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Optical and PET images of aqueous suspension of [64Cu]CIS/ZnS RQDs with different amount of radioactivity and QDs in a 96-well plate. (A) Amount of RQDs kept constant (50 μg); (C) amount of radioactivity (150 μCi) kept constant. (B) Corresponding plot of photon flux vs radioactivity; (D) corresponding plot of photon flux vs QD concentration. The CRET luminescence images were acquired with a red filter (>590 nm).
