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.
About this calculator
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 ยท 0.875 ยท ฮป_Tc รท (ฮป_Tc โ ฮป_Mo) ยท (e^(โฮป_Mo t) โ e^(โฮป_Tc t)), peaking about 23 hours after elution (transient equilibrium).