Standard Test Method for Primer Gunshot Residue Analysis by Scanning Electron Microscopy/Energy Dispersive X-Ray Spectrometry

Importancia y uso:

5.1 This test method is intended to be used by forensic laboratory personnel who are involved in the analysis of pGSR stubs by SEM/EDS (1, 5).

5.2 SEM/EDS analysis of pGSR is a non-destructive method that provides (6, 7) both morphological information and the constituent elements detected in individual particles.

5.3 Particle analysis contrasts with bulk sample methods, such as atomic absorption spectrophotometry (AAS) (8), neutron activation analysis (NAA) (9), inductively coupled plasma atomic emission spectrometry (ICP-AES), and inductively coupled plasma mass spectrometry (ICP-MS), where the sampled material is dissolved or extracted prior to the determination of total element concentrations, thereby sacrificing size, shape, and individual particle identification.

5.4 Automated analysis of pGSR involves some portion of the data collection being controlled by instrument software. The extent to which the SEM and EDS systems communicate and are integrated varies according to the manufacturers and the capabilities of the hardware/software.

Subcomité:

E30.13

Referida por:

E3307-24, E1732-24E01, E3391-24, E3284-23, E3309-21

Volúmen:

14.02

Número ICS:

11.020 (Medical sciences and health care facilities in general)

Palabras clave:

energy dispersive X-ray spectrometry; forensic science; gunshot residue; pGSR; scanning electron microscopy;