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Radionuclide Dosimetric Data Sheets
Thallium-190
Summary data
General
Classification
Isotope: Tl-190
Atomic number (Z): 81
Mass number (A): 190
Neutron number (N): 109
Radioactive decay
Decay modes: β+, Electron capture
Half-life: 2.6 [m]
Decay constant: 4.4433e-03 [1/s]
Daughters: Hg-190 (100.0%)
Radioactive daughters: Hg-190
Dosimetric constants
Mean alpha energy: 0.0 [MeV]
Mean electron energy: 1.52881 [MeV]
Mean photon energy: 1.29142 [MeV]
Air kerma rate constant, Γ10: 2.670e-17 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 5.058e-17 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 2.449e-13 [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-:
2.449e-13 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 2.069e-13
[Gy·kg/Bq·s]
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-190 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-190 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-190 Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
1.47032e-05 |
5.501e+00 |
X-ray |
|
2.22237e-03 |
1.802e-02 |
X-ray |
|
9.98619e-03 |
5.286e-02 |
X-ray |
|
1.18592e-02 |
3.394e-02 |
X-ray |
|
6.90989e-02 |
9.557e-02 |
X-ray |
|
7.10661e-02 |
1.620e-01 |
X-ray |
|
8.00792e-02 |
1.789e-02 |
X-ray |
|
8.05161e-02 |
3.463e-02 |
X-ray |
|
4.16400e-01 |
7.900e-01 |
Gamma |
|
5.11000e-01 |
1.234e+00 |
Annihilation photon |
|
5.57000e-01 |
1.264e-02 |
Gamma |
|
6.25400e-01 |
1.106e-01 |
Gamma |
|
6.83500e-01 |
8.690e-02 |
Gamma |
|
1.09990e+00 |
7.110e-02 |
Gamma |
|
1.14250e+00 |
3.002e-02 |
Gamma |
|
1.97109e+00 |
1.200e-02 |
Positron |
|
2.01626e+00 |
2.700e-02 |
Positron |
|
2.18775e+00 |
4.001e-02 |
Positron |
|
2.22775e+00 |
8.501e-02 |
Positron |
|
2.54494e+00 |
3.901e-01 |
Positron |
|
2.65388e+00 |
5.401e-02 |
Positron |
|
4.20437e-05 |
1.245e+00 |
Auger electron |
|
6.98752e-05 |
1.822e+00 |
Auger electron |
|
1.74625e-04 |
9.582e-01 |
Auger electron |
|
4.15133e-04 |
2.014e-01 |
Auger electron |
|
8.33366e-04 |
6.268e-02 |
Auger electron |
|
1.80751e-03 |
4.949e-01 |
Auger electron |
|
2.03995e-03 |
5.470e-02 |
Auger electron |
|
7.64782e-03 |
1.490e-01 |
Auger electron |
|
9.85611e-03 |
6.368e-02 |
Auger electron |
|
3.33047e-01 |
2.328e-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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