Device for formation of directed bundle of x-rays

FIELD: physics.

SUBSTANCE: invention concerns resorts for formation of a directed bundle of a X-rays from a divergent bundle created by the point or quasi-point source. The device for formation of a directed bundle of X-rays contains a catopter in the form of a surface of gyration and has a focal point. The focal point is located on an axial line of the specified surface of gyration. Forming surfaces has the curve shape. The tangent to the specified curve in any point of this curve forms with a direction on a focal point the same angle. This angle does not exceed a critical angle of the full exterior reflexion for X-rays of the used range. The catopter is or an interior surface of the shaped tubular device or a surface of the shaped channel in a monolithic body, or boundary between the surface of the shaped monolithic core and a stratum of the coat superimposed on this core. The specified tubular device or the channel is executed from a material reflecting X-rays or has a coat from such material. The specified core is executed from a radiotransparent material. The specified coat of the core is executed from a material reflecting X-rays.

EFFECT: increase of radiation source angle capture.

8 cl, 9 dwg

 

The invention relates to the field of technical physics, namely the means for forming a focused x-ray beam from a diverging beam generated by a point or quasidecadal source.

The known device the specified destination, representing the x-ray lens that contains many (up to hundreds of thousands) of the channels (capillaries to transport the x-ray radiation using the phenomenon of total external reflection (U.S. patent No. 5192869, publ. 09.03.93 [1]; the patent of Russian Federation №2164361, publ. 20.03.2001 [2]). Such devices have good performance, however, difficult to manufacture, requiring execution of a large number of manual operations.

Therefore, along with the improvement of devices of the specified type continues to develop and more simple devices that contain a small number (one or more) channels. Thus, the known device containing a reflecting surface, which is the inner side surface bounding a solid of revolution, the generatrix of which is a straight line. In the device according to European patent No. 0244504 (publ. 27.10.1993 [3]) 0244504 (publ. 27.10.1993 [3]) reflecting surface has a cylindrical shape, in the device according to U.S. patent No. 5,101,422 (publ. 31.03.1992 [4]) - shape tapering towards the exit cone, the device is as under the patent of the Republic of Belarus No. 3662 (publ. 30.12.2000 [5]) - shape widening toward the exit cone.

For devices [3]-[5] characterized by small angle capture of x-ray radiation. Angle capture refers to the solid angle from which the device can "build" the divergent radiation source to be converted into a directional beam. For these devices capture angle is a cone with the angle at the vertex, not exceeding 2Θkrwhere Θkrcritical angle of total external reflection. This is because the radiation included in the device at an angle of more than Θkrto its longitudinal axis (which is the axis of rotation forming a given surface), cannot pass to the output, whether directly or as a result of reflection from said surface. Next, as a measure of the angle of capture will be considered the angle at the apex of the said cone.

It is also known a device for U.S. patent No. 5,768,339 (publ. 16.06.1998 [6]). This device also includes a reflective surface, which is the inner side surface of the restricting body rotation. While forming this surface is a parabola, the focus of which is located on the axis of rotation. When using the device point or quasiequity the radiation source must be aligned with this point. Analysis of the principle Dunn is the first device shows his capture angle, understood in the above sense, is 4Θkr. This is because in accordance with the properties of the paraboloid of revolution of the beam emanating from the focus after reflection has a direction parallel to the axis of rotation. At the same time, the reflected beam forms with the incident beam emanating from a focus, angle, not exceeding 2Θkr(since the rays incident on the reflective surface at an angle of more than Θkrcannot be reflected from it). Therefore, the angle between the outgoing of the focus beam is able to be reflected, and the axis of rotation is also less than 2Θkr. But this angle is half full angle of capture, i.e. the last is 4Θkri.e. two times more than the devices known from patents [3]-[5]. However, this angle remains small compared with the angle of capture devices [1], [2], made in the form of a capillary lens.

The present invention aims to obtain a technical result consists in increasing the capture angle of the radiation source.

The known device according to the patent [6] is the closest to the proposed invention.

Apparatus for forming a focused x-ray beam according to the present invention, as the closest known from the patent [6], contains a reflecting surface in the form of surface the displacement of rotation and has a focal point, located on the centerline of the specified surfaces of revolution.

