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Radionuclide Dosimetric Data Sheets
Astatine-207
Summary data
General
Classification
Isotope: At-207
Atomic number (Z): 85
Mass number (A): 207
Neutron number (N): 122
Radioactive decay
Decay modes: α, β+, Electron capture
Half-life: 1.8 [h]
Decay constant: 1.0697e-04 [1/s]
Daughters: Po-207 (91.4%), Bi-203 (8.6%)
Radioactive daughters: Po-207, Bi-203
Dosimetric constants
Mean alpha energy: 0.5049 [MeV]
Mean electron energy: 0.1298 [MeV]
Mean photon energy: 2.01359 [MeV]
Air kerma rate constant, Γ10: 8.529e-17 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 8.597e-17 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 1.017e-13 [Gy·kg/Bq·s]
Equilibrium dose constant for alphas, Δα: 8.089e-14
[Gy·kg/Bq·s]
Equilibrium dose constant for betas/electrons, Δβ-,β+,e-:
2.080e-14 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 3.226e-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-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/At-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/At-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/At-207 Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
3.84108e-05 |
1.606e+01 |
X-ray |
|
2.54219e-03 |
6.806e-02 |
X-ray |
|
9.68940e-03 |
1.171e-02 |
X-ray |
|
1.10135e-02 |
2.047e-02 |
X-ray |
|
1.11319e-02 |
1.802e-01 |
X-ray |
|
1.33474e-02 |
3.533e-02 |
X-ray |
|
1.34935e-02 |
1.157e-01 |
X-ray |
|
1.58015e-02 |
2.415e-02 |
X-ray |
|
7.71271e-02 |
2.674e-01 |
X-ray |
|
7.96070e-02 |
4.452e-01 |
X-ray |
|
8.95836e-02 |
4.997e-02 |
X-ray |
|
9.01425e-02 |
9.696e-02 |
X-ray |
|
9.25794e-02 |
1.205e-02 |
X-ray |
|
9.27189e-02 |
2.378e-02 |
X-ray |
|
1.67900e-01 |
1.002e-02 |
Gamma |
|
2.21270e-01 |
1.188e-02 |
Gamma |
|
3.00648e-01 |
1.277e-01 |
Gamma |
|
3.57153e-01 |
2.671e-02 |
Gamma |
|
4.56750e-01 |
1.780e-02 |
Gamma |
|
4.59690e-01 |
1.687e-02 |
Gamma |
|
4.67116e-01 |
7.122e-02 |
Gamma |
|
5.11000e-01 |
3.499e-02 |
Annihilation photon |
|
5.29790e-01 |
3.427e-02 |
Gamma |
|
5.83340e-01 |
2.181e-02 |
Gamma |
|
5.88333e-01 |
1.923e-01 |
Gamma |
|
6.17200e-01 |
1.803e-02 |
Gamma |
|
6.26770e-01 |
1.914e-02 |
Gamma |
|
6.37270e-01 |
2.493e-02 |
Gamma |
|
6.48095e-01 |
4.273e-02 |
Gamma |
|
6.58400e-01 |
6.410e-02 |
Gamma |
|
6.70410e-01 |
3.739e-02 |
Gamma |
|
6.75154e-01 |
6.766e-02 |
Gamma |
|
6.86000e-01 |
2.003e-02 |
Gamma |
|
6.93330e-01 |
2.582e-02 |
Gamma |
|
7.21140e-01 |
6.009e-02 |
Gamma |
|
8.14410e-01 |
4.451e-01 |
Gamma |
|
8.80920e-01 |
1.091e-02 |
Gamma |
|
9.07080e-01 |
6.632e-02 |
Gamma |
|
1.05422e+00 |
1.068e-02 |
Gamma |
|
1.07768e+00 |
1.959e-02 |
Gamma |
|
1.11520e+00 |
4.807e-02 |
Gamma |
|
1.17162e+00 |
1.242e-02 |
Gamma |
|
1.18826e+00 |
1.691e-02 |
Gamma |
|
1.22562e+00 |
1.175e-02 |
Gamma |
|
1.28308e+00 |
1.220e-02 |
Gamma |
|
1.39619e+00 |
1.415e-02 |
Gamma |
|
1.40986e+00 |
1.153e-02 |
Gamma |
|
1.54821e+00 |
1.162e-02 |
Gamma |
|
1.67650e+00 |
3.027e-02 |
Gamma |
|
1.71260e+00 |
1.326e-02 |
Gamma |
|
1.73076e+00 |
3.739e-02 |
Gamma |
|
2.71250e+00 |
1.220e-02 |
Gamma |
|
3.94546e-05 |
3.839e+00 |
Auger electron |
|
9.72106e-05 |
5.001e+00 |
Auger electron |
|
1.74735e-04 |
2.689e+00 |
Auger electron |
|
4.35110e-04 |
6.271e-01 |
Auger electron |
|
1.06928e-03 |
2.229e-01 |
Auger electron |
|
2.01432e-03 |
1.458e+00 |
Auger electron |
|
2.30760e-03 |
2.006e-01 |
Auger electron |
|
2.73738e-03 |
1.046e-02 |
Auger electron |
|
8.46231e-03 |
4.163e-01 |
Auger electron |
|
1.10141e-02 |
1.902e-01 |
Auger electron |
|
1.35950e-02 |
2.070e-02 |
Auger electron |
|
5.22530e-02 |
2.259e-02 |
Conversion electron |
|
5.47330e-02 |
1.974e-02 |
Conversion electron |
|
6.18768e-02 |
2.169e-02 |
Auger electron |
|
6.52685e-02 |
1.146e-02 |
Conversion electron |
|
7.44760e-02 |
2.174e-02 |
Conversion electron |
|
7.46184e-02 |
1.198e-02 |
Auger electron |
|
1.27846e-01 |
1.164e-02 |
Conversion electron |
|
2.07224e-01 |
1.823e-01 |
Conversion electron |
|
2.83730e-01 |
3.853e-02 |
Conversion electron |
|
2.97367e-01 |
1.171e-02 |
Conversion electron |
|
5.75748e+00 |
8.600e-02 |
Alpha |
|
1.13522e-01 |
8.600e-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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