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Radionuclide Dosimetric Data Sheets
Mercury-194
Summary data
General
Classification
Isotope: Hg-194
Atomic number (Z): 80
Mass number (A): 194
Neutron number (N): 114
Radioactive decay
Decay modes: Electron capture
Half-life: 440.0 [y]
Decay constant: 4.9920e-11 [1/s]
Daughters: Au-194 (100.0%)
Radioactive daughters: Au-194
Dosimetric constants
Mean alpha energy: 0.0 [MeV]
Mean electron energy: 0.00784 [MeV]
Mean photon energy: 0.00271 [MeV]
Air kerma rate constant, Γ10: 4.638e-18 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 4.638e-18 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 1.256e-15 [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-:
1.256e-15 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 4.342e-16
[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/Hg-194 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/Hg-194 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/Hg-194 Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
1.10999e-05 |
1.548e+01 |
X-ray |
|
2.14846e-03 |
4.518e-02 |
X-ray |
|
9.62125e-03 |
1.159e-02 |
X-ray |
|
9.70980e-03 |
1.021e-01 |
X-ray |
|
1.11917e-02 |
1.736e-02 |
X-ray |
|
1.14753e-02 |
2.606e-02 |
X-ray |
|
1.15869e-02 |
1.907e-02 |
X-ray |
|
1.16020e-02 |
2.003e-02 |
X-ray |
|
4.01741e-05 |
3.458e+00 |
Auger electron |
|
6.54030e-05 |
5.187e+00 |
Auger electron |
|
1.74892e-04 |
2.745e+00 |
Auger electron |
|
4.24340e-04 |
6.372e-01 |
Auger electron |
|
6.02561e-04 |
4.993e-01 |
Auger electron |
|
1.75499e-03 |
1.322e+00 |
Auger electron |
|
1.97854e-03 |
1.367e-01 |
Auger electron |
|
7.51093e-03 |
3.071e-01 |
Auger electron |
|
9.65644e-03 |
1.293e-01 |
Auger electron |
|
1.18452e-02 |
1.325e-02 |
Auger 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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