X-ray parallel beam light source system and X-ray collimator

Abstract

The present disclosure discloses an X-ray parallel beam light source system and an X-ray collimator, wherein the X-ray parallel beam light source system includes an X-ray light source, an X-ray collimator, a ray shielding sleeve, a beam blocker and a detector, the X-ray collimator is parabolic, the X-ray light source is arranged at the focus of the parabolic X-ray collimator, so that the X-rays emitted by it can complete a single total reflection in the X-ray collimator; a ray receiving chamber is provided inside the ray shielding sleeve; the beam blocker is used to block the direct light passing through the X-ray collimator and to block part of the divergent light beam to reduce the divergence, thereby constraining a circular parallel X-ray beam; the detector is arranged at the rear end of the ray receiving chamber, and is used to detect the intensity of the exit beam of the X-ray collimator. The X-ray parallel beam light source system can constrain X-rays with a wider energy range and form a parallel X-ray beam with a smaller divergence.

Description

Technical Field

[0001] The present disclosure relates to the field of X-ray technology, and in particular to an X-ray parallel beam light source system and an X-ray collimator. Background Art

[0002] In the application fields related to X-ray technology, the application of X-ray parallel beams is extremely extensive, for example: X-ray powder diffraction, biological macromolecular crystal diffraction, medical diagnostic imaging, projection slice imaging technology, etc. all require the use of X-ray parallel beams. However, the divergence of X-ray parallel beams has a great influence on the accuracy and resolution of the above applications. Therefore, how to effectively control and obtain a smaller divergence is currently an important research direction in the industry.

[0003] The inventor of the present application has studied and found that the commonly used parallel X-ray confinement methods in the prior art are mainly the following:

[0004] Method 1: Divergent slit or collimated aperture

[0005] This device requires a smaller slit or aperture to be made, and can only utilize about 1% of the intensity of the X-ray source. The divergence of the resulting X-ray parallel beam is also relatively large, and the divergence angle cannot be controlled to be reduced.

[0006] Method 2: Multilayer film

[0007] This device is relatively complex to manufacture and has a high cost. Although the utilization rate of the light source has been improved, the device can only obtain a one-dimensional linear quasi-parallel beam with a divergence of micro-radians. In addition, due to the working principle, there are certain restrictions on the energy that can be constrained.

[0008] Method 3: Polycapillary parallel beam lens

[0009] This device has a significant improvement in light intensity utilization, about 20%-30%, and a divergence of milliradian level. However, this device also has certain limitations on the energy range, generally only able to constrain rays below 35keV.

[0010] Method 4: Synchrotron radiation light source combined parallel constraint system

[0011] Since synchrotron radiation sources can produce beams of higher intensity, they can be used in combination with the various devices mentioned above, and can achieve very high parallelism requirements by sacrificing a large amount of radiation intensity. However, this combination system is not suitable for laboratory light sources and is limited by the synchrotron radiation source's own factors.

[0012] Based on the above survey, in order to solve the above problems, the inventors of the present disclosure have invested a lot of time and energy to research and develop a simple and efficient X-ray collimator, which is further disclosed as described below. Summary of the invention

[0013] In view of this, the embodiments of the present disclosure provide an X-ray parallel beam light source system and an X-ray collimator, which can constrain X-rays in a wider energy range and form a parallel X-ray beam with a smaller divergence.

[0014] To this end, the present disclosure discloses an X-ray parallel beam light source system, the system comprising:

[0015] X-ray source;

[0016] An X-ray collimator, which is parabolic, and the X-ray light source is arranged at the focus of the parabolic X-ray collimator so that the X-rays emitted by it can complete a single total reflection in the X-ray collimator;

[0017] The ray shielding sleeve has a ray receiving chamber in its interior; a collimator embedding interface is correspondingly provided in the ray receiving chamber on a side close to the light source for setting the X-ray collimator;

[0018] A beam blocker is arranged in the positioning slot inside the radiation shielding sleeve and is located behind the outlet of the X-ray collimator, and is used to block the direct light passing through the X-ray collimator and to block part of the divergent beam to reduce the divergence, thereby constraining a circular parallel X-ray beam;

[0019] A detector, arranged at the rear end of the ray receiving chamber, for detecting the intensity of the exit light beam of the X-ray collimator;

[0020] The relative position of the X-ray collimator and the X-ray light source is adjustable, and is adjusted based on the intensity of the exit light beam received by the detector. When the intensity of the exit light beam reaches the maximum, the light source system is collimated.

