Compositional change in human enamel irradiated with MIR free electron laser  

作　　者：LIU Nianqing LI Yonggui ZHU Junbiao ZHANG Liwen WANG Mingkai WU Gang YANG Xueping Li Guangcheng Huang Yuying DONG Yanmei GAO Xuejun 

机构地区：[1]Institute of High Energy Physics,Chinese Academy of Sciences,Beijing 100039,China [2]Stomatological College,Peking University,Beijing 100081,China [3]不详

出　　处：《Chinese Science Bulletin》2001年第23期2016-2018,共3页

基　　金：This work was jointly supported by the National High Technology Laser Technology Field Foundation (Grant No. 863-410) ; the National Natural Science Foundation of China (Grant No. 19975055).

摘　　要：The purpose of this study was to investigate compositional changes in human enamel irradiated with the free electron laser (FEL). The exposure on dental enamel at the wavelength of 9.64 μm was observed with the Beijing free electron laser. The distribution of elements in the irradiated or non-irradiated enamel was measured by scanning electron microscope (SEM) with energy-dispersive spectroscopy and synchrotron radiation X-ray fluorescence (SRXRF) in Beijing Synchrotron Radiation Facility (BSRF). The results showed that the P/Ca ratio in the ablation region of enamel at the maximum wavelength of infrared absorption was obviously smaller than that at the non-maximum wavelength. In the ablation region the ratios of P/Ca and Ca/Sr were smaller than those in the non-ablation region. The distributions of P, Ca and Sr in the ablation region were heterogeneous due to the element change caused by FEL irradiation.The purpose of this study was to investigate compositional changes in human enamel irradiated with the free electron laser (FEL). The exposure on dental enamel at the wavelength of 9.64μm was observed with the Beijing free electron laser. The distribution of elements in the irradiated or non-irradiated enamel was measured by scanning electron microscope (SEM) with energy-dispersive spectroscopy and synchrotron radiation X-ray fluorescence (SRXRF) in Beijing Synchrotron Radiation Facility (BSRF). The results showed that the P/Ca ratio in the ablation region of enamel at the maximum wavelength of infrared absorption was obviously smaller than that at the non-maximum wavelength. In the ablation region the ratios of P/Ca and Ca/Sr were smaller than those in the non-ablation region. The distributions of P, Ca and Sr in the ablation region were heterogeneous due to the element change caused by FEL irradiation.

关 键 词：human ENAMEL BEIJING free electron laser SYNCHROTRON radiation X-ray FLUORESCENCE ablation ELEMENT distribution. 

分 类 号：TN249[电子电信—物理电子学]