DE102005039642B3 - Collimator system for x-ray diffractometery, e.g. for luggage inspection, has primary collimator with ring-shaped opening, and secondary collimator with cylindrical- and conical-surface apertures - Google Patents

Abstract

The collimator system includes a primary collimator (1) and a secondary collimator (2). The primary collimator has a central aperture (3) through which the z-axis passes, and a concentrically arranged ring-shaped opening. The secondary collimator has a cylindrical-surface-shaped aperture (5) which extends concentrically to the z-axis, and a conical-surface-shaped aperture (6) which extends to a point on the z-axis between the primary collimator and the secondary collimator. Independent claims are included for an x-ray diffraction scanner, and f a method of carrying out x-ray diffraction analysis.

Description

The The invention relates to a collimator system for X-ray diffractometry with a primary collimator and a secondary collimator. About that In addition, the invention also deals with an X-ray diffraction scanner with an x-ray tube, a Collimator system, an investigation area between primary collimator and secondary collimator and a detector. After all The invention also relates to a method for carrying out a X-ray diffraction analysis, wherein a first diffraction ring of a ring of a volume element in a plane parallel to the xy plane, and the ring through a primary Cone sheath jet is hit with a fixed opening angle, whereby only the part of the cone-sheath jet diffracted at the ring is detected which is bent parallel to the z-axis.

at a baggage check will often a computed tomography system used to X-ray dangerous or to detect prohibited substances within a piece of luggage. Is to it is known that by means of X-ray computer tomography in the luggage only single critical regions are detected. These must then be specified in a further step in order to to determine with certainty whether it is dangerous or prohibited substances is. This is achieved, for example, by X-ray diffractometry. X-ray diffractometry However, it is only partially suitable for inspecting entire check-in of baggage. because this takes too long time and thus the incurred Luggage - for example at an airport - not be checked in an acceptable time can. In contrast, the X-ray diffractometry be used very well if only a few regions in one Baggage for examination in the second step. Small areas can be deployed using a strong X-ray tube scanned flat become. These facilities have mostly over high frame sizes and are relatively expensive. Pure punctual and cost-effective investigations will be so far made that a Festanodenröhre with 1 to 2 KW achievement is used, which generates a needle beam. The needle beam will only over the regions rasterized in the first step using the computed tomography method were recognized as critical. By means of a suitable secondary collimator are at a certain angle (ie on a cone coat lying) diffracted X-rays recorded by means of a single-channel Ge detector. About the recorded diffraction profiles may affect the material within the closed back critical region become. This makes a safe decision possible, whether in the critical Region a dangerous or inadmissible Fabric is included.

From the US 5,008,911 a device is known for measuring the momentum transfer of X-ray quanta which are elastically scattered in an examination area. The device has a collimator system with a primary collimator between the X-ray source and the examination area and a secondary collimator between the examination area and the detector. The primary collimator allows for a point-shaped central jet and on the other hand a cone sheath beam. The secondary collimator passes the central jet and a tapered cone sheath jet. As an alternative to the passage of a cone-shaped jet, in another embodiment, a cylinder jacket-shaped passage of the diffracted beam is disclosed.

From the EP 0 924 967 A2 An apparatus for measuring the X-ray diffraction on a test object is also known, which has a primary and a secondary collimator. The primary collimator produces three spot beams, one of which is the central beam and the other two are at an opening angle to each other. Before the three beams strike a test object, the two beams extending at an opening angle are aligned by diffraction or reflection and a subsequent diaphragm in each case via a crystal monochromator in such a way that they run parallel to one another. The secondary collimator has three holes in the area of the three beam paths of the spot beams, through which the beams fall into one detector each.

