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Radionuclide Dosimetric Data Sheets
Mercury-197m
Summary data
General
Classification
Isotope: Hg-197m
Atomic number (Z): 80
Mass number (A): 197
Neutron number (N): 117
Radioactive decay
Decay modes: Electron capture, Internal transition
Half-life: 23.8 [h]
Decay constant: 8.0900e-06 [1/s]
Daughters: Hg-197 (91.4%), Au-197 (8.6%)
Radioactive daughters: Hg-197
Dosimetric constants
Mean alpha energy: 0.0 [MeV]
Mean electron energy: 0.21704 [MeV]
Mean photon energy: 0.09774 [MeV]
Air kerma rate constant, Γ10: 1.186e-17 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 1.186e-17 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 3.477e-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-:
3.477e-14 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 1.566e-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-197m 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-197m 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-197m Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
1.11053e-05 |
2.486e+00 |
X-ray |
|
1.47013e-05 |
1.858e+01 |
X-ray |
|
2.22238e-03 |
6.040e-02 |
X-ray |
|
8.75020e-03 |
1.167e-02 |
X-ray |
|
9.70979e-03 |
2.005e-02 |
X-ray |
|
9.89220e-03 |
2.036e-02 |
X-ray |
|
9.98621e-03 |
1.793e-01 |
X-ray |
|
1.14753e-02 |
1.861e-02 |
X-ray |
|
1.18592e-02 |
9.979e-02 |
X-ray |
|
1.19286e-02 |
3.385e-02 |
X-ray |
|
1.38758e-02 |
1.993e-02 |
X-ray |
|
6.71839e-02 |
2.464e-02 |
X-ray |
|
6.90380e-02 |
4.193e-02 |
X-ray |
|
6.90989e-02 |
9.474e-02 |
X-ray |
|
7.10661e-02 |
1.606e-01 |
X-ray |
|
8.00792e-02 |
1.774e-02 |
X-ray |
|
8.05161e-02 |
3.433e-02 |
X-ray |
|
1.33980e-01 |
3.348e-01 |
Gamma |
|
2.79000e-01 |
6.097e-02 |
Gamma |
|
4.01465e-05 |
5.469e-01 |
Auger electron |
|
4.20395e-05 |
4.212e+00 |
Auger electron |
|
6.42132e-05 |
8.381e-01 |
Auger electron |
|
6.98715e-05 |
6.148e+00 |
Auger electron |
|
1.74545e-04 |
3.238e+00 |
Auger electron |
|
1.74806e-04 |
4.445e-01 |
Auger electron |
|
4.13563e-04 |
7.000e-01 |
Auger electron |
|
4.19154e-04 |
8.652e-02 |
Auger electron |
|
8.22912e-04 |
1.944e-01 |
Auger electron |
|
8.66680e-04 |
2.447e-02 |
Auger electron |
|
1.75860e-03 |
2.204e-01 |
Auger electron |
|
1.80816e-03 |
1.662e+00 |
Auger electron |
|
1.98121e-03 |
2.287e-02 |
Auger electron |
|
2.04189e-03 |
1.842e-01 |
Auger electron |
|
7.55856e-03 |
6.619e-02 |
Auger electron |
|
7.60251e-03 |
4.867e-01 |
Auger electron |
|
9.69241e-03 |
2.787e-02 |
Auger electron |
|
9.80764e-03 |
2.078e-01 |
Auger electron |
|
1.20387e-02 |
2.143e-02 |
Auger electron |
|
5.06270e-02 |
1.379e-01 |
Conversion electron |
|
8.16170e-02 |
1.995e-01 |
Conversion electron |
|
1.16424e-01 |
3.487e-02 |
Conversion electron |
|
1.18278e-01 |
2.244e-02 |
Conversion electron |
|
1.19154e-01 |
1.854e-02 |
Conversion electron |
|
1.19726e-01 |
1.782e-01 |
Conversion electron |
|
1.21693e-01 |
1.313e-01 |
Conversion electron |
|
1.27466e-01 |
1.632e-02 |
Conversion electron |
|
1.31143e-01 |
8.581e-02 |
Conversion electron |
|
1.33980e-01 |
2.567e-02 |
Conversion electron |
|
1.50144e-01 |
1.717e-01 |
Conversion electron |
|
1.50716e-01 |
4.068e-02 |
Conversion electron |
|
1.52683e-01 |
2.973e-01 |
Conversion electron |
|
1.62133e-01 |
1.580e-01 |
Conversion electron |
|
1.64970e-01 |
4.983e-02 |
Conversion electron |
|
1.98040e-01 |
1.901e-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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