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Radionuclide Dosimetric Data Sheets
Silver-99
Summary data
General
Classification
Isotope: Ag-99
Atomic number (Z): 47
Mass number (A): 99
Neutron number (N): 52
Radioactive decay
Decay modes: β+, Electron capture
Half-life: 124.0 [s]
Decay constant: 5.5899e-03 [1/s]
Daughters: Pd-99 (100.0%)
Radioactive daughters: Pd-99
Dosimetric constants
Mean alpha energy: 0.0 [MeV]
Mean electron energy: 1.3076 [MeV]
Mean photon energy: 2.30916 [MeV]
Air kerma rate constant, Γ10: 4.993e-17 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 8.282e-17 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 2.095e-13 [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-:
2.095e-13 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 3.700e-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-99 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-99 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/Ag-99 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/Ag-99 Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
7.85944e-06 |
1.388e+00 |
X-ray |
|
2.09884e-02 |
3.548e-02 |
X-ray |
|
2.11504e-02 |
6.702e-02 |
X-ray |
|
2.37942e-02 |
1.122e-02 |
X-ray |
|
2.19900e-01 |
4.095e-02 |
Gamma |
|
2.64460e-01 |
6.500e-01 |
Gamma |
|
4.63730e-01 |
1.105e-02 |
Gamma |
|
5.11000e-01 |
1.699e+00 |
Annihilation photon |
|
5.68200e-01 |
3.835e-02 |
Gamma |
|
5.96200e-01 |
1.495e-02 |
Gamma |
|
6.36000e-01 |
1.430e-02 |
Gamma |
|
6.86990e-01 |
3.250e-02 |
Gamma |
|
8.05600e-01 |
1.255e-01 |
Gamma |
|
8.15630e-01 |
6.825e-02 |
Gamma |
|
8.16100e-01 |
1.300e-02 |
Gamma |
|
8.32290e-01 |
1.346e-01 |
Gamma |
|
8.38470e-01 |
2.080e-02 |
Gamma |
|
8.64000e-01 |
4.030e-02 |
Gamma |
|
9.63200e-01 |
1.040e-02 |
Gamma |
|
1.10260e+00 |
3.250e-02 |
Gamma |
|
1.17500e+00 |
1.235e-02 |
Gamma |
|
1.20398e+00 |
2.015e-02 |
Gamma |
|
1.27580e+00 |
2.470e-02 |
Gamma |
|
1.41650e+00 |
1.365e-02 |
Gamma |
|
1.43230e+00 |
1.560e-02 |
Gamma |
|
1.53190e+00 |
4.615e-02 |
Gamma |
|
1.54040e+00 |
1.430e-02 |
Gamma |
|
1.58530e+00 |
1.105e-02 |
Gamma |
|
1.87340e+00 |
2.405e-02 |
Gamma |
|
1.88100e+00 |
1.300e-02 |
Gamma |
|
1.90710e+00 |
1.235e-02 |
Gamma |
|
3.18180e+00 |
1.365e-02 |
Gamma |
|
8.05569e-01 |
2.620e-02 |
Positron |
|
9.60223e-01 |
1.067e-02 |
Positron |
|
1.00241e+00 |
1.941e-02 |
Positron |
|
1.01819e+00 |
2.523e-02 |
Positron |
|
1.15152e+00 |
1.165e-02 |
Positron |
|
1.22281e+00 |
6.211e-02 |
Positron |
|
1.29573e+00 |
5.337e-02 |
Positron |
|
1.32942e+00 |
3.688e-02 |
Positron |
|
1.46358e+00 |
1.262e-02 |
Positron |
|
1.50129e+00 |
4.464e-02 |
Positron |
|
1.51683e+00 |
4.755e-02 |
Positron |
|
1.62904e+00 |
6.696e-02 |
Positron |
|
1.63681e+00 |
2.523e-02 |
Positron |
|
1.63716e+00 |
3.591e-02 |
Positron |
|
1.69803e+00 |
1.844e-02 |
Positron |
|
1.89912e+00 |
2.911e-01 |
Positron |
|
3.81989e-05 |
5.230e-01 |
Auger electron |
|
1.21683e-04 |
3.154e-02 |
Auger electron |
|
1.26022e-04 |
1.374e-01 |
Auger electron |
|
2.92890e-04 |
3.393e-01 |
Auger electron |
|
2.38224e-03 |
1.293e-01 |
Auger electron |
|
2.75690e-03 |
2.623e-02 |
Auger electron |
|
1.76856e-02 |
1.871e-02 |
Auger electron |
|
2.40139e-01 |
1.575e-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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