X-ray method of determining inclusion substance in inspected object from density and effective atomic number values

FIELD: physics.

SUBSTANCE: double-spectrum illumination mode with separate selection of signals arising from radiation absorption in a background substance and signals arising from radiation absorption in overlapping layers of the background substance and inclusion substances is executed, wherein the X-ray exposure procedure is carried out not in one but two mutually perpendicular geometric projections, which enable mutual quantitative comparison of the mass thickness of the inclusion in one of the projections with the value of the linear dimension of that inclusion in the other projection and determine density of the inclusion substance from their ratio.

EFFECT: high probability of detecting hazardous inclusions and significant reduction of the probability of false alarm.

3 cl, 1 dwg

 

The invention relates to the field of radiographic technique and can be used when checking Luggage, hand Luggage and other objects of control during customs and special inspection.

The main objective of the inspection is the reliable detection and discovery in the Luggage of materials and items prohibited for carriage by air transport and border crossing.

To solve this task we use the x-ray control method, including x-raying moving on the conveyor belt baggage transverse fan beam of radiation, the check has passed through the baggage radiation using a detector line, the amplification of signals of the detectors, their digitization and conversion of the digitized signals in a data processing system in black-and-white shadow x-ray image of the monitored Luggage.

In this case, the recognition of investments in the baggage happens on their x-ray shadow image. When this type of matter, from which the attachment is not defined and therefore it is impossible to distinguish hazardous substances from normal substances.

Closest to the proposed x-ray is the way to determine the substance of the attachments on the value of the effective atomic number, including the scanning of the inspected object by x-rays and recording rosedragon through the object radiation in spectral regions with different effective energy. When this seperate signals corresponding to the radiation passing through the background stuff, and signals due to absorption of radiation in the overlapping layers of background substances and substances attachments (Patent RU 2095795 C1 X-ray detection of the substance for its effective atomic number").

The splitting of the original spectrum radiation at two spectra with different effective energy is, basically, two ways of filtering. The first registration of the radiation passed through the controlled object is carried out by two detectors located one behind the other along the x-ray beam and separated by a filter (brochure of the firm HEIMANN "System HI-SCAN 10050 EDS"). The second way is to use a leaf filters, which are placed in front of each second elementary detector (Patent RU 2115914 C1 "X-ray television device").

The disadvantage of this method of determining the substance of the attachments on the effective atomic number is the inability to detect hazardous substances in effective atomic number, among many other substances of the same class with close values of the effective atomic number. Such household organic substances, such as water, sugar, leather and dangerous substances such as explosives, have very close values now what about the atomic number.

In addition, the value of the effective atomic number is calculated in General for the superposition of all substances along the path of x-rays through the object from the focus of the x-ray source to the corresponding detector. When the procedure of selection signals corresponding to radiation that has passed through the background material and through the combination of background and identifiable substances and when calculating the effective atomic number of the substance of the investment increases the error of its determination, which introduces additional difficulties in identifying substances attachments.

When inspecting baggage using odnorotornyj radiographic installations, the discovery of hazardous substances by the method of determining the substance of the attachments on the effective atomic number proved to be ineffective and lead to a large number of false alarms.

The purpose of the invention is to eliminate these disadvantages.

To enhance the detection of dangerous attachments and significantly reduce the likelihood of false alarms, it was necessary to find additional information about the properties of substances, of which made investments in baggage. This additional information is the data on the size-density substances attachments.

The method of calculating the density of a substance vlozeni is based on the procedure of x-ray in two mutually perpendicular projections. Figure 1 shows a diagram dvukhfraktsionnaya installation with two x-ray sources 1 and orthogonal detector 3 lines. Investment in the inspected object 2. When implementing the method of determining the density of a substance attachments independent methods are defined mass thickness attachments X and line thickness attachment L (geometric size) along the same direction defined by the geometry of the x-ray source-detector. On the basis of x-ray data obtained in vertical projection ("side view"), is the mass thickness of X. According to the horizontal projection ("top view") is determined by the linear size L. the Density of the investments is calculated by the formula ρ=X/L.

The essence of the invention lies in the fact that the definition of the substance of the attachment is carried out by an aggregate of two physical parameters: the effective atomic number and density of the substance attachments. For the specific attachment of the identification procedure consists in the following: a pair of measured physical parameters (effective atomic number and density) are automatically mapped to a database of these physical parameters for a wide range of household and hazardous substances and, if relevant, is displayed on the monitor screen of the name of the substance, its effective atomic and values of the density.

