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Radionuclide Dosimetric Data Sheets
Thulium-161
Summary data
General
Classification
Isotope: Tm-161
Atomic number (Z): 69
Mass number (A): 161
Neutron number (N): 92
Radioactive decay
Decay modes: β+, Electron capture
Half-life: 30.2 [m]
Decay constant: 3.8253e-04 [1/s]
Daughters: Er-161 (100.0%)
Radioactive daughters: Er-161
Dosimetric constants
Mean alpha energy: 0.0 [MeV]
Mean electron energy: 0.23076 [MeV]
Mean photon energy: 1.2992 [MeV]
Air kerma rate constant, Γ10: 3.964e-17 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 4.523e-17 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 3.697e-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-:
3.697e-14 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 2.082e-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/Tm-161 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-161 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-161 Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
1.35594e-05 |
2.328e+01 |
X-ray |
|
1.36809e-03 |
5.525e-02 |
X-ray |
|
6.15850e-03 |
1.570e-02 |
X-ray |
|
6.89240e-03 |
2.402e-02 |
X-ray |
|
6.93540e-03 |
2.122e-01 |
X-ray |
|
7.72441e-03 |
1.343e-02 |
X-ray |
|
7.81980e-03 |
1.519e-01 |
X-ray |
|
7.92000e-03 |
1.827e-02 |
X-ray |
|
8.17513e-03 |
3.609e-02 |
X-ray |
|
9.09455e-03 |
2.686e-02 |
X-ray |
|
4.55400e-02 |
2.500e-01 |
Gamma |
|
4.82994e-02 |
5.467e-01 |
X-ray |
|
4.92265e-02 |
9.701e-01 |
X-ray |
|
5.55821e-02 |
1.010e-01 |
X-ray |
|
5.57777e-02 |
1.953e-01 |
X-ray |
|
5.72170e-02 |
2.237e-02 |
X-ray |
|
5.72611e-02 |
4.329e-02 |
X-ray |
|
5.75450e-02 |
1.033e-02 |
X-ray |
|
5.95100e-02 |
5.450e-02 |
Gamma |
|
8.44000e-02 |
9.450e-02 |
Gamma |
|
9.43800e-02 |
1.240e-02 |
Gamma |
|
9.97600e-02 |
2.370e-02 |
Gamma |
|
1.05880e-01 |
3.400e-02 |
Gamma |
|
1.12560e-01 |
3.080e-02 |
Gamma |
|
1.22550e-01 |
1.550e-02 |
Gamma |
|
1.25600e-01 |
1.580e-02 |
Gamma |
|
1.28900e-01 |
2.950e-02 |
Gamma |
|
1.43920e-01 |
3.750e-02 |
Gamma |
|
1.46650e-01 |
4.820e-02 |
Gamma |
|
1.53370e-01 |
3.000e-02 |
Gamma |
|
1.57800e-01 |
1.800e-02 |
Gamma |
|
1.72050e-01 |
5.130e-02 |
Gamma |
|
1.90240e-01 |
3.400e-02 |
Gamma |
|
2.07120e-01 |
2.370e-02 |
Gamma |
|
2.12880e-01 |
3.170e-02 |
Gamma |
|
2.15700e-01 |
1.570e-02 |
Gamma |
|
2.18100e-01 |
1.050e-02 |
Gamma |
|
2.44570e-01 |
1.100e-02 |
Gamma |
|
2.52500e-01 |
1.550e-02 |
Gamma |
|
2.65460e-01 |
1.040e-02 |
Gamma |
|
3.53800e-01 |
1.300e-02 |
Gamma |
|
3.69500e-01 |
1.400e-02 |
Gamma |
|
3.72600e-01 |
1.050e-02 |
Gamma |
|
5.11000e-01 |
2.887e-01 |
Annihilation photon |
|
1.64810e+00 |
1.950e-01 |
Gamma |
|
1.78800e+00 |
1.720e-02 |
Gamma |
|
1.85000e+00 |
1.650e-02 |
Gamma |
|
1.85000e+00 |
1.650e-02 |
Gamma |
|
9.13593e-01 |
2.691e-02 |
Positron |
|
9.35652e-01 |
2.243e-02 |
Positron |
|
9.37644e-01 |
2.243e-02 |
Positron |
|
9.48207e-01 |
1.121e-02 |
Positron |
|
9.56018e-01 |
1.794e-02 |
Positron |
|
1.98170e-05 |
1.139e+00 |
Auger electron |
|
1.41499e-04 |
1.048e+01 |
Auger electron |
|
2.01876e-04 |
3.738e-01 |
Auger electron |
|
2.35201e-04 |
1.801e+00 |
Auger electron |
|
7.51874e-04 |
3.899e-01 |
Auger electron |
|
1.13461e-03 |
3.853e+00 |
Auger electron |
|
1.31132e-03 |
1.918e-01 |
Auger electron |
|
1.50110e-03 |
1.072e-02 |
Auger electron |
|
1.93600e-03 |
6.078e-01 |
Conversion electron |
|
5.49045e-03 |
1.346e+00 |
Auger electron |
|
6.86843e-03 |
4.801e-01 |
Auger electron |
|
8.27944e-03 |
4.329e-02 |
Auger electron |
|
1.42152e-02 |
2.212e-02 |
Conversion electron |
|
1.51426e-02 |
2.901e-02 |
Conversion electron |
|
1.82038e-02 |
5.619e-02 |
Conversion electron |
|
1.86452e-02 |
1.730e-02 |
Conversion electron |
|
1.95726e-02 |
1.637e-02 |
Conversion electron |
|
2.04960e-02 |
1.550e-02 |
Conversion electron |
|
2.16938e-02 |
1.235e-02 |
Conversion electron |
|
2.61238e-02 |
2.051e-02 |
Conversion electron |
|
2.68260e-02 |
3.687e-01 |
Conversion electron |
|
3.58238e-02 |
4.709e-02 |
Conversion electron |
|
3.62652e-02 |
2.193e-02 |
Conversion electron |
|
3.68060e-02 |
1.804e-02 |
Conversion electron |
|
3.71926e-02 |
2.920e-02 |
Conversion electron |
|
3.94671e-02 |
7.209e-02 |
Auger electron |
|
4.37438e-02 |
2.199e-02 |
Conversion electron |
|
4.69039e-02 |
3.648e-02 |
Auger electron |
|
4.83060e-02 |
6.926e-02 |
Conversion electron |
|
4.97938e-02 |
8.163e-02 |
Conversion electron |
|
5.02352e-02 |
1.553e-02 |
Conversion electron |
|
5.11626e-02 |
1.036e-02 |
Conversion electron |
|
5.49860e-02 |
5.372e-02 |
Conversion electron |
|
5.77138e-02 |
2.436e-02 |
Conversion electron |
|
6.49760e-02 |
2.102e-02 |
Conversion electron |
|
6.87952e-02 |
1.975e-02 |
Conversion electron |
|
6.97226e-02 |
2.054e-02 |
Conversion electron |
|
7.46838e-02 |
5.023e-02 |
Conversion electron |
|
7.51252e-02 |
1.151e-02 |
Conversion electron |
|
7.62738e-02 |
1.023e-02 |
Conversion electron |
|
8.26038e-02 |
1.583e-02 |
Conversion electron |
|
8.63460e-02 |
1.558e-02 |
Conversion electron |
|
8.90760e-02 |
3.897e-02 |
Conversion electron |
|
1.14476e-01 |
2.677e-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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