SU42718A1 - A device for comparing radiographs in radiographic studies of the structure of a substance by the method of comparison - Google Patents

Description

When used in X-ray studies of the structure of substances of the comparison method (Debye-Sherera X-ray diffraction patterns) measured using a glass ruler or comparator, the distance between the Debye rings on the X-ray pattern is usually plotted on millimetric paper on the x-axis and serves as bases perpendicular to the height ( ordinates) approximately or, in the case of preliminary photometry, are fairly accurately proportional to the intensities of the corresponding Debye rings. Such diagrams, drawn for each shot, are then compared to each other. This method has the following significant drawbacks: 1) almost complete non-applicability in the case of complex systems (two-component and more complex), since in this case the lines on the radiograph merge, sometimes giving only a dark background (even when using monochromatic radiation), and plotting diagrams in natural scale is practically impossible; drawing them on an enlarged scale leads to the fact that the error in measuring distances and drawing lines on millimeter paper exceeds the thickness of the lines and the distance between them, which makes it impossible to compare the diagrams; 2) low accuracy at nane (201)

intensity of intensity, usually determined by eye, and in this case all intensities are divided into only 3-5 categories (very weak, weak, medium, bright, very rich), depending on the quality of the X-ray image; 3) slow execution.

In order to avoid these drawbacks, an instrument is proposed based on the method of comparing radiographs, in which the two radiographs under consideration are spatially combined so that (after combining) the Debye rings of one radiograph serve as a continuation of the Debye rings of the other radiograph, resulting in their comparison presenting no difficulty.

In FIG. 1, 2, 3, and 8 depict an example of overlapping diagrams ;, FIG. 4-device for combining cross-sectional diagrams; FIG. 5, b and 7 parts of the device.

FIG. 3 shows an example of combining two radiographs — FIG. 1 (with the rings depicted by the dotted line) and FIG. 2- (solid rings) are aligned to the position of FIG. 3. A complete coincidence is obtained both in magnitude and in intensity of rings Nos. 1, 2, 3, 4, 5, b, besides which the radiograph of FIG. 2 has rings nos. 7, 8, 9, 10, 11. After recording the numbers of the matching lines, the X-ray pattern of FIG. 1 third, etc. In the case of a merge of lines or the presence of a dark background, a corresponding note is made in the compiled table.

The device for performing the method of spatial alignment of two radiographs consists (Fig. 4) of box A with two electric lamps B, divided into three parts, with two prisms glued together in the middle, open at the top. Radiographs and. l b are placed under the side faces of the double prism on the illuminated bottom of the milk glasses D. Half of the face area mnpq of both prisms (Fig. 5 and 7), i.e. the area mrsq, is covered with silver (silver layer is shown by dotted shtrikhovka), after which the prism are bonded with mnpq granules using Canadian balsam. All the rays falling on the silver layer of the prism / are reflected (as indicated in FIG. 6) up above the same prism, all

Rays passing past the silver layer are reflected up above the prism, //. The same happens with the rays going through a prism //. Thus, two radiographs are spatially aligned with those indicated in FIG. 8 way (top view). When moving radiographs, they can be compared along its entire length. In the case depicted in FIG. 8, coincide both in position and in intensity, of the Debye rings No. j42 7, 2, 5, 4, 5 of the roentgenogram and with the rings No. 7, 3, 4, 5, 8 of the roentgenogram b. Rings 2, 6, 7 radiographs of b represent a special system. If the latter coincides with the system of rings of a third radiograph with (with which we replace the radiograph a used), the results can be summarized in the following table indicating that the substance giving the radiograph b consists of a mixture of substances that gave a and c radiographs.

In this example, a very bright line No. 4 was made up of lines No. 3 and Ka 2 of medium brightness.

The subject matter of the invention.

A device for comparing radiographs in radiographic studies of the structure of substances by the method of comparing spatially combined radiographs, characterized by the use of two

glued rectangular prisms / and // with half silver plated glued edges intended to be reflected with a prism / half of the first and half of the second radiograph, and with a prism II - the remaining half of the radiographs applied to the hypotenuse granule of the prisms and illuminated by light sources . to the author's certificate of E.A. No. 42718

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