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(a) UV-vis and PL spectra of PGQD. (b) XRD. (c) FT-IR of GQD, PGQD and PEG.(d) TGA and DSC of PGQD and PEG. (e) The determination radiolabling yields of GQD (left) and PGQD (right) by paper chromatography in normal saline and acetone.