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Radionuclide Dosimetric Data Sheets
Thulium-164
Summary data
General
Classification
Isotope: Tm-164
Atomic number (Z): 69
Mass number (A): 164
Neutron number (N): 95
Radioactive decay
Decay modes: β+, Electron capture
Half-life: 2.0 [m]
Decay constant: 5.7762e-03 [1/s]
Daughters: Er-164 (100.0%)
Radioactive daughters: None
Dosimetric constants
Mean alpha energy: 0.0 [MeV]
Mean electron energy: 0.59935 [MeV]
Mean photon energy: 0.77604 [MeV]
Air kerma rate constant, Γ10: 1.167e-17 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 2.804e-17 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 9.603e-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-:
9.603e-14 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 1.243e-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-164 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-164 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-164 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-164 Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
1.35477e-05 |
6.805e+00 |
X-ray |
|
1.36753e-03 |
1.634e-02 |
X-ray |
|
6.93540e-03 |
6.333e-02 |
X-ray |
|
7.81980e-03 |
4.757e-02 |
X-ray |
|
8.17512e-03 |
1.077e-02 |
X-ray |
|
4.82994e-02 |
1.552e-01 |
X-ray |
|
4.92265e-02 |
2.753e-01 |
X-ray |
|
5.55822e-02 |
2.868e-02 |
X-ray |
|
5.57777e-02 |
5.543e-02 |
X-ray |
|
5.72611e-02 |
1.229e-02 |
X-ray |
|
9.14100e-02 |
6.700e-02 |
Gamma |
|
2.08040e-01 |
1.172e-02 |
Gamma |
|
5.11000e-01 |
8.457e-01 |
Annihilation photon |
|
7.68920e-01 |
1.340e-02 |
Gamma |
|
8.60290e-01 |
1.119e-02 |
Gamma |
|
1.15466e+00 |
1.655e-02 |
Gamma |
|
1.61071e+00 |
1.065e-02 |
Gamma |
|
1.67434e+00 |
1.039e-02 |
Gamma |
|
1.33543e+00 |
1.009e-01 |
Positron |
|
1.37730e+00 |
3.129e-01 |
Positron |
|
1.98170e-05 |
3.303e-01 |
Auger electron |
|
1.41537e-04 |
3.063e+00 |
Auger electron |
|
2.00351e-04 |
1.086e-01 |
Auger electron |
|
2.35237e-04 |
5.203e-01 |
Auger electron |
|
7.41511e-04 |
9.441e-02 |
Auger electron |
|
1.13419e-03 |
1.139e+00 |
Auger electron |
|
1.30982e-03 |
5.661e-02 |
Auger electron |
|
5.47788e-03 |
3.967e-01 |
Auger electron |
|
6.85355e-03 |
1.414e-01 |
Auger electron |
|
8.26148e-03 |
1.274e-02 |
Auger electron |
|
3.38360e-02 |
8.757e-02 |
Conversion electron |
|
3.94671e-02 |
2.046e-02 |
Auger electron |
|
4.69039e-02 |
1.035e-02 |
Auger electron |
|
8.21352e-02 |
7.028e-02 |
Conversion electron |
|
8.30626e-02 |
6.998e-02 |
Conversion electron |
|
8.96138e-02 |
3.625e-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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