With this method of determining the substance of the investment in the inspected baggage reliably allocated investments of the most common explosives, which is a consequence of the higher density values explosives compared with the values of the densities of most household organic substances. For example, if the effective atomic number of household organic substances and explosives are very close (~7), the density values of such household organic substances, such as plastics, leather, soap, things of wool, cotton, synthetic fabrics, are not more than 1.2 g/cm3while most common explosives density greater than 1.4 g/cm3.

Thus, the method of detecting hazardous substances in baggage, based on the determination of effective atomic number and density of the substance attachments is significantly more effective in comparison with the known method for detecting substances on the value of the effective atomic number [1].

The inventive method has no analogues in the x-ray imaging and, therefore, meets the requirement of "inventive step".

The principle dwuhspiralna dvukhfraktsionnaya x-ray installation for the implementation of the proposed method is based on the following schema.

With the aid of the completion of the two x-ray sources in conjunction with a system of collimators in the vertical plane are formed two narrow fan-shaped x-ray beam. At some distance from the emitter, which depends on the geometry of the radiographic and size of the viewing aperture of the tunnel, in the area of the two fan-shaped beams installed multi-channel device for the recording of x-ray radiation. It consists of two detector lines (vertical and horizontal projections)for the recording of the radiation inside the inspection chamber, amplification and generation of analog signals. Each line consists of detecting units, each of which includes a detector modules. The detector module is a set of elementary detectors of x-ray radiation, each of which is an opto-isolator scintillator + photodiode. Between the emitter and the detector line is a transport system for moving a controlled object. After the inclusion of the transport system and the intersection of the front edge of the test object line fotobureau are measured and stored dark current of all detectors, and after activation of the exposure x-ray generators are measured and stored currents of all of the detectors in the absence of an object, which are used for normalization of the signals of the detectors.

With the passage of the controlled object through a plane radiographic p is oshodi amplification of analog signals of the detectors, their digitization and conversion of the digitized signals in a data processing system in shadow and color matrix image controlled baggage with the view on the screens of the monitors in the "on-line". Black and white shadow image is displayed on the screen of the left monitor. On the screen right monitor displays a color image. Vertical projection (side view) of the inspected object is placed at the top of your screen. The horizontal projection (top view) of the inspected object is placed in the bottom of the work screen.

A color image is displayed using a palette of 3 colors, each color is assigned a specific range of values of the effective atomic number and therefore the group of substances:

orange color corresponds to a group of organic substances,

green color corresponds to the group of light metals (like aluminum),

blue color corresponds to a group of metals of the type of iron and copper.

The developed identification function is intended for analysis of objects during visual analysis of black and white and color images have been recognized by the operator of potentially hazardous.

How do I use the function identification: with the cursor on the shadow image of the vertical projection of the object is selected background ovarian cancer is the ohms with a suspicious attachment; moving the cursor with the upper boundary of the attachments to the bottom, select the rectangular area in the image vertical projection attachments; on the screen there are two vertical lines crossing both the projection of the inspected object; using the cursor on the shadow image of the horizontal projection is selected background region near the suspicious attachment; moving the cursor to the upper boundary of the image attachments in horizontal projection to the bottom, select the area of the rectangular shape; after these manipulations, the function automatically calculates the average values of density and effective atomic number of the selected investments, and error calculations.

As a result of applying functions to identify the measured effective atomic number and density attachments are automatically mapped to a database of these physical parameters for a wide range of household and hazardous substances and, if relevant, is displayed on the monitor screen displays with the name of the substance, the values of its effective atomic number and density, and tolerance calculations.

The use of the proposed method can detect prohibited and hazardous substances in baggage x-ray inspection during customs or special inspection, which will significantly improve the safe is the air transportation industry.

1. X-ray detection method according to the magnitude of the effective atomic number of the substance of individual attachments in the inspected object based on the use of dvuhsektsionnogo mode x-ray emitting signals separately, due to the absorption of radiation in the background, substance, and signals due to absorption of radiation in the overlapping layers of background substances and substances attachments, characterized in that the procedure of x-ray is not in one but in two mutually perpendicular geometric projections, allowing mutual quantitative comparison of the mass thickness of the attachment in one of the projections with the value of the linear size of the attachment in a different projection, and their relation to determine the density of substances attachments.

2. The method according to claim 1, characterized in that the selection of investments is carried out on a total of two physical parameters: density and effective atomic number.

3. The method according to claim 2, characterized in that for the specific attachment of the identification procedure is carried out by automatic matching pairs found physical parameters, i.e. the effective atomic number and density, with elements of a data Bank, obtained in the same conditions, x-ray inspection and characterizing diversity bytovuhi unauthorized substances.



 

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