Scintillation crystals are the core component of nuclear radiation detectors, which can detect high-energy rays or particles such as X-rays, g-rays, and a particles. In the medical and health field, X-CT is what we often call CT (X-ray), also called X-ray tomography, PET (positron emission tomography) and other physical examinations, security and cargo inspections (such as customs container inspections, railway station and airport luggage inspections, etc.), high energy physics (particle detection and cosmic dark matter detection, etc.) , Oil well exploration and other fields have a wide range and a large number of applications.