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Radionuclide Dosimetric Data Sheets
Bismuth-211
Summary data
General
Classification
Isotope: Bi-211
Atomic number (Z): 83
Mass number (A): 211
Neutron number (N): 128
Radioactive decay
Decay modes: α, β-
Half-life: 2.14 [m]
Decay constant: 5.3983e-03 [1/s]
Daughters: Tl-207 (99.7%), Po-211 (0.276%)
Radioactive daughters: Tl-207, Po-211
Dosimetric constants
Mean alpha energy: 6.6756 [MeV]
Mean electron energy: 0.01003 [MeV]
Mean photon energy: 0.04726 [MeV]
Air kerma rate constant, Γ10: 2.207e-18 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 2.207e-18 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 1.071e-12 [Gy·kg/Bq·s]
Equilibrium dose constant for alphas, Δα: 1.070e-12
[Gy·kg/Bq·s]
Equilibrium dose constant for betas/electrons, Δβ-,β+,e-:
1.607e-15 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 7.572e-15
[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-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/Bi-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/Bi-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/Bi-211 Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
2.07377e-05 |
4.174e-01 |
X-ray |
|
7.31380e-02 |
1.283e-02 |
X-ray |
|
3.51060e-01 |
1.288e-01 |
Gamma |
|
4.30136e-05 |
9.162e-02 |
Auger electron |
|
7.56897e-05 |
1.368e-01 |
Auger electron |
|
1.74463e-04 |
7.169e-02 |
Auger electron |
|
4.16877e-04 |
1.554e-02 |
Auger electron |
|
1.85875e-03 |
3.784e-02 |
Auger electron |
|
7.84069e-03 |
1.133e-02 |
Auger electron |
|
2.65262e-01 |
2.702e-02 |
Conversion electron |
|
6.27864e+00 |
1.619e-01 |
Alpha |
|
6.62304e+00 |
8.354e-01 |
Alpha |
|
1.21405e-01 |
1.619e-01 |
Alpha recoil |
|
1.28065e-01 |
8.354e-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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