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Radionuclide Dosimetric Data Sheets
Francium-227
Summary data
General
Classification
Isotope: Fr-227
Atomic number (Z): 87
Mass number (A): 227
Neutron number (N): 140
Radioactive decay
Decay modes: β-
Half-life: 2.47 [m]
Decay constant: 4.6771e-03 [1/s]
Daughters: Ra-227 (100.0%)
Radioactive daughters: Ra-227
Dosimetric constants
Mean alpha energy: 0.0 [MeV]
Mean electron energy: 0.79666 [MeV]
Mean photon energy: 0.44993 [MeV]
Air kerma rate constant, Γ10: 2.478e-17 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 2.478e-17 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 1.276e-13 [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-:
1.276e-13 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 7.209e-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/Fr-227 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-227 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-227 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-227 Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
7.12226e-05 |
9.284e+00 |
X-ray |
|
2.88606e-03 |
4.721e-02 |
X-ray |
|
1.21973e-02 |
1.247e-02 |
X-ray |
|
1.23447e-02 |
1.097e-01 |
X-ray |
|
1.48529e-02 |
2.227e-02 |
X-ray |
|
1.53013e-02 |
8.729e-02 |
X-ray |
|
1.79232e-02 |
1.901e-02 |
X-ray |
|
6.42670e-02 |
1.446e-01 |
Gamma |
|
8.57602e-02 |
9.230e-02 |
X-ray |
|
8.83000e-02 |
1.106e-02 |
Gamma |
|
8.88641e-02 |
1.507e-01 |
X-ray |
|
9.00350e-02 |
3.871e-01 |
Gamma |
|
9.98380e-02 |
1.717e-02 |
X-ray |
|
1.00100e-01 |
2.686e-02 |
Gamma |
|
1.00546e-01 |
3.341e-02 |
X-ray |
|
1.01894e-01 |
3.555e-02 |
Gamma |
|
1.20709e-01 |
1.390e-02 |
Gamma |
|
1.35525e-01 |
1.027e-02 |
Gamma |
|
1.63563e-01 |
1.564e-02 |
Gamma |
|
1.75867e-01 |
1.027e-02 |
Gamma |
|
2.04300e-01 |
2.923e-02 |
Gamma |
|
3.69669e-01 |
3.160e-02 |
Gamma |
|
3.81556e-01 |
2.007e-02 |
Gamma |
|
3.84348e-01 |
1.801e-02 |
Gamma |
|
3.91570e-01 |
2.599e-02 |
Gamma |
|
4.33824e-01 |
5.056e-02 |
Gamma |
|
5.14800e-01 |
1.896e-02 |
Gamma |
|
5.55150e-01 |
2.986e-02 |
Gamma |
|
5.85804e-01 |
2.955e-01 |
Gamma |
|
3.27553e-01 |
2.184e-02 |
Beta |
|
6.38720e-01 |
5.161e-01 |
Beta |
|
7.00749e-01 |
7.047e-02 |
Beta |
|
7.58097e-01 |
1.290e-02 |
Beta |
|
7.94364e-01 |
2.184e-02 |
Beta |
|
8.50596e-01 |
2.978e-02 |
Beta |
|
8.67384e-01 |
7.940e-02 |
Beta |
|
8.80164e-01 |
1.985e-01 |
Beta |
|
2.56376e-05 |
2.557e+00 |
Auger electron |
|
1.20657e-04 |
2.579e+00 |
Auger electron |
|
1.35438e-04 |
1.132e-02 |
Auger electron |
|
1.81461e-04 |
1.458e+00 |
Auger electron |
|
4.72476e-04 |
3.832e-01 |
Auger electron |
|
1.42330e-03 |
1.059e-01 |
Auger electron |
|
2.21851e-03 |
8.165e-01 |
Auger electron |
|
2.59100e-03 |
1.314e-01 |
Auger electron |
|
8.12630e-03 |
1.173e-02 |
Conversion electron |
|
9.35179e-03 |
2.167e-01 |
Auger electron |
|
1.22793e-02 |
1.050e-01 |
Auger electron |
|
1.52391e-02 |
1.205e-02 |
Auger electron |
|
1.63890e-02 |
1.098e-01 |
Conversion electron |
|
3.09600e-02 |
2.742e-02 |
Conversion electron |
|
4.50350e-02 |
1.613e-02 |
Conversion electron |
|
4.55250e-02 |
9.963e-02 |
Conversion electron |
|
4.57070e-02 |
1.163e-02 |
Conversion electron |
|
4.86290e-02 |
8.411e-02 |
Conversion electron |
|
4.88110e-02 |
1.204e-02 |
Conversion electron |
|
6.03113e-02 |
5.084e-02 |
Conversion electron |
|
6.40850e-02 |
1.710e-02 |
Conversion electron |
|
7.08030e-02 |
2.084e-02 |
Conversion electron |
|
7.14750e-02 |
1.156e-02 |
Conversion electron |
|
7.45790e-02 |
1.096e-02 |
Conversion electron |
|
8.62613e-02 |
1.053e-02 |
Conversion electron |
|
9.99800e-02 |
4.072e-02 |
Conversion electron |
|
1.01477e-01 |
1.832e-02 |
Conversion electron |
|
2.65349e-01 |
1.098e-02 |
Conversion electron |
|
3.29504e-01 |
1.142e-02 |
Conversion electron |
|
4.81484e-01 |
2.996e-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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