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Radionuclide Dosimetric Data Sheets
Terbium-157
Summary data
General
Classification
Isotope: Tb-157
Atomic number (Z): 65
Mass number (A): 157
Neutron number (N): 92
Radioactive decay
Decay modes: Electron capture
Half-life: 71.0 [y]
Decay constant: 3.0937e-10 [1/s]
Daughters: Gd-157 (100.0%)
Radioactive daughters: None
Dosimetric constants
Mean alpha energy: 0.0 [MeV]
Mean electron energy: 0.00573 [MeV]
Mean photon energy: 0.00565 [MeV]
Air kerma rate constant, Γ10: 3.179e-19 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 3.179e-19 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 9.180e-16 [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-:
9.180e-16 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 9.052e-16
[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/Tb-157 Summary 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-157 Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
1.94941e-05 |
9.650e+00 |
X-ray |
|
1.10719e-03 |
1.280e-02 |
X-ray |
|
6.04290e-03 |
3.543e-02 |
X-ray |
|
6.66291e-03 |
1.498e-02 |
X-ray |
|
6.71540e-03 |
2.776e-02 |
X-ray |
|
6.80799e-03 |
2.137e-02 |
X-ray |
|
4.23559e-02 |
2.982e-02 |
X-ray |
|
4.30603e-02 |
5.362e-02 |
X-ray |
|
4.87612e-02 |
1.054e-02 |
X-ray |
|
1.68638e-05 |
6.819e-01 |
Auger electron |
|
1.12893e-04 |
4.377e+00 |
Auger electron |
|
1.32216e-04 |
3.668e-01 |
Auger electron |
|
1.84163e-04 |
8.268e-01 |
Auger electron |
|
6.11362e-04 |
3.781e-01 |
Auger electron |
|
9.07973e-04 |
1.255e+00 |
Auger electron |
|
1.10005e-03 |
8.783e-02 |
Auger electron |
|
4.98389e-03 |
4.421e-01 |
Auger electron |
|
6.16354e-03 |
1.569e-01 |
Auger electron |
|
7.38996e-03 |
1.390e-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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