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Nuclide reference

Ag-108 — Silver-108

The half-life of Ag-108 is 2.382 min. Main decay mode: β⁻ decay to Cd-108 (97.15%).

Identification

Element
Silver (Ag)
Atomic number Z
47
Mass number A
108
State
Radioactive

Key quantities

Half-life
2.382 min
Specific activity
2.704e+19 Bq/g
Gamma constant Γ
—
D-value (НП-067-24)
—

Decay modes

  • β⁻ decay → Cd-108 — 97.15 %
  • β⁺ decay / electron capture → Pd-108 — 2.85 %

Main gamma lines

Energy, keVYield, %
632.981.761
21.177 · X-ray line0.9924
510.999 · annihilation 511 keV0.5652
21.021 · X-ray line0.5254
433.960.4987
618.860.2613
1,007.220.01392
880.260.003192
1,441.140.003042
497.10.002244

Lines of the bare nuclide (ENDF/B-VIII.0), without daughter ingrowth.

Alpha and beta particles

RadiationEnergy, keVYield, %
β⁻, E max1,65095.46
1,0171.761
β⁺, E max9000.28

For β⁻ and β⁺ the endpoint (maximum) energy of the spectrum is given. ENDF/B-VIII.0.

Related calculators

DecayActivity ↔ massDose rate
Reference data vs computed valuesHalf-life, gamma lines and D-value are reference data (ENDF/B-VIII.0, НП-067-24).Gamma constant Γ is H*(10) at 1 m computed from ICRP-107 spectra (NIST µ_en/ρ, ICRP-74 Table A.21) including short-lived progeny in equilibrium (e.g. Cs-137/Ba-137m, Ra-226 series); specific activity uses molar mass M ≈ mass number A.K-series X-ray energies are from NIST SRD 128 (Deslattes et al., 2003): in ENDF/B-VIII.0 they are given to 1 % and shifted by up to 0.7 keV for heavy elements. L-series lines and all yields are ENDF/B-VIII.0.

Silver-108 (Ag-108) — reference data

What is in the card

This card gathers the key data of radionuclide Ag-108 in one place: half-life, decay modes, main gamma lines, alpha and beta particle energies, gamma constant, specific activity and the D-value for source categorization. Decay and emission data are from ENDF/B-VIII.0; the D-value follows NP-067-24; the gamma constant is the ambient dose equivalent H*(10) at 1 m, computed from ICRP-107 spectra.

How to use the data

Half-life and specific activity let you recalculate the activity of a Ag-108 source to the delivery or disposal date — use the decay calculator. Gamma lines with yields identify the nuclide from a spectrum and pick the line for gamma spectrometry; the gamma constant Γ gives the dose rate at a distance, while the D-value and A1/A2 set the source category and the package type for transport.