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Radionuclide Dosimetric Data Sheets
Terbium-146
Summary data
General
Classification
Isotope: Tb-146
Atomic number (Z): 65
Mass number (A): 146
Neutron number (N): 81
Radioactive decay
Decay modes: β+, Electron capture
Half-life: 23.0 [s]
Decay constant: 3.0137e-02 [1/s]
Daughters: Gd-146 (100.0%)
Radioactive daughters: Gd-146
Dosimetric constants
Mean alpha energy: 0.0 [MeV]
Mean electron energy: 1.46436 [MeV]
Mean photon energy: 3.62561 [MeV]
Air kerma rate constant, Γ10: 9.320e-17 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 1.214e-16 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 2.346e-13 [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-:
2.346e-13 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 5.809e-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/Tb-146 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-146 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-146 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-146 Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
1.94294e-05 |
2.521e+00 |
X-ray |
|
6.04290e-03 |
1.770e-02 |
X-ray |
|
6.71540e-03 |
1.141e-02 |
X-ray |
|
4.23559e-02 |
6.317e-02 |
X-ray |
|
4.30603e-02 |
1.136e-01 |
X-ray |
|
4.86161e-02 |
1.154e-02 |
X-ray |
|
4.87612e-02 |
2.232e-02 |
X-ray |
|
4.41000e-01 |
1.310e-01 |
Gamma |
|
5.11000e-01 |
1.459e+00 |
Annihilation photon |
|
6.55000e-01 |
2.600e-02 |
Gamma |
|
9.87600e-01 |
1.000e-02 |
Gamma |
|
1.03190e+00 |
2.900e-02 |
Gamma |
|
1.07890e+00 |
5.160e-01 |
Gamma |
|
1.41710e+00 |
1.720e-01 |
Gamma |
|
1.57950e+00 |
1.000e+00 |
Gamma |
|
3.13960e+00 |
1.170e-01 |
Gamma |
|
1.14105e+00 |
5.435e-02 |
Positron |
|
1.89063e+00 |
1.467e-01 |
Positron |
|
1.93882e+00 |
1.250e-01 |
Positron |
|
2.09779e+00 |
3.315e-01 |
Positron |
|
2.56492e+00 |
6.739e-02 |
Positron |
|
1.68638e-05 |
1.694e-01 |
Auger electron |
|
1.13380e-04 |
1.134e+00 |
Auger electron |
|
1.23653e-04 |
9.325e-02 |
Auger electron |
|
1.82280e-04 |
1.771e-01 |
Auger electron |
|
5.72552e-04 |
3.571e-02 |
Auger electron |
|
8.97941e-04 |
3.821e-01 |
Auger electron |
|
1.07580e-03 |
2.594e-02 |
Auger electron |
|
4.77165e-03 |
1.405e-01 |
Auger electron |
|
5.92770e-03 |
4.927e-02 |
Auger 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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