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Radionuclide Dosimetric Data Sheets

Bismuth-207

Summary data

General

Classification

Isotope:  Bi-207
Atomic number (Z):  83
Mass number (A):  207
Neutron number (N):  124

Radioactive decay

Decay modes:  β+, Electron capture
Half-life:  32.9 [y]
Decay constant:  6.6763e-10 [1/s]
Daughters:  Pb-207 (100.0%)
Radioactive daughters:  None

Dosimetric constants

Mean alpha energy:  0.0 [MeV]
Mean electron energy:  0.11929 [MeV]
Mean photon energy:  1.53703 [MeV]
Air kerma rate constant, Γ10:  6.934e-17 [Gy·m2/Bq·s]
Air kerma coefficient, Kair:  6.935e-17 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or electrons), Δwp:  1.911e-14 [Gy·kg/Bq·s]
Equilibrium dose constant for alphas, Δα:  0.000e+00 [Gy·kg/Bq·s]
Equilibrium dose constant for betas/electrons, Δβ-,β+,e-:  1.911e-14 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp:  2.463e-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/Bi-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/Bi-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/Bi-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/Bi-207 Summary Spectrum.csv

 

Energy [MeV]

Yield [#/nt] if > 0.01

Radiation type

2.66192e-05

1.412e+01

X-ray

2.37990e-03

5.292e-02

X-ray

1.04453e-02

1.641e-02

X-ray

1.05510e-02

1.444e-01

X-ray

1.26275e-02

2.779e-02

X-ray

1.26563e-02

8.449e-02

X-ray

1.48158e-02

1.725e-02

X-ray

7.30390e-02

2.180e-01

X-ray

7.52501e-02

3.662e-01

X-ray

8.47407e-02

4.079e-02

X-ray

8.52354e-02

7.901e-02

X-ray

8.76558e-02

1.912e-02

X-ray

5.69698e-01

9.776e-01

Gamma

1.06366e+00

7.460e-01

Gamma

1.77023e+00

6.870e-02

Gamma

4.21672e-05

3.180e+00

Auger electron

8.25283e-05

4.568e+00

Auger electron

1.73916e-04

2.409e+00

Auger electron

4.25036e-04

5.511e-01

Auger electron

8.99994e-04

2.134e-01

Auger electron

1.91031e-03

1.278e+00

Auger electron

2.17109e-03

1.593e-01

Auger electron

8.04420e-03

3.651e-01

Auger electron

1.04213e-02

1.615e-01

Auger electron

1.28274e-02

1.712e-02

Auger electron

5.87487e-02

1.847e-02

Auger electron

7.07077e-02

1.010e-02

Auger electron

4.81408e-01

1.562e-02

Conversion electron

9.75366e-01

7.287e-02

Conversion electron

1.04781e+00

1.436e-02

Conversion electron

 

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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