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Radionuclide Dosimetric Data Sheets
Tellurium-129m
Summary data
General
Classification
Isotope: Te-129m
Atomic number (Z): 52
Mass number (A): 129
Neutron number (N): 77
Radioactive decay
Decay modes: β-, Internal transition
Half-life: 33.6 [d]
Decay constant: 2.3877e-07 [1/s]
Daughters: Te-129 (63.0%), I-129 (37.0%)
Radioactive daughters: Te-129, I-129
Dosimetric constants
Mean alpha energy: 0.0 [MeV]
Mean electron energy: 0.27088 [MeV]
Mean photon energy: 0.03757 [MeV]
Air kerma rate constant, Γ10: 2.968e-18 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 2.968e-18 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 4.340e-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-:
4.340e-14 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 6.019e-15
[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/Te-129m 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/Te-129m 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/Te-129m 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/Te-129m Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
1.36119e-05 |
7.728e+00 |
X-ray |
|
1.52508e-05 |
2.023e-02 |
X-ray |
|
3.75695e-03 |
2.123e-02 |
X-ray |
|
2.71868e-02 |
7.894e-02 |
X-ray |
|
2.74652e-02 |
1.469e-01 |
X-ray |
|
3.09378e-02 |
1.353e-02 |
X-ray |
|
3.09901e-02 |
2.624e-02 |
X-ray |
|
6.95880e-01 |
3.071e-02 |
Gamma |
|
3.22731e-01 |
3.102e-02 |
Beta |
|
6.07149e-01 |
3.293e-01 |
Beta |
|
2.29207e-05 |
3.776e+00 |
Auger electron |
|
2.48672e-05 |
1.269e+00 |
Auger electron |
|
1.19996e-04 |
4.407e-01 |
Auger electron |
|
3.11012e-04 |
8.233e-02 |
Auger electron |
|
4.49791e-04 |
9.645e-01 |
Auger electron |
|
5.42198e-04 |
3.727e-02 |
Auger electron |
|
3.07809e-03 |
3.748e-01 |
Auger electron |
|
3.67246e-03 |
1.061e-01 |
Auger electron |
|
2.26653e-02 |
2.551e-02 |
Auger electron |
|
2.65056e-02 |
1.124e-02 |
Auger electron |
|
7.36950e-02 |
3.127e-01 |
Conversion electron |
|
1.00586e-01 |
9.433e-02 |
Conversion electron |
|
1.00882e-01 |
2.181e-02 |
Conversion electron |
|
1.01160e-01 |
1.291e-01 |
Conversion electron |
|
1.04685e-01 |
5.744e-02 |
Conversion electron |
|
1.05500e-01 |
1.315e-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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