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Radionuclide Dosimetric Data Sheets
Terbium-149
Summary data
General
Classification
Isotope: Tb-149
Atomic number (Z): 65
Mass number (A): 149
Neutron number (N): 84
Radioactive decay
Decay modes: α, β+, Electron capture
Half-life: 4.118 [h]
Decay constant: 4.6756e-05 [1/s]
Daughters: Gd-149 (83.3%), Eu-145 (16.7%)
Radioactive daughters: Gd-149, Eu-145
Dosimetric constants
Mean alpha energy: 0.681 [MeV]
Mean electron energy: 0.08706 [MeV]
Mean photon energy: 1.36116 [MeV]
Air kerma rate constant, Γ10: 4.532e-17 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 4.808e-17 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 1.231e-13 [Gy·kg/Bq·s]
Equilibrium dose constant for alphas, Δα: 1.091e-13
[Gy·kg/Bq·s]
Equilibrium dose constant for betas/electrons, Δβ-,β+,e-:
1.395e-14 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 2.181e-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-149 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-149 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-149 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-149 Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
1.94296e-05 |
8.357e+00 |
X-ray |
|
1.09478e-03 |
1.274e-02 |
X-ray |
|
6.04290e-03 |
5.846e-02 |
X-ray |
|
6.71540e-03 |
3.812e-02 |
X-ray |
|
4.23559e-02 |
2.055e-01 |
X-ray |
|
4.30603e-02 |
3.694e-01 |
X-ray |
|
4.86161e-02 |
3.754e-02 |
X-ray |
|
4.87612e-02 |
7.261e-02 |
X-ray |
|
5.00239e-02 |
1.601e-02 |
X-ray |
|
1.64980e-01 |
2.636e-01 |
Gamma |
|
1.87220e-01 |
4.300e-02 |
Gamma |
|
3.52240e-01 |
2.943e-01 |
Gamma |
|
3.88570e-01 |
1.837e-01 |
Gamma |
|
4.64850e-01 |
5.651e-02 |
Gamma |
|
5.11000e-01 |
1.430e-01 |
Annihilation photon |
|
6.52120e-01 |
1.625e-01 |
Gamma |
|
7.72650e-01 |
1.607e-02 |
Gamma |
|
8.17100e-01 |
1.159e-01 |
Gamma |
|
8.53430e-01 |
1.545e-01 |
Gamma |
|
8.61860e-01 |
7.497e-02 |
Gamma |
|
1.04065e+00 |
1.457e-02 |
Gamma |
|
1.13530e+00 |
1.183e-02 |
Gamma |
|
1.17540e+00 |
3.267e-02 |
Gamma |
|
1.34119e+00 |
2.296e-02 |
Gamma |
|
1.64026e+00 |
3.179e-02 |
Gamma |
|
1.82750e+00 |
1.095e-02 |
Gamma |
|
6.38896e-01 |
3.912e-02 |
Positron |
|
8.12250e-01 |
1.008e-02 |
Positron |
|
1.68638e-05 |
5.617e-01 |
Auger electron |
|
1.13381e-04 |
3.760e+00 |
Auger electron |
|
1.23641e-04 |
3.093e-01 |
Auger electron |
|
1.82378e-04 |
5.875e-01 |
Auger electron |
|
5.72160e-04 |
1.184e-01 |
Auger electron |
|
8.97974e-04 |
1.266e+00 |
Auger electron |
|
1.07585e-03 |
8.599e-02 |
Auger electron |
|
4.77284e-03 |
4.654e-01 |
Auger electron |
|
5.92894e-03 |
1.632e-01 |
Auger electron |
|
7.11973e-03 |
1.418e-02 |
Auger electron |
|
3.47387e-02 |
3.205e-02 |
Auger electron |
|
4.11460e-02 |
1.587e-02 |
Auger electron |
|
1.14677e-01 |
9.376e-02 |
Conversion electron |
|
1.36917e-01 |
1.191e-02 |
Conversion electron |
|
1.56630e-01 |
1.133e-02 |
Conversion electron |
|
3.96845e+00 |
1.669e-01 |
Alpha |
|
1.09546e-01 |
1.669e-01 |
Alpha recoil |
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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