To achieve the technical result of the proposed device, in contrast to the closest known for forming the indicated surface of the rotation has the form of a curve, the tangent to which at any point of the curve forms with the direction specified on the focal point to the same angle not exceeding the critical angle of total external reflection of x-rays used range. This reflecting surface is on the inside or on the surface of the profiled tubular element made of reflective x-ray radiation material or coated with such a material or surface shaped channel in a monolithic body made of reflective x-ray radiation material or have a coating of such material on the surface of the specified channel, or the border between the profiled surface of the monolithic rod of radiolucent material and a layer deposited on the terminal cover from the reflected x-ray radiation material.

This form forming a reflective surface for any point there is able to be reflected beam emanating from the focal point. In other words, there is no such napravlyayuschego beam, at which he could be affected, which explains the possibility of increasing the angle of capture. Radiation as it approaches the exit of the device, again reflecting more "pressed" to the reflective surface, and after leaving it formed a directed beam of focused radiation. While the presence of the described implementations of the reflective surface allows for use in the manufacture of devices of various manufacturing techniques ensure compliance with the conditions applicable to the form of this surface.

In the particular case of the execution device, the angle between the axis of rotation and the direction of the focal point in the most remote from her point specified curve is less than the specified angle between the tangent to the curve at any point and direction to a focal point. When this condition is generated by the beam will be neroshowtime.

The device can be designed in such a way that the tangent to this curve at its end point, the most remote from the focal point that is parallel to the centerline. In this case, there is provided a beam of output radiation, almost parallel to the longitudinal axis of the device, coincident with the said axis of rotation (deviating from this axis is not more than the angle Θkr).

The proposed device can additionally is to contain one or more reflective surfaces, coaxially nested in the specified. For each of these additional surfaces must be in the specified condition related to the angle between the tangent to the generatrix curve, which is the generatrix of the surface, and the direction of the focal point. In this embodiment of the device which forms the beam, the intensity distribution of the radiation in which more evenly.

The device may further comprise a reflective surface, symmetric specified reflective surface relative to the plane perpendicular to the said axial line and passing through the specified end point at which the tangent to this curve is parallel to the centerline. In this case, the device can generate a focused beam, symmetrical capture device input beam and converging at a point on the longitudinal axis symmetrically focal point.

In the latter case, between two specified symmetric with respect to each other reflecting surfaces may be located coupled with them cylindrical reflecting surface. This design implementation creates additional technological capabilities, in particular, allows to obtain the desired overall length of the device.

To meet the proposed device with one or a few is Kimi coaxially nested additional reflecting surfaces, each reflecting surface can be paired with a cylindrical reflecting surface part, in which the end point of the generatrix is parallel to the centerline.

The present invention is illustrated in the drawings figure 1-6, on which the device is represented schematically, and Fig.7-9, which shows the different possible cases of its implementation:

- figure 1 is a longitudinal section of the device when it has a single reflecting surface;

- figure 2 - the device of figure 1 and the distribution of intensity of radiation at its output beam;

- figure 3 is a device with an external reflecting surface similar to the one shown in figure 1, and it invested in the reflective surface, and the distribution of the radiation intensity of the output beam of the device;

- figure 4 is a device containing a reflective surface, shown in figure 1, associated with symmetric her surface;

- figure 5 is a device similar to the one shown in figure 4, but having a cylindrical insert between the symmetrically arranged reflecting surfaces;

- figure 6 is a device similar to the one shown in figure 3, but having cylindrical portions associated with each of the reflecting surfaces;

- 7 - performance device in the form of a profiled thin-walled tubular element, the inner side which plays the role of the reflective surface;

on Fig device, in which the reflecting surface is the surface of the channel made in the monolithic body;

- figure 9 - the device is a monolithic shaped radiolucent rod, covered with reflective material, the boundary of which with the surface of the rod is a reflecting surface for x-rays.

