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Radionuclide Dosimetric Data Sheets
Terbium-147m
Summary data
General
Classification
Isotope: Tb-147m
Atomic number (Z): 65
Mass number (A): 147
Neutron number (N): 82
Radioactive decay
Decay modes: β+, Electron capture
Half-life: 1.87 [m]
Decay constant: 6.1778e-03 [1/s]
Daughters: Gd-147 (100.0%)
Radioactive daughters: Gd-147
Dosimetric constants
Mean alpha energy: 0.0 [MeV]
Mean electron energy: 0.31957 [MeV]
Mean photon energy: 1.91163 [MeV]
Air kerma rate constant, Γ10: 5.222e-17 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 6.438e-17 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 5.120e-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-:
5.120e-14 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 3.063e-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-147m 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-147m 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-147m 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-147m Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
1.94296e-05 |
6.199e+00 |
X-ray |
|
6.04290e-03 |
4.348e-02 |
X-ray |
|
6.71540e-03 |
2.802e-02 |
X-ray |
|
4.23559e-02 |
1.550e-01 |
X-ray |
|
4.30603e-02 |
2.787e-01 |
X-ray |
|
4.86161e-02 |
2.833e-02 |
X-ray |
|
4.87612e-02 |
5.479e-02 |
X-ray |
|
5.00239e-02 |
1.208e-02 |
X-ray |
|
5.11000e-01 |
6.281e-01 |
Annihilation photon |
|
9.97200e-01 |
1.178e-02 |
Gamma |
|
1.39730e+00 |
7.850e-01 |
Gamma |
|
1.64280e+00 |
1.178e-02 |
Gamma |
|
1.79830e+00 |
1.429e-01 |
Gamma |
|
8.31259e-01 |
3.230e-02 |
Positron |
|
1.01215e+00 |
2.744e-01 |
Positron |
|
1.68638e-05 |
4.166e-01 |
Auger electron |
|
1.13378e-04 |
2.789e+00 |
Auger electron |
|
1.23678e-04 |
2.293e-01 |
Auger electron |
|
1.82282e-04 |
4.359e-01 |
Auger electron |
|
5.72866e-04 |
8.825e-02 |
Auger electron |
|
8.97963e-04 |
9.392e-01 |
Auger electron |
|
1.07586e-03 |
6.377e-02 |
Auger electron |
|
4.77209e-03 |
3.453e-01 |
Auger electron |
|
5.92820e-03 |
1.211e-01 |
Auger electron |
|
7.11901e-03 |
1.052e-02 |
Auger electron |
|
3.47387e-02 |
2.418e-02 |
Auger electron |
|
4.11460e-02 |
1.197e-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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