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Radionuclide Dosimetric Data Sheets
Thorium-223
Summary data
General
Classification
Isotope: Th-223
Atomic number (Z): 90
Mass number (A): 223
Neutron number (N): 133
Radioactive decay
Decay modes: α
Half-life: 0.6 [s]
Decay constant: 1.1552e+00 [1/s]
Daughters: Ra-219 (100.0%)
Radioactive daughters: Ra-219
Dosimetric constants
Mean alpha energy: 7.4133 [MeV]
Mean electron energy: 0.05753 [MeV]
Mean photon energy: 0.07541 [MeV]
Air kerma rate constant, Γ10: 1.310e-17 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 1.310e-17 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 1.197e-12 [Gy·kg/Bq·s]
Equilibrium dose constant for alphas, Δα: 1.188e-12
[Gy·kg/Bq·s]
Equilibrium dose constant for betas/electrons, Δβ-,β+,e-:
9.217e-15 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 1.208e-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/Th-223 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/Th-223 Summary 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/Th-223 Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
7.12213e-05 |
1.140e+01 |
X-ray |
|
2.88266e-03 |
5.835e-02 |
X-ray |
|
1.21973e-02 |
1.625e-02 |
X-ray |
|
1.23447e-02 |
1.429e-01 |
X-ray |
|
1.48529e-02 |
2.903e-02 |
X-ray |
|
1.53013e-02 |
9.031e-02 |
X-ray |
|
1.79232e-02 |
1.967e-02 |
X-ray |
|
8.57602e-02 |
1.523e-01 |
X-ray |
|
8.88641e-02 |
2.488e-01 |
X-ray |
|
9.98380e-02 |
2.833e-02 |
X-ray |
|
1.00546e-01 |
5.514e-02 |
X-ray |
|
1.03453e-01 |
1.391e-02 |
X-ray |
|
1.13700e-01 |
1.600e-02 |
Gamma |
|
1.40000e-01 |
5.800e-02 |
Gamma |
|
1.52000e-01 |
3.700e-02 |
Gamma |
|
2.55858e-05 |
3.139e+00 |
Auger electron |
|
1.20281e-04 |
3.170e+00 |
Auger electron |
|
1.35380e-04 |
1.389e-02 |
Auger electron |
|
1.81261e-04 |
1.785e+00 |
Auger electron |
|
4.65988e-04 |
4.585e-01 |
Auger electron |
|
1.14400e-03 |
2.429e-02 |
Conversion electron |
|
1.32977e-03 |
1.616e-01 |
Auger electron |
|
2.21417e-03 |
1.010e+00 |
Auger electron |
|
2.58448e-03 |
1.622e-01 |
Auger electron |
|
9.27675e-03 |
2.700e-01 |
Auger electron |
|
9.38001e-03 |
1.499e-01 |
Conversion electron |
|
1.22002e-02 |
1.307e-01 |
Auger electron |
|
1.28263e-02 |
1.253e-02 |
Conversion electron |
|
1.51545e-02 |
1.498e-02 |
Auger electron |
|
1.89680e-02 |
2.468e-02 |
Conversion electron |
|
1.96400e-02 |
2.774e-02 |
Conversion electron |
|
2.27440e-02 |
2.459e-02 |
Conversion electron |
|
3.34400e-02 |
2.530e-02 |
Conversion electron |
|
3.44263e-02 |
1.998e-02 |
Conversion electron |
|
3.56800e-02 |
3.001e-01 |
Conversion electron |
|
3.65440e-02 |
2.272e-02 |
Conversion electron |
|
4.76800e-02 |
8.048e-02 |
Conversion electron |
|
4.82263e-02 |
1.323e-02 |
Conversion electron |
|
6.84262e-02 |
1.137e-02 |
Auger electron |
|
6.87680e-02 |
3.744e-02 |
Conversion electron |
|
7.79680e-02 |
2.209e-02 |
Conversion electron |
|
9.44680e-02 |
2.502e-02 |
Conversion electron |
|
1.20768e-01 |
4.991e-02 |
Conversion electron |
|
1.32768e-01 |
1.367e-02 |
Conversion electron |
|
1.33440e-01 |
1.270e-02 |
Conversion electron |
|
1.36226e-01 |
1.326e-02 |
Conversion electron |
|
6.99417e+00 |
1.493e-02 |
Alpha |
|
7.03371e+00 |
1.891e-02 |
Alpha |
|
7.28193e+00 |
2.587e-01 |
Alpha |
|
7.29369e+00 |
5.473e-01 |
Alpha |
|
7.31951e+00 |
1.294e-01 |
Alpha |
|
1.27830e-01 |
1.493e-02 |
Alpha recoil |
|
1.28553e-01 |
1.891e-02 |
Alpha recoil |
|
1.33090e-01 |
2.587e-01 |
Alpha recoil |
|
1.33305e-01 |
5.473e-01 |
Alpha recoil |
|
1.33777e-01 |
1.294e-01 |
Alpha recoil |
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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