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Radionuclide Dosimetric Data Sheets
Lead-194
Summary data
General
Classification
Isotope: Pb-194
Atomic number (Z): 82
Mass number (A): 194
Neutron number (N): 112
Radioactive decay
Decay modes: α, β+, Electron capture
Half-life: 12.0 [m]
Decay constant: 9.6270e-04 [1/s]
Daughters: Tl-194 (100.0%), Hg-190 (7.3e-06%)
Radioactive daughters: Tl-194, Hg-190
Dosimetric constants
Mean alpha energy: 0.0 [MeV]
Mean electron energy: 0.08444 [MeV]
Mean photon energy: 1.08324 [MeV]
Air kerma rate constant, Γ10: 5.620e-17 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 5.642e-17 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 1.353e-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-:
1.353e-14 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 1.736e-13
[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-194 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-194 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-194 Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
2.07374e-05 |
1.759e+01 |
X-ray |
|
2.30030e-03 |
6.189e-02 |
X-ray |
|
8.98130e-03 |
1.151e-02 |
X-ray |
|
1.01663e-02 |
2.012e-02 |
X-ray |
|
1.02661e-02 |
1.772e-01 |
X-ray |
|
1.22523e-02 |
1.135e-01 |
X-ray |
|
1.22749e-02 |
3.376e-02 |
X-ray |
|
1.43396e-02 |
2.293e-02 |
X-ray |
|
7.10519e-02 |
3.076e-01 |
X-ray |
|
7.31380e-02 |
5.190e-01 |
X-ray |
|
8.23884e-02 |
5.758e-02 |
X-ray |
|
8.28534e-02 |
1.115e-01 |
X-ray |
|
8.50837e-02 |
1.365e-02 |
X-ray |
|
8.51979e-02 |
2.678e-02 |
X-ray |
|
1.89440e-01 |
1.516e-02 |
Gamma |
|
1.92020e-01 |
4.515e-02 |
Gamma |
|
2.03800e-01 |
1.630e-01 |
Gamma |
|
2.25000e-01 |
5.053e-02 |
Gamma |
|
2.70520e-01 |
2.086e-02 |
Gamma |
|
3.67800e-01 |
8.150e-02 |
Gamma |
|
4.17920e-01 |
2.282e-02 |
Gamma |
|
4.60050e-01 |
3.048e-02 |
Gamma |
|
5.11000e-01 |
1.129e-02 |
Annihilation photon |
|
5.21550e-01 |
4.108e-02 |
Gamma |
|
5.60690e-01 |
1.359e-02 |
Gamma |
|
5.81820e-01 |
1.891e-01 |
Gamma |
|
6.66050e-01 |
1.661e-02 |
Gamma |
|
7.52800e-01 |
1.500e-02 |
Gamma |
|
7.94850e-01 |
1.108e-02 |
Gamma |
|
8.19500e-01 |
2.249e-02 |
Gamma |
|
9.26970e-01 |
1.242e-02 |
Gamma |
|
9.62640e-01 |
1.092e-02 |
Gamma |
|
9.98470e-01 |
2.038e-02 |
Gamma |
|
1.01054e+00 |
1.060e-02 |
Gamma |
|
1.05938e+00 |
3.879e-02 |
Gamma |
|
1.29440e+00 |
1.907e-02 |
Gamma |
|
1.51945e+00 |
1.646e-01 |
Gamma |
|
1.54940e+00 |
1.320e-02 |
Gamma |
|
1.81040e+00 |
1.566e-02 |
Gamma |
|
4.30136e-05 |
3.863e+00 |
Auger electron |
|
7.57461e-05 |
5.765e+00 |
Auger electron |
|
1.74495e-04 |
3.022e+00 |
Auger electron |
|
4.17581e-04 |
6.584e-01 |
Auger electron |
|
8.98579e-04 |
2.074e-01 |
Auger electron |
|
1.85886e-03 |
1.592e+00 |
Auger electron |
|
2.10431e-03 |
1.873e-01 |
Auger electron |
|
7.84440e-03 |
4.738e-01 |
Auger electron |
|
1.01354e-02 |
2.061e-01 |
Auger electron |
|
1.24540e-02 |
2.155e-02 |
Auger electron |
|
5.72241e-02 |
2.666e-02 |
Auger electron |
|
6.88063e-02 |
1.451e-02 |
Auger electron |
|
1.03642e-01 |
1.811e-02 |
Conversion electron |
|
1.18002e-01 |
1.492e-01 |
Conversion electron |
|
1.39202e-01 |
3.522e-02 |
Conversion electron |
|
1.88470e-01 |
2.290e-02 |
Conversion electron |
|
2.82002e-01 |
1.584e-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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