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Radionuclide Dosimetric Data Sheets
Bismuth-210m
Summary data
General
Classification
Isotope: Bi-210m
Atomic number (Z): 83
Mass number (A): 210
Neutron number (N): 127
Radioactive decay
Decay modes: α
Half-life: 3040000.0 [y]
Decay constant: 7.2253e-15 [1/s]
Daughters: Tl-206 (100.0%)
Radioactive daughters: Tl-206
Dosimetric constants
Mean alpha energy: 5.0064 [MeV]
Mean electron energy: 0.0475 [MeV]
Mean photon energy: 0.2607 [MeV]
Air kerma rate constant, Γ10: 1.214e-17 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 1.214e-17 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 8.097e-13 [Gy·kg/Bq·s]
Equilibrium dose constant for alphas, Δα: 8.021e-13
[Gy·kg/Bq·s]
Equilibrium dose constant for betas/electrons, Δβ-,β+,e-:
7.610e-15 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 4.177e-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-210m 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-210m 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-210m Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
2.07407e-05 |
2.465e+00 |
X-ray |
|
1.02661e-02 |
2.397e-02 |
X-ray |
|
1.22523e-02 |
1.834e-02 |
X-ray |
|
7.10519e-02 |
3.910e-02 |
X-ray |
|
7.31380e-02 |
6.597e-02 |
X-ray |
|
8.28534e-02 |
1.417e-02 |
X-ray |
|
2.65600e-01 |
5.000e-01 |
Gamma |
|
3.04700e-01 |
2.750e-01 |
Gamma |
|
6.49700e-01 |
3.850e-02 |
Gamma |
|
4.30313e-05 |
5.411e-01 |
Auger electron |
|
7.57658e-05 |
8.080e-01 |
Auger electron |
|
1.74676e-04 |
4.242e-01 |
Auger electron |
|
4.19701e-04 |
9.228e-02 |
Auger electron |
|
9.63070e-04 |
2.529e-02 |
Auger electron |
|
1.86096e-03 |
2.227e-01 |
Auger electron |
|
2.10728e-03 |
2.624e-02 |
Auger electron |
|
7.89018e-03 |
6.673e-02 |
Auger electron |
|
1.01834e-02 |
2.905e-02 |
Auger electron |
|
1.79802e-01 |
4.302e-02 |
Conversion electron |
|
2.18902e-01 |
8.953e-02 |
Conversion electron |
|
2.50854e-01 |
1.483e-02 |
Conversion electron |
|
2.89370e-01 |
1.367e-02 |
Conversion electron |
|
4.57059e+00 |
3.899e-02 |
Alpha |
|
4.58531e+00 |
1.400e-02 |
Alpha |
|
4.90853e+00 |
3.949e-01 |
Alpha |
|
4.94718e+00 |
5.499e-01 |
Alpha |
|
8.88071e-02 |
3.899e-02 |
Alpha recoil |
|
8.90930e-02 |
1.400e-02 |
Alpha recoil |
|
9.53732e-02 |
3.949e-01 |
Alpha recoil |
|
9.61241e-02 |
5.499e-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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