Compositional change in human enamel irradiated with MIR free electron laser |
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Authors: | Nianqing Liu Yonggui Li Junbiao Zhu Liwen Zhang Mingkai Wang Gang Wu Xueping Yang Guangcheng Li Yuying Huang Yanmei Dong Xuejun Gao |
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Institution: | (1) Institute of High Energy Physics, Chinese Academy of Sciences, 100039 Beijing, China;(2) Stomatological College, Peking University, 100081 Beijing, China |
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Abstract: | 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. |
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Keywords: | human enamel Beijing free electron laser synchrotron radiation X-ray fluorescence ablation element distribution |
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