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Radionuclide Dosimetric Data Sheets
Francium-223
Summary data
General
Classification
Isotope: Fr-223
Atomic number (Z): 87
Mass number (A): 223
Neutron number (N): 136
Radioactive decay
Decay modes: α, β-
Half-life: 22.0 [m]
Decay constant: 5.2511e-04 [1/s]
Daughters: Ra-223 (100.0%), At-219 (0.006%)
Radioactive daughters: Ra-223, At-219
Dosimetric constants
Mean alpha energy: 0.0003 [MeV]
Mean electron energy: 0.38287 [MeV]
Mean photon energy: 0.05825 [MeV]
Air kerma rate constant, Γ10: 1.127e-17 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 1.127e-17 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 6.139e-14 [Gy·kg/Bq·s]
Equilibrium dose constant for alphas, Δα: 4.807e-17
[Gy·kg/Bq·s]
Equilibrium dose constant for betas/electrons, Δβ-,β+,e-:
6.134e-14 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 9.333e-15
[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/Fr-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/Fr-223 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/Fr-223 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/Fr-223 Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
7.12248e-05 |
9.447e+00 |
X-ray |
|
2.88429e-03 |
4.833e-02 |
X-ray |
|
1.21973e-02 |
1.259e-02 |
X-ray |
|
1.23447e-02 |
1.107e-01 |
X-ray |
|
1.48529e-02 |
2.249e-02 |
X-ray |
|
1.53013e-02 |
8.173e-02 |
X-ray |
|
1.79232e-02 |
1.780e-02 |
X-ray |
|
2.02700e-02 |
1.590e-02 |
Gamma |
|
4.98000e-02 |
2.790e-02 |
Gamma |
|
5.00940e-02 |
3.390e-01 |
Gamma |
|
7.96510e-02 |
8.700e-02 |
Gamma |
|
8.57602e-02 |
1.735e-02 |
X-ray |
|
8.88641e-02 |
2.833e-02 |
X-ray |
|
2.34750e-01 |
3.000e-02 |
Gamma |
|
2.43589e-01 |
1.694e-02 |
Beta |
|
2.92462e-01 |
1.006e-01 |
Beta |
|
3.50359e-01 |
1.494e-01 |
Beta |
|
3.61557e-01 |
6.974e-01 |
Beta |
|
2.56225e-05 |
2.600e+00 |
Auger electron |
|
1.20503e-04 |
2.627e+00 |
Auger electron |
|
1.35428e-04 |
1.151e-02 |
Auger electron |
|
1.81380e-04 |
1.480e+00 |
Auger electron |
|
4.71585e-04 |
3.795e-01 |
Auger electron |
|
1.03800e-03 |
1.480e-02 |
Conversion electron |
|
1.33740e-03 |
1.408e-01 |
Auger electron |
|
1.71000e-03 |
3.095e-02 |
Conversion electron |
|
2.21579e-03 |
8.354e-01 |
Auger electron |
|
2.58631e-03 |
1.341e-01 |
Auger electron |
|
4.81400e-03 |
4.481e-02 |
Conversion electron |
|
9.35847e-03 |
2.188e-01 |
Auger electron |
|
1.03680e-02 |
1.937e-02 |
Conversion electron |
|
1.05480e-02 |
3.944e-02 |
Conversion electron |
|
1.12200e-02 |
9.877e-02 |
Conversion electron |
|
1.22881e-02 |
1.060e-01 |
Auger electron |
|
1.43240e-02 |
9.641e-02 |
Conversion electron |
|
1.52521e-02 |
1.217e-02 |
Auger electron |
|
1.64963e-02 |
2.399e-02 |
Conversion electron |
|
2.60063e-02 |
6.191e-02 |
Conversion electron |
|
2.97800e-02 |
2.087e-02 |
Conversion electron |
|
3.08620e-02 |
6.328e-02 |
Conversion electron |
|
3.15340e-02 |
5.606e-02 |
Conversion electron |
|
3.46380e-02 |
6.207e-02 |
Conversion electron |
|
4.63203e-02 |
4.458e-02 |
Conversion electron |
|
5.00940e-02 |
1.469e-02 |
Conversion electron |
|
1.00580e-01 |
1.705e-02 |
Conversion electron |
|
1.30430e-01 |
3.616e-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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