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Radionuclide Dosimetric Data Sheets

Tellurium-127m

Isotope:  Te-127m
Atomic number (Z):  52
Mass number (A):  127
Neutron number (N):  75

Decay modes:  β-, Internal transition
Half-life:  109.0 [d]
Decay constant:  7.3601e-08 [1/s]
Daughters:  Te-127 (97.6%), I-127 (2.4%)
Radioactive daughters:  Te-127

Mean alpha energy:  0.0 [MeV]
Mean electron energy:  0.08237 [MeV]
Mean photon energy:  0.01133 [MeV]
Air kerma rate constant, Γ₁₀:  2.531e-18 [Gy·m²/Bq·s]
Air kerma coefficient, K_air:  2.531e-18 [Gy·m²/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or electrons), Δ_wp:  1.320e-14 [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-:  1.320e-14 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δ_p:  1.815e-15 [Gy·kg/Bq·s]

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-127m DPK.csv

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-127m Summary Spectrum.csv

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-127m Beta 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-127m Summary Spectrum.csv

 

Energy [MeV]	Yield [#/nt] if > 0.01	Radiation type
1.36124e-05	1.184e+01	X-ray
1.52660e-05	2.342e-01	X-ray
3.75695e-03	3.331e-02	X-ray
4.02446e-03	1.267e-02	X-ray
2.71868e-02	1.026e-01	X-ray
2.74652e-02	1.910e-01	X-ray
3.09378e-02	1.759e-02	X-ray
3.09901e-02	3.411e-02	X-ray
2.54389e-01	2.385e-02	Beta
2.29179e-05	5.787e+00	Auger electron
2.48461e-05	1.947e+00	Auger electron
2.70119e-05	3.509e-02	Auger electron
2.89499e-05	1.129e-01	Auger electron
1.19659e-04	6.771e-01	Auger electron
1.25053e-04	1.293e-02	Auger electron
3.14947e-04	1.233e-01	Auger electron
4.49803e-04	1.478e+00	Auger electron
4.76927e-04	3.010e-02	Auger electron
5.42297e-04	5.713e-02	Auger electron
3.07365e-03	5.723e-01	Auger electron
3.20467e-03	1.181e-02	Auger electron
3.66785e-03	1.619e-01	Auger electron
4.28470e-03	1.145e-02	Auger electron
2.26653e-02	3.316e-02	Auger electron
2.44660e-02	1.621e-02	Conversion electron
2.65056e-02	1.461e-02	Auger electron
5.64550e-02	4.065e-01	Conversion electron
8.33458e-02	1.500e-01	Conversion electron
8.36418e-02	3.419e-02	Conversion electron
8.39203e-02	2.554e-01	Conversion electron
8.74452e-02	1.051e-01	Conversion electron
8.82600e-02	2.397e-02	Conversion 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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