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Radionuclide Dosimetric Data Sheets

Radon-211

Summary data

General

Classification

Isotope:  Rn-211
Atomic number (Z):  86
Mass number (A):  211
Neutron number (N):  125

Radioactive decay

Decay modes:  α, β+, Electron capture
Half-life:  14.6 [h]
Decay constant:  1.3188e-05 [1/s]
Daughters:  At-211 (72.6%), Po-207 (27.4%)
Radioactive daughters:  At-211, Po-207

Dosimetric constants

Mean alpha energy:  1.6204 [MeV]
Mean electron energy:  0.06627 [MeV]
Mean photon energy:  1.87269 [MeV]
Air kerma rate constant, Γ10:  7.886e-17 [Gy·m2/Bq·s]
Air kerma coefficient, Kair:  7.887e-17 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or electrons), Δwp:  2.702e-13 [Gy·kg/Bq·s]
Equilibrium dose constant for alphas, Δα:  2.596e-13 [Gy·kg/Bq·s]
Equilibrium dose constant for betas/electrons, Δβ-,β+,e-:  1.062e-14 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp:  3.000e-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-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/Rn-211 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-211 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-211 Summary Spectrum.csv

 

Energy [MeV]

Yield [#/nt] if > 0.01

Radiation type

3.84276e-05

1.947e+00

X-ray

4.42779e-05

1.069e+01

X-ray

2.62560e-03

4.761e-02

X-ray

1.11319e-02

1.853e-02

X-ray

1.13036e-02

1.392e-02

X-ray

1.14288e-02

1.225e-01

X-ray

1.34935e-02

2.351e-02

X-ray

1.37157e-02

2.423e-02

X-ray

1.39286e-02

8.095e-02

X-ray

1.63129e-02

1.709e-02

X-ray

7.92282e-02

1.782e-01

X-ray

8.18531e-02

2.952e-01

X-ray

9.20764e-02

3.326e-02

X-ray

9.26695e-02

6.454e-02

X-ray

9.53262e-02

1.595e-02

X-ray

1.68700e-01

6.718e-02

Gamma

2.50200e-01

5.996e-02

Gamma

3.70500e-01

1.353e-02

Gamma

4.16400e-01

3.472e-02

Gamma

4.42200e-01

2.299e-01

Gamma

6.74100e-01

4.508e-01

Gamma

6.78400e-01

2.885e-01

Gamma

8.53400e-01

4.599e-02

Gamma

8.66000e-01

7.890e-02

Gamma

9.34700e-01

3.652e-02

Gamma

9.46700e-01

4.959e-02

Gamma

9.47400e-01

1.623e-01

Gamma

9.92500e-01

1.353e-02

Gamma

1.12670e+00

2.209e-01

Gamma

1.18130e+00

1.443e-02

Gamma

1.36290e+00

3.246e-01

Gamma

1.53880e+00

4.689e-02

Gamma

3.80401e-05

2.652e+00

Auger electron

3.95726e-05

4.650e-01

Auger electron

9.73903e-05

6.066e-01

Auger electron

1.05034e-04

3.243e+00

Auger electron

1.75290e-04

3.299e-01

Auger electron

1.76679e-04

1.764e+00

Auger electron

4.44662e-04

7.696e-02

Auger electron

4.50569e-04

4.164e-01

Auger electron

1.14628e-03

1.503e-01

Auger electron

1.71322e-03

1.006e-02

Auger electron

2.02636e-03

1.745e-01

Auger electron

2.06631e-03

9.634e-01

Auger electron

2.32481e-03

2.418e-02

Auger electron

2.37770e-03

1.384e-01

Auger electron

8.67560e-03

5.085e-02

Auger electron

8.68158e-03

2.715e-01

Auger electron

1.12369e-02

2.330e-02

Auger electron

1.13245e-02

1.259e-01

Auger electron

1.39978e-02

1.390e-02

Auger electron

5.22030e-02

6.833e-02

Conversion electron

5.46830e-02

5.972e-02

Conversion electron

6.34792e-02

1.416e-02

Auger electron

6.52185e-02

3.466e-02

Conversion electron

6.85000e-02

1.104e-02

Conversion electron

7.26320e-02

3.087e-02

Conversion electron

9.57320e-02

1.471e-02

Conversion electron

1.51860e-01

1.820e-02

Conversion electron

1.54485e-01

1.102e-02

Conversion electron

5.78032e-01

1.906e-02

Conversion electron

5.78367e+00

1.731e-01

Alpha

5.85087e+00

9.341e-02

Alpha

1.11834e-01

1.731e-01

Alpha recoil

1.13134e-01

9.341e-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

 

 

 

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