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Radionuclide Dosimetric Data Sheets
Silver-108m
Summary data
General
Classification
Isotope: Ag-108m
Atomic number (Z): 47
Mass number (A): 108
Neutron number (N): 61
Radioactive decay
Decay modes: Electron capture, Internal transition
Half-life: 418.0 [y]
Decay constant: 5.2548e-11 [1/s]
Daughters: Ag-108 (8.7%), Pd-108 (91.3%)
Radioactive daughters: Ag-108
Dosimetric constants
Mean alpha energy: 0.0 [MeV]
Mean electron energy: 0.01591 [MeV]
Mean photon energy: 1.62088 [MeV]
Air kerma rate constant, Γ10: 6.798e-17 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 6.798e-17 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 2.549e-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-:
2.549e-15 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 2.597e-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/Ag-108m 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/Ag-108m 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/Ag-108m Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
7.85937e-06 |
7.440e+00 |
X-ray |
|
1.20703e-05 |
7.236e-01 |
X-ray |
|
2.82809e-03 |
2.445e-02 |
X-ray |
|
2.98437e-03 |
1.144e-02 |
X-ray |
|
2.09884e-02 |
1.850e-01 |
X-ray |
|
2.11504e-02 |
3.496e-01 |
X-ray |
|
2.37657e-02 |
3.011e-02 |
X-ray |
|
2.37942e-02 |
5.852e-02 |
X-ray |
|
2.42659e-02 |
1.179e-02 |
X-ray |
|
7.91310e-02 |
6.627e-02 |
Gamma |
|
4.33937e-01 |
9.048e-01 |
Gamma |
|
6.14276e-01 |
8.984e-01 |
Gamma |
|
7.22907e-01 |
9.084e-01 |
Gamma |
|
3.77533e-05 |
2.646e-01 |
Auger electron |
|
3.81911e-05 |
2.805e+00 |
Auger electron |
|
1.21651e-04 |
1.791e-01 |
Auger electron |
|
1.25430e-04 |
7.457e-02 |
Auger electron |
|
1.25820e-04 |
7.367e-01 |
Auger electron |
|
1.35136e-04 |
1.194e-02 |
Auger electron |
|
2.92952e-04 |
1.817e+00 |
Auger electron |
|
3.19067e-04 |
1.788e-01 |
Auger electron |
|
2.38270e-03 |
6.885e-01 |
Auger electron |
|
2.46715e-03 |
6.667e-02 |
Auger electron |
|
2.75750e-03 |
1.397e-01 |
Auger electron |
|
2.87356e-03 |
1.439e-02 |
Auger electron |
|
1.76856e-02 |
9.761e-02 |
Auger electron |
|
2.05196e-02 |
3.874e-02 |
Auger electron |
|
2.65966e-02 |
1.057e-02 |
Conversion electron |
|
2.70300e-02 |
5.275e-02 |
Conversion electron |
|
2.98115e-02 |
1.674e-02 |
Conversion electron |
|
5.36420e-02 |
1.796e-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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