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Radionuclide Dosimetric Data Sheets
Thallium-199
Summary data
General
Classification
Isotope: Tl-199
Atomic number (Z): 81
Mass number (A): 199
Neutron number (N): 118
Radioactive decay
Decay modes: β+, Electron capture
Half-life: 7.42 [h]
Decay constant: 2.5949e-05 [1/s]
Daughters: Hg-199 (100.0%)
Radioactive daughters: None
Dosimetric constants
Mean alpha energy: 0.0 [MeV]
Mean electron energy: 0.05998 [MeV]
Mean photon energy: 0.25203 [MeV]
Air kerma rate constant, Γ10: 1.643e-17 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 1.644e-17 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 9.610e-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-:
9.610e-15 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 4.038e-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-199 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-199 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-199 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-199 Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
1.47030e-05 |
1.740e+01 |
X-ray |
|
2.22245e-03 |
5.691e-02 |
X-ray |
|
8.75019e-03 |
1.068e-02 |
X-ray |
|
9.89221e-03 |
1.863e-02 |
X-ray |
|
9.98619e-03 |
1.641e-01 |
X-ray |
|
1.18592e-02 |
1.025e-01 |
X-ray |
|
1.19285e-02 |
3.098e-02 |
X-ray |
|
1.38758e-02 |
2.047e-02 |
X-ray |
|
6.90989e-02 |
2.764e-01 |
X-ray |
|
7.10661e-02 |
4.685e-01 |
X-ray |
|
8.00792e-02 |
5.175e-02 |
X-ray |
|
8.05161e-02 |
1.002e-01 |
X-ray |
|
8.26796e-02 |
1.220e-02 |
X-ray |
|
8.27860e-02 |
2.389e-02 |
X-ray |
|
1.58359e-01 |
4.960e-02 |
Gamma |
|
2.08200e-01 |
1.228e-01 |
Gamma |
|
2.47260e-01 |
9.300e-02 |
Gamma |
|
2.84090e-01 |
2.207e-02 |
Gamma |
|
3.33930e-01 |
1.761e-02 |
Gamma |
|
4.03500e-01 |
1.724e-02 |
Gamma |
|
4.55460e-01 |
1.240e-01 |
Gamma |
|
4.92300e-01 |
1.525e-02 |
Gamma |
|
7.50400e-01 |
1.042e-02 |
Gamma |
|
1.01295e+00 |
1.761e-02 |
Gamma |
|
4.20445e-05 |
3.942e+00 |
Auger electron |
|
6.99419e-05 |
5.763e+00 |
Auger electron |
|
1.74650e-04 |
3.030e+00 |
Auger electron |
|
4.16058e-04 |
6.416e-01 |
Auger electron |
|
7.99380e-04 |
2.279e-01 |
Auger electron |
|
1.80738e-03 |
1.562e+00 |
Auger electron |
|
2.03983e-03 |
1.726e-01 |
Auger electron |
|
7.65351e-03 |
4.637e-01 |
Auger electron |
|
9.86298e-03 |
1.983e-01 |
Auger electron |
|
1.21009e-02 |
2.047e-02 |
Auger electron |
|
3.49910e-02 |
4.058e-02 |
Conversion electron |
|
4.69801e-02 |
1.077e-02 |
Conversion electron |
|
5.57212e-02 |
2.454e-02 |
Auger electron |
|
6.69357e-02 |
1.329e-02 |
Auger electron |
|
7.50060e-02 |
1.447e-02 |
Conversion electron |
|
1.24847e-01 |
9.348e-02 |
Conversion electron |
|
1.44105e-01 |
1.251e-02 |
Conversion electron |
|
1.63907e-01 |
4.932e-02 |
Conversion electron |
|
1.93374e-01 |
1.415e-02 |
Conversion electron |
|
3.72107e-01 |
1.264e-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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