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Radionuclide Dosimetric Data Sheets
Thallium-201
Summary data
General
Classification
Isotope: Tl-201
Atomic number (Z): 81
Mass number (A): 201
Neutron number (N): 120
Radioactive decay
Decay modes: Electron capture
Half-life: 72.91 [h]
Decay constant: 2.6407e-06 [1/s]
Daughters: Hg-201 (100.0%)
Radioactive daughters: None
Dosimetric constants
Mean alpha energy: 0.0 [MeV]
Mean electron energy: 0.04469 [MeV]
Mean photon energy: 0.09381 [MeV]
Air kerma rate constant, Γ10: 1.152e-17 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 1.152e-17 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 7.160e-15 [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-:
7.160e-15 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 1.503e-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/Tl-201 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/Tl-201 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/Tl-201 Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
1.47014e-05 |
2.281e+01 |
X-ray |
|
2.22251e-03 |
6.729e-02 |
X-ray |
|
8.75019e-03 |
1.220e-02 |
X-ray |
|
9.89221e-03 |
2.129e-02 |
X-ray |
|
9.98620e-03 |
1.875e-01 |
X-ray |
|
1.15521e-02 |
1.163e-02 |
X-ray |
|
1.18592e-02 |
1.055e-01 |
X-ray |
|
1.19286e-02 |
3.539e-02 |
X-ray |
|
1.19891e-02 |
1.318e-02 |
X-ray |
|
1.38758e-02 |
2.108e-02 |
X-ray |
|
6.90989e-02 |
2.736e-01 |
X-ray |
|
7.10661e-02 |
4.637e-01 |
X-ray |
|
8.00792e-02 |
5.122e-02 |
X-ray |
|
8.05161e-02 |
9.914e-02 |
X-ray |
|
8.26796e-02 |
1.208e-02 |
X-ray |
|
8.27860e-02 |
2.365e-02 |
X-ray |
|
1.35340e-01 |
2.565e-02 |
Gamma |
|
1.67430e-01 |
1.000e-01 |
Gamma |
|
4.20807e-05 |
5.339e+00 |
Auger electron |
|
7.23727e-05 |
7.402e+00 |
Auger electron |
|
1.75987e-04 |
4.156e+00 |
Auger electron |
|
4.17962e-04 |
7.762e-01 |
Auger electron |
|
7.43508e-04 |
3.529e-01 |
Auger electron |
|
1.56500e-03 |
3.800e-01 |
Conversion electron |
|
1.80687e-03 |
1.846e+00 |
Auger electron |
|
2.03933e-03 |
2.038e-01 |
Auger electron |
|
2.39401e-03 |
1.006e-02 |
Auger electron |
|
7.65921e-03 |
5.292e-01 |
Auger electron |
|
9.87109e-03 |
2.263e-01 |
Auger electron |
|
1.21137e-02 |
2.339e-02 |
Auger electron |
|
1.57740e-02 |
8.522e-02 |
Conversion electron |
|
1.73640e-02 |
7.477e-02 |
Conversion electron |
|
2.77631e-02 |
2.220e-02 |
Conversion electron |
|
2.93531e-02 |
1.957e-02 |
Conversion electron |
|
5.19870e-02 |
7.337e-02 |
Conversion electron |
|
5.57212e-02 |
2.429e-02 |
Auger electron |
|
6.69357e-02 |
1.315e-02 |
Auger electron |
|
8.40770e-02 |
1.560e-01 |
Conversion electron |
|
1.20514e-01 |
1.123e-02 |
Conversion electron |
|
1.52604e-01 |
2.391e-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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