Experimental evaluation of infrared photography as a rapid and effective technique for gunshot residue visualisation

Beavan, Edward (2016) Experimental evaluation of infrared photography as a rapid and effective technique for gunshot residue visualisation. BSc dissertation, University of Portsmouth.

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    Abstract

    Infared (IR) photography has demonstrated itself as a proficient forensic technique for the examination of documents, blood traces and the ageing of skin injuries. Nevertheless, its application to enhance the visualisation of latent Gunshot Residue (GSR) deposits is significantly under researched. Therefore, the aim of this research thesis was to evaluate the effectiveness of digital IR photography as a rapid and efficient technique for GSR visualisation.
    The Attestor Forensics Scene View BV800 viewing system was used to visualise GSR deposits produced by a Glock 17 9xl9mm and 9mm Luger ammunition, upon four different fabric types and at three firing distances of 50mm, 200mm and 1000mm.
    The results demonstrate that IR photography can produce comparable results to other more common GSR visualisation techniques, such as X-Ray Fluorescence Alternative Light Source and chemical tests, without the limitations of disturbing the samples structure or being obstructed by certain material types. Moreover, the proficiency of IR photography's visualisation allowed accurate measurements and diagrams to be produced, which demonstrated the deposits' morphological variations that occurred as the firing distance and target material changed. This facilitated the identification of characteristic features, upon which crime scene determinations, such as the firing distance, can be based. Nevertheless given this study's focus upon material targets and its utilisation of a limited number of distance variables, further research is required to effectively evaluate the visualisation proficiency of IR photography.

    Item Type: Dissertation
    Departments/Research Groups: Faculty of Humanities and Social Sciences > Institute of Criminal Justice Studies
    Depositing User: Jane Polwin
    Date Deposited: 19 Oct 2016 15:14
    Last Modified: 19 Oct 2016 15:14
    URI: http://eprints.port.ac.uk/id/eprint/22414

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