APPLICATIONS OF CERIUM-DOPED GADOLINIUM SILICATE GD2SIO5-CE SCINTILLATOR TO CALORIMETERS IN HIGH-RADIATION ENVIRONMENT

We have investigated applications of cerium-doped GSO (Gd2SiO5:Ce or G SO:Ce) scintillating crystals to high-precision electromagnetic calori meters in high-energy physics experiments. Basic properties of GSO:Ce such as the decay time, light yield and radiation hardness were measur ed using small (similar to 4 cm long) sample crystals. The radiation h ardness tests include the scintillator stability under Co-60 exposure. The characteristics of the observed residual phosphorescence due to r adiation were studied in detail. These properties are dependent on the Ce concentration. Between the two concentrations we tested, 0.5 and 1 .5 mol%, GSO:Ce scintillator with 1.5 mol% Ce is better in various asp ects. Recently, large ingots with 1.5 mol% Ce concentration have been grown successfully. We report optical properties of 2.5 x 2.5 x 26 cm( 3) crystals. We discuss the feasibility of GSO:Ce scintillator-based c alorimeters in operating under high radiation such as at future hadron collider experiments. (C) 1998 Elsevier Science B.V. All rights reser ved.