In proton single-event-effects experiments

and proton accelerators for advanced researches

precise measurement of proton beam current is important for reliability and accuracy of the experiments.Traditional detection methods

such as Faraday cup

Si(Au) surface barrier detector

and diamond detector

are of beam-block type measurements

where changes in proton beam current can hardly be monitored in-site.In this paper

film scintillators are used to detect the proton beam.Protons travel through the film scintillator

deposit part of the energy and make the scintillator emit lights

which are collected by a photomultiplier tube.Rresponse of the film scintillator to protons are calculated and verified by experiments with proton beams at 3–10 MeV from the 2×6 MeV tandem accelerator at Peking University.