The method of protection against forgery of banknotes, securities and documents

 

(57) Abstract:

The invention relates to the protection against forgery of banknotes, securities and documents. The invention allows to simplify and reduce the cost of protection against forgery of banknotes, valuable papers and documents while ensuring a high degree of security. The method of protection against forgery of banknotes, securities and documents consists in the introduction into the material of the protected object or applied to it a label, which use stable isotope of osmium-187 or its compound, and determining whether it is nuclear magnetic properties. Introduction to material of the protected object or drawing on it of a stable isotope of osmium-187 may be made in compounds, providing a constant orientation of the magnetic moments of the electron shells of the atoms of osmium-187. 5 C.p. f-crystals.

The invention relates to the protection against forgery of banknotes, securities and documents.

Currently, direct financial losses due to counterfeit banknotes, credit cards and securities make up a significant amount of that is due to the fact that the current level of computational, analytical and copying equipment allows you to play with tro the problem is in the case of mass products, for example, money when the cost of production and protection against forgery should be minimal. In addition, the label should quickly and easily be detected.

There are various methods of protection money and securities against forgery. A significant portion of them are methods of protection with the use of metal tags.

There is a method of protection of banknotes, in which the bill applied a special image with magnetic ink. The registration label is a magnetic detector [1] However, this method can be quite easily reproduced and imitated. In addition, the ink is exposed to abrasion during long-term operation of banknotes.

There is also known a method of protection securities fraud, which consists in pressing a paper strip of magnetic material. The definition of authenticity securities is also using a magnetic detector that registers the intensity of the magnetic field [2] However, this method is not reliable, because it does not exclude the possibility of forgery.

The aim of the invention is to simplify and reduce the cost of protection against forgery of banknotes, securities and document in the material of the protected object tag, the presence of which is determined by its magnetic properties, the label used stable isotope of osmium-187 or its compound, and determining whether it is nuclear magnetic properties.

Reliable protection in this case is provided by using as a label unique material, mastering the production of which requires a level of work that is available only to the state possessing nuclear technology, and in very small quantities. The cost labels directly on a separate bill insignificant due to the fact that in order to ensure error-free identification label requires very small amounts of material for application of the label.

The selection of isotopes of osmium-187 is a complex, expensive and lengthy process as well as other isotopes of heavy elements, such as tungsten, platinum, iridium, etc. But it osmium isotope allows to realize quite fast, cheap and reliable method of registration authentication on specific nuclear magnetic properties of isotopes of osmium-187.

Most preferred is the introduction of osmium in the amount of 5-20 μg, because the number of < 5 µg becomes due to the increase in the costs of protection securities from the fake.

The most preferable from the viewpoint of the convenience of detection reliability of protection against forgery is an introduction to the material of the protected object or drawing on it of a stable isotope of osmium-187, which is carried out in a chemical compound, providing a permanent magnetic orientation of the atoms of osmium-187.

In particular, chemical compound, providing a constant orientation of the magnetic moments of the electron shells of the atoms of osmium-187 is Fs when the content of osmium in the number 1-9 mol%, the Content of osmium-187 is chosen from the condition of providing sufficiently reliable detection.

Also chemical compound that provides a constant orientation of the magnetic moments of the electron shells of the atoms of osmium-187 is FeBO3Os.

A special case of the introduction of the isotope of osmium-187 in the material of the protected object is introduced by treating the material with an aqueous solution of osmium tetroxide-187.

The most preferred method of determining the presence of the isotope in nuclear magnetic properties is the registration of the isotope by the method of nuclear magnetic resonance.

The most simple process of introducing sawodny solution tetroxide osmium-187. This material osmium fixed in insoluble form and cannot be removed without destruction of the material.

For detection is used are known from the prior art NMR spectrometer, in which the orientation of the magnetic fields of the nuclei investigated material used superconducting magnets that create magnetic fields up to 20 Tesla. Superconducting magnets are the main part of the cost of the spectrometer.

The introduction of isotopes of osmium-187 in the form of osmium compounds with ferromagnetic substance allows to use the internal magnetic fields of the atoms of up to 500 T and more, because the interaction with the magnetic fields of the ferromagnetic magnetic fields of the atoms follow. This allows you to receive the signal of NMR (nuclear magnetic resonance), i.e., the effect of selective absorption of radiation of a certain radio frequency, without the application of strong external fields. Also a favorable feature of the OS is the fact that the nucleus has spin 1/2, and hence no electric quadrupole moment that allows you to get rid of electrical disturbances.

The simplest connection, allowing you to Orient the magnetic field of the nuclei of osmium-187 is FeOs with the contents of the Os from 1 who have been distinguished output signal of the detection, and accordingly, to reduce to 1000 times compared with the connection FeOs content of the isotope label is FeBO3Os. High gain signal in this case is associated with extremely low field magnetic anisotropy connection FeBO3Os.

These materials are bonded to the material of the protected object or entered into it in the form of a label (or labels) of any geometrical shape, for example, in the form of thin strips that can be carried out by any known method.

Detection in the case of use as the label of osmium compounds with ferromagnetic substance is also known methods. When the overlay generated by the instrument (detector) radio-frequency pulse /2 (out of phase with the magnetic moments of the nuclei) the spins of the nuclei "crumble". When the next pulse (in-phase) the spins of the nuclei are returned simultaneously to the main oriented state, which allows you to register so-called spinal echo. Detection is performed at the operation of the device only on the kernel of osmium-187 with the resonant frequency of 107.5 MHz.

Modern technologies allow to get the OS required for implementing the method quantities, for example, from registers icesto isotope, required for the introduction of a label directly into one bill or valuable paper and the simplicity of the technology introduction provides the possibility of applying the method on a large scale, for example, in the production of banknotes.

NMR methods for the detection of authenticity label ensures high accuracy and reliability of the method, it does not require complex and expensive equipment. Authentication can be carried out by the unit weight not exceeding 10 kg

1. The method of protection against forgery of banknotes, securities and documents, including an introduction to the material of the protected object or applying to a label control its availability on its magnetic properties, characterized in that the label represents the osmium-187 or its connection, and control the availability of the label is performed by the method of nuclear magnetic resonance.

2. The method according to p. 1, characterized in that the osmium-187 is introduced into the material in the amount of 5-20 mcg.

3. The method according to p. 1, characterized in that when introduced into the material of the protected object or applied to it a label take a chemical compound of osmium-187, providing a permanent magnetic orientation of the atoms.

4. The method according to p. 3 different ones the as chemical compounds of osmium-187 take FeBO3Os.

6. The method according to p. 1, characterized in that the introduction into the material of the protected object osmium-187 carried out by treating the material with an aqueous solution of osmium tetroxide-187.

 

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SUBSTANCE: safety paper has a layer characterized by variable optical properties, made semitransparent, with transparency from 20 to 80%, and provided with coloring agent composed of optically changeable pigments.

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