This study presents the development of transmissive thin-film scintillators made from CsPbBr₃ nanocrystals for real-time single-proton counting. These perovskite scintillators exhibit high sensitivity, with a light yield of approximately 100,000 photons per MeV when exposed to proton beams. The enhanced sensitivity is attributed to radiative emission from biexcitons generated through proton-induced upconversion and impact ionization. The scintillators can detect as few as seven protons per second, making them suitable for applications such as single-proton tracing, patterned irradiation, and super-resolution proton imaging. The combination of rapid response (~336 ps) and ionostability enables diverse applications, including improved proton dosimetry in proton therapy and radiography. The study also investigates the mechanisms of proton-induced luminescence and demonstrates the performance of CsPbBr₃ nanocrystal scintillators in single-proton counting and high-resolution proton imaging.This study presents the development of transmissive thin-film scintillators made from CsPbBr₃ nanocrystals for real-time single-proton counting. These perovskite scintillators exhibit high sensitivity, with a light yield of approximately 100,000 photons per MeV when exposed to proton beams. The enhanced sensitivity is attributed to radiative emission from biexcitons generated through proton-induced upconversion and impact ionization. The scintillators can detect as few as seven protons per second, making them suitable for applications such as single-proton tracing, patterned irradiation, and super-resolution proton imaging. The combination of rapid response (~336 ps) and ionostability enables diverse applications, including improved proton dosimetry in proton therapy and radiography. The study also investigates the mechanisms of proton-induced luminescence and demonstrates the performance of CsPbBr₃ nanocrystal scintillators in single-proton counting and high-resolution proton imaging.