Phosphor converts excitation energy into light,resulting in lumminescence.The luminescence caused by radiation is called scintillation.Since the discovery of the scintillation in NaI∶Tl crystal in 1948,a series of ma...Phosphor converts excitation energy into light,resulting in lumminescence.The luminescence caused by radiation is called scintillation.Since the discovery of the scintillation in NaI∶Tl crystal in 1948,a series of materials with profound scintillating characteristics have been developed and have found wide applications for radiation detection in different fields such as nuclear physics,high energy physics,medical diagnostic imaging,geophysics exploration,clandestine explosive finding and many industrial measuring systems. Inorganic scintillating crystals have superior characteristics over their organic counterparts and some kinds of ceramics,glasses and powders that do have their scintillation effects.We will confine ourselves mainly to inorganic scintillating crystals in this presentation..展开更多
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Phosphor converts excitation energy into light,resulting in lumminescence.The luminescence caused by radiation is called scintillation.Since the discovery of the scintillation in NaI∶Tl crystal in 1948,a series of materials with profound scintillating characteristics have been developed and have found wide applications for radiation detection in different fields such as nuclear physics,high energy physics,medical diagnostic imaging,geophysics exploration,clandestine explosive finding and many industrial measuring systems. Inorganic scintillating crystals have superior characteristics over their organic counterparts and some kinds of ceramics,glasses and powders that do have their scintillation effects.We will confine ourselves mainly to inorganic scintillating crystals in this presentation..
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.
