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Radionuclide Dosimetric Data Sheets
Thulium-172
Summary data
General
Classification
Isotope: Tm-172
Atomic number (Z): 69
Mass number (A): 172
Neutron number (N): 103
Radioactive decay
Decay modes: β-
Half-life: 63.6 [h]
Decay constant: 3.0274e-06 [1/s]
Daughters: Yb-172 (100.0%)
Radioactive daughters: None
Dosimetric constants
Mean alpha energy: 0.0 [MeV]
Mean electron energy: 0.53273 [MeV]
Mean photon energy: 0.47442 [MeV]
Air kerma rate constant, Γ10: 1.584e-17 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 1.584e-17 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 8.535e-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-:
8.535e-14 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 7.601e-14
[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-172 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-172 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-172 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-172 Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
8.69213e-06 |
4.847e+00 |
X-ray |
|
1.50248e-03 |
1.207e-02 |
X-ray |
|
7.40528e-03 |
4.161e-02 |
X-ray |
|
8.41451e-03 |
4.013e-02 |
X-ray |
|
5.14483e-02 |
2.964e-02 |
X-ray |
|
5.25072e-02 |
5.223e-02 |
X-ray |
|
5.95058e-02 |
1.064e-02 |
X-ray |
|
7.87500e-02 |
6.540e-02 |
Gamma |
|
1.81520e-01 |
2.754e-02 |
Gamma |
|
9.12064e-01 |
1.416e-02 |
Gamma |
|
1.09359e+00 |
6.000e-02 |
Gamma |
|
1.38709e+00 |
5.580e-02 |
Gamma |
|
1.46586e+00 |
4.500e-02 |
Gamma |
|
1.47028e+00 |
1.866e-02 |
Gamma |
|
1.52964e+00 |
5.100e-02 |
Gamma |
|
1.60837e+00 |
4.140e-02 |
Gamma |
|
5.94967e-02 |
1.303e-02 |
Beta |
|
7.58724e-02 |
1.003e-01 |
Beta |
|
9.43779e-02 |
2.406e-02 |
Beta |
|
1.17768e-01 |
1.113e-02 |
Beta |
|
1.21317e-01 |
1.013e-01 |
Beta |
|
2.24123e-01 |
6.617e-02 |
Beta |
|
5.83717e-01 |
1.203e-02 |
Beta |
|
6.67861e-01 |
3.609e-01 |
Beta |
|
6.90822e-01 |
2.907e-01 |
Beta |
|
9.31663e-06 |
4.208e-01 |
Auger electron |
|
1.88608e-05 |
5.971e-01 |
Auger electron |
|
1.54792e-04 |
1.756e+00 |
Auger electron |
|
2.43162e-04 |
5.288e-02 |
Auger electron |
|
2.64624e-04 |
3.086e-01 |
Auger electron |
|
8.16420e-04 |
3.458e-02 |
Auger electron |
|
1.25901e-03 |
7.134e-01 |
Auger electron |
|
1.43260e-03 |
3.230e-02 |
Auger electron |
|
5.84924e-03 |
2.369e-01 |
Auger electron |
|
7.34044e-03 |
8.549e-02 |
Auger electron |
|
1.73090e-02 |
9.977e-02 |
Conversion electron |
|
6.82960e-02 |
1.043e-02 |
Conversion electron |
|
6.87574e-02 |
1.651e-01 |
Conversion electron |
|
6.98162e-02 |
1.674e-01 |
Conversion electron |
|
7.68148e-02 |
8.496e-02 |
Conversion electron |
|
7.87500e-02 |
2.242e-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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