From the US Pat. No. 6,442,233 B1 For example, an X-ray device is known that generates a fan-shaped X-ray beam. This is shot at a test object. The X-ray quanta diffracted and scattered in the object are directed by means of two secondary collimators to an associated detector. In the forward direction of the incident X-ray beam, a secondary collimator having parallel plates inclined toward the central beam in the direction of the object is formed. The additional secondary collimator is at 90 ° to the plane of incidence of the X-ray quanta. He has at 90 ° to the plane of incidence aligned, parallel to each other metal plates.

The object of the invention is to provide a collimator system and an X-ray diffraction scanner with collimator system with which an existing beam intensity can be optimally utilized. For this purpose, a method for carrying out an X-ray diffraction analysis should also be found. A further object, in particular for advantageous developments of the invention, is to provide a small-scale X-ray diffraction scanner available.

The Task is by a collimator system for an X-ray diffractometry with a primary collimator and a secondary collimator solved with the features of claim 1. Because of the primary collimator a central aperture through which the z-axis passes and one concentric to it arranged annular opening, not just the intensity the X-ray source of a needle beam transmitted to an object, but beyond also further X-radiation, which, as a cone-sheath jet, hits the object concentrically around the needle beam. Characterized in that the secondary collimator a cylinder jacket-shaped opening which runs concentric with the z-axis ver, and at the same time a cone-shaped Has aperture, which points to an origin on the z-axis between the primary collimator and the secondary collimator it is possible the X-ray diffraction analysis of a Volume element of a tunnel of an X-ray device (hereinafter short volume element called), which in a plane parallel to xy plane is arranged and there from an origin point as well a concentric circular ring and its diffraction angle for all Scatter radiation - it does not matter whether it originates from the central point of origin or from the concentric circular ring - under one and the same angle is recorded. This will for the entire detected scattered radiation for a reliable implementation of the X-ray diffraction mandatory condition fulfilled. The intensity is significantly higher, as if only the radiation diffracted at the given angle taken from the central point and analyzed or only the diffracted radiation from a cone-sheath jet.

A advantageous development of the invention provides that the secondary collimator two spaced apart in the z direction plate-shaped aperture having, wherein the cylinder jacket-shaped opening through each an existing in each aperture, aligned in the z-direction annular aperture is formed, and the cone-shaped opening through each one disposed in each aperture concentrically arranged about the z-axis annular Aperture is formed. This makes it possible that the secondary collimator is not must be formed of a solid in the z-direction body. Across from Such training is saved in the present case mass and above In addition, the "dirt effect" as small as possible held by a scatter along the openings in z direction would come.

A Further advantageous development of the invention provides that the distance between the first diaphragm and the second diaphragm in the z-direction is constant. This makes it possible that for the transmitted cone sheath beam always the same opening angle given is. this leads to to that too the condition for the distance of an x-ray tube from the primary collimator is fixed, since this is the opening angle of the cone-sheath jet forming an annular region of the object illuminates, defines.

A Further advantageous development of the invention provides that the secondary collimator at least has two systems of openings, with each system a cylinder jacket Opening and a cone-shaped opening belong and between the secondary collimator and the primary collimator a sliding Blockerblende with at least one annular opening is present, which covers one of the two systems of openings. Thereby Is it possible, that the examination area in which an object is arranged divided into two layers with respect to the z-axis. This that means whichever system of breakthrough right now is not blocked, the volume element from which the diffracted radiation is absorbed is, further or less far away from the x-ray tube. This can the entire collimator system, thus also an x-ray diffraction scanner, in which Such a collimator system is used to be flatter.

A Further advantageous development of the invention provides that the primary collimator and the secondary collimator via connecting means are so interconnected that their distance in z-direction constant is. This makes it possible that in a very simple way the z-component of the examined Volume element can be varied without having a new one each Adjustment of the diffraction angle must be made. This applies if also the x-ray tube one fixed distance to the primary collimator and thus a fixed predetermined opening angle of the generated Cone-shaped jet has.

