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Radionuclide Dosimetric Data Sheets
Thallium-208
Summary data
General
Classification
Isotope: Tl-208
Atomic number (Z): 81
Mass number (A): 208
Neutron number (N): 127
Radioactive decay
Decay modes: β-
Half-life: 3.053 [m]
Decay constant: 3.7840e-03 [1/s]
Daughters: Pb-208 (100.0%)
Radioactive daughters: None
Dosimetric constants
Mean alpha energy: 0.0 [MeV]
Mean electron energy: 0.61134 [MeV]
Mean photon energy: 3.36025 [MeV]
Air kerma rate constant, Γ10: 1.018e-16 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 1.018e-16 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 9.795e-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-:
9.795e-14 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 5.384e-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/Tl-208 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-208 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/Tl-208 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/Tl-208 Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
2.66211e-05 |
1.230e+00 |
X-ray |
|
1.05510e-02 |
1.308e-02 |
X-ray |
|
7.30390e-02 |
2.272e-02 |
X-ray |
|
7.52501e-02 |
3.815e-02 |
X-ray |
|
2.77358e-01 |
6.307e-02 |
Gamma |
|
5.10770e-01 |
2.261e-01 |
Gamma |
|
5.83191e-01 |
8.448e-01 |
Gamma |
|
7.63130e-01 |
1.815e-02 |
Gamma |
|
8.60564e-01 |
1.242e-01 |
Gamma |
|
2.61453e+00 |
9.916e-01 |
Gamma |
|
3.40873e-01 |
3.110e-02 |
Beta |
|
4.39430e-01 |
2.466e-01 |
Beta |
|
5.33213e-01 |
2.194e-01 |
Beta |
|
6.47222e-01 |
4.901e-01 |
Beta |
|
4.21774e-05 |
2.762e-01 |
Auger electron |
|
8.22380e-05 |
3.982e-01 |
Auger electron |
|
1.73800e-04 |
2.099e-01 |
Auger electron |
|
4.21687e-04 |
4.644e-02 |
Auger electron |
|
9.80189e-04 |
1.392e-02 |
Auger electron |
|
1.91050e-03 |
1.121e-01 |
Auger electron |
|
2.17077e-03 |
1.397e-02 |
Auger electron |
|
8.04568e-03 |
3.327e-02 |
Auger electron |
|
1.04208e-02 |
1.472e-02 |
Auger electron |
|
1.89068e-01 |
2.883e-02 |
Conversion electron |
|
4.22480e-01 |
2.002e-02 |
Conversion electron |
|
4.94901e-01 |
1.287e-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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