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Radionuclide Dosimetric Data Sheets
Thallium-197
Summary data
General
Classification
Isotope: Tl-197
Atomic number (Z): 81
Mass number (A): 197
Neutron number (N): 116
Radioactive decay
Decay modes: β+, Electron capture
Half-life: 2.84 [h]
Decay constant: 6.7796e-05 [1/s]
Daughters: Hg-197 (100.0%)
Radioactive daughters: Hg-197
Dosimetric constants
Mean alpha energy: 0.0 [MeV]
Mean electron energy: 0.05436 [MeV]
Mean photon energy: 0.45866 [MeV]
Air kerma rate constant, Γ10: 2.294e-17 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 2.334e-17 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 8.709e-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-:
8.709e-15 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 7.349e-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-197 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-197 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-197 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-197 Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
1.47031e-05 |
1.654e+01 |
X-ray |
|
2.22239e-03 |
5.414e-02 |
X-ray |
|
8.75019e-03 |
1.029e-02 |
X-ray |
|
9.89221e-03 |
1.795e-02 |
X-ray |
|
9.98619e-03 |
1.582e-01 |
X-ray |
|
1.18592e-02 |
1.006e-01 |
X-ray |
|
1.19285e-02 |
2.985e-02 |
X-ray |
|
1.38758e-02 |
2.010e-02 |
X-ray |
|
6.90989e-02 |
2.793e-01 |
X-ray |
|
7.10661e-02 |
4.733e-01 |
X-ray |
|
8.00792e-02 |
5.229e-02 |
X-ray |
|
8.05161e-02 |
1.012e-01 |
X-ray |
|
8.26796e-02 |
1.233e-02 |
X-ray |
|
8.27860e-02 |
2.414e-02 |
X-ray |
|
1.33990e-01 |
2.015e-02 |
Gamma |
|
1.52220e-01 |
7.280e-02 |
Gamma |
|
3.07800e-01 |
1.430e-02 |
Gamma |
|
3.08600e-01 |
2.210e-02 |
Gamma |
|
4.25840e-01 |
1.300e-01 |
Gamma |
|
4.33140e-01 |
2.522e-02 |
Gamma |
|
4.51420e-01 |
1.066e-02 |
Gamma |
|
5.11000e-01 |
2.043e-02 |
Annihilation photon |
|
5.77970e-01 |
4.472e-02 |
Gamma |
|
6.74280e-01 |
1.469e-02 |
Gamma |
|
7.01530e-01 |
1.027e-02 |
Gamma |
|
7.92060e-01 |
1.768e-02 |
Gamma |
|
8.57180e-01 |
2.067e-02 |
Gamma |
|
8.92470e-01 |
1.144e-02 |
Gamma |
|
9.82750e-01 |
1.261e-02 |
Gamma |
|
1.38535e+00 |
1.261e-02 |
Gamma |
|
1.41134e+00 |
4.550e-02 |
Gamma |
|
4.20438e-05 |
3.745e+00 |
Auger electron |
|
6.98929e-05 |
5.478e+00 |
Auger electron |
|
1.74631e-04 |
2.880e+00 |
Auger electron |
|
4.15369e-04 |
6.068e-01 |
Auger electron |
|
8.23021e-04 |
1.960e-01 |
Auger electron |
|
1.80747e-03 |
1.487e+00 |
Auger electron |
|
2.03992e-03 |
1.643e-01 |
Auger electron |
|
7.64882e-03 |
4.458e-01 |
Auger electron |
|
9.85739e-03 |
1.906e-01 |
Auger electron |
|
1.20937e-02 |
1.967e-02 |
Auger electron |
|
5.57212e-02 |
2.480e-02 |
Auger electron |
|
6.69357e-02 |
1.342e-02 |
Auger electron |
|
6.88670e-02 |
1.494e-01 |
Conversion electron |
|
1.19736e-01 |
1.072e-02 |
Conversion electron |
|
1.37394e-01 |
2.291e-02 |
Conversion electron |
|
3.42487e-01 |
1.584e-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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