PbWO_(4) crystal is a dense,fast and radiation hard scintillator which is being t ested to be used as a radiator of EM calorimeters.With a density of 8.2g/cm^(3),t his crystal is having a decay time of less than 10nm ...PbWO_(4) crystal is a dense,fast and radiation hard scintillator which is being t ested to be used as a radiator of EM calorimeters.With a density of 8.2g/cm^(3),t his crystal is having a decay time of less than 10nm for about 85% of light outp ut.Its unit radiation length, x_(0) is shorter than any of the well establish ed scintillators. In order to improve the scintillating property,CeO_(2)(0.01wt%) and Ge_(2)O_(3) add ed into PWO,Ce:Ge:PWO crystal was grown by Czochraski method.The growth technolo gy parameters were:the temperature gradient of 40℃/cm,the rotating rate of 30r/ m in and the growth speed of 1 2mm/h.The transmissibility of pure PWO crystal was 68%,where as that of Ce:Ge:PWO was 70%.The light yield of pure PWO and Ce:Ge:PWO was 9.5p.e./MeV and 14.6 p.e./MeV,respectively.展开更多
文摘PbWO_(4) crystal is a dense,fast and radiation hard scintillator which is being t ested to be used as a radiator of EM calorimeters.With a density of 8.2g/cm^(3),t his crystal is having a decay time of less than 10nm for about 85% of light outp ut.Its unit radiation length, x_(0) is shorter than any of the well establish ed scintillators. In order to improve the scintillating property,CeO_(2)(0.01wt%) and Ge_(2)O_(3) add ed into PWO,Ce:Ge:PWO crystal was grown by Czochraski method.The growth technolo gy parameters were:the temperature gradient of 40℃/cm,the rotating rate of 30r/ m in and the growth speed of 1 2mm/h.The transmissibility of pure PWO crystal was 68%,where as that of Ce:Ge:PWO was 70%.The light yield of pure PWO and Ce:Ge:PWO was 9.5p.e./MeV and 14.6 p.e./MeV,respectively.
