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Radionuclide Dosimetric Data Sheets

Thallium-198

Summary data

General

Classification

Isotope:  Tl-198
Atomic number (Z):  81
Mass number (A):  198
Neutron number (N):  117

Radioactive decay

Decay modes:  β+, Electron capture
Half-life:  5.3 [h]
Decay constant:  3.6328e-05 [1/s]
Daughters:  Hg-198 (100.0%)
Radioactive daughters:  None

Dosimetric constants

Mean alpha energy:  0.0 [MeV]
Mean electron energy:  0.04142 [MeV]
Mean photon energy:  2.01075 [MeV]
Air kerma rate constant, Γ10:  7.267e-17 [Gy·m2/Bq·s]
Air kerma coefficient, Kair:  7.297e-17 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or electrons), Δwp:  6.636e-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-:  6.636e-15 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp:  3.222e-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-198 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-198 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-198 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-198 Summary Spectrum.csv

 

Energy [MeV]

Yield [#/nt] if > 0.01

Radiation type

1.47030e-05

1.364e+01

X-ray

2.22231e-03

4.466e-02

X-ray

9.89221e-03

1.484e-02

X-ray

9.98619e-03

1.307e-01

X-ray

1.18592e-02

8.208e-02

X-ray

1.19285e-02

2.468e-02

X-ray

1.38758e-02

1.640e-02

X-ray

6.90989e-02

2.333e-01

X-ray

7.10661e-02

3.954e-01

X-ray

8.00792e-02

4.368e-02

X-ray

8.05161e-02

8.453e-02

X-ray

8.26796e-02

1.030e-02

X-ray

8.27860e-02

2.017e-02

X-ray

4.11800e-01

8.175e-01

Gamma

5.11000e-01

1.537e-02

Annihilation photon

5.11000e-01

1.046e-02

Gamma

5.96800e-01

1.003e-02

Gamma

6.36700e-01

1.014e-01

Gamma

6.75800e-01

1.090e-01

Gamma

7.59600e-01

1.450e-02

Gamma

7.98700e-01

1.068e-02

Gamma

1.00760e+00

2.747e-02

Gamma

1.08760e+00

2.420e-02

Gamma

1.20060e+00

9.701e-02

Gamma

1.21920e+00

1.079e-02

Gamma

1.31220e+00

4.741e-02

Gamma

1.42060e+00

7.957e-02

Gamma

1.43540e+00

3.488e-02

Gamma

1.44700e+00

4.251e-02

Gamma

1.48960e+00

2.627e-02

Gamma

1.59360e+00

2.125e-02

Gamma

1.65910e+00

1.690e-02

Gamma

1.72080e+00

2.769e-02

Gamma

1.83260e+00

4.251e-02

Gamma

1.89930e+00

2.224e-02

Gamma

2.04020e+00

8.393e-02

Gamma

2.19050e+00

2.660e-02

Gamma

2.48620e+00

1.123e-02

Gamma

4.20435e-05

3.089e+00

Auger electron

6.98968e-05

4.519e+00

Auger electron

1.74622e-04

2.376e+00

Auger electron

4.15265e-04

5.009e-01

Auger electron

8.19177e-04

1.631e-01

Auger electron

1.80735e-03

1.227e+00

Auger electron

2.03975e-03

1.356e-01

Auger electron

7.64570e-03

3.675e-01

Auger electron

9.85413e-03

1.571e-01

Auger electron

1.20902e-02

1.621e-02

Auger electron

5.57212e-02

2.071e-02

Auger electron

6.69357e-02

1.121e-02

Auger electron

3.28447e-01

2.470e-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

 

 

 

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