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Radionuclide Dosimetric Data Sheets
Thallium-190m
Summary data
General
Classification
Isotope: Tl-190m
Atomic number (Z): 81
Mass number (A): 190
Neutron number (N): 109
Radioactive decay
Decay modes: β+, Electron capture
Half-life: 3.7 [m]
Decay constant: 3.1223e-03 [1/s]
Daughters: Hg-190 (100.0%)
Radioactive daughters: Hg-190
Dosimetric constants
Mean alpha energy: 0.0 [MeV]
Mean electron energy: 0.79845 [MeV]
Mean photon energy: 2.45502 [MeV]
Air kerma rate constant, Γ10: 7.880e-17 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 9.502e-17 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 1.279e-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-:
1.279e-13 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 3.933e-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-190m 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-190m 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-190m Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
1.47035e-05 |
9.048e+00 |
X-ray |
|
2.22255e-03 |
2.962e-02 |
X-ray |
|
9.98618e-03 |
8.644e-02 |
X-ray |
|
1.18592e-02 |
5.674e-02 |
X-ray |
|
1.19285e-02 |
1.631e-02 |
X-ray |
|
1.38758e-02 |
1.133e-02 |
X-ray |
|
6.90989e-02 |
1.540e-01 |
X-ray |
|
7.10661e-02 |
2.609e-01 |
X-ray |
|
8.00792e-02 |
2.882e-02 |
X-ray |
|
8.05161e-02 |
5.579e-02 |
X-ray |
|
8.27860e-02 |
1.331e-02 |
X-ray |
|
1.96800e-01 |
4.560e-02 |
Gamma |
|
2.40100e-01 |
3.466e-02 |
Gamma |
|
2.57000e-01 |
1.550e-02 |
Gamma |
|
3.05300e-01 |
1.550e-01 |
Gamma |
|
3.13700e-01 |
1.368e-02 |
Gamma |
|
3.46500e-01 |
1.277e-02 |
Gamma |
|
3.70300e-01 |
4.469e-02 |
Gamma |
|
4.16400e-01 |
9.120e-01 |
Gamma |
|
4.45100e-01 |
1.003e-02 |
Gamma |
|
4.66100e-01 |
1.824e-02 |
Gamma |
|
4.78300e-01 |
1.186e-02 |
Gamma |
|
5.11000e-01 |
8.382e-01 |
Annihilation photon |
|
5.43900e-01 |
5.654e-02 |
Gamma |
|
5.57000e-01 |
6.384e-02 |
Gamma |
|
6.04300e-01 |
1.550e-02 |
Gamma |
|
6.15300e-01 |
4.286e-02 |
Gamma |
|
6.25400e-01 |
8.208e-01 |
Gamma |
|
6.83500e-01 |
7.114e-02 |
Gamma |
|
6.92100e-01 |
4.742e-02 |
Gamma |
|
7.31100e-01 |
3.739e-01 |
Gamma |
|
7.51100e-01 |
1.094e-02 |
Gamma |
|
8.00100e-01 |
1.487e-02 |
Gamma |
|
8.39700e-01 |
2.371e-01 |
Gamma |
|
1.03090e+00 |
1.231e-02 |
Gamma |
|
1.09990e+00 |
4.378e-02 |
Gamma |
|
1.14250e+00 |
3.466e-02 |
Gamma |
|
1.19470e+00 |
2.098e-02 |
Gamma |
|
1.24090e+00 |
1.368e-02 |
Gamma |
|
1.27670e+00 |
1.277e-02 |
Gamma |
|
1.32340e+00 |
1.550e-02 |
Gamma |
|
1.55880e+00 |
1.113e-02 |
Gamma |
|
1.63392e+00 |
2.096e-02 |
Positron |
|
1.63976e+00 |
1.048e-02 |
Positron |
|
1.65960e+00 |
1.048e-02 |
Positron |
|
1.70071e+00 |
2.306e-02 |
Positron |
|
1.70801e+00 |
3.144e-02 |
Positron |
|
1.72610e+00 |
1.258e-02 |
Positron |
|
1.73110e+00 |
2.934e-02 |
Positron |
|
1.81022e+00 |
8.698e-02 |
Positron |
|
1.84789e+00 |
4.402e-02 |
Positron |
|
1.95001e+00 |
9.222e-02 |
Positron |
|
4.20445e-05 |
2.048e+00 |
Auger electron |
|
6.98835e-05 |
2.997e+00 |
Auger electron |
|
1.74648e-04 |
1.576e+00 |
Auger electron |
|
4.15466e-04 |
3.315e-01 |
Auger electron |
|
8.38585e-04 |
1.021e-01 |
Auger electron |
|
1.80778e-03 |
8.136e-01 |
Auger electron |
|
2.04034e-03 |
8.994e-02 |
Auger electron |
|
7.65374e-03 |
2.449e-01 |
Auger electron |
|
9.86236e-03 |
1.047e-01 |
Auger electron |
|
1.20986e-02 |
1.081e-02 |
Auger electron |
|
5.57212e-02 |
1.367e-02 |
Auger electron |
|
3.33047e-01 |
2.688e-02 |
Conversion electron |
|
5.42047e-01 |
1.012e-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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