Method for identification of rifled firearms using neutron activation analysis

FIELD: weapons and ammunition.

SUBSTANCE: invention relates to the field of development and fabrication of custom made firearms and may be used for the identification of rifled barrels of small arms that are manufactured in small lots. A method consists in applying a coating onto the inner surface of rifled arms barrels and cartridge chambers. The coating provides penetration of a set of microelements into the lateral surface of a bullet while it passes through the barrel in the course of firing and identification of the arms using neutron activation analysis of the bullet and cartridge case surfaces. Moreover, the applied coating contains three metals with their radioactive isotopes half-life period not less than 5 days.

EFFECT: providing unambiguous indentification of rifled weapons.

2 cl

 

The invention relates to the design and production of a piece of fire rifles and can be used to identify units of rifled small arms manufactured in small batches.

Well-known classical method for identifying a rifle (Kustanovich S.D. Forensic ballistics. M: "Legal literature", 1956, p.24-27). According to a known method carried out comparing two bullets and two sleeves, one of which obviously westralian of the test weapons, and the other presumably westralian of the test weapons. The comparison is carried out in General by the number and width of traces of the fields of the grooves of the bullet, the direction and angle of inclination, and also by comparing the appearance of the shells, their typical scratches and defects. In addition, compare the shape and size of the individual tracks, the configuration of the projections and depressions, as well as their mutual arrangement - i.e. the elements inherent in the individual barrel and chambered rifle.

The disadvantage of this method should recognize the need for the expert ballista firearms (or bullets, or shells)that can be used as an element of comparison. In their absence, the examination cannot be performed.

There is also known a method of labeling a barrel rifled weapons (US, 175346, 1979). Proposed to be applied to the inner surface of the barrel rifled weapons additional marking elements, leaving traces on the pool, which can be identified as individual characteristics of the barrel rifled weapons.

The disadvantage of this method admittedly not take into account the impact of the additional marking elements on ballistic weapons, in addition, in this embodiment, the weapon cannot be identified by empty sleeve.

There is also known a method of labeling a barrel rifle (RU, patent 2148769, 2000), including the application of the inner surface of the barrel cover, ensuring the implementation of the set of chemical elements in the lateral surface of the bullet during its passage through the barrel during the shot, allowing by chemical analysis, as the surface of the bullet, and surfaces in contact with the bullet after firing, to determine the qualitative and quantitative composition of the established elements and, therefore, the trunk from which a shot was fired.

This method is not suitable for identification barrels of weapons, because there is currently not known how precise application on the internal surface coatings, in addition, in this embodiment, the weapon cannot be identified by empty sleeve.

The technical problem is echema by the present invention, is the possibility of marking a rifle, preferably produced in small batches.

The technical result in the implementation of the design is to ensure an unambiguous identification of the rifle as the pool and spent the sleeve.

To obtain the technical result of the proposed use of the method of identifying a rifle using neutron activation analysis, including the application of the coating on the inner surface of the barrel rifled weapons, ensuring the implementation of a set of microelements in the side surface of the bullet during its passage through the barrel during firing and subsequent determination of the qualitative and quantitative composition of the established elements of the cover, which identify the weapon, and in addition put on the surface of the chamber the same floor, consisting of three metals, the half-lives of radioactive elements which constitute not less than 5 years, and to determine the qualitative and quantitative composition of the coating using neutron activation analysis surface bullets and shells. Preferably with the implementation of the method pre-defined response from bullets and shell casings, obviously used when administering shots from each weapon, using recip is the config as a control. These bullet and the cartridge case is usually obtained from the implementation of control shot upon delivery to the customer instance rifled firearms.

Neutron activation analysis is based on measuring the energy of the radiation produced by neutron irradiation of isotopes of chemical elements.

The introduction of restrictions on the use of the method of "three metals, the half-lives of radioactive elements which constitute not less than 5 days" due to the following factors:

1. Currently known methods of vacuum deposition, including local, on the surface, including metal, various metal compositions containing two or more components.

