Wong Y S
Scan Electron Microsc. 1982(Pt 2):591-7.
Scanning Electron Microscopy - Energy Dispersive X-Ray Analysis (SEM/EDX) has been applied in casework for more than a year in the Forensic Division, Government Laboratory of Hong Kong. The types of samples being analysed are summarised and three cases of scientific interest are described. The first case applies SEM/EDX to characterize microscopic gold particles recovered from clothing of suspects involved in goldsmith robberies. Both elemental and morphological results obtained were used as supporting evidence. The second case describes the three types of beaded ends on fibres found in a single cloth sample. These beaded ends are different in shape and surface features and can be used as an additional parameter in fibre identification. The final case shows the application of vacuum evaporation of graphite on a document sample to reveal the area of paper which has been skillfully mechanically erased. Both the image intensity and the composition of the ink are used to differentiate between original and altered characters on the document.
扫描电子显微镜-能量色散X射线分析（SEM/EDX）已在香港政府化验所法医科的案件工作中应用了一年多。总结了所分析样本的类型，并描述了三个具有科学价值的案例。第一个案例应用SEM/EDX对从参与金匠抢劫案嫌疑人衣物上回收的微观金颗粒进行表征。所获得的元素和形态学结果均用作辅助证据。第二个案例描述了在单个布料样本中发现的纤维上的三种串珠状末端。这些串珠状末端在形状和表面特征上有所不同，可作为纤维鉴定的一个附加参数。最后一个案例展示了在文件样本上真空蒸发石墨以揭示被巧妙机械擦除的纸张区域。图像强度和墨水成分均用于区分文件上的原始字符和更改后的字符。
