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Radionuclide Dosimetric Data Sheets
Gold-200m
Summary data
General
Classification
Isotope: Au-200m
Atomic number (Z): 79
Mass number (A): 200
Neutron number (N): 121
Radioactive decay
Decay modes: β-, Internal transition
Half-life: 18.7 [h]
Decay constant: 1.0296e-05 [1/s]
Daughters: Au-200 (18.0%), Hg-200 (82.0%)
Radioactive daughters: Au-200
Dosimetric constants
Mean alpha energy: 0.0 [MeV]
Mean electron energy: 0.2433 [MeV]
Mean photon energy: 1.98427 [MeV]
Air kerma rate constant, Γ10: 7.754e-17 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 7.754e-17 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 3.898e-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-:
3.898e-14 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 3.179e-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/Au-200m 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/Au-200m 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/Au-200m 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/Au-200m Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
1.11016e-05 |
2.833e+00 |
X-ray |
|
1.47094e-05 |
6.064e+00 |
X-ray |
|
2.22638e-03 |
1.971e-02 |
X-ray |
|
9.70980e-03 |
2.018e-02 |
X-ray |
|
9.98620e-03 |
5.153e-02 |
X-ray |
|
1.18592e-02 |
5.224e-02 |
X-ray |
|
1.38758e-02 |
1.043e-02 |
X-ray |
|
6.00800e-02 |
2.928e-02 |
Gamma |
|
6.90989e-02 |
5.963e-02 |
X-ray |
|
7.10661e-02 |
1.011e-01 |
X-ray |
|
8.00792e-02 |
1.116e-02 |
X-ray |
|
8.05161e-02 |
2.161e-02 |
X-ray |
|
1.11120e-01 |
1.850e-02 |
Gamma |
|
1.20280e-01 |
1.002e-02 |
Gamma |
|
1.33230e-01 |
2.850e-02 |
Gamma |
|
1.37280e-01 |
1.156e-02 |
Gamma |
|
1.44600e-01 |
1.002e-02 |
Gamma |
|
1.46070e-01 |
3.467e-02 |
Gamma |
|
1.81180e-01 |
5.550e-01 |
Gamma |
|
2.18510e-01 |
1.618e-02 |
Gamma |
|
2.55870e-01 |
7.091e-01 |
Gamma |
|
3.32820e-01 |
1.210e-01 |
Gamma |
|
3.67990e-01 |
7.323e-01 |
Gamma |
|
4.97770e-01 |
7.323e-01 |
Gamma |
|
5.79290e-01 |
7.168e-01 |
Gamma |
|
7.59500e-01 |
6.629e-01 |
Gamma |
|
9.04230e-01 |
7.708e-02 |
Gamma |
|
1.69056e-01 |
8.200e-01 |
Beta |
|
4.01636e-05 |
6.273e-01 |
Auger electron |
|
4.20608e-05 |
1.373e+00 |
Auger electron |
|
6.47891e-05 |
9.529e-01 |
Auger electron |
|
7.00141e-05 |
2.008e+00 |
Auger electron |
|
1.74587e-04 |
5.001e-01 |
Auger electron |
|
1.75117e-04 |
1.062e+00 |
Auger electron |
|
4.20453e-04 |
1.047e-01 |
Auger electron |
|
4.21776e-04 |
2.247e-01 |
Auger electron |
|
6.05746e-04 |
9.739e-02 |
Auger electron |
|
1.03787e-03 |
4.778e-02 |
Auger electron |
|
1.75064e-03 |
2.488e-01 |
Auger electron |
|
1.81356e-03 |
5.407e-01 |
Auger electron |
|
1.96950e-03 |
2.557e-02 |
Auger electron |
|
2.04883e-03 |
6.000e-02 |
Auger electron |
|
7.52155e-03 |
6.141e-02 |
Auger electron |
|
7.77497e-03 |
1.640e-01 |
Auger electron |
|
9.66721e-03 |
2.587e-02 |
Auger electron |
|
9.98955e-03 |
7.026e-02 |
Auger electron |
|
2.77670e-02 |
1.031e-02 |
Conversion electron |
|
4.57440e-02 |
1.229e-01 |
Conversion electron |
|
4.63040e-02 |
1.184e-02 |
Conversion electron |
|
5.73460e-02 |
3.166e-02 |
Conversion electron |
|
9.68660e-02 |
2.296e-02 |
Conversion electron |
|
9.78270e-02 |
1.191e-01 |
Conversion electron |
|
9.88330e-02 |
1.815e-02 |
Conversion electron |
|
1.08283e-01 |
1.118e-02 |
Conversion electron |
|
1.66354e-01 |
1.553e-02 |
Conversion electron |
|
1.66926e-01 |
7.736e-02 |
Conversion electron |
|
1.68893e-01 |
5.023e-02 |
Conversion electron |
|
1.72517e-01 |
2.374e-02 |
Conversion electron |
|
1.78343e-01 |
3.720e-02 |
Conversion electron |
|
1.81180e-01 |
1.118e-02 |
Conversion electron |
|
2.84637e-01 |
2.861e-02 |
Conversion electron |
|
4.14417e-01 |
1.456e-02 |
Conversion electron |
|
4.95937e-01 |
1.035e-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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