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Radionuclide Dosimetric Data Sheets
Mercury-191m
Summary data
General
Classification
Isotope: Hg-191m
Atomic number (Z): 80
Mass number (A): 191
Neutron number (N): 111
Radioactive decay
Decay modes: β+, Electron capture
Half-life: 50.8 [m]
Decay constant: 2.2741e-04 [1/s]
Daughters: Au-191 (100.0%)
Radioactive daughters: Au-191
Dosimetric constants
Mean alpha energy: 0.0 [MeV]
Mean electron energy: 0.13781 [MeV]
Mean photon energy: 1.4895 [MeV]
Air kerma rate constant, Γ10: 6.057e-17 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 6.177e-17 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 2.208e-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-:
2.208e-14 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 2.386e-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/Hg-191m 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-191m 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/Hg-191m 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/Hg-191m Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
1.10947e-05 |
2.905e+01 |
X-ray |
|
2.14846e-03 |
8.564e-02 |
X-ray |
|
8.52062e-03 |
1.657e-02 |
X-ray |
|
9.62130e-03 |
2.883e-02 |
X-ray |
|
9.70979e-03 |
2.540e-01 |
X-ray |
|
1.14753e-02 |
1.063e-01 |
X-ray |
|
1.15870e-02 |
4.745e-02 |
X-ray |
|
1.34225e-02 |
2.098e-02 |
X-ray |
|
6.71839e-02 |
3.047e-01 |
X-ray |
|
6.90380e-02 |
5.184e-01 |
X-ray |
|
7.78158e-02 |
5.702e-02 |
X-ray |
|
7.82261e-02 |
1.103e-01 |
X-ray |
|
8.03237e-02 |
1.337e-02 |
X-ray |
|
8.04227e-02 |
2.613e-02 |
X-ray |
|
1.96500e-01 |
2.565e-02 |
Gamma |
|
2.24900e-01 |
3.420e-02 |
Gamma |
|
2.41400e-01 |
1.214e-01 |
Gamma |
|
2.52600e-01 |
5.700e-01 |
Gamma |
|
2.74100e-01 |
1.311e-01 |
Gamma |
|
3.31600e-01 |
4.332e-02 |
Gamma |
|
3.43300e-01 |
1.482e-02 |
Gamma |
|
3.57000e-01 |
4.845e-02 |
Gamma |
|
3.57000e-01 |
4.845e-02 |
Gamma |
|
3.71000e-01 |
6.270e-02 |
Gamma |
|
4.09700e-01 |
2.793e-02 |
Gamma |
|
4.20300e-01 |
1.858e-01 |
Gamma |
|
4.41000e-01 |
1.140e-02 |
Gamma |
|
5.11000e-01 |
6.191e-02 |
Annihilation photon |
|
5.11000e-01 |
2.280e-02 |
Gamma |
|
5.21500e-01 |
3.933e-02 |
Gamma |
|
5.36100e-01 |
8.037e-02 |
Gamma |
|
5.45600e-01 |
1.539e-02 |
Gamma |
|
5.49500e-01 |
2.052e-02 |
Gamma |
|
5.52500e-01 |
1.596e-02 |
Gamma |
|
5.78700e-01 |
1.761e-01 |
Gamma |
|
6.10600e-01 |
4.674e-02 |
Gamma |
|
6.37100e-01 |
1.425e-02 |
Gamma |
|
6.62000e-01 |
1.140e-02 |
Gamma |
|
6.71000e-01 |
2.964e-02 |
Gamma |
|
6.78600e-01 |
2.166e-02 |
Gamma |
|
6.83200e-01 |
1.311e-02 |
Gamma |
|
6.90000e-01 |
2.166e-02 |
Gamma |
|
7.18000e-01 |
3.078e-02 |
Gamma |
|
7.77800e-01 |
1.710e-02 |
Gamma |
|
8.20800e-01 |
1.197e-02 |
Gamma |
|
8.87000e-01 |
1.824e-02 |
Gamma |
|
9.38300e-01 |
1.140e-02 |
Gamma |
|
9.96400e-01 |
2.337e-02 |
Gamma |
|
1.00270e+00 |
1.539e-02 |
Gamma |
|
1.09130e+00 |
1.197e-02 |
Gamma |
|
1.10930e+00 |
1.767e-02 |
Gamma |
|
1.28440e+00 |
1.938e-02 |
Gamma |
|
1.32980e+00 |
2.907e-02 |
Gamma |
|
1.33810e+00 |
1.083e-02 |
Gamma |
|
1.39180e+00 |
1.083e-02 |
Gamma |
|
1.44780e+00 |
1.539e-02 |
Gamma |
|
1.50360e+00 |
1.995e-02 |
Gamma |
|
1.53250e+00 |
1.026e-02 |
Gamma |
|
1.54880e+00 |
1.938e-02 |
Gamma |
|
1.73940e+00 |
1.425e-02 |
Gamma |
|
1.90810e+00 |
1.596e-02 |
Gamma |
|
9.36900e-01 |
1.299e-02 |
Positron |
|
4.01518e-05 |
6.433e+00 |
Auger electron |
|
6.45085e-05 |
9.761e+00 |
Auger electron |
|
1.74645e-04 |
5.198e+00 |
Auger electron |
|
4.19448e-04 |
1.141e+00 |
Auger electron |
|
7.76723e-04 |
2.047e-01 |
Auger electron |
|
1.75994e-03 |
2.525e+00 |
Auger electron |
|
1.77800e-03 |
3.936e-01 |
Conversion electron |
|
1.98710e-03 |
2.639e-01 |
Auger electron |
|
2.33125e-03 |
1.312e-02 |
Auger electron |
|
7.32300e-03 |
6.780e-01 |
Auger electron |
|
8.36600e-03 |
1.516e-01 |
Conversion electron |
|
9.44129e-03 |
2.841e-01 |
Auger electron |
|
1.09660e-02 |
3.258e-01 |
Conversion electron |
|
1.11000e-02 |
4.698e-02 |
Conversion electron |
|
1.15825e-02 |
2.885e-02 |
Auger electron |
|
1.37000e-02 |
1.014e-01 |
Conversion electron |
|
5.42437e-02 |
2.773e-02 |
Auger electron |
|
6.50992e-02 |
1.493e-02 |
Auger electron |
|
1.15540e-01 |
2.369e-02 |
Conversion electron |
|
1.60440e-01 |
1.291e-02 |
Conversion electron |
|
1.71640e-01 |
1.687e-01 |
Conversion electron |
|
1.93140e-01 |
4.779e-02 |
Conversion electron |
|
2.38264e-01 |
2.491e-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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