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Radionuclide Dosimetric Data Sheets
Polonium-207
Summary data
General
Classification
Isotope: Po-207
Atomic number (Z): 84
Mass number (A): 207
Neutron number (N): 123
Radioactive decay
Decay modes: α, β+, Electron capture
Half-life: 5.8 [h]
Decay constant: 3.3197e-05 [1/s]
Daughters: Bi-207 (100.0%), Pb-203 (0.021%)
Radioactive daughters: Bi-207, Pb-203
Dosimetric constants
Mean alpha energy: 0.001 [MeV]
Mean electron energy: 0.04896 [MeV]
Mean photon energy: 1.28466 [MeV]
Air kerma rate constant, Γ10: 5.953e-17 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 5.974e-17 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 8.004e-15 [Gy·kg/Bq·s]
Equilibrium dose constant for alphas, Δα: 1.602e-16
[Gy·kg/Bq·s]
Equilibrium dose constant for betas/electrons, Δβ-,β+,e-:
7.844e-15 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 2.058e-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/Po-207 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/Po-207 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/Po-207 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/Po-207 Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
3.24797e-05 |
1.332e+01 |
X-ray |
|
2.46007e-03 |
5.338e-02 |
X-ray |
|
1.07270e-02 |
1.673e-02 |
X-ray |
|
1.08390e-02 |
1.473e-01 |
X-ray |
|
1.29844e-02 |
2.860e-02 |
X-ray |
|
1.30700e-02 |
9.329e-02 |
X-ray |
|
1.53031e-02 |
1.926e-02 |
X-ray |
|
7.50642e-02 |
2.453e-01 |
X-ray |
|
7.74071e-02 |
4.102e-01 |
X-ray |
|
8.71393e-02 |
4.586e-02 |
X-ray |
|
8.76651e-02 |
8.889e-02 |
X-ray |
|
9.00323e-02 |
1.100e-02 |
X-ray |
|
9.01629e-02 |
2.167e-02 |
X-ray |
|
2.22030e-01 |
1.151e-02 |
Gamma |
|
2.49600e-01 |
1.597e-02 |
Gamma |
|
3.45290e-01 |
2.010e-02 |
Gamma |
|
3.69510e-01 |
1.735e-02 |
Gamma |
|
4.05750e-01 |
9.670e-02 |
Gamma |
|
5.11000e-01 |
1.040e-02 |
Annihilation photon |
|
6.29850e-01 |
1.340e-02 |
Gamma |
|
6.87560e-01 |
1.821e-02 |
Gamma |
|
7.42640e-01 |
2.824e-01 |
Gamma |
|
9.11790e-01 |
1.695e-01 |
Gamma |
|
9.47900e-01 |
1.168e-02 |
Gamma |
|
9.92330e-01 |
5.926e-01 |
Gamma |
|
1.14829e+00 |
5.720e-02 |
Gamma |
|
1.37244e+00 |
1.218e-02 |
Gamma |
|
2.06017e+00 |
1.323e-02 |
Gamma |
|
4.07260e-05 |
3.103e+00 |
Auger electron |
|
8.94709e-05 |
4.238e+00 |
Auger electron |
|
1.73668e-04 |
2.257e+00 |
Auger electron |
|
4.26161e-04 |
5.123e-01 |
Auger electron |
|
1.01942e-03 |
1.662e-01 |
Auger electron |
|
1.96163e-03 |
1.214e+00 |
Auger electron |
|
2.23799e-03 |
1.594e-01 |
Auger electron |
|
8.24084e-03 |
3.540e-01 |
Auger electron |
|
9.12201e-03 |
1.065e-02 |
Conversion electron |
|
1.07025e-02 |
1.592e-01 |
Auger electron |
|
1.31919e-02 |
1.709e-02 |
Auger electron |
|
6.03003e-02 |
2.032e-02 |
Auger electron |
|
7.26460e-02 |
1.117e-02 |
Auger electron |
|
1.58768e-01 |
1.062e-02 |
Conversion electron |
|
3.14918e-01 |
1.717e-02 |
Conversion electron |
|
9.01498e-01 |
1.013e-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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