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Radionuclide Dosimetric Data Sheets
Astatine-206
Summary data
General
Classification
Isotope: At-206
Atomic number (Z): 85
Mass number (A): 206
Neutron number (N): 121
Radioactive decay
Decay modes: α, β+, Electron capture
Half-life: 30.6 [m]
Decay constant: 3.7753e-04 [1/s]
Daughters: Po-206 (99.1%), Bi-202 (0.89%)
Radioactive daughters: Po-206, Bi-202
Dosimetric constants
Mean alpha energy: 0.0517 [MeV]
Mean electron energy: 0.33236 [MeV]
Mean photon energy: 2.48065 [MeV]
Air kerma rate constant, Γ10: 9.543e-17 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 1.025e-16 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 6.153e-14 [Gy·kg/Bq·s]
Equilibrium dose constant for alphas, Δα: 8.283e-15
[Gy·kg/Bq·s]
Equilibrium dose constant for betas/electrons, Δβ-,β+,e-:
5.325e-14 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 3.974e-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/At-206 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/At-206 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/At-206 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/At-206 Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
3.84107e-05 |
1.198e+01 |
X-ray |
|
2.54256e-03 |
5.064e-02 |
X-ray |
|
1.10135e-02 |
1.510e-02 |
X-ray |
|
1.11319e-02 |
1.329e-01 |
X-ray |
|
1.33474e-02 |
2.606e-02 |
X-ray |
|
1.34935e-02 |
8.538e-02 |
X-ray |
|
1.58015e-02 |
1.783e-02 |
X-ray |
|
6.17660e-02 |
1.308e-02 |
Gamma |
|
7.71271e-02 |
2.037e-01 |
X-ray |
|
7.96070e-02 |
3.390e-01 |
X-ray |
|
8.95836e-02 |
3.805e-02 |
X-ray |
|
9.01425e-02 |
7.384e-02 |
X-ray |
|
9.27190e-02 |
1.811e-02 |
X-ray |
|
1.97980e-01 |
1.562e-02 |
Gamma |
|
2.01840e-01 |
5.369e-02 |
Gamma |
|
2.33550e-01 |
3.124e-02 |
Gamma |
|
2.56530e-01 |
4.393e-02 |
Gamma |
|
2.68340e-01 |
1.269e-02 |
Gamma |
|
2.75590e-01 |
2.050e-02 |
Gamma |
|
2.78880e-01 |
2.636e-02 |
Gamma |
|
3.42510e-01 |
1.464e-02 |
Gamma |
|
3.86740e-01 |
2.636e-02 |
Gamma |
|
3.86740e-01 |
2.636e-02 |
Gamma |
|
3.95540e-01 |
4.813e-01 |
Gamma |
|
4.16410e-01 |
1.269e-02 |
Gamma |
|
4.44730e-01 |
1.239e-02 |
Gamma |
|
4.77100e-01 |
8.591e-01 |
Gamma |
|
5.11000e-01 |
3.658e-01 |
Annihilation photon |
|
5.27270e-01 |
2.929e-02 |
Gamma |
|
5.65550e-01 |
3.222e-02 |
Gamma |
|
6.14400e-01 |
1.635e-02 |
Gamma |
|
6.14400e-01 |
6.150e-02 |
Gamma |
|
7.00660e-01 |
9.762e-01 |
Gamma |
|
7.04660e-01 |
5.955e-02 |
Gamma |
|
7.33730e-01 |
1.015e-01 |
Gamma |
|
7.38030e-01 |
1.171e-02 |
Gamma |
|
7.96600e-01 |
1.171e-02 |
Gamma |
|
8.24220e-01 |
1.269e-02 |
Gamma |
|
8.38010e-01 |
2.538e-02 |
Gamma |
|
8.64300e-01 |
1.718e-02 |
Gamma |
|
8.68270e-01 |
7.615e-02 |
Gamma |
|
9.23120e-01 |
5.565e-02 |
Gamma |
|
9.39250e-01 |
1.952e-02 |
Gamma |
|
9.55200e-01 |
1.464e-02 |
Gamma |
|
9.60920e-01 |
1.367e-02 |
Gamma |
|
9.76320e-01 |
1.367e-02 |
Gamma |
|
1.00864e+00 |
1.757e-02 |
Gamma |
|
1.01382e+00 |
2.929e-02 |
Gamma |
|
1.04818e+00 |
2.245e-02 |
Gamma |
|
1.05938e+00 |
3.417e-02 |
Gamma |
|
1.12477e+00 |
1.855e-02 |
Gamma |
|
1.19686e+00 |
1.464e-02 |
Gamma |
|
1.25753e+00 |
1.171e-02 |
Gamma |
|
1.44608e+00 |
1.269e-02 |
Gamma |
|
1.63741e+00 |
1.171e-02 |
Gamma |
|
1.93807e+00 |
1.269e-02 |
Gamma |
|
1.17276e+00 |
1.187e-02 |
Positron |
|
1.42501e+00 |
9.028e-02 |
Positron |
|
1.42890e+00 |
1.158e-02 |
Positron |
|
1.48736e+00 |
1.178e-02 |
Positron |
|
1.60276e+00 |
4.808e-02 |
Positron |
|
3.94563e-05 |
2.864e+00 |
Auger electron |
|
9.72316e-05 |
3.728e+00 |
Auger electron |
|
1.74767e-04 |
2.006e+00 |
Auger electron |
|
4.35442e-04 |
4.709e-01 |
Auger electron |
|
1.06982e-03 |
1.640e-01 |
Auger electron |
|
2.01504e-03 |
1.085e+00 |
Auger electron |
|
2.30889e-03 |
1.494e-01 |
Auger electron |
|
8.46215e-03 |
3.071e-01 |
Auger electron |
|
9.21850e-03 |
1.336e-02 |
Conversion electron |
|
1.10139e-02 |
1.403e-01 |
Auger electron |
|
1.35948e-02 |
1.527e-02 |
Auger electron |
|
6.18768e-02 |
1.652e-02 |
Auger electron |
|
1.63106e-01 |
2.670e-02 |
Conversion electron |
|
3.02116e-01 |
1.763e-02 |
Conversion electron |
|
3.83676e-01 |
2.118e-02 |
Conversion electron |
|
6.07236e-01 |
1.115e-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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