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Radionuclide Dosimetric Data Sheets
Lead-201m
Summary data
General
Classification
Isotope: Pb-201m
Atomic number (Z): 82
Mass number (A): 201
Neutron number (N): 119
Radioactive decay
Decay modes: Internal transition
Half-life: 61.0 [s]
Decay constant: 1.1363e-02 [1/s]
Daughters: Pb-201 (100.0%)
Radioactive daughters: Pb-201
Dosimetric constants
Mean alpha energy: 0.0 [MeV]
Mean electron energy: 0.26329 [MeV]
Mean photon energy: 0.36582 [MeV]
Air kerma rate constant, Γ10: 1.958e-17 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 1.958e-17 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 4.218e-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-:
4.218e-14 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 5.861e-14
[Gy·kg/Bq·s]
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-201m 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-201m Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
2.66201e-05 |
5.686e+00 |
X-ray |
|
2.37972e-03 |
2.139e-02 |
X-ray |
|
1.05510e-02 |
5.928e-02 |
X-ray |
|
1.26275e-02 |
1.141e-02 |
X-ray |
|
1.26563e-02 |
3.665e-02 |
X-ray |
|
7.30390e-02 |
8.739e-02 |
X-ray |
|
7.52501e-02 |
1.468e-01 |
X-ray |
|
8.47407e-02 |
1.635e-02 |
X-ray |
|
8.52354e-02 |
3.167e-02 |
X-ray |
|
6.29100e-01 |
5.422e-01 |
Gamma |
|
4.21721e-05 |
1.279e+00 |
Auger electron |
|
8.23519e-05 |
1.840e+00 |
Auger electron |
|
1.73840e-04 |
9.701e-01 |
Auger electron |
|
4.23115e-04 |
2.180e-01 |
Auger electron |
|
9.31292e-04 |
7.587e-02 |
Auger electron |
|
1.91038e-03 |
5.166e-01 |
Auger electron |
|
2.17090e-03 |
6.438e-02 |
Auger electron |
|
8.04380e-03 |
1.502e-01 |
Auger electron |
|
1.04199e-02 |
6.642e-02 |
Auger electron |
|
5.40810e-01 |
3.097e-01 |
Conversion electron |
|
6.13253e-01 |
7.470e-02 |
Conversion electron |
|
6.13849e-01 |
1.778e-02 |
Conversion electron |
|
6.16060e-01 |
1.770e-02 |
Conversion electron |
|
6.26045e-01 |
2.863e-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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