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Radionuclide Dosimetric Data Sheets
Thallium-200
Summary data
General
Classification
Isotope: Tl-200
Atomic number (Z): 81
Mass number (A): 200
Neutron number (N): 119
Radioactive decay
Decay modes: β+, Electron capture
Half-life: 26.1 [h]
Decay constant: 7.3770e-06 [1/s]
Daughters: Hg-200 (100.0%)
Radioactive daughters: None
Dosimetric constants
Mean alpha energy: 0.0 [MeV]
Mean electron energy: 0.04076 [MeV]
Mean photon energy: 1.31059 [MeV]
Air kerma rate constant, Γ10: 5.226e-17 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 5.240e-17 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 6.530e-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-:
6.530e-15 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 2.100e-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-200 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-200 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-200 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-200 Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
1.47030e-05 |
1.404e+01 |
X-ray |
|
2.22238e-03 |
4.593e-02 |
X-ray |
|
9.89221e-03 |
1.520e-02 |
X-ray |
|
9.98619e-03 |
1.339e-01 |
X-ray |
|
1.18592e-02 |
8.409e-02 |
X-ray |
|
1.19285e-02 |
2.527e-02 |
X-ray |
|
1.38758e-02 |
1.680e-02 |
X-ray |
|
6.90989e-02 |
2.359e-01 |
X-ray |
|
7.10661e-02 |
3.998e-01 |
X-ray |
|
8.00792e-02 |
4.417e-02 |
X-ray |
|
8.05161e-02 |
8.548e-02 |
X-ray |
|
8.26796e-02 |
1.041e-02 |
X-ray |
|
8.27860e-02 |
2.039e-02 |
X-ray |
|
3.67942e-01 |
8.720e-01 |
Gamma |
|
5.79280e-01 |
1.378e-01 |
Gamma |
|
6.28630e-01 |
1.003e-02 |
Gamma |
|
6.61350e-01 |
2.276e-02 |
Gamma |
|
7.01560e-01 |
1.291e-02 |
Gamma |
|
7.87100e-01 |
1.029e-02 |
Gamma |
|
8.28320e-01 |
1.081e-01 |
Gamma |
|
8.86150e-01 |
2.023e-02 |
Gamma |
|
1.20570e+00 |
2.991e-01 |
Gamma |
|
1.22550e+00 |
3.357e-02 |
Gamma |
|
1.27352e+00 |
3.314e-02 |
Gamma |
|
1.36290e+00 |
3.401e-02 |
Gamma |
|
1.40764e+00 |
1.448e-02 |
Gamma |
|
1.51490e+00 |
4.011e-02 |
Gamma |
|
1.60450e+00 |
1.168e-02 |
Gamma |
|
4.20438e-05 |
3.179e+00 |
Auger electron |
|
6.99139e-05 |
4.649e+00 |
Auger electron |
|
1.74634e-04 |
2.444e+00 |
Auger electron |
|
4.15540e-04 |
5.163e-01 |
Auger electron |
|
8.14256e-04 |
1.717e-01 |
Auger electron |
|
1.80740e-03 |
1.261e+00 |
Auger electron |
|
2.03985e-03 |
1.394e-01 |
Auger electron |
|
7.64815e-03 |
3.769e-01 |
Auger electron |
|
9.85687e-03 |
1.611e-01 |
Auger electron |
|
1.20935e-02 |
1.663e-02 |
Auger electron |
|
5.57212e-02 |
2.095e-02 |
Auger electron |
|
6.69357e-02 |
1.134e-02 |
Auger electron |
|
2.84589e-01 |
3.409e-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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