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Radionuclide Dosimetric Data Sheets
Tellurium-131
Summary data
General
Classification
Isotope: Te-131
Atomic number (Z): 52
Mass number (A): 131
Neutron number (N): 79
Radioactive decay
Decay modes: β-
Half-life: 25.0 [m]
Decay constant: 4.6210e-04 [1/s]
Daughters: I-131 (100.0%)
Radioactive daughters: I-131
Dosimetric constants
Mean alpha energy: 0.0 [MeV]
Mean electron energy: 0.71218 [MeV]
Mean photon energy: 0.41998 [MeV]
Air kerma rate constant, Γ10: 1.553e-17 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 1.553e-17 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 1.141e-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-:
1.141e-13 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 6.729e-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-131 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-131 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-131 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-131 Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
1.52659e-05 |
2.137e+00 |
X-ray |
|
2.83065e-02 |
3.805e-02 |
X-ray |
|
2.86096e-02 |
7.064e-02 |
X-ray |
|
3.22942e-02 |
1.274e-02 |
X-ray |
|
1.49716e-01 |
6.880e-01 |
Gamma |
|
4.52323e-01 |
1.820e-01 |
Gamma |
|
4.92660e-01 |
4.830e-02 |
Gamma |
|
6.02039e-01 |
4.190e-02 |
Gamma |
|
6.54260e-01 |
1.527e-02 |
Gamma |
|
9.48542e-01 |
2.257e-02 |
Gamma |
|
9.97250e-01 |
3.337e-02 |
Gamma |
|
1.14696e+00 |
4.954e-02 |
Gamma |
|
2.39336e-01 |
1.196e-02 |
Beta |
|
2.61239e-01 |
1.175e-02 |
Beta |
|
2.67843e-01 |
1.339e-02 |
Beta |
|
3.80998e-01 |
9.953e-02 |
Beta |
|
4.01255e-01 |
2.578e-02 |
Beta |
|
4.95180e-01 |
1.174e-02 |
Beta |
|
6.14830e-01 |
2.168e-01 |
Beta |
|
8.17185e-01 |
5.926e-01 |
Beta |
|
2.70142e-05 |
3.203e-01 |
Auger electron |
|
2.89503e-05 |
1.030e+00 |
Auger electron |
|
1.25025e-04 |
1.180e-01 |
Auger electron |
|
3.06028e-04 |
2.264e-02 |
Auger electron |
|
4.76938e-04 |
2.746e-01 |
Auger electron |
|
5.78411e-04 |
1.307e-02 |
Auger electron |
|
3.20474e-03 |
1.078e-01 |
Auger electron |
|
3.83941e-03 |
3.185e-02 |
Auger electron |
|
2.35598e-02 |
1.142e-02 |
Auger electron |
|
1.16552e-01 |
1.452e-01 |
Conversion electron |
|
1.44554e-01 |
1.757e-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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