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Radionuclide Dosimetric Data Sheets
Lead-212
Summary data
General
Classification
Isotope: Pb-212
Atomic number (Z): 82
Mass number (A): 212
Neutron number (N): 130
Radioactive decay
Decay modes: β-
Half-life: 10.64 [h]
Decay constant: 1.8096e-05 [1/s]
Daughters: Bi-212 (100.0%)
Radioactive daughters: Bi-212
Dosimetric constants
Mean alpha energy: 0.0 [MeV]
Mean electron energy: 0.17663 [MeV]
Mean photon energy: 0.14503 [MeV]
Air kerma rate constant, Γ10: 1.091e-17 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 1.091e-17 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 2.830e-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-:
2.830e-14 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 2.324e-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/Pb-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/Pb-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/Pb-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/Pb-212 Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
3.24801e-05 |
5.562e+00 |
X-ray |
|
2.45996e-03 |
2.232e-02 |
X-ray |
|
1.08390e-02 |
6.207e-02 |
X-ray |
|
1.29844e-02 |
1.205e-02 |
X-ray |
|
1.30700e-02 |
3.996e-02 |
X-ray |
|
7.50642e-02 |
1.060e-01 |
X-ray |
|
7.74071e-02 |
1.772e-01 |
X-ray |
|
8.71393e-02 |
1.982e-02 |
X-ray |
|
8.76651e-02 |
3.841e-02 |
X-ray |
|
2.38632e-01 |
4.330e-01 |
Gamma |
|
3.00087e-01 |
3.278e-02 |
Gamma |
|
4.22568e-02 |
5.172e-02 |
Beta |
|
9.48035e-02 |
8.252e-01 |
Beta |
|
1.73045e-01 |
1.230e-01 |
Beta |
|
4.07273e-05 |
1.295e+00 |
Auger electron |
|
8.93950e-05 |
1.770e+00 |
Auger electron |
|
1.73624e-04 |
9.423e-01 |
Auger electron |
|
4.25241e-04 |
2.125e-01 |
Auger electron |
|
1.03762e-03 |
6.526e-02 |
Auger electron |
|
1.96159e-03 |
5.075e-01 |
Auger electron |
|
2.23782e-03 |
6.665e-02 |
Auger electron |
|
8.23907e-03 |
1.491e-01 |
Auger electron |
|
1.07002e-02 |
6.704e-02 |
Auger electron |
|
2.43510e-02 |
3.477e-02 |
Conversion electron |
|
1.47800e-01 |
3.259e-01 |
Conversion electron |
|
2.09255e-01 |
1.315e-02 |
Conversion electron |
|
2.22256e-01 |
5.106e-02 |
Conversion electron |
|
2.35465e-01 |
1.326e-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
MIRDsoft MIRDspecs version 20250101 (www.mirdsoft.org)
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