Cesium Iodide doped with Thallium (CsI:Tl) is a widely used inorganic scintillation crystal. Boasting a density of 4.51 g/cm³ and a light yield reaching 45% of NaI:Tl, it features an emission peak at 550 nm that matches well with silicon photodiodes. With low afterglow, excellent radiation hardness and non-cleavable structure, it serves as a key component in security screening, high-energy physics experiments and industrial non-destructive testing.
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