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Radionuclide Dosimetric Data Sheets

Polonium-206

Summary data

General

Classification

Isotope:  Po-206
Atomic number (Z):  84
Mass number (A):  206
Neutron number (N):  122

Radioactive decay

Decay modes:  α, Electron capture
Half-life:  8.8 [d]
Decay constant:  9.1165e-07 [1/s]
Daughters:  Bi-206 (94.5%), Pb-202 (5.45%)
Radioactive daughters:  Bi-206, Pb-202

Dosimetric constants

Mean alpha energy:  0.2902 [MeV]
Mean electron energy:  0.1655 [MeV]
Mean photon energy:  1.19277 [MeV]
Air kerma rate constant, Γ10:  7.028e-17 [Gy·m2/Bq·s]
Air kerma coefficient, Kair:  7.028e-17 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or electrons), Δwp:  7.301e-14 [Gy·kg/Bq·s]
Equilibrium dose constant for alphas, Δα:  4.650e-14 [Gy·kg/Bq·s]
Equilibrium dose constant for betas/electrons, Δβ-,β+,e-:  2.652e-14 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp:  1.911e-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/Po-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/Po-206 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/Po-206 Summary Spectrum.csv

 

Energy [MeV]

Yield [#/nt] if > 0.01

Radiation type

3.24763e-05

3.498e+01

X-ray

2.47684e-03

1.277e-01

X-ray

9.45109e-03

1.722e-02

X-ray

1.07270e-02

3.012e-02

X-ray

1.08390e-02

2.653e-01

X-ray

1.29844e-02

5.151e-02

X-ray

1.30700e-02

2.204e-01

X-ray

1.53031e-02

4.552e-02

X-ray

5.99080e-02

1.225e-02

Gamma

7.50642e-02

2.771e-01

X-ray

7.74071e-02

4.634e-01

X-ray

8.71393e-02

5.182e-02

X-ray

8.76651e-02

1.004e-01

X-ray

9.00323e-02

1.243e-02

X-ray

9.01629e-02

2.448e-02

X-ray

2.86410e-01

2.383e-01

Gamma

3.11560e-01

4.243e-02

Gamma

3.38440e-01

1.917e-01

Gamma

4.63380e-01

1.793e-02

Gamma

5.11360e-01

2.405e-01

Gamma

5.22470e-01

1.573e-01

Gamma

5.54640e-01

1.557e-02

Gamma

5.79780e-01

1.057e-02

Gamma

6.77710e-01

1.473e-02

Gamma

8.07380e-01

2.269e-01

Gamma

8.18230e-01

1.044e-02

Gamma

8.60930e-01

3.540e-02

Gamma

9.80230e-01

7.080e-02

Gamma

1.00715e+00

3.063e-02

Gamma

1.03226e+00

3.290e-01

Gamma

4.07424e-05

8.324e+00

Auger electron

9.19631e-05

1.099e+01

Auger electron

1.18687e-04

1.732e-02

Auger electron

1.75597e-04

5.979e+00

Auger electron

4.55125e-04

1.932e+00

Auger electron

1.11820e-03

2.631e-01

Auger electron

1.98411e-03

2.904e+00

Auger electron

2.27899e-03

3.896e-01

Auger electron

2.70477e-03

2.038e-02

Auger electron

7.66910e-03

6.845e-01

Conversion electron

8.32218e-03

6.794e-01

Auger electron

1.07881e-02

3.058e-01

Auger electron

1.08360e-02

2.230e-01

Conversion electron

1.32832e-02

3.288e-02

Auger electron

4.41400e-02

3.465e-01

Conversion electron

4.64830e-02

3.200e-01

Conversion electron

5.67411e-02

1.789e-01

Conversion electron

5.99080e-02

5.596e-02

Conversion electron

6.03003e-02

2.296e-02

Auger electron

7.26460e-02

1.262e-02

Auger electron

1.95578e-01

1.080e-01

Conversion electron

2.20728e-01

1.502e-02

Conversion electron

2.47608e-01

5.552e-02

Conversion electron

2.70034e-01

1.685e-02

Conversion electron

4.20528e-01

2.268e-02

Conversion electron

4.31638e-01

1.398e-02

Conversion electron

5.22301e+00

5.450e-02

Alpha

1.03493e-01

5.450e-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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