Gamma |
|
7.78814e-01 |
1.890e-01 |
Gamma |
|
7.85904e-01 |
9.904e-02 |
Gamma |
|
8.10290e-01 |
1.092e-02 |
Gamma |
|
8.75650e-01 |
4.063e-02 |
Gamma |
|
1.15235e+00 |
1.550e-02 |
Gamma |
|
1.17670e+00 |
9.545e-02 |
Gamma |
|
1.20387e+00 |
1.038e-02 |
Gamma |
|
1.23543e+00 |
1.852e-02 |
Gamma |
|
1.27354e+00 |
1.486e-01 |
Gamma |
|
1.30072e+00 |
1.332e-02 |
Gamma |
|
1.34704e+00 |
1.094e-02 |
Gamma |
|
1.37419e+00 |
5.594e-02 |
Gamma |
|
1.65276e+00 |
1.058e-02 |
Gamma |
|
1.86794e+00 |
4.045e-02 |
Gamma |
|
1.89512e+00 |
1.210e-02 |
Gamma |
|
2.05236e+00 |
1.720e-01 |
Gamma |
|
2.07953e+00 |
6.294e-02 |
Gamma |
|
2.09213e+00 |
1.561e-02 |
Gamma |
|
8.79022e-01 |
1.197e-02 |
Positron |
|
1.98170e-05 |
7.021e-01 |
Auger electron |
|
1.41537e-04 |
6.522e+00 |
Auger electron |
|
2.00012e-04 |
2.312e-01 |
Auger electron |
|
2.35628e-04 |
1.108e+00 |
Auger electron |
|
7.37863e-04 |
1.926e-01 |
Auger electron |
|
1.13430e-03 |
2.430e+00 |
Auger electron |
|
1.30991e-03 |
1.207e-01 |
Auger electron |
|
5.48039e-03 |
8.433e-01 |
Auger electron |
|
6.85582e-03 |
3.006e-01 |
Auger electron |
|
8.26345e-03 |
2.709e-02 |
Auger electron |
|
2.30110e-02 |
1.871e-01 |
Conversion electron |
|
3.94671e-02 |
3.778e-02 |
Auger electron |
|
4.69039e-02 |
1.911e-02 |
Auger electron |
|
7.08688e-02 |
1.818e-02 |
Conversion electron |
|
7.13102e-02 |
2.159e-01 |
Conversion electron |
|
7.22376e-02 |
2.226e-01 |
Conversion electron |
|
7.87888e-02 |
1.117e-01 |
Conversion electron |
|
8.05850e-02 |
2.938e-02 |
Conversion electron |
|
1.26831e-01 |
3.296e-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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