The proposed device has (1) a reflecting surface as a surface of rotation of a body. Forming this body rotation has the form of curve 1 (hereinafter the designation 1 is used in the text for the reflective surface as it intersects with the plane of the drawing along the line 1). The tangent to the curve 1 at any point (see, for example, points P1, R2, R3; to avoid cluttering the drawing, curve 3 shown only for P1) forms with the direction of the focal point F (for P1such a direction indicated 9)lying on the axis 2 of rotation, the same angle α. The axis 2 is also the longitudinal axis of the device and its optical axis. In this case the angle α does not exceed the critical angle of total external reflection of x-rays used range (i.e. α≤Θkr). Due to this condition, any beam spot or quasiconcave source location is defined at the focal point F, under the reflective surface 1 may be reflected. In the lower part of figure 1 shows two such beam - X4and X5reaching the reflective surface at the points R4and R5. The reflected beam of X41then again reaches the reflecting surface at the point R6. It is possible to show, on the basis of the above properties forming of surface of rotation 1, the angle between the beam of X41and the tangent plane to this surface at the point R6will be less than in the preceding point R4. Therefore, this beam is also reflected in the form of a beam of X42but at a smaller angle than its parent beam of X41. In other words, as a result of successive reflections of the beam more "pressed" to the reflective surface. The scale of the drawing does not show a large number of reflections, so figure 1 rays X51and X42leave the device, leaving it through the left edge.

In the described processes is formed by a directional beam of radiation, most of which is concentrated near the surface of a cone or cylinder, depending on the direction of the tangent to the reflecting surface in the vicinity of the output device, i.e. at the point most remote from focal.

If the output facet of the device corresponds to the line in figure 1, connecting the points R0The p 6in which the tangent to the curve 1 is parallel to the axial line 2 (this tangent 4 shows point P0)provides a quasiparallel beam of output radiation, deviating from the longitudinal axis 2 of the device is not more than the angle α≤Θkr. The shape of this beam is close to cylindrical. The intensity distribution of the radiation in the beam along its diameter has the form shown in the left part of figure 2. In the peripheral part of the distribution beyond the lateral dimension of the device, which due to passing on the output side of the source radiation propagating in the interval of angles ±α without reflection from the surface 1. The maximum intensity portion of the beam close to its periphery, is the result of the above-mentioned "cuddling" radiation to the reflective surface. In the Central part of the beam intensity is again small, because (as on the periphery of the beam) direct passage to the output of the radiation source without concentrating the radiation reflective surface.

If the output facet of the device is to the left of the line connecting points P0and R6in which the tangent to the curve 1 is parallel to the axial line 2 (the part of the curve 1 to the left of point R0and R6shown in figure 1 by the dotted line), the beam is formed, on the main part of the radiation which is concentrated within a tapering cone. The intensity distribution of the radiation in the beam along its diameter is similarly shown in the left part of figure 2.

In both the above cases, the angle between the axis 2 of rotation (longitudinal axis of the device) and the direction from the focal point F in the most remote from her point specified curve does not exceed the angle α between the tangent to the curve at any point and direction to a focal point. For example, if end (farthest from the focus point is shown in figure 1, the point P0it is the equality of the angle between the direction of this point from the point F and the axis 2. This angle (angle α between axis 2 and the inclined dashed line) is shown in Fig 1. The same condition is performed to point R6. For any curve point 1, located to the left of point R0and R6(this part of the curve 1 shown in figure 1 by the dotted line), discussed the angle will be less than α. In other words, the execution of the considered conditions for the present angle ensures that the output beam will be neroshowtime, i.e. close to the cylinder or cone that tapers as the distance from the output device.

If the output facet of the device is to the right of the line connecting points P0and R6in which the tangent to the curve 1 is parallel to the axial line 2, is formed beam, the main part of the radiation motorolasecretcode within the expanding cone. The intensity distribution of the radiation in the beam along its diameter also similarly shown in the left part of figure 2.

Figure 1 shows the angle 1/2 ϕ3- half of the angle of capture. As can be seen from the above explanation and drawing, this angle depends on the distance between the focal point F and the input (right of figure 1) by the end of the device: the smaller this distance, the greater the angle of capture. Therefore, restriction of a fundamental nature, to increase the angle of capture does not exist. Theoretically, the angle of capture could be even more than 2π steradian, but this would place a point source at the focal point inside the unit (to the left of its right edge).

In practice, the reduction of the distance between the focal point F and the right edge of the unit may be hampered by the fact that at an acceptable size and the ratio of these dimensions to each other above-mentioned distance and radius R2the input end are very small. However, can actually be obtained capture angle substantially in excess of the maximum achievable angle of the grip closest to the known device according to the patent [6].

For example, when the ratio of the radii of the output and input ends of R1/R2=11 (for example, R1=11 μm, R2=1 μm) angle capture ϕ3≈10Θkri.e. 2.5 RA is and more than in the device according to the patent [6]. This allows more than 6 times (2,52to improve the use of energy source.

