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Decay of 68Ga and formation of 68Zn. (a) Calculated formation of 68Ga and 68Zn as f (time) in hours after elution of a 50 mCi (1.85 GBq) 68Ge/68Ga generator. The specific activity of 68Ga corresponds to 9.81 × 10−15 mol/MBq. (b) Calculated molar ratio of 68Zn versus 68Ga as f (time) in hours after post-prior elution of 50 mCi (1.85 GBq) 68Ga of a 68Ge/68Ga generator. In theory, 3 d after post-prior elution the molar ratio of [68Zn]/[68Ga] = 43.
