Nishiwaki Yoshinori, Takekawa Tomohiro
Faculty of Education, Kochi University, 2-5-1 Akebono-cho, Kochi-shi, Kochi, 780-8520, Japan.
J Forensic Sci. 2019 Jul;64(4):1034-1039. doi: 10.1111/1556-4029.13974. Epub 2018 Dec 10.
The performance of synchrotron radiation X-ray fluorescence (SR-XRF) spectrometry for nondestructive discrimination of small fragments of automotive aluminum wheels was studied. Fragments (< 500 × 500 μm ) of 45 kinds of wheels were first analyzed by scanning electron microscopy-energy dispersive spectroscopy (SEM-EDS) and then by SR-XRF. Despite the Mg/Al intensity ratio being a useful identification index, SEM-EDS was not efficient enough because of the absence of other meaningful indicators of comparison. Conversely, pairwise comparison was conducted and a 92.9% identification was achieved via SR-XRF using 18-keV X-rays. Trace heavy elements in the high-energy region were detected by SR-XRF using 116-keV X-rays, and an 82.9% identification was obtained. Combined use of 18- and 116-keV X-rays allowed 98.2% identification. Hence, SR-XRF is a powerful tool for nondestructive discrimination of automotive aluminum wheels with high precision using trace elements in a wide energy region.
研究了同步辐射X射线荧光（SR-XRF）光谱法对汽车铝轮毂小碎片进行无损鉴别的性能。首先通过扫描电子显微镜-能量色散光谱（SEM-EDS）对45种轮毂的碎片（<500×500μm）进行分析，然后再用SR-XRF进行分析。尽管Mg/Al强度比是一个有用的识别指标，但由于缺乏其他有意义的比较指标，SEM-EDS的效率不够高。相反，进行了两两比较，使用18 keV X射线通过SR-XRF实现了92.9%的识别率。使用116 keV X射线通过SR-XRF检测了高能区域中的痕量重金属元素，获得了82.9%的识别率。联合使用18 keV和116 keV X射线实现了98.2%的识别率。因此，SR-XRF是一种利用宽能量区域中的微量元素对汽车铝轮毂进行高精度无损鉴别的强大工具。
