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Radionuclide Dosimetric Data Sheets
Radon-207
Summary data
General
Classification
Isotope: Rn-207
Atomic number (Z): 86
Mass number (A): 207
Neutron number (N): 121
Radioactive decay
Decay modes: α, β+, Electron capture
Half-life: 9.25 [m]
Decay constant: 1.2489e-03 [1/s]
Daughters: At-207 (79.0%), Po-203 (21.0%)
Radioactive daughters: At-207, Po-203
Dosimetric constants
Mean alpha energy: 1.3126 [MeV]
Mean electron energy: 0.21973 [MeV]
Mean photon energy: 0.98536 [MeV]
Air kerma rate constant, Γ10: 4.027e-17 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 4.540e-17 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 2.455e-13 [Gy·kg/Bq·s]
Equilibrium dose constant for alphas, Δα: 2.103e-13
[Gy·kg/Bq·s]
Equilibrium dose constant for betas/electrons, Δβ-,β+,e-:
3.520e-14 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 1.579e-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/Rn-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/Rn-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/Rn-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/Rn-207 Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
4.42780e-05 |
9.202e+00 |
X-ray |
|
2.62499e-03 |
4.113e-02 |
X-ray |
|
1.13036e-02 |
1.238e-02 |
X-ray |
|
1.14288e-02 |
1.090e-01 |
X-ray |
|
1.37157e-02 |
2.156e-02 |
X-ray |
|
1.39286e-02 |
7.214e-02 |
X-ray |
|
1.63129e-02 |
1.523e-02 |
X-ray |
|
7.92282e-02 |
1.751e-01 |
X-ray |
|
8.18531e-02 |
2.901e-01 |
X-ray |
|
9.20763e-02 |
3.269e-02 |
X-ray |
|
9.26695e-02 |
6.343e-02 |
X-ray |
|
9.53262e-02 |
1.568e-02 |
X-ray |
|
3.29450e-01 |
3.024e-02 |
Gamma |
|
3.44530e-01 |
4.582e-01 |
Gamma |
|
3.67600e-01 |
2.520e-02 |
Gamma |
|
4.02680e-01 |
1.191e-01 |
Gamma |
|
5.11000e-01 |
2.650e-01 |
Annihilation photon |
|
5.53200e-01 |
1.191e-02 |
Gamma |
|
6.28600e-01 |
1.100e-02 |
Gamma |
|
6.31600e-01 |
2.932e-02 |
Gamma |
|
6.43400e-01 |
1.237e-02 |
Gamma |
|
6.43400e-01 |
1.237e-02 |
Gamma |
|
6.47200e-01 |
1.787e-02 |
Gamma |
|
6.74000e-01 |
4.124e-02 |
Gamma |
|
6.74000e-01 |
8.248e-02 |
Gamma |
|
6.85800e-01 |
1.237e-02 |
Gamma |
|
6.97500e-01 |
2.383e-02 |
Gamma |
|
7.47150e-01 |
1.420e-01 |
Gamma |
|
7.75300e-01 |
2.062e-02 |
Gamma |
|
8.53400e-01 |
2.337e-02 |
Gamma |
|
8.92700e-01 |
1.008e-02 |
Gamma |
|
9.08600e-01 |
1.375e-02 |
Gamma |
|
9.73350e-01 |
2.520e-02 |
Gamma |
|
9.99200e-01 |
1.191e-02 |
Gamma |
|
1.27899e+00 |
4.847e-02 |
Positron |
|
1.31155e+00 |
2.036e-02 |
Positron |
|
1.45867e+00 |
3.781e-02 |
Positron |
|
3.80366e-05 |
2.281e+00 |
Auger electron |
|
1.04844e-04 |
2.793e+00 |
Auger electron |
|
1.76534e-04 |
1.519e+00 |
Auger electron |
|
4.46669e-04 |
3.535e-01 |
Auger electron |
|
1.18220e-03 |
1.126e-01 |
Auger electron |
|
2.06576e-03 |
8.327e-01 |
Auger electron |
|
2.37669e-03 |
1.196e-01 |
Auger electron |
|
8.66116e-03 |
2.389e-01 |
Auger electron |
|
1.13017e-02 |
1.108e-01 |
Auger electron |
|
1.39710e-02 |
1.222e-02 |
Auger electron |
|
6.34792e-02 |
1.391e-02 |
Auger electron |
|
2.33382e-01 |
1.112e-02 |
Conversion electron |
|
2.48462e-01 |
3.573e-02 |
Conversion electron |
|
3.06612e-01 |
2.549e-02 |
Conversion electron |
|
6.13023e+00 |
2.084e-01 |
Alpha |
|
1.20871e-01 |
2.084e-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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