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Radionuclide Dosimetric Data Sheets
Bismuth-212
Summary data
General
Classification
Isotope: Bi-212
Atomic number (Z): 83
Mass number (A): 212
Neutron number (N): 129
Radioactive decay
Decay modes: α, β-
Half-life: 60.55 [m]
Decay constant: 1.9079e-04 [1/s]
Daughters: Po-212 (64.1%), Tl-208 (35.9%)
Radioactive daughters: Po-212, Tl-208
Dosimetric constants
Mean alpha energy: 2.2163 [MeV]
Mean electron energy: 0.50456 [MeV]
Mean photon energy: 0.10376 [MeV]
Air kerma rate constant, Γ10: 7.052e-18 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 7.052e-18 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 4.359e-13 [Gy·kg/Bq·s]
Equilibrium dose constant for alphas, Δα: 3.551e-13
[Gy·kg/Bq·s]
Equilibrium dose constant for betas/electrons, Δβ-,β+,e-:
8.084e-14 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 1.662e-14
[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-212 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-212 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-212 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-212 Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
2.07247e-05 |
4.027e+00 |
X-ray |
|
3.84122e-05 |
2.193e-02 |
X-ray |
|
2.30042e-03 |
1.394e-02 |
X-ray |
|
1.02661e-02 |
3.155e-02 |
X-ray |
|
3.98570e-02 |
1.064e-02 |
Gamma |
|
7.27330e-01 |
6.579e-02 |
Gamma |
|
7.85370e-01 |
1.102e-02 |
Gamma |
|
1.62050e+00 |
1.486e-02 |
Gamma |
|
1.91176e-01 |
1.870e-02 |
Beta |
|
2.29311e-01 |
1.435e-02 |
Beta |
|
5.31335e-01 |
4.362e-02 |
Beta |
|
8.32328e-01 |
5.545e-01 |
Beta |
|
4.29936e-05 |
8.917e-01 |
Auger electron |
|
7.66264e-05 |
1.316e+00 |
Auger electron |
|
1.74792e-04 |
6.870e-01 |
Auger electron |
|
4.29783e-04 |
1.625e-01 |
Auger electron |
|
7.25199e-04 |
1.393e-01 |
Auger electron |
|
1.85584e-03 |
3.568e-01 |
Auger electron |
|
2.10070e-03 |
4.179e-02 |
Auger electron |
|
7.92956e-03 |
8.709e-02 |
Auger electron |
|
1.02397e-02 |
3.796e-02 |
Auger electron |
|
2.45270e-02 |
1.809e-01 |
Conversion electron |
|
2.51110e-02 |
1.772e-02 |
Conversion electron |
|
3.69124e-02 |
4.682e-02 |
Conversion electron |
|
3.98570e-02 |
1.494e-02 |
Conversion electron |
|
6.05090e+00 |
2.508e-01 |
Alpha |
|
6.09001e+00 |
9.729e-02 |
Alpha |
|
1.16439e-01 |
2.508e-01 |
Alpha recoil |
|
1.17192e-01 |
9.729e-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
MIRDsoft MIRDspecs version 20250101 (www.mirdsoft.org)
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