EDS在刑侦（射击残留物）中的应用

2021/09/02   下载量： 0 次

方案摘要

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应用领域 公安/司法
检测样本 刑侦
检测项目 元素分析
参考标准 -

Using an automated scanning electron microscope (SEM) and energy dispersive X-ray spectroscopy (EDS) to find and positively identify gunshot residue (GSR), has been an accepted method for forensic applications for quite a number of years.

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has been demonstrated that due to the spatial resolution

of EDS, it would be favorable to use 15 kV acceleration

voltage instead of 25 kV for GSR analysis. It has also been

shown that the results of low count spectra of real GSR

particles yield similar results when using 15 kV compared

to 25 kV. High count spectra also show comparable results

for these particles. However, the differences in 25 kV and

15 kV can be attributed to the structure of the particles,

such as flat, hollow or small particles affecting results.

Furthermore, the inhomogeneous nature of GSR particles

adds to the complexity of result interpretation. The much

larger excitation volume when analyzing with 25 kV can

skew results of these particles even further.

Also, it has been shown, that when using a bulk sample

or standard with a known concentration, the new Opti-

Series-Fit Deconvolution and the standardless PB-ZAF

quantification in conjunction with a high resolution XFlash®

Detector, can in fact produce very reliable results at 15 kV,

matching the certified values.


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