On the doping effects and structural defects in some classical inorganic scintillation crystals
Inorganic scintillation crystals belong to optical functional crystal materials which can convert high energy particles to UV or visible light,and therefore have been widely applied in radiation detection technology.However,some structural defects formed in the crystal growth process are detrimental to the scintillation properties of the crystals,so that some practical applications of the crystals are hampered.In order to eliminate these defects,some elements are intentionally doped into the crystal to suppress the detriments of the defects and to significantly improve the scintillation performance of the crystals.Even though the doping concentration is very few,little thing can make a big difference.Therefore,the doping modification has been regarded as an important method to optimize the crystal performance.However,the micro processes and mechanisms on the doping effects are very complicated so that different explanations have been debated for a long time.Based on our recent measurement results,in this article,we have reviewed the main defects and doping effects of some classical scintillation crystals,such as lead tungstate(PbWO4),bismuth germanate(Bi4Ge3O12),barium fluoride(BaF2)and lutetium silicate(Lu2SiO5),proposed some new explanations for attempting to explore and elucidate the internal mechanism of doping effects in these crystals from the microscopic level in order to provide reference for the development of related materials in the future.
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