  The performance and radiation tolerance of the proton detector based on
MAPbBr3 perovskite single crystal are investigated here with 3MeV protons. The
detector can monitor fluence rate and dose quantificationally at a low applied
bias electric field(0.01$V/{\mu}m$) within a dose range of 45 kGy. The detector
can also be worked at zero bias due to the Dember effect. The dark current of
the detector reduced to 20% of the initial value after being irradiated with
protons to a total fluence of $7.3\times 10^{13} p/cm^2$ (1 MGy), however, it
can be recovered at room temperature within hours. These results suggest that
this kind of detector has a promising application in proton therapy and proton
imaging etc.
