The radiation field in the workplace of nuclear facilities often contains both beta and gamma rays,and the existing mature equipment can hardly measure the beta and gamma spectra in the mixed field at the same time.The traditional secondary measurement method has a large error,and in order to solve the problem of mutual interference of gamma rays in the β-γ mixed field,this paper establishes a Monte Carlo model based on Geant4 stacked scintillation detector.The energy deposition of β and γ particles in the detector was simulated,and the optimal identification scheme of β and γ photons in the double-layer and triple-layer scintillator detector was studied,as well as the influence of different structures and materials on the detector discrimination performance.The simulation results show that after adding thin plastic scintillator,the error detection rate of the scintillator detector with three-layer structure is significantly lower than that with double-layer structure.Finally,the effect of scintillator combination of four different materials on the discrimination performance is compared,and the simulation results show that the second layer uses BC444 material for the best discrimination performance.
GEANT4Monte Carlophoswich scintillator detectorβ-γ mixed field
维普
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