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3059716 
Book/Book Chapter 
Properties and applications of gadolinium oxysulfide based ceramic scintillators 
Rossner, W; Ostertag, M; Jermann, F 
1999 
ELECTROCHEMICAL SOCIETY SERIES 
98 
24 
187-194 
WOS:000079309100019 
Within the last decade ceramic scintillators have been developed with improved properties compared to single crystal scintillators. Among the considered material systems, gadolinium oxysulfide ceramics activated with trivalent praseodymium gives an advantageous high intrinsic X-ray to light conversion efficiency, short decay time and low afterglow for ultra fast X-ray imaging applications. Both quantities, efficiency and afterglow indicate that the disordered regions of the grain boundaries in the ceramic host are not restricting as generally expected By such ceramic scintillators luminescence-based solid state X-ray detectors have been reintroduced for X-ray sampling in medical computed tomography (CT). By the use of the specifically tailored gadolinium oxysulfide based ceramics developed at Siemens, ultra fast, high efficiency, low noise CT-detectors are achieved resulting in outstanding image quality. Due to the fact that no afterglow correction of the measured data is needed a reduction of the patient dose up to 30% can be achieved.