[0021] In an optional embodiment, the X-ray collimator is a single capillary glass tube X-ray reflector, which is parabolic in shape and is a collimator that can form a circular parallel X-ray beam with ultra-small divergence and a wide energy range.

[0022] In an optional embodiment, the inlet of the X-ray reflector is in close contact with the front end outer wall of the radiation shielding sleeve, and the outlet is in close contact with the front end of the radiation receiving chamber.

[0023] In an optional embodiment, the inner surface of the X-ray reflector is coated with a heavy metal oxide film layer for confining X-rays in the energy range of 0 to 130 keV to obtain a sub-milliradian divergence of the annular parallel X-ray beam.

[0024] In an optional embodiment, the radiation shielding sleeve is a cylindrical heavy metal shielding sleeve, and the inner diameter of the radiation shielding sleeve is equal to or slightly larger than the outlet diameter of the X-ray reflector.

[0025] In an optional embodiment, the beam blocker is a heavy metal circular slice with a thickness T of 0.2 mm to 0.5 mm; the diameter of the beam blocker is equal to or slightly smaller than the entrance diameter of the X-ray reflector; wherein the beam blocker is fixed in the ray shielding sleeve by a material transparent to X-rays, wherein the center of the beam blocker is located on the center line of the ray shielding.

[0026] In an optional embodiment, the radiation shielding sleeve is a lead shell.

[0027] In an optional embodiment, the beam blocker is a lead X-ray beam blocker, which is composed of an annular polymer compound and the positioning groove, and is fixedly arranged behind the exit of the X-ray reflector.

[0028] In an optional embodiment, the distance between the beam blocker and the exit of the X-ray reflector is S, S ≥ 2 (OD-ID) (F + L) / D; the length of the radiation shielding sleeve is Pl, and Pl ≥

[0029]

[0030] Wherein, D is the size of the focal spot of the X-ray light source, ID is the entrance diameter of the X-ray reflector, OD is the exit diameter of the X-ray reflector, L is the length of the X-ray reflector, and F is the focal length of the X-ray reflector.

[0031] In an optional embodiment, the width of the annular parallel X-ray beam is d, and The divergence constraint of the annular parallel X-ray beam is:

[0032] In an optional embodiment, the X-ray light source is a tungsten target micro-focus light source with a focal depth of 16.5mm and a focal spot size of 20μm; the inner wall of the X-ray reflector is coated with a hafnium oxide film of about 50nm; the focal length of the X-ray reflector is 0.5, the entrance diameter and the exit diameter are 800μm and 1020μm respectively, the length L is 10cm, and the focal length F is 16cm. The diameter of the beam blocker is 800μm, the thickness is 200μm, and the distance S between the beam blocker and the exit of the X-ray reflector is 0.5cm; the inner diameter of the ray shielding sleeve is 1020μm, and the length Pl is 8cm; the energy range of the annular parallel beam that can be constrained is about 5keV to 60keV, and the divergence of the annular parallel beam is about 40μrad.

[0033] In addition, in order to effectively collimate the light source system, the present disclosure also discloses an X-ray collimator, which is a single capillary glass tube X-ray reflector with a parabolic shape; wherein the inner surface of the single capillary glass tube X-ray reflector is coated with a layer of heavy metal oxide by atomic deposition, which is used to broaden the energy range of the X-rays reflected by the reflector, and the energy range of the X-rays that can be constrained is 0 to 130 keV.

[0034] In an optional embodiment, the focal length of the X-ray reflector is P, and 0.5≤P≤1, the length of the X-ray reflector is in the range of 5 cm to 10 cm, and the diameters of the inlet and outlet are in the range of 400 μm to 1100 μm.

[0035] In an optional embodiment, the inner wall of the X-ray reflector is coated with a hafnium oxide film with a thickness not exceeding 50 nm.

[0036] By implementing the technical solution of the present disclosure, the technical solution disclosed in the present disclosure has the following technical effects compared with the prior art:

[0037] The present invention discloses an ultra-small divergence wide energy range annular X-ray collimator based on a parabolic single capillary glass X-ray reflector, which can greatly improve the utilization efficiency of the light source beam, and at the same time can constrain X-rays in a wide energy range, and can obtain annular parallel beam X-rays with a divergence at the sub-milliradian level.

