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Radionuclide Dosimetric Data Sheets
Thallium-195
Summary data
General
Classification
Isotope: Tl-195
Atomic number (Z): 81
Mass number (A): 195
Neutron number (N): 114
Radioactive decay
Decay modes: β+, Electron capture
Half-life: 1.16 [h]
Decay constant: 1.6598e-04 [1/s]
Daughters: Hg-195 (99.7%), Hg-195m (0.344%)
Radioactive daughters: Hg-195, Hg-195m
Dosimetric constants
Mean alpha energy: 0.0 [MeV]
Mean electron energy: 0.07401 [MeV]
Mean photon energy: 1.22504 [MeV]
Air kerma rate constant, Γ10: 5.083e-17 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 5.131e-17 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 1.186e-14 [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-:
1.186e-14 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 1.963e-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-195 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-195 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-195 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-195 Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
1.47015e-05 |
2.691e+01 |
X-ray |
|
2.22245e-03 |
8.747e-02 |
X-ray |
|
8.75019e-03 |
1.505e-02 |
X-ray |
|
9.89222e-03 |
2.626e-02 |
X-ray |
|
9.98621e-03 |
2.313e-01 |
X-ray |
|
1.15521e-02 |
2.092e-02 |
X-ray |
|
1.18592e-02 |
1.158e-01 |
X-ray |
|
1.19286e-02 |
4.366e-02 |
X-ray |
|
1.19891e-02 |
2.371e-02 |
X-ray |
|
1.38758e-02 |
2.313e-02 |
X-ray |
|
3.70900e-02 |
2.476e-02 |
Gamma |
|
6.90989e-02 |
2.434e-01 |
X-ray |
|
7.10661e-02 |
4.125e-01 |
X-ray |
|
8.00792e-02 |
4.557e-02 |
X-ray |
|
8.05161e-02 |
8.818e-02 |
X-ray |
|
8.26796e-02 |
1.074e-02 |
X-ray |
|
8.27860e-02 |
2.104e-02 |
X-ray |
|
2.25930e-01 |
1.281e-02 |
Gamma |
|
2.42150e-01 |
4.305e-02 |
Gamma |
|
2.47300e-01 |
1.291e-02 |
Gamma |
|
2.79190e-01 |
3.748e-02 |
Gamma |
|
3.00600e-01 |
2.405e-02 |
Gamma |
|
5.11000e-01 |
2.468e-02 |
Annihilation photon |
|
5.42160e-01 |
1.050e-02 |
Gamma |
|
5.58380e-01 |
2.551e-02 |
Gamma |
|
5.63520e-01 |
1.050e-01 |
Gamma |
|
5.92590e-01 |
1.197e-02 |
Gamma |
|
7.77680e-01 |
1.113e-02 |
Gamma |
|
8.14680e-01 |
1.890e-02 |
Gamma |
|
8.84470e-01 |
9.975e-02 |
Gamma |
|
9.21590e-01 |
2.247e-02 |
Gamma |
|
9.67460e-01 |
2.142e-02 |
Gamma |
|
1.10033e+00 |
2.341e-02 |
Gamma |
|
1.12166e+00 |
2.100e-02 |
Gamma |
|
1.26951e+00 |
2.436e-02 |
Gamma |
|
1.34778e+00 |
1.166e-02 |
Gamma |
|
1.36388e+00 |
8.400e-02 |
Gamma |
|
1.51162e+00 |
1.449e-02 |
Gamma |
|
1.70588e+00 |
1.491e-02 |
Gamma |
|
1.97775e+00 |
1.764e-02 |
Gamma |
|
4.20471e-05 |
6.116e+00 |
Auger electron |
|
7.02602e-05 |
8.903e+00 |
Auger electron |
|
1.74734e-04 |
4.672e+00 |
Auger electron |
|
4.20101e-04 |
1.022e+00 |
Auger electron |
|
7.03828e-04 |
6.036e-01 |
Auger electron |
|
1.38400e-03 |
6.977e-02 |
Conversion electron |
|
1.80605e-03 |
2.397e+00 |
Auger electron |
|
2.03815e-03 |
2.643e-01 |
Auger electron |
|
2.39268e-03 |
1.303e-02 |
Auger electron |
|
7.67971e-03 |
6.591e-01 |
Auger electron |
|
9.89578e-03 |
2.820e-01 |
Auger electron |
|
1.21461e-02 |
2.918e-02 |
Auger electron |
|
1.33731e-02 |
1.932e-02 |
Conversion electron |
|
2.22640e-02 |
4.730e-01 |
Conversion electron |
|
2.28360e-02 |
5.172e-02 |
Conversion electron |
|
2.48030e-02 |
1.053e-02 |
Conversion electron |
|
3.42531e-02 |
1.253e-01 |
Conversion electron |
|
3.70900e-02 |
3.927e-02 |
Conversion electron |
|
5.57212e-02 |
2.161e-02 |
Auger electron |
|
6.69357e-02 |
1.170e-02 |
Auger electron |
|
1.58797e-01 |
2.124e-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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