| 光谱学与光谱分析 |
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| Application of Confocal Micro-Beam X-Ray Fluorescence in Nondestructive Scanning Analysis of the Distribution of Elements in a Single Hair |
| LIU He-he, LIU Zhi-guo, SUN Tian-xi*, PENG Song, ZHAO Wei-gang, SUN Wei-yuan, LI Yu-de, LIN Xiao-yan, ZHAO Guang-cui, LUO Ping, DING Xun-liang |
| The Key Laboratory of Beam Technology and Material Modification of the Ministry of Education, Beijing Normal University, College of Nuclear Science and Technology, and Beijing Radiation Center, Beijing 100875, China |
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Abstract The confocal micro X-ray fluorescence (XRF) based on polycapillary X-ray lens and conventional X-ray source was used to carry out the scanning analysis of the distribution of the elements in a single hair. The elemental distribution in the single hair was obtained. In the confocal micro XRF technology, the output focal spot of the polycapillary focusing X-ray lens and the input focal spot of the polycapillary parallel X-ray lens were adjusted confocally. The detector could only detect the X-rays from the overlapping foci. This confocal structure decreased the effects of the background on the X-ray spectra, and was accordingly helpful for improving the accuracy of this XRF technology. A polycapillary focusing X-ray lens with a high gain in power density was used to decrease the requirement of power of the X-ray source used in this confocal technology, and made it possible to perform such confocal micro XRF analysis by using the conventional X-ray source with low cost. Experimental results indicated that the confocal micro X-ray fluorescence based on polycapillary X-ray lens had potential applications in analyzing the elemental distribution of individual hairs.
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Received: 2013-02-24
Accepted: 2013-04-18
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Corresponding Authors:
SUN Tian-xi
E-mail: stx@bnu.edu.cn
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