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Radionuclide Dosimetric Data Sheets
Lead-202
Summary data
General
Classification
Isotope: Pb-202
Atomic number (Z): 82
Mass number (A): 202
Neutron number (N): 120
Radioactive decay
Decay modes: α, Electron capture
Half-life: 52500.0 [y]
Decay constant: 4.1838e-13 [1/s]
Daughters: Tl-202 (99.0%), Hg-198 (1.0%)
Radioactive daughters: Tl-202
Dosimetric constants
Mean alpha energy: 0.0259 [MeV]
Mean electron energy: 0.00614 [MeV]
Mean photon energy: 0.00249 [MeV]
Air kerma rate constant, Γ10: 1.058e-17 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 1.058e-17 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 5.133e-15 [Gy·kg/Bq·s]
Equilibrium dose constant for alphas, Δα: 4.150e-15
[Gy·kg/Bq·s]
Equilibrium dose constant for betas/electrons, Δβ-,β+,e-:
9.837e-16 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 3.989e-16
[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-202 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-202 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/Pb-202 Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
2.07162e-05 |
1.073e+01 |
X-ray |
|
2.29156e-03 |
3.704e-02 |
X-ray |
|
1.01663e-02 |
1.606e-02 |
X-ray |
|
1.02661e-02 |
1.414e-01 |
X-ray |
|
1.22749e-02 |
2.695e-02 |
X-ray |
|
4.28402e-05 |
2.370e+00 |
Auger electron |
|
7.47350e-05 |
3.501e+00 |
Auger electron |
|
1.72443e-04 |
1.846e+00 |
Auger electron |
|
3.81965e-04 |
4.312e-01 |
Auger electron |
|
7.22326e-04 |
2.032e-02 |
Auger electron |
|
1.85167e-03 |
9.697e-01 |
Auger electron |
|
2.09836e-03 |
1.151e-01 |
Auger electron |
|
7.33672e-03 |
2.696e-01 |
Auger electron |
|
9.58576e-03 |
1.162e-01 |
Auger electron |
|
1.18406e-02 |
1.200e-02 |
Auger electron |
|
2.54652e+00 |
1.000e-02 |
Alpha |
|
5.14783e-02 |
1.000e-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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