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Radionuclide Dosimetric Data Sheets
Terbium-161
Summary data
General
Classification
Isotope: Tb-161
Atomic number (Z): 65
Mass number (A): 161
Neutron number (N): 96
Radioactive decay
Decay modes: β-
Half-life: 6.906 [d]
Decay constant: 1.1617e-06 [1/s]
Daughters: Dy-161 (100.0%)
Radioactive daughters: None
Dosimetric constants
Mean alpha energy: 0.0 [MeV]
Mean electron energy: 0.20248 [MeV]
Mean photon energy: 0.03652 [MeV]
Air kerma rate constant, Γ10: 3.298e-18 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 3.298e-18 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 3.244e-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-:
3.244e-14 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 5.851e-15
[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/Tb-161 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/Tb-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/Tb-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/Tb-161 Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
1.37706e-05 |
1.247e+01 |
X-ray |
|
1.23425e-03 |
2.219e-02 |
X-ray |
|
6.48150e-03 |
7.377e-02 |
X-ray |
|
7.18161e-03 |
1.512e-02 |
X-ray |
|
7.25410e-03 |
5.826e-02 |
X-ray |
|
7.35039e-03 |
2.107e-02 |
X-ray |
|
7.62076e-03 |
1.249e-02 |
X-ray |
|
8.42364e-03 |
1.022e-02 |
X-ray |
|
2.56514e-02 |
2.315e-01 |
Gamma |
|
4.52703e-02 |
6.578e-02 |
X-ray |
|
4.60801e-02 |
1.175e-01 |
X-ray |
|
4.89153e-02 |
1.703e-01 |
Gamma |
|
5.20302e-02 |
1.210e-02 |
X-ray |
|
5.21989e-02 |
2.339e-02 |
X-ray |
|
5.71917e-02 |
1.785e-02 |
Gamma |
|
7.45667e-02 |
1.020e-01 |
Gamma |
|
1.37651e-01 |
2.547e-01 |
Beta |
|
1.57324e-01 |
6.443e-01 |
Beta |
|
1.74509e-01 |
4.956e-02 |
Beta |
|
1.83646e-01 |
4.956e-02 |
Beta |
|
1.81686e-05 |
7.158e-01 |
Auger electron |
|
1.28230e-04 |
5.716e+00 |
Auger electron |
|
1.61806e-04 |
2.889e-01 |
Auger electron |
|
2.12183e-04 |
9.995e-01 |
Auger electron |
|
6.84692e-04 |
3.788e-01 |
Auger electron |
|
1.02155e-03 |
1.836e+00 |
Auger electron |
|
1.20494e-03 |
1.013e-01 |
Auger electron |
|
3.33070e-03 |
1.825e-01 |
Conversion electron |
|
5.25045e-03 |
6.516e-01 |
Auger electron |
|
6.52770e-03 |
2.309e-01 |
Auger electron |
|
7.84506e-03 |
2.061e-02 |
Auger electron |
|
1.66389e-02 |
1.513e-01 |
Conversion electron |
|
1.70607e-02 |
1.093e-01 |
Conversion electron |
|
1.78704e-02 |
1.594e-01 |
Conversion electron |
|
2.07057e-02 |
5.679e-02 |
Conversion electron |
|
2.39893e-02 |
9.400e-02 |
Conversion electron |
|
2.56514e-02 |
2.431e-02 |
Conversion electron |
|
3.99028e-02 |
3.805e-01 |
Conversion electron |
|
4.03246e-02 |
4.234e-02 |
Conversion electron |
|
4.11343e-02 |
1.623e-02 |
Conversion electron |
|
4.72532e-02 |
9.695e-02 |
Conversion electron |
|
4.81792e-02 |
2.467e-02 |
Conversion electron |
|
4.89153e-02 |
2.719e-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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