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Radionuclide Dosimetric Data Sheets
Silver-109m
Summary data
General
Classification
Isotope: Ag-109m
Atomic number (Z): 47
Mass number (A): 109
Neutron number (N): 62
Radioactive decay
Decay modes: Internal transition
Half-life: 39.6 [s]
Decay constant: 1.7504e-02 [1/s]
Daughters: Ag-109 (100.0%)
Radioactive daughters: None
Dosimetric constants
Mean alpha energy: 0.0 [MeV]
Mean electron energy: 0.07695 [MeV]
Mean photon energy: 0.01108 [MeV]
Air kerma rate constant, Γ10: 3.733e-18 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 3.733e-18 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 1.233e-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-:
1.233e-14 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 1.775e-15
[Gy·kg/Bq·s]
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-109m 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-109m Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
1.20804e-05 |
6.725e+00 |
X-ray |
|
2.97344e-03 |
2.321e-02 |
X-ray |
|
3.14510e-03 |
1.517e-02 |
X-ray |
|
2.19609e-02 |
9.812e-02 |
X-ray |
|
2.21389e-02 |
1.849e-01 |
X-ray |
|
2.48888e-02 |
1.612e-02 |
X-ray |
|
2.49204e-02 |
3.133e-02 |
X-ray |
|
8.80336e-02 |
3.595e-02 |
Gamma |
|
3.78952e-05 |
2.442e+00 |
Auger electron |
|
1.28632e-04 |
6.895e-01 |
Auger electron |
|
1.34434e-04 |
9.911e-02 |
Auger electron |
|
3.18856e-04 |
1.659e+00 |
Auger electron |
|
2.49661e-03 |
6.458e-01 |
Auger electron |
|
2.90377e-03 |
1.399e-01 |
Auger electron |
|
1.84717e-02 |
4.742e-02 |
Auger electron |
|
2.14605e-02 |
1.916e-02 |
Auger electron |
|
6.25446e-02 |
4.088e-01 |
Conversion electron |
|
8.42502e-02 |
3.245e-02 |
Conversion electron |
|
8.45055e-02 |
1.918e-01 |
Conversion electron |
|
8.46836e-02 |
2.230e-01 |
Conversion electron |
|
8.74651e-02 |
9.213e-02 |
Conversion electron |
|
8.80336e-02 |
1.594e-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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