Above was marked by the uneven distribution of the radiation intensity along the diameter of the output beam of the device of figure 1. In most practical problems require radiation of high brightness in a very "thin" beam, this feature is not significant negative factor. But if you want to obtain more uniform distribution of the radiation intensity in the beam, the device can be equipped with additional reflective surfaces, nested depicted in figure 1, as shown in figure 3, where such nested surfaces are surfaces 11 and 21 of the coaxial outer surface 1. For each of the sub-surfaces must be performed the same conditions as for the outer surface 1, including the condition of parallelism of the tangent at one of the end points of the centerline (longitudinal axis of the device) 2. Therefore, shown in figure 3 endpoints P0, 23, 33 must be on the same straight line 6 passing through the focal point F and forming with the axial line 2 angle α≤Θkr.

In the device according to figure 3, each of the reflecting surfaces 1, 21, 31 captures a part of the radiation beam source, which is captured by devices which m of figure 1. Each of them forms a beam with a maximum intensity in its peripheral part. Therefore, the total distribution of the radiation intensity of the output beam of the device has the appearance shown in the left part of figure 3.

For forming a focused beam, symmetrical capture device input beam, the proposed device is performed in accordance with figure 4. In this case, it further comprises a reflecting surface 11, symmetric reflective surface 1 relative to the plane 5, perpendicular to the centerline 2 and passing through the end point of the P0, in which the tangent 4 generatrix of the surface of rotation 1 is parallel to the centerline 2. In this implementation, the device generates a beam converging point F2located on the longitudinal axis 2 symmetrical focal point F1hosting the source of divergent radiation. This device is provided by virtue of the principle of reversibility of the trajectories of the photons (see: Magomago. The radiation of channeled particles in crystals. M.: Energoatomizdat, 1986, p.35 [7]). This principle is that if the device from its output used as input to a beam, the shape of which corresponds to the initial output beam, but with the opposite direction of the rays, on the side of the former entrance,considered now as an output, can be obtained beam, the shape of which corresponds to the original input, but in the opposite direction of propagation of rays. Indeed, because the second reflecting surface 11 of the symmetric first surface 1, the output radiation of the right of Fig.4 half of the device containing the surface 1, getting into the identical left half, undergoing it the inverse transform, the resulting output beam is formed, the symmetric part of the radiation beam source located at the point F1that is captured by the device. This is displayed by the paths of the two rays in figure 4. The first one (X4), reflected at the point P4becomes a beam of X41that after reflection at point P6becomes a beam of X42and then, after reflection at point R7- beam X43that achieves an output focal point F2. Similarly, a beam of X5reaches the focal point F2after reflection at point P5where it becomes a reflected beam of X51and the reflection point R7where it becomes a reflected beam of X52who comes to the focal point F2.

Symmetric reflective surface 1 and 11 do not have to be connected to one another directly. They can be separated by a cylindrical insert 16 (f is g). Dashed lines 8, 7 figure 5 correspond to the borders surfaces 1 and 11. The insert 16 may be useful for whatever reasons, technological character, for example, to provide the desired overall length of the device.

Similarly, the device according to figure 3 may be provided with cylindrical inserts 26, 36, paired with nested surfaces 23 and 33 to make their lengths equal to the length of the outer reflecting surface 1 and the length of the device as a whole and the external surface 1 can also be paired with a cylindrical part 16 (see Fig.6). Dashed lines 8, 10, 12 figure 6 correspond to the borders surfaces 1, 21, 31. These cylindrical portions do not interfere with the device.

During fabrication of the proposed device can be used with the techniques described in the patent of the Russian Federation No. 2096353 (publ. 20.11.1997 [8]).

In particular, the device according to figure 4 can be manufactured in the form of a profiled tubular element (see Fig.7) with the wall 111, the inner side which plays the role of reflecting surfaces 1, 11, the respective surfaces 1, 11 figure 4. The reflective surface 1, 11 may belong directly to the wall 111. In this case, their identical material to the wall. But the reflective surface can be formed and a coating of another material, deposited on NR the inner side wall 111. Technology of application of reflective coatings are also described in the patent [8]. Similar to the above can be implemented in the device of figure 1, figure 5.

