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Radionuclide Dosimetric Data Sheets
Terbium-155
Summary data
General
Classification
Isotope: Tb-155
Atomic number (Z): 65
Mass number (A): 155
Neutron number (N): 90
Radioactive decay
Decay modes: Electron capture
Half-life: 5.32 [d]
Decay constant: 1.5080e-06 [1/s]
Daughters: Gd-155 (100.0%)
Radioactive daughters: None
Dosimetric constants
Mean alpha energy: 0.0 [MeV]
Mean electron energy: 0.0434 [MeV]
Mean photon energy: 0.17769 [MeV]
Air kerma rate constant, Γ10: 7.576e-18 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 7.576e-18 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 6.953e-15 [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-:
6.953e-15 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 2.847e-14
[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-155 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-155 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-155 Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
1.94303e-05 |
1.579e+01 |
X-ray |
|
1.09505e-03 |
2.402e-02 |
X-ray |
|
6.01111e-03 |
1.225e-02 |
X-ray |
|
6.04290e-03 |
1.083e-01 |
X-ray |
|
6.71540e-03 |
7.297e-02 |
X-ray |
|
7.08639e-03 |
1.842e-02 |
X-ray |
|
7.78484e-03 |
1.281e-02 |
X-ray |
|
4.23559e-02 |
3.144e-01 |
X-ray |
|
4.30603e-02 |
5.652e-01 |
X-ray |
|
4.52990e-02 |
1.604e-02 |
Gamma |
|
4.86161e-02 |
5.744e-02 |
X-ray |
|
4.87612e-02 |
1.111e-01 |
X-ray |
|
4.99916e-02 |
1.262e-02 |
X-ray |
|
5.00239e-02 |
2.450e-02 |
X-ray |
|
6.00120e-02 |
1.109e-02 |
Gamma |
|
8.65500e-02 |
3.203e-01 |
Gamma |
|
1.05318e-01 |
2.510e-01 |
Gamma |
|
1.48640e-01 |
2.648e-02 |
Gamma |
|
1.61290e-01 |
2.756e-02 |
Gamma |
|
1.63280e-01 |
4.440e-02 |
Gamma |
|
1.80080e-01 |
7.455e-02 |
Gamma |
|
2.62270e-01 |
5.286e-02 |
Gamma |
|
3.40670e-01 |
1.182e-02 |
Gamma |
|
3.67360e-01 |
1.481e-02 |
Gamma |
|
1.68638e-05 |
1.063e+00 |
Auger electron |
|
1.13377e-04 |
7.106e+00 |
Auger electron |
|
1.23738e-04 |
5.855e-01 |
Auger electron |
|
1.82712e-04 |
1.116e+00 |
Auger electron |
|
5.73006e-04 |
2.305e-01 |
Auger electron |
|
8.98228e-04 |
2.387e+00 |
Auger electron |
|
1.07638e-03 |
1.621e-01 |
Auger electron |
|
2.14020e-03 |
2.725e-02 |
Conversion electron |
|
4.77899e-03 |
8.743e-01 |
Auger electron |
|
5.93560e-03 |
3.067e-01 |
Auger electron |
|
7.12716e-03 |
2.666e-02 |
Auger electron |
|
9.70900e-03 |
8.324e-02 |
Conversion electron |
|
1.04192e-02 |
1.937e-02 |
Conversion electron |
|
1.08220e-02 |
6.438e-02 |
Conversion electron |
|
1.15263e-02 |
8.742e-02 |
Conversion electron |
|
1.30520e-02 |
1.383e-02 |
Conversion electron |
|
1.37563e-02 |
1.899e-02 |
Conversion electron |
|
1.72272e-02 |
3.952e-02 |
Conversion electron |
|
1.87690e-02 |
1.042e-02 |
Conversion electron |
|
3.47387e-02 |
4.904e-02 |
Auger electron |
|
3.62470e-02 |
1.155e-01 |
Conversion electron |
|
4.11460e-02 |
2.428e-02 |
Auger electron |
|
5.16622e-02 |
1.095e-02 |
Conversion electron |
|
5.50150e-02 |
5.352e-02 |
Conversion electron |
|
7.82002e-02 |
1.168e-02 |
Conversion electron |
|
9.83370e-02 |
1.495e-02 |
Conversion electron |
|
1.10987e-01 |
1.208e-02 |
Conversion electron |
|
1.12977e-01 |
1.934e-02 |
Conversion electron |
|
1.29777e-01 |
2.447e-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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