In addition, will the task by an x-ray diffraction scanner solved with the features of claim 6. Such an inventive X-ray diffraction scanner shows next to an x-ray tube, the X-rays emitted in the z-direction, an examination area between a primary collimator and a secondary collimator, these two collimators become a prescribed collimator system according to the invention belong. About that In addition, the X-ray diffraction scanner according to the invention has a detector located in the z direction behind the secondary collimator is arranged. By using the collimator system according to the invention arise the above Advantages.

A advantageous development of the invention provides that the x-ray tube and the collimator system over Connecting means are interconnected so that their respective Distance between each other in the z-direction is constant. This makes it possible - as above already running - that the x-ray tube always make a cone-sheath jet strike the object with a fixed opening angle having. In conjunction with a fixed distance between primary collimator and secondary collimator is thus always guaranteed that without a readjustment - even moving the entire system of x-ray tube and collimator system - always the diffraction analysis is done from one and the same volume element, no matter in which z-distance this is within the examination area.

A Further advantageous development of the invention provides that the distance of the detector to the secondary collimator in the z-direction is constant is. This will ensure that the size of the detector is always sufficient to all to detect diffracted radiation and no diffraction radiation this, which would lead to a reduction in intensity.

Of Furthermore, the object is achieved by a method according to the patent claim 9 solved. in this connection becomes the central needle beam at a fixed diffraction angle bent, the half the opening angle the cone-sheath jet transmitted by the primary collimator, equivalent. At the same time the illuminated by the cone sheath beam Ring diffracted in the volume element and only let the radiation through, those at the same diffraction angle as that of the needle beam is produced. This is then a cylindrical jacket-shaped diffraction beam. Thus, optimal utilization of the total available intensity Guaranteed at diffraction radiation at a predetermined diffraction angle.

Especially Advantageously, such an optimum yield can be achieved by that an inventive - above already described - X-ray diffraction scanner is used.

A Further advantageous development of the invention provides that the x-ray diffraction scanner dependent on shifted from the z-component of the volume element to be examined in the z-direction becomes. This makes it possible that the volume element to be examined in z-direction on the pre in a tomographic or other suitable method determined area and only this specific can be examined. Thus, it is not necessary, the object to be examined in its height to change, but the x-ray diffraction scanner will be at the respective height set.

A Further advantageous development of the invention provides that a suitable blocking aperture is introduced into the X-ray diffraction scanner, to release only one system of breakthroughs and thus one Layer in z-direction to select the examination area, in which the volume element to be examined is located. In order to Is it possible, the maximum examination area in z-direction in two layers divide. It is therefore not necessary, possibly the X-ray diffraction scanner in its height in terms of to move the z component when a volume element in the upper layer and one in the lower layer are checked sequentially have to. Furthermore This will increase the overall height of the X-ray diffraction scanner diminished, as this along the z axis is no longer on the full height of the examination area in order to fully cover it, but only about half the height. It goes without saying that more systems of breakthroughs are possible with other Blockerblendenausgestaltungen. The more systems of breakthrough are present, the smaller the height of each single layer and thus also the travel length of the X-ray diffraction scanner in the z direction. this leads to to that with increasing number of systems of breakthroughs the height becomes smaller.

Further Advantages and details of the invention will be apparent from the in the Figures illustrated and described below embodiments explained. Showing:

1 3 shows a schematic cross section through a first exemplary embodiment of an X-ray diffraction scanner according to the invention in a first position,

2 the x-ray diffraction scanner of 1 in a second position,

3 a schematic cross section through a second embodiment of an inventive X-ray diffraction scanner with blocker aperture in a first position, and

4 the x-ray diffraction scanner the 3 with the blocker shutter in a second position.

In 1 schematically a first embodiment of an X-ray diffraction scanner according to the invention is shown in cross section. An x-ray tube 15 emitted from their focus 16 from X-rays 17 , It is believed that in focus 16 the origin of a Cartesian coordinate system is located. The x-axis is horizontal in the leaf plane, the y-axis is perpendicular to the leaf plane, and the z-axis is vertical in the leaf plane.

