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Radionuclide Dosimetric Data Sheets
Thorium-230
Summary data
General
Classification
Isotope: Th-230
Atomic number (Z): 90
Mass number (A): 230
Neutron number (N): 140
Radioactive decay
Decay modes: α
Half-life: 75380.0 [y]
Decay constant: 2.9139e-13 [1/s]
Daughters: Ra-226 (100.0%)
Radioactive daughters: Ra-226
Dosimetric constants
Mean alpha energy: 4.7538 [MeV]
Mean electron energy: 0.01459 [MeV]
Mean photon energy: 0.00177 [MeV]
Air kerma rate constant, Γ10: 2.446e-18 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 2.446e-18 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 7.640e-13 [Gy·kg/Bq·s]
Equilibrium dose constant for alphas, Δα: 7.616e-13
[Gy·kg/Bq·s]
Equilibrium dose constant for betas/electrons, Δβ-,β+,e-:
2.338e-15 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 2.836e-16
[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-230 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-230 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-230 Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
7.12319e-05 |
2.444e+00 |
X-ray |
|
2.89157e-03 |
1.245e-02 |
X-ray |
|
1.23447e-02 |
2.638e-02 |
X-ray |
|
1.53013e-02 |
3.324e-02 |
X-ray |
|
2.57743e-05 |
6.715e-01 |
Auger electron |
|
1.20757e-04 |
6.800e-01 |
Auger electron |
|
1.81348e-04 |
3.876e-01 |
Auger electron |
|
4.73071e-04 |
9.747e-02 |
Auger electron |
|
2.15218e-03 |
1.150e-02 |
Auger electron |
|
2.22649e-03 |
2.148e-01 |
Auger electron |
|
2.60119e-03 |
3.467e-02 |
Auger electron |
|
9.52526e-03 |
5.841e-02 |
Auger electron |
|
1.24612e-02 |
2.836e-02 |
Auger electron |
|
4.91120e-02 |
9.209e-02 |
Conversion electron |
|
5.22160e-02 |
7.641e-02 |
Conversion electron |
|
6.38983e-02 |
4.667e-02 |
Conversion electron |
|
6.76720e-02 |
1.571e-02 |
Conversion electron |
|
4.62050e+00 |
2.343e-01 |
Alpha |
|
4.68699e+00 |
7.641e-01 |
Alpha |
|
8.18319e-02 |
2.343e-01 |
Alpha recoil |
|
8.30095e-02 |
7.641e-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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