Mo-99/Tc-99m Generator Yield
Predict the Tc-99m activity available from a molybdenum-99 generator at any time after the last elution, free online.
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Mo-99 (half-life 65.94 h) decays to Tc-99m (6.01 h) with a branching ratio of about 87.5%. After elution the daughter grows back: A_Tc(t) = A_Mo · 0.875 · λ_Tc ÷ (λ_Tc − λ_Mo) · (e^(−λ_Mo t) − e^(−λ_Tc t)), peaking about 23 hours after elution (transient equilibrium).