A Method of Analyzing and Inferring Shooting Distance of Domestic Standard Pistol

Abstract

The invention discloses an analysis inference method for the shooting distance of a domestic standard pistol. The method comprises the following steps that (1) reference samples are manufactured; (2) shooting residues are extracted; (3) film coating is conducted; (4) a scanning electron microscope conducts energy spectrum analysis on the shooting residues; (5) the shooting distance is inferred. The method comprises comparison of analysis results of the shooting residues of test fire experiments, experiment check material and test fire samples, combination inference of the shooting distance, and other links. The analysis inference method is high in sensitivity, objective and accurate, and has good application prospects in inference practice of the shooting distance of shootings.

Description

technical field [0001] The invention relates to the field of forensic science, in particular to a method for analyzing and inferring the shooting distance of a domestic standard pistol. Background technique [0002] In the investigation of cases or accidents such as gun crimes, suicides, misfires, and stray bullets, the problem of shooting distance estimation is often encountered. The inference of shooting distance is of great significance for scene analysis and reconstruction, case analysis, clear case nature, and narrowing the scope of investigation. [0003] Shooting distance refers to the flight distance of the bullet from the muzzle to the target. According to the size of the shooting distance, it can be divided into contact shooting, close shooting, short-range shooting, medium-range shooting, and long-range shooting. The amount and distribution range of shooting residues around the entrance are the main basis for inferring the shooting distance. Shooting residue is...

AI Technical Summary

Problems solved by technology

The geometric calculation method is mainly based on ballistic analysis, which is often restricted by various factors in practical application, and its application value is very limited; The visual inspection / microscopic observation method has disadvantages such as low sensitivity, large error, and poor reliability. The chemical chromogenic method improves the sensitivity of shooting residue detection. The method is simple and fast, and is currently the most commonly used method in the actual handling of cases. However, this method is susceptible to the interference of the material of the shooting object itself when displaying the shooting residue, and the shooting distance estimation mainly depends on the distribution pattern of the organic shooting residue, which is highly subjective, and the accuracy of shooting distance estimation is not high; Analytical methods, emission spectroscopy, neutron activation, micro-beam X-ray fluorescence spectrometry, gas chromatography / mass spectrometry and other instrumental analysis methods to infer the shooting distance are based on the quantitative analysis of the shooting residue around the entrance, and the sensitivity of these methods is much higher Based on visual inspection / microscopic observation and chemical color development, many scholars have conducted research on these methods, but some scholars have found that the number of shooting residues varies greatly when shooting with the same gun and at the same distance, and the reproducibility is poor. Instrumental analysis methods are widely used in actual case handling

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