Hot Isostatic Pressed Gd₂O₂S:Pr, Ce, F Translucent Scintillator Ceramics for X-Ray Computed Tomography Detectors

Abstract

Translucent scintillator ceramics of Gd 2 O 2 S:Pr, Ce, F were fabricated using a hot isostatic pressing (HIP) technique. The optical transmission is about 60% of the incident light and the X-ray stopping power is also quite high. Owing to the enhancement of these properties by the HIP densification process, the highest light output from a 1 mm thick specimen combined with a silicon photodiode, when excited by 120 kV X-rays, has reached 1.8 times that of CdWO 4 single crystals. The present ceramics are very promising candidates for scintillator materials in X-ray computed tomography (CT) detector applications.