多像素光子计数器的能量分辨性能测试

With the development of semiconductor photon detector technology, a novel signal readout device named multi pixel photon counter (MPPC) has gradually been developed and applied in radiation detection. [Purpose] This study aims to verify the performance of the MPPC and compare it with photomultiplier tube (PMT) in linearity and energy resolution. [Methods] First of all, scintillation detectors with MPPC coupling with scintillation crystals such as thallium-doped sodium iodide (NaI(Tl)), CsI, and Bi ₄ Ge ₃ O ₁₂ (BGO) crystals was constructed to test three characteristic γ-ray energy peaks of ¹³⁷ Cs and ⁶⁰ Co. Then the same tests were done with PMT (Hamamatsu H7195) coupling with these crystals as the parallel experiments. Simultaneously, the output signal of the MPPC was collected by using a waveform digitizer (CAEN DT5730) and a self-made pre-amplifier. [Results] The results show that the MPPC has a slightly worse energy resolution compared to that of PMT, but reserves a similar energy linearity. [Conclusion] This MPPC could be applied in circumstances such as the space detection and medical applications instead of PMT.