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Radionuclide Dosimetric Data Sheets
Lead-197m
Summary data
General
Classification
Isotope: Pb-197m
Atomic number (Z): 82
Mass number (A): 197
Neutron number (N): 115
Radioactive decay
Decay modes: β+, Electron capture, Internal
transition
Half-life: 43.0 [m]
Decay constant: 2.6866e-04 [1/s]
Daughters: Tl-197 (81.0%), Pb-197 (19.0%)
Radioactive daughters: Tl-197, Pb-197
Dosimetric constants
Mean alpha energy: 0.0 [MeV]
Mean electron energy: 0.2477 [MeV]
Mean photon energy: 1.17319 [MeV]
Air kerma rate constant, Γ10: 6.581e-17 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 6.663e-17 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 3.969e-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-:
3.969e-14 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 1.880e-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-197m 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-197m 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-197m 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-197m Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
2.07438e-05 |
1.858e+01 |
X-ray |
|
2.66144e-05 |
4.412e+00 |
X-ray |
|
2.30378e-03 |
6.494e-02 |
X-ray |
|
2.37848e-03 |
1.647e-02 |
X-ray |
|
8.98130e-03 |
1.088e-02 |
X-ray |
|
1.01663e-02 |
1.901e-02 |
X-ray |
|
1.02661e-02 |
1.674e-01 |
X-ray |
|
1.05510e-02 |
4.289e-02 |
X-ray |
|
1.22523e-02 |
1.548e-01 |
X-ray |
|
1.22749e-02 |
3.190e-02 |
X-ray |
|
1.26563e-02 |
1.486e-02 |
X-ray |
|
1.43397e-02 |
3.127e-02 |
X-ray |
|
7.10519e-02 |
2.375e-01 |
X-ray |
|
7.30390e-02 |
1.905e-02 |
X-ray |
|
7.31380e-02 |
4.007e-01 |
X-ray |
|
7.52501e-02 |
3.200e-02 |
X-ray |
|
8.23884e-02 |
4.445e-02 |
X-ray |
|
8.28534e-02 |
8.606e-02 |
X-ray |
|
8.49000e-02 |
4.807e-02 |
Gamma |
|
8.50837e-02 |
1.054e-02 |
X-ray |
|
8.51979e-02 |
2.067e-02 |
X-ray |
|
2.22750e-01 |
2.461e-01 |
Gamma |
|
2.90950e-01 |
1.130e-02 |
Gamma |
|
3.07900e-01 |
2.988e-02 |
Gamma |
|
3.85850e-01 |
7.357e-01 |
Gamma |
|
3.87720e-01 |
2.511e-01 |
Gamma |
|
4.16210e-01 |
2.285e-02 |
Gamma |
|
4.88240e-01 |
1.381e-02 |
Gamma |
|
5.06000e-01 |
1.055e-02 |
Gamma |
|
5.11000e-01 |
4.248e-02 |
Annihilation photon |
|
5.57800e-01 |
3.515e-02 |
Gamma |
|
6.16420e-01 |
1.105e-02 |
Gamma |
|
6.95620e-01 |
9.542e-02 |
Gamma |
|
7.06840e-01 |
1.582e-02 |
Gamma |
|
7.15070e-01 |
1.105e-02 |
Gamma |
|
7.24110e-01 |
3.741e-02 |
Gamma |
|
7.74260e-01 |
1.406e-01 |
Gamma |
|
8.35760e-01 |
1.030e-02 |
Gamma |
|
8.93280e-01 |
2.134e-02 |
Gamma |
|
9.20250e-01 |
1.155e-02 |
Gamma |
|
9.57700e-01 |
5.876e-02 |
Gamma |
|
9.98590e-01 |
2.385e-02 |
Gamma |
|
1.11766e+00 |
3.214e-02 |
Gamma |
|
1.01673e+00 |
1.089e-02 |
Positron |
|
4.21378e-05 |
9.963e-01 |
Auger electron |
|
4.30532e-05 |
4.081e+00 |
Auger electron |
|
7.59354e-05 |
6.087e+00 |
Auger electron |
|
8.27457e-05 |
1.426e+00 |
Auger electron |
|
1.73849e-04 |
7.487e-01 |
Auger electron |
|
1.74981e-04 |
3.205e+00 |
Auger electron |
|
4.24214e-04 |
7.048e-01 |
Auger electron |
|
4.27081e-04 |
1.770e-01 |
Auger electron |
|
8.07228e-04 |
1.081e-01 |
Auger electron |
|
9.94332e-04 |
1.907e-01 |
Auger electron |
|
1.86377e-03 |
1.668e+00 |
Auger electron |
|
1.90746e-03 |
3.974e-01 |
Auger electron |
|
2.11143e-03 |
1.968e-01 |
Auger electron |
|
2.16750e-03 |
4.944e-02 |
Auger electron |
|
7.95849e-03 |
4.946e-01 |
Auger electron |
|
8.01520e-03 |
1.046e-01 |
Auger electron |
|
1.02559e-02 |
2.156e-01 |
Auger electron |
|
1.03957e-02 |
4.626e-02 |
Auger electron |
|
1.25834e-02 |
2.259e-02 |
Auger electron |
|
5.72241e-02 |
2.058e-02 |
Auger electron |
|
6.88063e-02 |
1.120e-02 |
Auger electron |
|
6.90530e-02 |
9.782e-02 |
Conversion electron |
|
8.18454e-02 |
2.548e-02 |
Conversion electron |
|
1.36952e-01 |
8.658e-02 |
Conversion electron |
|
1.46110e-01 |
6.753e-02 |
Conversion electron |
|
2.07420e-01 |
2.332e-02 |
Conversion electron |
|
2.08004e-01 |
2.233e-01 |
Conversion electron |
|
2.10090e-01 |
1.024e-01 |
Conversion electron |
|
2.18553e-01 |
3.644e-02 |
Conversion electron |
|
2.19805e-01 |
9.517e-02 |
Conversion electron |
|
2.21360e-01 |
4.009e-02 |
Conversion electron |
|
2.22750e-01 |
2.936e-02 |
Conversion electron |
|
2.31345e-01 |
2.550e-02 |
Conversion electron |
|
3.00052e-01 |
5.222e-02 |
Conversion electron |
|
3.01922e-01 |
3.596e-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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