在纵火调查中轻微的热损伤毛发的歧视
Peibin Wang1, Jing Jin2, Zhengzhe Zang1
1School of Graduate, China People's Police University, Langfang 065000, China.
Science & justice : journal of the Forensic Science Society
|September 14, 2024
概括
使用扫描电子显微镜 (SEM) 分析头发的轻微热损伤可以识别火灾现场接触. 这种方法有助于证实纵火嫌疑人通过检测微观的热引起的变化在头发轴.
科学领域:
- 法医科学 法医科学 法医科学
- 材料科学 材料科学 材料科学
背景情况:
- 在纵火调查中,确定与火源的密切接触至关重要.
- 头发微妙的热损伤可以表明火的接近,但往往很难检测到.
研究的目的:
- 建立一种检测头发轻微热损伤的方法,以识别火灾现场接触.
- 分析模拟火灾条件下的头发的热行为和形态变化.
主要方法:
- 使用圆热量计来模拟火灾现场的辐射热暴露.
- 检查黑头发样本的热降解和形态变化.
- 使用扫描电子显微镜 (SEM) 和光学显微镜 (OM) 进行分析.
主要成果:
- 头发蛋白质降解在240°C以上开始,导致微裂.
- SEM检测到热损伤的微裂,在OM下看不见.
- 轻微的热损伤主要在头发轴上观察到,而不是尖端,特别是在短时间曝光时.
结论:
- 对头发轴的微观分析可以揭示轻微的热损伤,表明火灾现场附近.
- 热损伤的存在和严重程度随着温度的增加而增加.
- 这种方法为确认纵火嫌疑人提供了有价值的证据.
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