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Radionuclide Dosimetric Data Sheets

Tellurium-123

Isotope:  Te-123
Atomic number (Z):  52
Mass number (A):  123
Neutron number (N):  71

Decay modes:  Electron capture
Half-life:  600000000000000.0 [y]
Decay constant:  3.6608e-23 [1/s]
Daughters:  Sb-123 (100.0%)
Radioactive daughters:  None

Mean alpha energy:  0.0 [MeV]
Mean electron energy:  0.00275 [MeV]
Mean photon energy:  0.00035 [MeV]
Air kerma rate constant, Γ₁₀:  9.319e-21 [Gy·m²/Bq·s]
Air kerma coefficient, K_air:  9.319e-21 [Gy·m²/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or electrons), Δ_wp:  4.406e-16 [Gy·kg/Bq·s]
Equilibrium dose constant for alphas, Δ_α:  0.000e+00 [Gy·kg/Bq·s]
Equilibrium dose constant for betas/electrons, Δ_β-,β+,e-:  4.406e-16 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δ_p:  5.608e-17 [Gy·kg/Bq·s]

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-123 Summary Spectrum.csv

 

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-123 Summary Spectrum.csv

 

Energy [MeV]	Yield [#/nt] if > 0.01	Radiation type
1.22397e-05	1.073e+01	X-ray
3.59265e-03	3.679e-02	X-ray
1.68313e-05	5.287e+00	Auger electron
2.71926e-05	1.763e+00	Auger electron
1.19192e-04	5.886e-01	Auger electron
3.36858e-04	1.585e-02	Auger electron
4.20940e-04	1.390e+00	Auger electron
5.00519e-04	4.181e-02	Auger electron
2.88166e-03	4.981e-01	Auger electron
3.42930e-03	1.334e-01	Auger electron

 

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

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

 

 

 

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