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Radionuclide Dosimetric Data Sheets
Francium-212
Summary data
General
Classification
Isotope: Fr-212
Atomic number (Z): 87
Mass number (A): 212
Neutron number (N): 125
Radioactive decay
Decay modes: α, β+, Electron capture
Half-life: 20.0 [m]
Decay constant: 5.7762e-04 [1/s]
Daughters: Rn-212 (57.0%), At-208 (43.0%)
Radioactive daughters: Rn-212, At-208
Dosimetric constants
Mean alpha energy: 2.773 [MeV]
Mean electron energy: 0.12941 [MeV]
Mean photon energy: 1.14151 [MeV]
Air kerma rate constant, Γ10: 5.364e-17 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 5.545e-17 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 4.650e-13 [Gy·kg/Bq·s]
Equilibrium dose constant for alphas, Δα: 4.443e-13
[Gy·kg/Bq·s]
Equilibrium dose constant for betas/electrons, Δβ-,β+,e-:
2.073e-14 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 1.829e-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/Fr-212 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-212 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-212 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-212 Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
4.42725e-05 |
7.711e+00 |
X-ray |
|
5.00978e-05 |
9.537e+00 |
X-ray |
|
2.62542e-03 |
3.398e-02 |
X-ray |
|
2.71234e-03 |
4.454e-02 |
X-ray |
|
1.14288e-02 |
7.415e-02 |
X-ray |
|
1.15974e-02 |
1.234e-02 |
X-ray |
|
1.17297e-02 |
1.086e-01 |
X-ray |
|
1.34812e-02 |
1.196e-02 |
X-ray |
|
1.37157e-02 |
1.467e-02 |
X-ray |
|
1.39286e-02 |
2.970e-02 |
X-ray |
|
1.40745e-02 |
1.229e-02 |
X-ray |
|
1.40892e-02 |
2.168e-02 |
X-ray |
|
1.43744e-02 |
9.276e-02 |
X-ray |
|
1.68365e-02 |
1.979e-02 |
X-ray |
|
7.92282e-02 |
2.484e-02 |
X-ray |
|
8.13681e-02 |
1.416e-01 |
X-ray |
|
8.18531e-02 |
4.116e-02 |
X-ray |
|
8.41450e-02 |
2.335e-01 |
X-ray |
|
9.46165e-02 |
2.640e-02 |
X-ray |
|
9.52461e-02 |
5.130e-02 |
X-ray |
|
9.75000e-02 |
2.768e-02 |
Gamma |
|
9.79846e-02 |
1.276e-02 |
X-ray |
|
1.24250e-01 |
2.021e-02 |
Gamma |
|
1.38300e-01 |
7.749e-02 |
Gamma |
|
2.27720e-01 |
4.258e-01 |
Gamma |
|
3.09100e-01 |
1.022e-02 |
Gamma |
|
3.11500e-01 |
1.363e-02 |
Gamma |
|
5.11000e-01 |
9.350e-02 |
Annihilation photon |
|
5.32000e-01 |
2.810e-02 |
Gamma |
|
8.01900e-01 |
3.577e-02 |
Gamma |
|
1.04730e+00 |
7.238e-02 |
Gamma |
|
1.17840e+00 |
1.363e-02 |
Gamma |
|
1.18560e+00 |
1.405e-01 |
Gamma |
|
1.27480e+00 |
4.599e-01 |
Gamma |
|
1.10916e+00 |
2.048e-02 |
Positron |
|
1.17029e+00 |
1.991e-02 |
Positron |
|
3.68419e-05 |
2.456e+00 |
Auger electron |
|
3.80140e-05 |
1.922e+00 |
Auger electron |
|
1.05892e-04 |
2.337e+00 |
Auger electron |
|
1.13171e-04 |
2.814e+00 |
Auger electron |
|
1.77251e-04 |
1.262e+00 |
Auger electron |
|
1.80041e-04 |
1.551e+00 |
Auger electron |
|
4.56292e-04 |
3.756e-01 |
Auger electron |
|
4.69474e-04 |
3.164e-01 |
Auger electron |
|
1.00003e-03 |
2.414e-01 |
Auger electron |
|
1.34935e-03 |
1.026e-01 |
Auger electron |
|
2.06385e-03 |
6.853e-01 |
Auger electron |
|
2.12270e-03 |
8.531e-01 |
Auger electron |
|
2.37485e-03 |
9.815e-02 |
Auger electron |
|
2.45410e-03 |
1.276e-01 |
Auger electron |
|
6.02700e-03 |
1.947e-01 |
Conversion electron |
|
6.66000e-03 |
2.369e-02 |
Conversion electron |
|
8.75797e-03 |
1.687e-01 |
Auger electron |
|
8.96585e-03 |
2.416e-01 |
Auger electron |
|
1.14165e-02 |
7.836e-02 |
Auger electron |
|
1.17044e-02 |
1.138e-01 |
Auger electron |
|
1.44743e-02 |
1.274e-02 |
Auger electron |
|
2.01015e-02 |
5.364e-02 |
Conversion electron |
|
2.26270e-02 |
5.916e-02 |
Conversion electron |
|
2.35000e-02 |
1.787e-02 |
Conversion electron |
|
2.81820e-02 |
8.541e-02 |
Conversion electron |
|
3.67015e-02 |
1.576e-02 |
Conversion electron |
|
3.95360e-02 |
2.426e-02 |
Conversion electron |
|
5.42270e-02 |
2.486e-02 |
Conversion electron |
|
6.51076e-02 |
1.103e-02 |
Auger electron |
|
6.66270e-02 |
1.804e-02 |
Conversion electron |
|
1.06777e-01 |
1.387e-02 |
Conversion electron |
|
1.20904e-01 |
6.075e-02 |
Conversion electron |
|
1.23681e-01 |
4.006e-02 |
Conversion electron |
|
1.28956e-01 |
5.343e-02 |
Conversion electron |
|
1.34782e-01 |
2.865e-02 |
Conversion electron |
|
2.10324e-01 |
3.824e-02 |
Conversion electron |
|
2.13101e-01 |
1.983e-02 |
Conversion electron |
|
2.24202e-01 |
1.783e-02 |
Conversion electron |
|
6.26123e+00 |
1.598e-01 |
Alpha |
|
6.33588e+00 |
4.347e-02 |
Alpha |
|
6.34373e+00 |
1.321e-02 |
Alpha |
|
6.38314e+00 |
1.023e-01 |
Alpha |
|
6.40622e+00 |
9.377e-02 |
Alpha |
|
1.20487e-01 |
1.598e-01 |
Alpha recoil |
|
1.21923e-01 |
4.347e-02 |
Alpha recoil |
|
1.22074e-01 |
1.321e-02 |
Alpha recoil |
|
1.22832e-01 |
1.023e-01 |
Alpha recoil |
|
1.23277e-01 |
9.377e-02 |
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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