On Fig an embodiment of the device according to figure 4, in which the role of reflecting surfaces 1, 11 playing surface shaped channel 110 made in the monolithic body 112. In this case, the reflecting surface may be a surface channel 110 (i.e., the material of the reflective surface is identical to the material of the solid body 112), and deposited on the surface of the channel reflective coating. In this way can be implemented and the device of figure 1, figure 5.

Figure 9 presents an embodiment of the device according to figure 4 in the form of monolithic shaped radiolucent rod 113, covered with a layer 114 of reflective material. The boundary of the latter with the surface of the rod performs the role of reflective surfaces 1,11 corresponding to the surfaces 1, 11 figure 4. Can be similarly implemented in the device of figure 1, figure 5.

The technology of obtaining nested one inside the other surfaces are also described in the patent [8]. Using this technology can be implemented device 3 and 6.

The proposed device can find application in a variety of analytical x-ray devices: diffraction study the deposits and measurements, in particular, in stress analysis, x-ray fluorescence analysis to determine the elemental composition of substances and materials in medicine, including effects on malignant tumors, as well as devices for obtaining images of the internal structure of the object.

It is known [1]that the management principles of x-ray radiation applicable to gamma radiation and neutron radiation. Therefore, the proposed device can also be used to produce beams of particles with energy characteristic of such radiation.

1. Apparatus for forming a focused x-ray beam containing a reflecting surface in the form of surfaces of revolution and having a focal point located on the centerline of the specified surface of rotation, wherein forming the specified rotation surface has the shape of the curve, the tangent to which at any point of this curve forms with the direction specified on the focal point to the same angle not exceeding the critical angle of total external reflection of x-rays used range, while the reflective surface is on the inside or on the surface of the profiled tubular element made of reflective x-ray radiation material or have a coating of t is one material, any surface shaped channel in a monolithic body made of reflective x-ray radiation material or have a coating of such material on the surface of the specified channel, or the border between the profiled surface of the monolithic rod of radiolucent material and a layer deposited on the terminal cover from the reflected x-ray radiation material.

2. The device according to claim 1, characterized in that the angle between the axis of rotation and the direction of the focal point in the most remote from her point specified curve is less than the specified angle between the tangent to the curve at any point and direction to a focal point.

3. The device according to claim 1, characterized in that the tangent to this curve at its end point more remote from the focal point that is parallel to the centerline.

4. The device according to claim 3, characterized in that the reflecting surface is associated with a cylindrical reflecting surface part in which the end point of the generatrix is parallel to the centerline.

5. The device according to claim 3, characterized in that it additionally contains one or more reflective surfaces, coaxially nested in the specified reflecting surface, and for each of the specified condition related to the angle between the tangent to the curve, t is audace forming surface, and direction to a focal point.

6. The device according to claim 5, characterized in that each of these reflecting surfaces is associated with a cylindrical reflecting surface part in which the end point of the generatrix is parallel to the centerline.

7. The device according to claim 3, characterized in that it further comprises a reflecting surface, symmetric specified reflective surface relative to the plane perpendicular to the said axial line and passing through the specified end point at which the tangent to this curve is parallel to the centerline.

8. The device according to claim 7, characterized in that between two specified symmetric with respect to each other reflecting surfaces is associated with them cylindrical reflecting surface.



 

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30 cl, 10 dwg

FIELD: optics.

SUBSTANCE: in accordance to method, for manufacturing lens with required focal distance F, one or several lenses are made with focal distance, determined from formula , where N - number of lenses, and F0=Rc/2δ, where Rc - parabolic profile curvature radius, δ - decrement of refraction characteristic of lens material related to class of roentgen refracting materials, after that required amount of lens material is injected, where ρ - density of lens material, R - lens radius, in liquid state into cylindrically shaped carrier with same internal radius, material of which provides wetting angle to aforementioned liquid, determined by condition , carrier is moved to centrifuge, carrier with lens material are rotated until reach of homogeneity at angular rotation frequency , where η - viscosity of lens material in liquid state, Re - Reynolds number, then lens material is transferred to solid state during rotation, rotation is stopped and lens is assembled in holder.

EFFECT: production of lenses having aperture increased up to several millimeters, having perfect refracting profile in form of paraboloid of revolution with absent micro-irregularities (roughness) of surface.

11 cl

FIELD: medical engineering.