From the X-ray emitted in the z-direction 17 is by means of a primary collimator 1 only a part passed. The primary collimator 1 has a central aperture 3 on the z-axis and a concentric around it arranged first annular opening 4 which is aligned in a plane parallel to the xy plane. This gives you behind the primary collimator 1 a central needle jet propagating along the z-axis and a cone-coat jet concentrically disposed therearound. The conical jacket jet has an opening angle α which lies in the range of 1 ° to 5 ° and is for example 4 °. The diameter of the needle jet is about 1-2 mm. For reasons of clarity, the opening angle α is shown greatly enlarged.

These two beam geometries enter an investigation area 18 , For example, a tunnel, a. Within the tunnel is an object to be examined, whose partial volume 20 to be subjected to X-ray diffractometry. The needle jet hits this volume element 20 centrally at an origin point 24 , In contrast, the cone sheath jet hits this volume element 20 in a circular ring 21 , concentric around the point of origin 24 runs. Both at the origin point 24 as well as in the ring 21 the primary X-ray radiation is scattered. To carry out the energy-dispersive X-ray diffraction, it is necessary that all detected beams are registered at the same diffraction angle β = α / 2.

To ensure this is outside the scope 18 a secondary collimator 2 arranged. In the case shown, this is a first plate-shaped aperture 7 at a fixed distance to a second parallel plate-shaped aperture 8th is arranged. The first aperture 7 has a second annular opening 9 which are aligned with respect to the x-direction with a third annular aperture 10 in the second aperture 8th is arranged. This will remove from the volume element 20 from the circular ring 21 originating only a cylinder jacket jet 26 let pass, the first diffraction ring 22 at the detector 19 generated. The diffraction angle β of this cylinder jacket jet 26 is just half the size of the opening angle α of the primary collimator 1 generated cone coat jet. The height, ie the z-component, of the volume element 20 depends on the diameter of the second and third annular openings 9 . 10 and the primary opening angle α.

To the intensity of the recorded X-rays in the detector 19 for X-ray diffractometry, strikes β at the same diffraction angle, below which also the cylinder jacket jet 26 is diffracted, another diffracted X-ray into the detector 19 , This is in the secondary collimator 2 a cone-shaped opening 6 formed, whose opening angle α corresponds to the double diffraction angle β. The cone-shaped opening 6 is through a fourth annular opening 11 in the first aperture 7 and a fifth annular aperture 12 in the second aperture 8th generated. These are formed concentrically with each other about the z-axis, so that they form a conical surface, the tip of which within the volume element 20 at the point of origin 24 lies.

The detector 19 is just so far from the secondary collimator 2 removed that both from the cylinder jacket jet 26 generated first diffraction ring 22 as well as one from the cone-sheath jet 23 generated second diffraction ring 25 congruent in the detector 19 arise. The detector 19 has in the example shown a diameter of about 8 cm. The volume element has a diameter of about 5 cm parallel to the xy plane and a height of about 5 cm in the z direction. At a normal tunnel height of 600 mm with the above-mentioned values for the opening angle α, the aforementioned diameter of 8 cm of the detector is sufficient 19 out to the entire at the diffraction angle β from the volume element 20 to detect scattered radiation.

By means of this X-ray diffraction scanner according to the invention, it is thus possible to determine the intensity of the X-ray radiation emanating from a volume element at a specific diffraction angle β 20 greatly increase. This helps immensely to optimize the result of X-ray diffractometry and shorten measuring times.

Instead of using a secondary collimator 2 from two panels 7 . 8th , it is also possible to design the secondary collimator in the z-direction throughout as a single diaphragm. Instead of a single detector 19 it is also possible to segment this, for example, to provide a detector for one half-side and a detector for the other half-side or a total of four segments, etc. It is also possible by changing the distance between the focus 16 the X-ray tube 15 and the primary collimator 1 to change the opening angle α of the generated cone sheath jet to α '. This results for the cylinder jacket jet 26 that is in the volume element 20 through the circular ring 21 is generated that the diffraction angle β 'changes. As mentioned above, the relationship β '= α' / 2 must be maintained. However, this means that for a useful exhaustion of the intensity - as described above - the angle of the cone-shaped opening 6 in the secondary collimator 2 must be adjusted. This is possible because the distance between the two panels 7 . 8th is changed in z-direction.

