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Radionuclide Dosimetric Data Sheets
Tellurium-131m
Summary data
General
Classification
Isotope: Te-131m
Atomic number (Z): 52
Mass number (A): 131
Neutron number (N): 79
Radioactive decay
Decay modes: β-, Internal transition
Half-life: 30.0 [h]
Decay constant: 6.4180e-06 [1/s]
Daughters: I-131 (77.8%), Te-131 (22.2%)
Radioactive daughters: I-131, Te-131
Dosimetric constants
Mean alpha energy: 0.0 [MeV]
Mean electron energy: 0.18701 [MeV]
Mean photon energy: 1.45447 [MeV]
Air kerma rate constant, Γ10: 5.329e-17 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 5.329e-17 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 2.996e-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-:
2.996e-14 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 2.330e-13
[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-131m 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-131m 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-131m 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-131m Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
1.36110e-05 |
2.688e+00 |
X-ray |
|
1.52661e-05 |
2.064e+00 |
X-ray |
|
2.71868e-02 |
3.617e-02 |
X-ray |
|
2.74652e-02 |
6.734e-02 |
X-ray |
|
2.83065e-02 |
3.599e-02 |
X-ray |
|
2.86096e-02 |
6.681e-02 |
X-ray |
|
3.09901e-02 |
1.202e-02 |
X-ray |
|
3.22942e-02 |
1.205e-02 |
X-ray |
|
8.11400e-02 |
4.144e-02 |
Gamma |
|
1.02060e-01 |
8.091e-02 |
Gamma |
|
1.49710e-01 |
5.170e-02 |
Gamma |
|
2.00630e-01 |
7.696e-02 |
Gamma |
|
2.40930e-01 |
7.736e-02 |
Gamma |
|
2.78560e-01 |
1.816e-02 |
Gamma |
|
3.34270e-01 |
9.749e-02 |
Gamma |
|
3.64980e-01 |
1.224e-02 |
Gamma |
|
4.52300e-01 |
1.579e-02 |
Gamma |
|
4.62920e-01 |
1.855e-02 |
Gamma |
|
5.86300e-01 |
2.013e-02 |
Gamma |
|
6.65050e-01 |
4.420e-02 |
Gamma |
|
7.13100e-01 |
1.460e-02 |
Gamma |
|
7.44200e-01 |
1.618e-02 |
Gamma |
|
7.73670e-01 |
3.892e-01 |
Gamma |
|
7.82490e-01 |
7.933e-02 |
Gamma |
|
7.93750e-01 |
1.413e-01 |
Gamma |
|
8.22780e-01 |
6.236e-02 |
Gamma |
|
8.52210e-01 |
2.104e-01 |
Gamma |
|
9.10000e-01 |
3.355e-02 |
Gamma |
|
9.20620e-01 |
1.224e-02 |
Gamma |
|
1.05969e+00 |
1.579e-02 |
Gamma |
|
1.12546e+00 |
1.164e-01 |
Gamma |
|
1.14889e+00 |
1.539e-02 |
Gamma |
|
1.20660e+00 |
9.946e-02 |
Gamma |
|
1.64601e+00 |
1.263e-02 |
Gamma |
|
1.88770e+00 |
1.381e-02 |
Gamma |
|
2.00094e+00 |
2.052e-02 |
Gamma |
|
6.90635e-02 |
1.016e-02 |
Beta |
|
8.61053e-02 |
1.706e-02 |
Beta |
|
1.20107e-01 |
2.318e-02 |
Beta |
|
1.23514e-01 |
5.583e-02 |
Beta |
|
1.30617e-01 |
3.745e-01 |
Beta |
|
1.50034e-01 |
2.202e-02 |
Beta |
|
1.59059e-01 |
1.683e-01 |
Beta |
|
1.63168e-01 |
1.450e-02 |
Beta |
|
2.53575e-01 |
2.636e-02 |
Beta |
|
9.62583e-01 |
2.947e-02 |
Beta |
|
2.29245e-05 |
1.313e+00 |
Auger electron |
|
2.49070e-05 |
4.402e-01 |
Auger electron |
|
2.70063e-05 |
3.090e-01 |
Auger electron |
|
2.89490e-05 |
9.946e-01 |
Auger electron |
|
1.20656e-04 |
1.523e-01 |
Auger electron |
|
1.25065e-04 |
1.139e-01 |
Auger electron |
|
3.02677e-04 |
2.915e-02 |
Auger electron |
|
3.04147e-04 |
2.149e-02 |
Auger electron |
|
4.49697e-04 |
3.363e-01 |
Auger electron |
|
4.76897e-04 |
2.654e-01 |
Auger electron |
|
5.41804e-04 |
1.298e-02 |
Auger electron |
|
5.78278e-04 |
1.263e-02 |
Auger electron |
|
3.08468e-03 |
1.315e-01 |
Auger electron |
|
3.20416e-03 |
1.041e-01 |
Auger electron |
|
3.67914e-03 |
3.724e-02 |
Auger electron |
|
3.83871e-03 |
3.077e-02 |
Auger electron |
|
2.26653e-02 |
1.169e-02 |
Auger electron |
|
2.35598e-02 |
1.080e-02 |
Auger electron |
|
4.79760e-02 |
4.954e-02 |
Conversion electron |
|
6.88960e-02 |
5.009e-02 |
Conversion electron |
|
1.16546e-01 |
1.092e-02 |
Conversion electron |
|
1.50445e-01 |
1.433e-01 |
Conversion electron |
|
1.77336e-01 |
2.891e-02 |
Conversion electron |
|
1.77910e-01 |
1.988e-02 |
Conversion electron |
|
1.81435e-01 |
1.232e-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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