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Radionuclide Dosimetric Data Sheets
Astatine-211
Summary data
General
Classification
Isotope: At-211
Atomic number (Z): 85
Mass number (A): 211
Neutron number (N): 126
Radioactive decay
Decay modes: α, Electron capture
Half-life: 7.214 [h]
Decay constant: 2.6690e-05 [1/s]
Daughters: Po-211 (58.2%), Bi-207 (41.8%)
Radioactive daughters: Po-211, Bi-207
Dosimetric constants
Mean alpha energy: 2.4998 [MeV]
Mean electron energy: 0.00594 [MeV]
Mean photon energy: 0.03667 [MeV]
Air kerma rate constant, Γ10: 8.244e-18 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 8.244e-18 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 4.015e-13 [Gy·kg/Bq·s]
Equilibrium dose constant for alphas, Δα: 4.005e-13
[Gy·kg/Bq·s]
Equilibrium dose constant for betas/electrons, Δβ-,β+,e-:
9.517e-16 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 5.875e-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/At-211 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-211 Summary 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-211 Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
3.84095e-05 |
7.112e+00 |
X-ray |
|
2.54189e-03 |
3.010e-02 |
X-ray |
|
1.11319e-02 |
7.920e-02 |
X-ray |
|
1.33474e-02 |
1.553e-02 |
X-ray |
|
1.34935e-02 |
4.735e-02 |
X-ray |
|
7.71271e-02 |
1.165e-01 |
X-ray |
|
7.96070e-02 |
1.940e-01 |
X-ray |
|
8.95836e-02 |
2.178e-02 |
X-ray |
|
9.01425e-02 |
4.225e-02 |
X-ray |
|
9.27190e-02 |
1.036e-02 |
X-ray |
|
3.94466e-05 |
1.701e+00 |
Auger electron |
|
9.73034e-05 |
2.214e+00 |
Auger electron |
|
1.74775e-04 |
1.190e+00 |
Auger electron |
|
4.36101e-04 |
2.798e-01 |
Auger electron |
|
1.03612e-03 |
1.113e-01 |
Auger electron |
|
2.01368e-03 |
6.448e-01 |
Auger electron |
|
2.30680e-03 |
8.866e-02 |
Auger electron |
|
8.45615e-03 |
1.818e-01 |
Auger electron |
|
1.10084e-02 |
8.303e-02 |
Auger electron |
|
5.86705e+00 |
4.179e-01 |
Alpha |
|
1.13447e-01 |
4.179e-01 |
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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