If this is set so that it corresponds to the new diffraction angle β ', the desired diffracted intensity - as described above - passes through the secondary collimator 2 and enters the detector 19 when the detector 19 with the newly set Skundärkollimator 2 also adjusted in z-direction accordingly.

In 2 is the x-ray diffraction scanner of 1 shown, wherein the volume element 20 at a lower point to a displacement 27 opposite to that of 1 located. Since the x-ray diffraction scanner of the 2 around the same as in 1 is only concerned with the relevant changes 1 indicated, wherein the reference numerals have been retained. The X-ray diffraction scanner was moved so that the distance between focus 16 and primary collimator 1 remains constant. As a result, the opening angle α has remained the same. In addition, the distance between the secondary collimator 2 and the primary collimator 1 also kept constant in the z direction and at the same time the distance between the first diaphragm 7 and second aperture 8th of the secondary collimator 2 stayed the same in the z-direction. As a result, the diffraction angle β has not changed. This means that the only difference to 1 the one is that now X-ray radiation is detected, which consists of a volume element 20 comes, which is about the displacement 27 is lower, that is shifted in the z-direction down.

In the illustrated embodiment, the distance between the detector is further 19 and secondary collimator 2 also kept constant. This causes the first diffraction ring 22 and the second diffraction ring 25 in the detector 19 together again. The entire geometry was changed only in relation to the tunnel.

However, it is also possible to use the detector 19 to leave at a fixed location and thus its distance in the z-direction from the secondary collimator 2 to change if the height adjustment of the volume element 20 is made. This only has the effect that the first diffraction ring 22 no longer with the second diffraction ring 25 coincides. It is then necessary to ensure that the through the cone sheath beam 23 originating diffraction radiation completely in the detector 19 is recorded so that no loss of intensity occurs.

With a common X-ray diffraction scanner with a tunnel height of 600 mm, if this entire height of the tunnel is to be investigated, there is an additional 600 mm above the tunnel and an additional 600 mm below the tunnel to complete the X-ray diffraction scanner to move over the entire height in z-direction. This results in a total height of at least 1,800 mm plus the dimensions of the arrangement tube 15 and primary collimator 1 as well as secondary collimators 2 and detector 19 ,

By means of the second embodiment of an X-ray diffraction scanner is based on the 3 and 4 explains how the height can be reduced.

The structure of the X-ray diffraction scanner in 3 corresponds substantially to that of the first embodiment of the 1 and 2 , In the following, therefore, only the differences will be discussed; the same or equivalent parts are provided with the same reference numerals.

The main difference lies in the secondary collimator 2 founded. This is again from two panels 7 . 8th built up. Both the first aperture 7 as well as the second aperture 8th However, not only each have two concentric openings, but in each case a total of four concentric openings. Here are two of the openings of the first panel 7 aligned in z-direction over two of the breaks in the second aperture 8th , These thus each form two cylinder jacket-shaped openings 5 , This means that, under the still unchanged diffraction angle β, X-ray radiation from two different volume elements at different heights would enter the detector (not shown). However, this is prevented by having a blocker aperture 13 above the first aperture 7 is arranged and one of the two cylinder jacket-shaped openings 5 (here closer to the z-axis) covers. This allows only diffracted radiation from the deeper ring 21 fall into the detector at the diffraction angle β. Also below the diffraction angle β from the upper ring 21 ' originating X-radiation, on the other hand, is blocked.

