SU934247A1 - Method of determining the time of shot at forensic ballistic examination - Google Patents

Description

The invention relates to forensic examination to establish the duration of the shot.

There is a method of establishing the prescription of a shot during forensic ballistic examination by determining gaseous nitrites in tan from a barrel of a weapon using the Griss-Ilosvay reagent tD.

The disadvantage of this method is the inaccuracy of establishing the limitation of the shot.

This goal is achieved by the fact that according to the method of establishing the limitation of the shot during forensic ballistic examination by quantifying gaseous nitrous oxides, determining gaseous. of nitro compounds are carried out in a folder case of the tested weapon, then ammunition cartridges of a similar caliber are fired and the number of gaseous nitro compounds in the fired folder cases is determined during the time necessary to equalize the concentrations of gaseous nitro compounds in the studied and fired cartridge cases, and the time of exposure is determined time left for their equalization.

P r and m er. The following intensities of the bands on the scans were obtained for the test sleeve: 40 units, 39 units, 39 units. The measurement was carried out using reflective spectrophotometry on a KM-3 chromatogram spectrophotometer of the company ’’ Opton ”(Germany) at a wavelength of 519 nm, with the Griss-Ilosvay reagent.

At the same time, five folder cartridges of the same caliber were fired to obtain five folder cartridges, the study of which was carried out in a similar way.

On the first day of shooting, the intensity of the stained spots on the indicator in the control sleeves is:

112 units; 111 units; 111 units; 110 units;

111 units

On the second day after the shot, the intensity decreased to 72 units; 71 units; 70 units ί 72 units ” 71 units 5

On the third day after the shot, the intensity of the stained spots in the indicator: 58 units; 57 units; 5b units, 57 units; 56 units

On the fourth day after the shot:, ⁰ 40 units .; 39 units; 38 units; 39 units;

units

On the fifth day: 29 units.; 27 units;

units; 28 units; 28 units

Comparing the intensity of the ¹⁵ colored spots on the indicators for the control and the test sleeves, a coincidence of intensities was found corresponding to the fourth day that has passed since the shooting of the control sleeves.

As a result, it can be argued that the shot was fired four days before the start of the study.

The proposed method is simple and ensures a high accuracy in determining the duration of the shot.

Claims (1)

This invention relates to a forensic ballistic examination to establish the duration of a shot. There is a known method of establishing the limitation of a shot during a forensic ballistic examination by determining gaseous nitrites in a deposit from the bore of a gun with the help of the Griess-Ilosa GP reagent. The disadvantage of this method is the inaccuracy of the determination of the age of the shot. The goal is achieved by the fact that according to the method of establishing a shot’s time in a forensic ballistic examination by quantifying gaseous nit (decompression, the determination of gaseous nitro compounds is carried out in a folder of the test, then the bullets of a similar caliber are shot and the shotgun sleeves are detected the amount of gaseous nitro compounds of the Scientific Research Institute for the time required to equalize the concentrations of gaseous nitro compounds in the studied and the spent cartridges and the time of shot are determined by the amount of time spent on equalizing them. Example: For the test case, the following band intensities were obtained on scans: kO unit, 39 unit, 39 unit. using reflective spectrophotometry on an Opton KM-3 chromatogram-spectrophotometer (Opton Germany) at a wavelength of nm, with Griess-Ilosv reagent. Simultaneously, shooting of five folder cartridges of the same caliber was carried out to produce five folder shells, the study of which was conducted in a similar way. On the first day of the shooting of intensive Hocjb painted indiciaT-Ooe stains in the control sleeves, it is equal to: 393,112 units; 111 units; 111 units; 110 items; 111 units On the second day after the shot, the intensity dropped to 72 units; 71 units; 70 units, 72 units | 71 units On the third day after the shot, the intensity of the painted spots in the indicator: 58 units; 57 units; 5b units, 57 units; 56 items On the fourth day after the shot: kQ units; J9 unit; 38 units; 39 units; 39 units On the fifth day: 29 units; 27 items; 27 items; 28 items; 28 items I compared the intensity of the stained spots on the indicators for the control and test sleeves, we found a coincidence of the intensities corresponding to the fourth day after the shooting of the control sleeves. As a result, it can be argued that the shot was fired four days before the start of the investigation. The proposed method is simple and provides high accuracy of setting the shot's duration. Claims The method of establishing a shot's time in a forensic ballistic examination by quantifying gaseous nitro compounds, characterized in that, in order to improve the accuracy of the method, the determination of gaseous nitro compounds is carried out in a folder of the test weapon, then a weapon of a similar caliber is shot, and shooting is performed. The amount of gaseous nitro compounds is determined in these folder sleeves for the time necessary to equalize the concentrations of gaseous The nitro compounds in the test and shot sleeves, and the time of shot duration are determined by the amount of time left to equalize them. Sources of information taken into account during the examination 1. A. Kogan. Nitrites in soot Problems of crimson after shot. nalistiki. M., with. 65-66.