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Ferroptosis therapy induced by iron‐catalyzed Fenton reaction has offered enormous opportunities for tumor therapy. Unfortunately, high catalytic activity ferrous (Fe2+)‐based therapeutic agent has remained challenging due to the instability of Fe2+. Herein, an X‐ray‐activated Fe2+ supply platform, termed “PFCN”, containing the core of CaWO4 nanoscintillator to emit ultraviolet (UV) light and Fe3O...