Characteristics of scintillation crystal in pet detector

High luminous efficiency, short decay time, stable optical properties, stable physical properties, good lattice matching, easy processing and installation, no radioactivity and environmental protection. Scintillation crystal is the key component of PET detector, and its characteristics have a vital influence on the performance of the detector. The following are some requirements about the characteristics of scintillation crystals: high luminous efficiency: scintillation crystals need to have high luminous efficiency and can effectively convert absorbed energy into visible light or ultraviolet light, so that photoelectric conversion devices can better detect it. Short decay time: the decay time of scintillation crystal should be short, that is, it quickly returns to dark state after emitting light, so as to ensure fast scintillation response and reduce signal overlap. Stability of optical performance: the optical performance of scintillation crystal should remain stable during multiple excitation and attenuation to ensure the long-term stability and reliability of the detector. Stable physical properties: Scintillation crystal should have high physical and chemical stability, and can keep its structure and performance stable under harsh environmental conditions. Good lattice matching: in order to obtain better scintillation performance, the scintillation crystal should match the lattice of the emitter to reduce lattice scattering and energy loss. Easy to process and install: the scintillation crystal should be easy to process and install, and can realize mass production and efficient assembly to reduce production costs. Non-radioactive and environmental protection: the scintillation crystal should be free from radioactive pollution, meet the requirements of environmental protection and ensure safe use.