2. Also known electroplating methods local application on the metal surface metal coatings containing impurities.

3. These coating methods allow to obtain a metal coating with different content of chemical elements (metals) in them.

4. The resulting composition of metals irradiated by neutrons provide a significant number of combinations of artificial radioactive isotopes, each of which allows to unambiguously characterize the composition of metals and, therefore, an instance of the rifle on which the specified com is azizia applied.

5. The indication of "half-life period of not less than 5 days" simplifies the analysis, since in this case the accuracy of the analysis is almost independent of the conditions of its implementation, including the amount of time between the processing of the sample, the neutron flux and detection response.

6. Use of standard equipment for neutron activation analysis, provides extensive implementation of the proposed method.

It was established experimentally by ballistic characteristics manufactured with the proposed identification labels barrels rifled weapons that the ballistics of the bullet is not changed, since the thickness of the coating is not more than 3 μm, however, the coating of such thickness ensures the application of trace metals in the said coating chamber and barrel, at least, and after 300 shots.

Hence, the weapon can be defined as the pool and used the sleeve.

In a preferred embodiment, the identification in the process of manufacturing firearms rifles preferably at prisciliano it at least one shot, and at least one sleeve is placed in a file (or database) of the manufacturer, as well as of the bodies of internal Affairs.

Specified firearms can be a Pisto is no, rifle or carbine.

Hereinafter the invention will be illustrated in the examples of its implementation.

1. On the inner surface of the barrel of the gun near the muzzle end by vacuum deposition using vacuum post struck a composition of three metals, calcium, vanadium and chromium. The half-lives of their radioactive isotopes respectively 164 day, 16,1 days and 27.8 days. The composition applied composition depends on the composition of the target, from which the produced spray, as well as from the target temperature. Practically the number of combinations of the three metals indefinitely. Similarly was coated on the surface of the chamber. The coating obtained was fixed on the surface of the barrel and chamber method of heating. Upon delivery to the customer of the gun made a control shooting. The surface of the bullets and shells were analyzed using neutron activation analysis. The results made in the filing Cabinet. Further, upon detection of the bullets and/or cartridge used an instance of the weapon can be set in the analysis of their surface by the method of neutron activation analysis and comparison of the obtained results with the data stored in the card file.

2. On the inner surface of the barrel of a sniper rifle near the chamber method for electroplating inflicted whom is ositio three metals, containing iron, zinc and strontium. The half-lives of their radioactive isotopes respectively 45 days 246 days and 50.6 per day. The composition applied composition depends on the composition of the electrolyte, which made the application, and the process conditions. Practically the number of combinations of the three metals indefinitely. Similarly was coated on the surface of the chamber. The coating obtained was fixed on the surface of the barrel and chamber method of heating. Upon delivery to the customer sniper rifle produced control shooting. The surface of the bullets and shells were analyzed using neutron activation analysis. The results made in the filing Cabinet. Further, upon detection of the bullets and/or cartridge used an instance of the weapon can be set in the analysis of their surface by the method of neutron activation analysis and comparison of the obtained results with the data stored in the card file.

The use of such design allows you to uniquely identify a firearm rifled guns.

1. The method of identification of rifles, including the coating on the inner surface of the barrel rifled weapons, ensuring the implementation of a set of microelements in the side surface of the bullet during its passage through the barrel during the shot and the subsequent determination of the qualitative and quantitative composition of the introduced elements, which identify the weapon, wherein the applied coating consists of three metals with half-lives of their radioactive isotopes of not less than 5 days, while the coating is additionally applied to the surface of the chamber, and to identify the weapons used neutron activation analysis of the surface of the bullets and shell casings.

2. The method according to claim 1, wherein the pre-determined neutron activation response from bullets and shell casings, obviously used when making a shot from a weapon, and use the result as a control.



 

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