<= Return to MIRDspec isotope database
Radionuclide Dosimetric Data Sheets
Tellurium-123m
Summary data
General
Classification
Isotope: Te-123m
Atomic number (Z): 52
Mass number (A): 123
Neutron number (N): 71
Radioactive decay
Decay modes: Internal transition
Half-life: 119.2 [d]
Decay constant: 6.7275e-08 [1/s]
Daughters: Te-123 (100.0%)
Radioactive daughters: Te-123
Dosimetric constants
Mean alpha energy: 0.0 [MeV]
Mean electron energy: 0.09899 [MeV]
Mean photon energy: 0.14772 [MeV]
Air kerma rate constant, Γ10: 7.599e-18 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 7.599e-18 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 1.586e-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-:
1.586e-14 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 2.367e-14
[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-123m 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-123m 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-123m Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
1.36122e-05 |
1.409e+01 |
X-ray |
|
3.75695e-03 |
3.929e-02 |
X-ray |
|
4.02446e-03 |
1.605e-02 |
X-ray |
|
2.71868e-02 |
1.393e-01 |
X-ray |
|
2.74652e-02 |
2.593e-01 |
X-ray |
|
3.09378e-02 |
2.388e-02 |
X-ray |
|
3.09901e-02 |
4.631e-02 |
X-ray |
|
1.58960e-01 |
8.401e-01 |
Gamma |
|
2.29185e-05 |
6.883e+00 |
Auger electron |
|
2.48588e-05 |
2.312e+00 |
Auger electron |
|
1.19876e-04 |
8.029e-01 |
Auger electron |
|
3.11758e-04 |
1.461e-01 |
Auger electron |
|
4.49739e-04 |
1.760e+00 |
Auger electron |
|
5.42077e-04 |
6.801e-02 |
Auger electron |
|
3.07515e-03 |
6.832e-01 |
Auger electron |
|
3.66931e-03 |
1.933e-01 |
Auger electron |
|
4.28602e-03 |
1.367e-02 |
Auger electron |
|
2.26653e-02 |
4.502e-02 |
Auger electron |
|
2.65056e-02 |
1.983e-02 |
Auger electron |
|
5.66550e-02 |
4.140e-01 |
Conversion electron |
|
8.35458e-02 |
1.524e-01 |
Conversion electron |
|
8.38418e-02 |
3.474e-02 |
Conversion electron |
|
8.41203e-02 |
2.587e-01 |
Conversion electron |
|
8.76452e-02 |
1.066e-01 |
Conversion electron |
|
8.84600e-02 |
2.430e-02 |
Conversion electron |
|
1.27155e-01 |
1.378e-01 |
Conversion electron |
|
1.54046e-01 |
1.648e-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)
<= Return to MIRDspec isotope database
