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Radionuclide Dosimetric Data Sheets
Terbium-148m
Summary data
General
Classification
Isotope: Tb-148m
Atomic number (Z): 65
Mass number (A): 148
Neutron number (N): 83
Radioactive decay
Decay modes: β+, Electron capture
Half-life: 2.2 [m]
Decay constant: 5.2511e-03 [1/s]
Daughters: Gd-148 (100.0%)
Radioactive daughters: Gd-148
Dosimetric constants
Mean alpha energy: 0.0 [MeV]
Mean electron energy: 0.31055 [MeV]
Mean photon energy: 3.13898 [MeV]
Air kerma rate constant, Γ10: 1.053e-16 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 1.166e-16 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 4.976e-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-:
4.976e-14 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 5.029e-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-148m 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-148m 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-148m 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-148m Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
1.94294e-05 |
6.948e+00 |
X-ray |
|
1.09476e-03 |
1.059e-02 |
X-ray |
|
6.04290e-03 |
4.874e-02 |
X-ray |
|
6.71540e-03 |
3.158e-02 |
X-ray |
|
4.23559e-02 |
1.728e-01 |
X-ray |
|
4.30603e-02 |
3.106e-01 |
X-ray |
|
4.86161e-02 |
3.157e-02 |
X-ray |
|
4.87612e-02 |
6.105e-02 |
X-ray |
|
5.00239e-02 |
1.346e-02 |
X-ray |
|
1.29500e-01 |
3.100e-02 |
Gamma |
|
1.30800e-01 |
1.070e-02 |
Gamma |
|
1.42700e-01 |
3.200e-02 |
Gamma |
|
3.94550e-01 |
9.650e-01 |
Gamma |
|
4.81650e-01 |
3.800e-02 |
Gamma |
|
4.88830e-01 |
6.200e-02 |
Gamma |
|
5.11000e-01 |
5.825e-01 |
Annihilation photon |
|
6.31870e-01 |
9.370e-01 |
Gamma |
|
7.53000e-01 |
2.100e-02 |
Gamma |
|
7.84480e-01 |
1.000e+00 |
Gamma |
|
8.08100e-01 |
2.900e-02 |
Gamma |
|
8.82410e-01 |
9.000e-01 |
Gamma |
|
8.83600e-01 |
1.110e-02 |
Gamma |
|
1.42590e+00 |
1.150e-02 |
Gamma |
|
9.52207e-01 |
2.685e-01 |
Positron |
|
1.36323e+00 |
1.386e-02 |
Positron |
|
1.68638e-05 |
4.668e-01 |
Auger electron |
|
1.13381e-04 |
3.126e+00 |
Auger electron |
|
1.23635e-04 |
2.570e-01 |
Auger electron |
|
1.82323e-04 |
4.882e-01 |
Auger electron |
|
5.72186e-04 |
9.813e-02 |
Auger electron |
|
8.97945e-04 |
1.053e+00 |
Auger electron |
|
1.07579e-03 |
7.150e-02 |
Auger electron |
|
4.77191e-03 |
3.872e-01 |
Auger electron |
|
5.92795e-03 |
1.358e-01 |
Auger electron |
|
7.11863e-03 |
1.179e-02 |
Auger electron |
|
3.47387e-02 |
2.695e-02 |
Auger electron |
|
4.11460e-02 |
1.334e-02 |
Auger electron |
|
3.44247e-01 |
2.054e-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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