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Radionuclide Dosimetric Data Sheets
Mercury-195m
Summary data
General
Classification
Isotope: Hg-195m
Atomic number (Z): 80
Mass number (A): 195
Neutron number (N): 115
Radioactive decay
Decay modes: β+, Electron capture, Internal
transition
Half-life: 41.6 [h]
Decay constant: 4.6284e-06 [1/s]
Daughters: Hg-195 (54.2%), Au-195 (45.8%)
Radioactive daughters: Hg-195, Au-195
Dosimetric constants
Mean alpha energy: 0.0 [MeV]
Mean electron energy: 0.14797 [MeV]
Mean photon energy: 0.20473 [MeV]
Air kerma rate constant, Γ10: 2.104e-17 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 2.104e-17 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 2.371e-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-:
2.371e-14 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 3.280e-14
[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-195m 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-195m 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-195m 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-195m Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
1.11031e-05 |
1.330e+01 |
X-ray |
|
1.46974e-05 |
2.320e+01 |
X-ray |
|
2.14727e-03 |
4.026e-02 |
X-ray |
|
2.22104e-03 |
7.502e-02 |
X-ray |
|
8.75019e-03 |
1.297e-02 |
X-ray |
|
9.62130e-03 |
1.274e-02 |
X-ray |
|
9.70979e-03 |
1.122e-01 |
X-ray |
|
9.89222e-03 |
2.262e-02 |
X-ray |
|
9.98623e-03 |
1.993e-01 |
X-ray |
|
1.14753e-02 |
9.304e-02 |
X-ray |
|
1.15521e-02 |
2.316e-02 |
X-ray |
|
1.15870e-02 |
2.097e-02 |
X-ray |
|
1.18592e-02 |
5.174e-02 |
X-ray |
|
1.19286e-02 |
3.761e-02 |
X-ray |
|
1.19891e-02 |
2.625e-02 |
X-ray |
|
1.34225e-02 |
1.837e-02 |
X-ray |
|
1.38758e-02 |
1.033e-02 |
X-ray |
|
3.70900e-02 |
1.844e-02 |
Gamma |
|
6.71839e-02 |
1.347e-01 |
X-ray |
|
6.90380e-02 |
2.292e-01 |
X-ray |
|
6.90989e-02 |
1.285e-02 |
X-ray |
|
7.10661e-02 |
2.178e-02 |
X-ray |
|
7.78158e-02 |
2.521e-02 |
X-ray |
|
7.82261e-02 |
4.878e-02 |
X-ray |
|
8.04227e-02 |
1.155e-02 |
X-ray |
|
2.61750e-01 |
3.090e-01 |
Gamma |
|
3.87870e-01 |
2.151e-02 |
Gamma |
|
5.60270e-01 |
7.007e-02 |
Gamma |
|
4.01449e-05 |
2.924e+00 |
Auger electron |
|
4.20398e-05 |
5.283e+00 |
Auger electron |
|
6.41322e-05 |
4.485e+00 |
Auger electron |
|
7.03496e-05 |
7.666e+00 |
Auger electron |
|
1.74544e-04 |
4.016e+00 |
Auger electron |
|
1.74667e-04 |
2.377e+00 |
Auger electron |
|
4.16959e-04 |
4.593e-01 |
Auger electron |
|
4.18574e-04 |
9.041e-01 |
Auger electron |
|
6.62869e-04 |
6.360e-01 |
Auger electron |
|
8.69606e-04 |
1.211e-01 |
Auger electron |
|
1.38100e-03 |
3.552e-01 |
Conversion electron |
|
1.75747e-03 |
1.183e+00 |
Auger electron |
|
1.80373e-03 |
2.057e+00 |
Auger electron |
|
1.95300e-03 |
4.384e-02 |
Conversion electron |
|
1.97960e-03 |
1.227e-01 |
Auger electron |
|
2.03547e-03 |
2.267e-01 |
Auger electron |
|
2.39048e-03 |
1.118e-02 |
Auger electron |
|
3.92000e-03 |
1.329e-02 |
Conversion electron |
|
7.51681e-03 |
3.558e-01 |
Auger electron |
|
7.61218e-03 |
5.314e-01 |
Auger electron |
|
9.64788e-03 |
1.497e-01 |
Auger electron |
|
9.82725e-03 |
2.271e-01 |
Auger electron |
|
1.18076e-02 |
1.527e-02 |
Auger electron |
|
1.20783e-02 |
2.349e-02 |
Auger electron |
|
1.33701e-02 |
9.639e-02 |
Conversion electron |
|
1.62070e-02 |
3.016e-02 |
Conversion electron |
|
2.22640e-02 |
3.523e-01 |
Conversion electron |
|
2.28360e-02 |
3.622e-02 |
Conversion electron |
|
3.42531e-02 |
9.207e-02 |
Conversion electron |
|
3.70900e-02 |
2.888e-02 |
Conversion electron |
|
3.94270e-02 |
4.578e-02 |
Conversion electron |
|
4.30240e-02 |
1.588e-01 |
Conversion electron |
|
4.48780e-02 |
1.436e-01 |
Conversion electron |
|
5.40660e-02 |
9.205e-02 |
Conversion electron |
|
5.42437e-02 |
1.226e-02 |
Auger electron |
|
5.68000e-02 |
2.762e-02 |
Conversion electron |
|
1.07954e-01 |
9.154e-02 |
Conversion electron |
|
1.08526e-01 |
1.954e-02 |
Conversion electron |
|
1.10493e-01 |
2.372e-01 |
Conversion electron |
|
1.19943e-01 |
1.147e-01 |
Conversion electron |
|
1.22780e-01 |
3.625e-02 |
Conversion electron |
|
1.80790e-01 |
1.076e-01 |
Conversion electron |
|
2.47414e-01 |
1.606e-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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