Experimental study on fluence rate response of LaBr3 to pulsed X-rays

Highlights: • Measurement system designed for analyzing the linear response of a scintillator. • LaBr₃ detector had a linear response when the fluence rate < 1.8 × 10²⁰ MeV/(cm²$·$s). • Saturated LaBr₃ scintillator recovered after 24 h at room temperature. The linear response is the key property employed by a radiation detector to determine the accurate intensity of a pulse radiation field. In this study, we investigated the high fluence rate response behavior of a LaBr₃ scintillator. We used a high-intensity pulsed X-ray source called "QiangGuang-I" which could produce an X-ray pulse with a total dose of 100 Gy, full width at half maximum of 20 ± 5 ns, and an average energy of 1 MeV, to test the linear response of the LaBr₃ scintillator. The Lissajous figure method was used in this experiment. The results showed that the fluence rate linear response limit was more than 1.8 × 10²⁰ MeV/(cm²·s).