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Radionuclide Dosimetric Data Sheets
Terbium-165
Summary data
General
Classification
Isotope: Tb-165
Atomic number (Z): 65
Mass number (A): 165
Neutron number (N): 100
Radioactive decay
Decay modes: β-
Half-life: 2.11 [m]
Decay constant: 5.4751e-03 [1/s]
Daughters: Dy-165m (89.0%), Dy-165 (11.0%)
Radioactive daughters: Dy-165m, Dy-165
Dosimetric constants
Mean alpha energy: 0.0 [MeV]
Mean electron energy: 0.89664 [MeV]
Mean photon energy: 0.83631 [MeV]
Air kerma rate constant, Γ10: 2.838e-17 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 2.838e-17 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 1.437e-13 [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-:
1.437e-13 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 1.340e-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-165 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-165 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-165 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-165 Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
1.37357e-05 |
3.825e+00 |
X-ray |
|
6.48150e-03 |
2.484e-02 |
X-ray |
|
7.25410e-03 |
2.290e-02 |
X-ray |
|
5.03700e-02 |
5.632e-02 |
Gamma |
|
1.84080e-01 |
6.080e-02 |
Gamma |
|
4.65400e-01 |
3.136e-02 |
Gamma |
|
5.09200e-01 |
1.600e-02 |
Gamma |
|
5.35500e-01 |
2.304e-02 |
Gamma |
|
5.38850e-01 |
7.232e-02 |
Gamma |
|
8.26200e-01 |
3.648e-02 |
Gamma |
|
1.03885e+00 |
1.024e-02 |
Gamma |
|
1.17853e+00 |
1.325e-01 |
Gamma |
|
1.21920e+00 |
2.560e-02 |
Gamma |
|
1.22895e+00 |
1.216e-02 |
Gamma |
|
1.23490e+00 |
1.472e-02 |
Gamma |
|
1.24165e+00 |
3.072e-02 |
Gamma |
|
1.28765e+00 |
3.200e-02 |
Gamma |
|
1.29205e+00 |
7.040e-02 |
Gamma |
|
1.39183e+00 |
4.416e-02 |
Gamma |
|
1.39645e+00 |
1.408e-02 |
Gamma |
|
1.43970e+00 |
1.664e-02 |
Gamma |
|
1.59060e+00 |
1.024e-02 |
Gamma |
|
1.61465e+00 |
2.688e-02 |
Gamma |
|
1.63274e+00 |
1.728e-02 |
Gamma |
|
1.66480e+00 |
6.400e-02 |
Gamma |
|
3.96763e-01 |
1.619e-02 |
Beta |
|
4.13332e-01 |
1.010e-01 |
Beta |
|
5.69437e-01 |
1.552e-01 |
Beta |
|
5.96432e-01 |
1.371e-01 |
Beta |
|
9.47107e-01 |
5.714e-02 |
Beta |
|
1.10651e+00 |
5.714e-02 |
Beta |
|
1.11799e+00 |
2.857e-01 |
Beta |
|
1.14080e+00 |
1.905e-01 |
Beta |
|
1.81686e-05 |
2.147e-01 |
Auger electron |
|
1.28360e-04 |
1.751e+00 |
Auger electron |
|
1.57707e-04 |
8.778e-02 |
Auger electron |
|
2.12819e-04 |
2.964e-01 |
Auger electron |
|
6.68983e-04 |
8.046e-02 |
Auger electron |
|
1.01999e-03 |
5.866e-01 |
Auger electron |
|
1.19987e-03 |
3.217e-02 |
Auger electron |
|
5.20372e-03 |
2.057e-01 |
Auger electron |
|
6.47348e-03 |
7.269e-02 |
Auger electron |
|
4.13575e-02 |
1.032e-01 |
Conversion electron |
|
4.17793e-02 |
1.179e-01 |
Conversion electron |
|
4.25890e-02 |
1.299e-01 |
Conversion electron |
|
4.87079e-02 |
8.211e-02 |
Conversion electron |
|
5.03700e-02 |
2.192e-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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