445nm和532nm激光探测对微量DNA降解的影响  

Effects of 445 nm and 532 nm laser detection on DNA degradation of trace evidence

作　　者：阮成龙 聂世昌 邓党军[2] 邹勇[3] Ruan Chenglong;Nie Shichang;Deng dangjun;Zou Yong(Institute of Forensic Science,Chongqing Yongchuan Public Security Bureau,Chongqing 402160,China;Institute of Forensic Science Chongqing municipal Public Security Bureau,Chongqing 400700,China;College of Landscape Architecture and Life Science,Chongqing University of Arts and Science,Chongqing 402160,China)

机构地区：[1]重庆市永川区公安局物证鉴定所,重庆402160 [2]重庆市公安局物证鉴定中心,重庆400700 [3]重庆文理学院园林与生命科学学院,重庆402160

出　　处：《中国法医学杂志》2020年第3期321-323,共3页Chinese Journal of Forensic Medicine

基　　金：重庆市公安局科技攻关项目(G2016-18)。

摘　　要：目的为更好的发掘可见波段激光在刑事技术中的应用价值。方法我们以载玻片上汗潜指印和牛皮纸上稀释唾液斑为研究对象,选取不同激光照射时间、不同照射距离为变量,较为系统的探究445nm和532nm激光探测对微量生物物证DNA降解的影响。结果研究结果表明,对于反光性较强的非渗透性客体,应采用较近距离,持续照射时间1min以内的激光探测微量生物物证;而吸光性较好的渗透性客体,可采用20cm以上较远距离,持续照射时间不超过10min以内的激光下探测。Objective To explore better application of the visible wave laser in criminal technique.Methods we took sweat latent fingerprint on slide and diluted salivary plaque on kraft paper as research object,and deeply studied the effects of 445 nm and 532 nm laser detection on DNA degradation of trace biological evidence by setting different laser irradiation times and different irradiation distances.Results The results showed that for non-osmotic carrier with strong reflectance,the trace evidence should be detected by laser within 1 min of the time of irradiation and short distance;for osmotic carrier with better light absorption,the trace evidence can be detected by laser with a long distance above 20cm and a continuous irradiation time of no more than 10 min.

关 键 词：刑事犯罪现场 微量物证 445nm激光 532NM激光 DNA降解 

分 类 号：DF795.1[医药卫生—法医学]