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Radionuclide Dosimetric Data Sheets
Tellurium-125m
Summary data
General
Classification
Isotope: Te-125m
Atomic number (Z): 52
Mass number (A): 125
Neutron number (N): 73
Radioactive decay
Decay modes: Internal transition
Half-life: 57.4 [d]
Decay constant: 1.3977e-07 [1/s]
Daughters: Te-125 (100.0%)
Radioactive daughters: None
Dosimetric constants
Mean alpha energy: 0.0 [MeV]
Mean electron energy: 0.10907 [MeV]
Mean photon energy: 0.03598 [MeV]
Air kerma rate constant, Γ10: 8.140e-18 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 8.140e-18 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 1.747e-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-:
1.747e-14 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 5.765e-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-125m 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-125m Summary 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-125m Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
1.36112e-05 |
2.434e+01 |
X-ray |
|
3.75695e-03 |
6.562e-02 |
X-ray |
|
4.02446e-03 |
3.346e-02 |
X-ray |
|
2.71868e-02 |
3.322e-01 |
X-ray |
|
2.74652e-02 |
6.185e-01 |
X-ray |
|
3.09378e-02 |
5.695e-02 |
X-ray |
|
3.09901e-02 |
1.105e-01 |
X-ray |
|
3.16740e-02 |
1.180e-02 |
X-ray |
|
3.16841e-02 |
2.319e-02 |
X-ray |
|
3.55040e-02 |
6.670e-02 |
Gamma |
|
2.29215e-05 |
1.190e+01 |
Auger electron |
|
2.49015e-05 |
3.981e+00 |
Auger electron |
|
1.20601e-04 |
1.376e+00 |
Auger electron |
|
3.01766e-04 |
2.538e-01 |
Auger electron |
|
4.49577e-04 |
3.054e+00 |
Auger electron |
|
5.41487e-04 |
1.178e-01 |
Auger electron |
|
3.08113e-03 |
1.194e+00 |
Auger electron |
|
3.67527e-03 |
3.380e-01 |
Auger electron |
|
3.69900e-03 |
8.060e-01 |
Conversion electron |
|
4.29176e-03 |
2.391e-02 |
Auger electron |
|
2.26653e-02 |
1.074e-01 |
Auger electron |
|
2.65056e-02 |
4.730e-02 |
Auger electron |
|
3.05898e-02 |
9.662e-02 |
Conversion electron |
|
3.46892e-02 |
2.199e-02 |
Conversion electron |
|
7.74710e-02 |
5.101e-01 |
Conversion electron |
|
1.04362e-01 |
1.488e-01 |
Conversion electron |
|
1.04658e-01 |
3.443e-02 |
Conversion electron |
|
1.04936e-01 |
1.950e-01 |
Conversion electron |
|
1.08461e-01 |
8.822e-02 |
Conversion electron |
|
1.09276e-01 |
2.022e-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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