YAG:Ce
Yttrium aluminum garnet activated by cerium is a fast scintillator with excellent mechanical and chemical resistance. YAG:Ce scintillation detectors are preferred for electron microscopy, beta and X-ray counting, as well as for electron and X-ray imaging screens. The material's mechanical properties enable production of thin screens down to 0.005 mm thick.
For more information see Scintillation material data