SUBSTANCE: method involves manufacturing lens from material capable of photopolymerization, forming one or several lenses with required focal distance by introducing required quantity of the lens material in liquid state into cylindrical holder which material possesses required wetting angle for given liquid. The holder is placed on centrifuge and rotated together with the lens material to achieve uniformity under preset rotation frequency condition. Then, when rotating, the lens material is transformed into solid state due to light source radiation flow being applied. Rotation is stopped and lens is assembled in the holder. Oligomer composition, capable of frontal free radical photopolymerization with monomer corresponding to it, and reaction photoinitiator, is taken as the lens material. Working temperature is to be not less than on 30-40°С higher than polymer glass-transition temperature during polymerization. The lens material transformation into solid state by applying rotation is carried out by means of frontal photopolymerization method with polymerization front moving along the lens axis from below upwards or along the lens radius.

EFFECT: enhanced effectiveness in producing x-ray lenses having paraboloid-of-revolution refraction structure and having aperture increased to several millimeters without microroughnesses available on the surface.

8 cl

FIELD: physics.

SUBSTANCE: invention concerns resorts for formation of a directed bundle of a X-rays from a divergent bundle created by the point or quasi-point source. The device for formation of a directed bundle of X-rays contains a catopter in the form of a surface of gyration and has a focal point. The focal point is located on an axial line of the specified surface of gyration. Forming surfaces has the curve shape. The tangent to the specified curve in any point of this curve forms with a direction on a focal point the same angle. This angle does not exceed a critical angle of the full exterior reflexion for X-rays of the used range. The catopter is or an interior surface of the shaped tubular device or a surface of the shaped channel in a monolithic body, or boundary between the surface of the shaped monolithic core and a stratum of the coat superimposed on this core. The specified tubular device or the channel is executed from a material reflecting X-rays or has a coat from such material. The specified core is executed from a radiotransparent material. The specified coat of the core is executed from a material reflecting X-rays.

EFFECT: increase of radiation source angle capture.

8 cl, 9 dwg

FIELD: technological processes.

SUBSTANCE: application: for manufacturing of X-ray refractory lenses. Substance: consists in the fact that lens matrix is manufactured from material capable of photopolymerisation, formation of one or several lenses with required focus distance, talking into account number and geometric characteristics of these lenses, characteristics of these lenses material and holder material, and also dynamic mode, in which lens matrix is generated, besides, produced matrix is used to form one or several bases for lenses, for this purpose material is introduced, which has no adhesion to matrix material, in matrix base material is transferred into solid phase, produced base is separated from matrix, is placed in bath with liquid photopolymer on piston with precision travel of linear displacement, then photopolymerisation is carried out through set of masks with annular clearances and radial slots, where internal radius of annular clearance is identified as , and external radius - as , where m is even number, base is shifted by value equal to even number of phase shift lengths L=mλ/δ, operations of exposure through the subsequent masks and shift are repeated until specified number of segments is obtained, lens is separated from base, and lens is installed in holder.

EFFECT: improved focusing properties of lenses with rotation profiles.

7 cl, 4 dwg

FIELD: physics.

SUBSTANCE: invention relates to generation of radiation in a given direction and required wavelength range. The method of generating radiation in a given direction in the required wavelength range involves generation of initial radiation using a radiation source and filtration of the initial radiation through controlled distribution of refraction index of beams in the control region. Filtration provides for selective deviation of beams of initial radiation depending on their wavelength and selection of beams with given wavelength. Control of distribution of refraction index of beams is achieved through controlling distribution of electron density in the control region. The device for generating radiation has a source of initial radiation and filtering apparatus. The filtering apparatus have apparatus for providing for controlled distribution of refraction index of beams. The latter, in their turn, have apparatus for controlling distribution of electron density in the control region. The lithography device contains the said device for generating radiation.

EFFECT: invention reduces probability of damage to filtration apparatus, while retaining the stream of radiation incident on them, and provides for generation of radiation at required wavelength.

28 cl, 4 dwg

FIELD: power engineering.

SUBSTANCE: device has a stationary vacuumised neutron guide made in the form of a stainless steep pipe, nickel or copper. The device is additionally equipped with a section of a neutron guide made as a flexible polyvinyl chloride tube, the inner wall of which has mirror surface. Values of average roughness of the inner wall of the flexible polyvinyl chloride tube do not exceed the length of the ultracold neutron wave length.

EFFECT: reduced losses of low energy neutrons during transportation, capability of delivering them into hard-to-access areas.

8 cl, 5 dwg, 1 tbl

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