<= Return to MIRDspec isotope database
Radionuclide Dosimetric Data Sheets
Lead-204m
Summary data
General
Classification
Isotope: Pb-204m
Atomic number (Z): 82
Mass number (A): 204
Neutron number (N): 122
Radioactive decay
Decay modes: Internal transition
Half-life: 67.2 [m]
Decay constant: 1.7191e-04 [1/s]
Daughters: Pb-204 (100.0%)
Radioactive daughters: None
Dosimetric constants
Mean alpha energy: 0.0 [MeV]
Mean electron energy: 0.10304 [MeV]
Mean photon energy: 2.06339 [MeV]
Air kerma rate constant, Γ10: 7.728e-17 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 7.728e-17 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 1.651e-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-:
1.651e-14 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 3.306e-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-204m 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-204m 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-204m Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
2.66274e-05 |
1.912e+00 |
X-ray |
|
1.05510e-02 |
1.856e-02 |
X-ray |
|
1.26563e-02 |
1.771e-02 |
X-ray |
|
7.30390e-02 |
2.780e-02 |
X-ray |
|
7.52501e-02 |
4.670e-02 |
X-ray |
|
8.52354e-02 |
1.008e-02 |
X-ray |
|
3.74740e-01 |
8.925e-01 |
Gamma |
|
8.99150e-01 |
9.917e-01 |
Gamma |
|
9.11740e-01 |
9.069e-01 |
Gamma |
|
4.22128e-05 |
4.285e-01 |
Auger electron |
|
8.22007e-05 |
6.200e-01 |
Auger electron |
|
1.74013e-04 |
3.269e-01 |
Auger electron |
|
4.24713e-04 |
6.997e-02 |
Auger electron |
|
1.03888e-03 |
2.263e-02 |
Auger electron |
|
1.91251e-03 |
1.748e-01 |
Auger electron |
|
2.17237e-03 |
2.177e-02 |
Auger electron |
|
8.18167e-03 |
5.276e-02 |
Auger electron |
|
1.05655e-02 |
2.339e-02 |
Auger electron |
|
2.86450e-01 |
3.495e-02 |
Conversion electron |
|
8.23450e-01 |
5.581e-02 |
Conversion electron |
|
8.95893e-01 |
1.237e-02 |
Conversion electron |
|
8.96489e-01 |
1.718e-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)
<= Return to MIRDspec isotope database