In the origin point 24 on the z-axis in the same volume element 20 passes under the diffraction angle β through the concentric annular openings 11 and 12 another cone-sheath jet 6 into the detector 19 , In the secondary collimator 2 However, it is still a second cone-shaped opening 6 formed, the X-ray radiation would pass at the diffraction angle β from another volume element. However, this is also done by the blocker aperture 13 prevented. It is thus such that the blocker aperture 13 two annular openings 14 through which only the β under the diffraction angle of the volume element 20 to get through in the lower area, but the x-radiation also originating from the diffraction angle β in the upper volume element through the blocker stop 13 be held.

In 4 is shown as the blocker aperture 13 with a modified annular opening 14 now transmits X-rays, which are below the diffraction angle β from the upper volume element 20 come. On the other hand, any X-ray radiation at the diffraction angle β from the lower volume element (like this one in FIG 3 still through the secondary collimator 2 did not pass through).

The result is that just by changing the position of the blocker aperture 13 A decision can be made as to whether X-rays are at the diffraction angle β from the upper volume element 20 or the lower volume element 20 into the detector 19 should arrive. As a result, it means that there are two layers 28 . 29 which are completely separate from each other in terms of analysis by X-ray diffractometry. This makes it very easy to switch between the first layer 28 in the lower half of the examination area 18 and the second layer 29 in the upper area. This means in the end that in the 1 and 2 shown displacement of the X-ray diffraction scanner must be made only over half of the distance in the z-direction to descend the entire height and every possible volume element 20 cover. This makes it possible that height is saved. The tunnel height remains at 600 mm, but it is only necessary to provide above and below each 300 mm displacement path. Thus, the height is reduced by 600 mm to 1,200 mm plus the above dimensions.

the It is clear to a person skilled in the art that the invention also applies to tunnels with others Heights applicable is. For example, with a tunnel height of 400 mm, it is two Times half the displacement path (up and down) from 200 mm is saved. Thus results instead of a height of 1,200 mm in conventional design here a height of only 1,000 mm. The same applies to other tunnel heights.

The blocker aperture 13 is designed so that the two concentric openings 14 of the 3 and the annular opening 14 ' of the 4 are arranged side by side. A transition from the in 3 mode shown in the 4 mode shown by a shift of the blocker aperture 13 parallel to the xy plane.

It is clear to the person skilled in the art that, through further systems of apertures (in addition to those disclosed in US Pat 3 and 4 shown two systems of perforations) can be made a further reduction in height. It is then necessary that the blocker aperture 13 even more positions, where they always releases only one system of openings.

The blocker aperture 13 does not have to be as accurate in terms of geometric design as the first aperture 7 and the second aperture 8th , It is only necessary that the unneeded openings of the secondary collimator 2 be covered. A blocker screen 13 may therefore consist of concentric circles and rings of X-ray absorbing material, which is glued to a thin film, such as Plexiglas. In contrast, the two apertures 7 . 8th not be executed, since they must define the diffraction angle β very exactly. The irises 7 . 8th are therefore usually made of a radiopaque material, the annular openings 9 to 12 each have thin webs or similar brackets that connect the concentric rings with each other. Although this gives a small loss of intensity, this is not as significant as if a change in the diffraction angle β would be given due to lack of accuracy.

1

primary collimator

2

secondary collimator

3

central aperture

4

first annular perforation

5

cylinder jacket-shaped opening

6

cone-shaped opening

7

first cover

8th

second cover

9

second annular perforation

10

third annular perforation

11

fourth annular perforation

12

fifth annular opening

13

blocker panel

14

concentric perforations

14 '

annular opening

15

X-ray tube

16

focus

17

X-rays

18

study area

19

detector

20

voxel

21 21 '

annulus

22

first diffraction ring

23 23 '

Conical surface beam

24 24 '

point of origin

25

second diffraction ring

26 26 '

Cylinder jacket jet

27

displacement

28

first layer

29

second layer

α, α '

opening angle

β, β '

diffraction angle

Claims (12)

