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Radionuclide Dosimetric Data Sheets
Lead-202m
Summary data
General
Classification
Isotope: Pb-202m
Atomic number (Z): 82
Mass number (A): 202
Neutron number (N): 120
Radioactive decay
Decay modes: Electron capture, Internal transition
Half-life: 3.53 [h]
Decay constant: 5.4544e-05 [1/s]
Daughters: Pb-202 (90.5%), Tl-202 (9.5%)
Radioactive daughters: Pb-202, Tl-202
Dosimetric constants
Mean alpha energy: 0.0 [MeV]
Mean electron energy: 0.13209 [MeV]
Mean photon energy: 1.99254 [MeV]
Air kerma rate constant, Γ10: 8.009e-17 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 8.009e-17 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 2.116e-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-:
2.116e-14 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 3.192e-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/Pb-202m 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-202m 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-202m Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
2.07378e-05 |
1.749e+00 |
X-ray |
|
2.66365e-05 |
4.830e+00 |
X-ray |
|
2.38831e-03 |
1.798e-02 |
X-ray |
|
1.02661e-02 |
1.736e-02 |
X-ray |
|
1.05510e-02 |
3.774e-02 |
X-ray |
|
1.22523e-02 |
1.153e-02 |
X-ray |
|
1.26563e-02 |
5.592e-02 |
X-ray |
|
1.48158e-02 |
1.142e-02 |
X-ray |
|
7.10519e-02 |
2.965e-02 |
X-ray |
|
7.30390e-02 |
2.311e-02 |
X-ray |
|
7.31380e-02 |
5.002e-02 |
X-ray |
|
7.52501e-02 |
3.882e-02 |
X-ray |
|
8.28534e-02 |
1.074e-02 |
X-ray |
|
3.89940e-01 |
6.161e-02 |
Gamma |
|
4.22120e-01 |
8.561e-01 |
Gamma |
|
4.59720e-01 |
8.596e-02 |
Gamma |
|
4.90470e-01 |
9.142e-02 |
Gamma |
|
6.57490e-01 |
3.235e-01 |
Gamma |
|
7.86990e-01 |
4.978e-01 |
Gamma |
|
9.60700e-01 |
9.159e-01 |
Gamma |
|
4.22891e-05 |
1.085e+00 |
Auger electron |
|
4.30175e-05 |
3.842e-01 |
Auger electron |
|
7.57853e-05 |
5.732e-01 |
Auger electron |
|
8.26912e-05 |
1.564e+00 |
Auger electron |
|
1.74554e-04 |
3.006e-01 |
Auger electron |
|
1.74902e-04 |
8.329e-01 |
Auger electron |
|
4.18557e-04 |
6.568e-02 |
Auger electron |
|
4.38555e-04 |
1.862e-01 |
Auger electron |
|
8.99476e-04 |
2.097e-02 |
Auger electron |
|
1.27109e-03 |
3.911e-02 |
Auger electron |
|
1.85934e-03 |
1.581e-01 |
Auger electron |
|
1.92247e-03 |
4.323e-01 |
Auger electron |
|
2.10503e-03 |
1.861e-02 |
Auger electron |
|
2.18760e-03 |
5.418e-02 |
Auger electron |
|
7.85775e-03 |
4.690e-02 |
Auger electron |
|
8.34197e-03 |
1.251e-01 |
Auger electron |
|
1.01497e-02 |
2.041e-02 |
Auger electron |
|
1.07337e-02 |
5.563e-02 |
Auger electron |
|
1.13949e-01 |
1.252e-01 |
Conversion electron |
|
1.16160e-01 |
7.092e-02 |
Conversion electron |
|
1.26145e-01 |
6.510e-02 |
Conversion electron |
|
1.29200e-01 |
2.069e-02 |
Conversion electron |
|
3.04142e-01 |
1.032e-02 |
Conversion electron |
|
3.33830e-01 |
2.580e-02 |
Conversion electron |
|
6.98700e-01 |
4.513e-02 |
Conversion electron |
|
7.71143e-01 |
1.093e-02 |
Conversion electron |
|
7.71739e-01 |
1.971e-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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