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Radionuclide Dosimetric Data Sheets
Thallium-202
Summary data
General
Classification
Isotope: Tl-202
Atomic number (Z): 81
Mass number (A): 202
Neutron number (N): 121
Radioactive decay
Decay modes: Electron capture
Half-life: 12.23 [d]
Decay constant: 6.5597e-07 [1/s]
Daughters: Hg-202 (100.0%)
Radioactive daughters: None
Dosimetric constants
Mean alpha energy: 0.0 [MeV]
Mean electron energy: 0.02328 [MeV]
Mean photon energy: 0.46577 [MeV]
Air kerma rate constant, Γ10: 2.316e-17 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 2.316e-17 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 3.730e-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-:
3.730e-15 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 7.462e-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-202 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-202 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-202 Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
1.47029e-05 |
1.349e+01 |
X-ray |
|
2.22232e-03 |
4.416e-02 |
X-ray |
|
9.89221e-03 |
1.465e-02 |
X-ray |
|
9.98619e-03 |
1.290e-01 |
X-ray |
|
1.18592e-02 |
8.051e-02 |
X-ray |
|
1.19285e-02 |
2.435e-02 |
X-ray |
|
1.38758e-02 |
1.608e-02 |
X-ray |
|
6.90989e-02 |
2.286e-01 |
X-ray |
|
7.10661e-02 |
3.874e-01 |
X-ray |
|
8.00792e-02 |
4.279e-02 |
X-ray |
|
8.05161e-02 |
8.281e-02 |
X-ray |
|
8.26796e-02 |
1.009e-02 |
X-ray |
|
8.27860e-02 |
1.975e-02 |
X-ray |
|
4.39560e-01 |
9.140e-01 |
Gamma |
|
4.20435e-05 |
3.056e+00 |
Auger electron |
|
6.99088e-05 |
4.469e+00 |
Auger electron |
|
1.74625e-04 |
2.349e+00 |
Auger electron |
|
4.15400e-04 |
4.961e-01 |
Auger electron |
|
8.13839e-04 |
1.647e-01 |
Auger electron |
|
1.80732e-03 |
1.213e+00 |
Auger electron |
|
2.03973e-03 |
1.340e-01 |
Auger electron |
|
7.64604e-03 |
3.626e-01 |
Auger electron |
|
9.85460e-03 |
1.550e-01 |
Auger electron |
|
1.20910e-02 |
1.600e-02 |
Auger electron |
|
5.57212e-02 |
2.029e-02 |
Auger electron |
|
6.69357e-02 |
1.099e-02 |
Auger electron |
|
3.56207e-01 |
2.386e-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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