ABSTRACT: Selected aspects of examinations of inorganic gunshot residues arising
fromuse of P-64 or P-83 pistols andMakarov 9mmammunition are presented in the
work. The subjects of the study were: seven sets of samples collected from shooters’
hands directly after performing various numbers of experimental shots,with the use
of different self-adhesive materials; and three sets of evidence material concerning
gunshot cases examined in the Institute of Forensic Research, Cracow. All the sam-
ples were analysed with the SEM-EDX method using an automated program of
searching for defined features. The total number of particles found was different for
each of the studied sample sets. However, for each set a similarity in proportions of
numbers of particles of certain elemental contents was observed. It was found that,
among the entire population of particles originating from the primer, the most nu-
merous group was that of indicative antimony particles, whereas unique Pb-Sb-Ba
particles occurred in very small numbers. These facts should be taken into account
when formulating an expert report in cases of finding only indicative particles. It has
been proposed that in such cases conclusions should be drawn with the use of a prob-
ability scale. Repeatability of the results obtained for the experimental samples as
well as their similarity to the selected evidence samples was checked by means of
non-parametric statisticalmethods: R-Spearman and t-Kendall rank correlation co-
efficients.
ABSTRACT: Selected aspects of examinations of inorganic gunshot residues arisingfromuse of P-64 or P-83 pistols andMakarov 9mmammunition are presented in thework. The subjects of the study were: seven sets of samples collected from shooters’hands directly after performing various numbers of experimental shots,with the useof different self-adhesive materials; and three sets of evidence material concerninggunshot cases examined in the Institute of Forensic Research, Cracow. All the sam-ples were analysed with the SEM-EDX method using an automated program ofsearching for defined features. The total number of particles found was different foreach of the studied sample sets. However, for each set a similarity in proportions ofnumbers of particles of certain elemental contents was observed. It was found that,among the entire population of particles originating from the primer, the most nu-merous group was that of indicative antimony particles, whereas unique Pb-Sb-Baparticles occurred in very small numbers. These facts should be taken into accountwhen formulating an expert report in cases of finding only indicative particles. It hasbeen proposed that in such cases conclusions should be drawn with the use of a prob-ability scale. Repeatability of the results obtained for the experimental samples aswell as their similarity to the selected evidence samples was checked by means ofnon-parametric statisticalmethods: R-Spearman and t-Kendall rank correlation co-efficients
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