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Radionuclide Dosimetric Data Sheets
Bismuth-208
Summary data
General
Classification
Isotope: Bi-208
Atomic number (Z): 83
Mass number (A): 208
Neutron number (N): 125
Radioactive decay
Decay modes: Electron capture
Half-life: 368000.0 [y]
Decay constant: 5.9687e-14 [1/s]
Daughters: Pb-208 (100.0%)
Radioactive daughters: None
Dosimetric constants
Mean alpha energy: 0.0 [MeV]
Mean electron energy: 0.01437 [MeV]
Mean photon energy: 2.646 [MeV]
Air kerma rate constant, Γ10: 8.583e-17 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 8.583e-17 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 2.302e-15 [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-:
2.302e-15 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 4.239e-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-208 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-208 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/Bi-208 Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
2.66148e-05 |
1.290e+01 |
X-ray |
|
2.37878e-03 |
4.810e-02 |
X-ray |
|
1.04453e-02 |
1.503e-02 |
X-ray |
|
1.05510e-02 |
1.323e-01 |
X-ray |
|
1.26275e-02 |
2.547e-02 |
X-ray |
|
1.26563e-02 |
5.393e-02 |
X-ray |
|
1.27924e-02 |
1.063e-02 |
X-ray |
|
1.48158e-02 |
1.101e-02 |
X-ray |
|
7.30390e-02 |
1.231e-01 |
X-ray |
|
7.52501e-02 |
2.067e-01 |
X-ray |
|
8.47407e-02 |
2.302e-02 |
X-ray |
|
8.52354e-02 |
4.460e-02 |
X-ray |
|
8.76558e-02 |
1.079e-02 |
X-ray |
|
2.61000e+00 |
1.000e+00 |
Gamma |
|
4.21388e-05 |
2.912e+00 |
Auger electron |
|
8.26696e-05 |
4.168e+00 |
Auger electron |
|
1.73810e-04 |
2.196e+00 |
Auger electron |
|
4.24467e-04 |
5.175e-01 |
Auger electron |
|
8.37809e-04 |
2.422e-01 |
Auger electron |
|
1.90855e-03 |
1.162e+00 |
Auger electron |
|
2.16931e-03 |
1.448e-01 |
Auger electron |
|
7.98583e-03 |
3.185e-01 |
Auger electron |
|
1.03611e-02 |
1.407e-01 |
Auger electron |
|
1.27661e-02 |
1.491e-02 |
Auger electron |
|
5.87487e-02 |
1.042e-02 |
Auger 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
MIRDsoft MIRDspecs version 20250101 (www.mirdsoft.org)
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