Collimator system for X-ray diffractometry with a primary collimator ( 1 ) and a secondary collimator ( 2 ), characterized in that the primary collimator ( 1 ) a central aperture ( 3 ), through which passes the z-axis, and a concentrically arranged annular aperture ( 4 ), the secondary collimator ( 2 ) a cylinder jacket-shaped opening ( 5 ), which runs concentrically to the z-axis, and a cone-shaped opening ( 6 ), which is at a point on the z-axis between the primary collimator ( 1 ) and the secondary collimator ( 2 ). Collimator system according to claim 1, characterized in that the secondary collimator ( 2 ) two spaced apart in the z-direction plate-shaped aperture ( 7 ; 8th ), wherein the cylinder jacket-shaped opening ( 5 ) by one in each aperture ( 7 ; 8th ), in the z-direction aligned annular aperture ( 9 ; 10 ) is formed, and the cone-shaped opening ( 6 ) by one in each aperture ( 7 ; 8th ) existing concentric about the z-axis annular aperture ( 11 ; 12 ) is formed. Collimator system according to claim 2, characterized in that the distance between the first diaphragm ( 7 ) and second aperture ( 8th ) is constant in the z-direction. Collimator system according to one of the preceding claims, characterized in that the secondary collimator ( 2 ) has at least two systems of openings, wherein for each system a cylinder jacket-shaped opening ( 5 ) and a cone-shaped opening ( 6 ) and between the secondary collimator ( 2 ) and the primary collimator ( 1 ) a sliding blocker aperture ( 13 ) with at least one annular opening around the z-axis ( 14 . 14 ' ) is present, which covers one of the two systems of openings. Collimator system according to one of the preceding claims, characterized in that the primary collimator ( 1 ) and the secondary collimator ( 2 ) are connected to each other via connecting means so that their distance in the z-direction is constant. X-ray diffraction scanner with an X-ray tube ( 15 ), whose focus ( 16 ) is arranged in the coordinate origin and the X-radiation ( 17 ) in the z-direction, with a collimator system of a primary collimator ( 1 ) and a secondary collimator ( 2 ) according to one of the preceding claims, with an examination area ( 18 ) between the primary collimator ( 1 ) and the secondary collimator ( 2 ) and a detector located in the z-direction behind the secondary collimator. X-ray diffraction scanner according to claim 6, characterized in that the X-ray tube ( 15 ) and the collimator system are connected to each other via connecting means so that their respective distance from one another in the z-direction is constant. X-ray diffraction scanner according to claim 7, characterized in that the distance of the detector ( 19 ) to the secondary collimator ( 2 ) is constant in the z-direction. Method for carrying out an X-ray diffraction analysis, wherein a first diffraction ring ( 22 ) of a ring ( 21 ) of a volume element ( 20 ) is received in a plane parallel to the xy plane, and the ring ( 21 ) is hit by a primary cone-sheath jet with a fixed angle of aperture (α) and diffracted thereon, whereby only the part of the ring ( 21 ) bent cone sheath jet ( 23 ) as a first diffraction ring ( 22 ), which is parallel to the z-axis to a cylinder jacket jet ( 26 ) is bent, characterized in that at the same time a second diffraction ring ( 25 ) of an origin point ( 24 ) of the volume element ( 20 ) which is located on the z-axis and whose diffraction angle (β) is equal to half the opening angle (α) of the primary cone sheath jet. Method according to claim 9, characterized that it is using an x-ray diffraction scanner with the features of one of the claims 6-8 is performed. A method according to claim 10, characterized in that the X-ray diffraction scanner in dependence on the z-component of the volume element to be examined ( 20 ) is shifted in the z-direction. Method according to claim 10 or 11, characterized in that a suitable blocking aperture ( 13 ) is introduced into the X-ray diffraction scanner to provide only one system of Durchbre leave a record free and therefore one shift ( 28 ; 29 ) in the z-direction of the examination area ( 18 ), in which the volume element to be examined ( 20 ) is located.