[0038] More features and advantages of the embodiments of the present disclosure will be further described in the following specific implementation methods. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] The accompanying drawings constituting a part of the embodiments of the present disclosure are used to provide a further understanding of the embodiments of the present disclosure. The illustrative embodiments of the present disclosure and their descriptions are used to explain the present disclosure and do not constitute an improper limitation on the present disclosure. In the accompanying drawings:

[0040] Figure 1 A schematic diagram of the structure of an X-ray parallel beam light source system disclosed in an embodiment of the present disclosure;

[0041] Figure 2 A schematic diagram of the working principle of the parallel X-ray beam confinement system in the embodiment of the present disclosure;

[0042] Figure 3 is a schematic diagram of the X-ray confinement principle in an embodiment of the present disclosure;

[0043] Figure 4 Schematic diagram of the relative positions of beam reflections and beam blockers at both ends of the entrance and exit of the X-ray reflector in the embodiment of the present disclosure.

[0044] Description of Reference Numerals

[0045] 1 Light source focal spot

[0046] 2 X-ray mirrors

[0047] 3 Beam Blocker

[0048] 4 Positioning slots

[0049] 5. Radiation shielding sleeve

[0050] D Light source focal spot size

[0051] ID X-ray mirror entrance diameter

[0052] OD X-ray mirror outlet diameter

[0053] FX-ray reflector focal length

[0054] LX-ray reflector length DETAILED DESCRIPTION

[0055] The following will be combined with the drawings in the embodiments of the present disclosure to clearly and completely describe the technical solutions in the embodiments of the present disclosure. Obviously, the described embodiments are only part of the embodiments of the present disclosure, not all of the embodiments. Based on the embodiments in the present disclosure, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present disclosure.

[0056] It should be noted that, in the absence of conflict, the embodiments of the present disclosure and the features therein may be combined with each other.

[0057] Combine the following Figures 1 to 4 , further illustrating the embodiments of the present disclosure:

[0058] X-ray parallel beam light source system embodiment:

[0059] like Figure 1 and Figure 2 As shown, this embodiment discloses an X-ray parallel beam light source system, which includes: an X-ray light source, an X-ray collimator, a ray shielding sleeve, a beam blocker and a detector, wherein:

[0060] The shape of the X-ray is parabolic, and the X-ray light source is arranged at the focus of the parabolic X-ray collimator, so that the light beam emitted by the X-ray light source can complete a single total reflection in the X-ray collimator.

[0061] A ray receiving chamber is provided inside the ray shielding sleeve, and a collimator embedding interface is provided in the ray receiving chamber on a side close to the light source for arranging the X-ray collimator.

[0062] The beam blocker is arranged in the positioning slot inside the radiation shielding sleeve and is located behind the outlet of the X-ray collimator, and is used to block the direct light passing through the X-ray collimator and to block part of the divergent beam to reduce the divergence.

[0063] The detector is arranged at the rear end of the ray receiving chamber, and is used to detect the intensity of the exit beam of the X-ray collimator. The relative position of the X-ray collimator and the X-ray light source is adjustable, and is adjusted based on the intensity of the exit beam received by the detector. When the intensity of the exit beam reaches the maximum, the light source system is collimated.

[0064] In this embodiment, the system needs to be collimated during use. The collimation method is mainly to use a detector, such as a proportional counter, to measure the intensity of the light beam at the collimator outlet, to move the relative position of the collimator and the light source and measure the light beam intensity. When the intensity reaches the maximum, the system is considered to be collimated. The X-ray collimator in this embodiment reaches the best working state after collimation. The beam divergence is related to the focal spot size of the light source used, and can generally reach the sub-milliradian level.

[0065] It should be noted that, in this embodiment, the parallel beam divergence that can be achieved after the reflector reflects the incident X-rays is determined according to the focal spot size of the light source used and the geometric relationship between the reflector, and the position of the beam blocker is determined according to the relative position of the light source and the reflector. In the above X-ray parallel beam light source system, the X-ray collimator used can greatly improve the utilization efficiency of the light source beam, effectively control the divergence within a very small range, and improve the utilization efficiency of the X-ray light source beam.

[0066] As an optional implementation, in the above embodiment, the X-ray collimator can adopt a single capillary glass tube X-ray reflector, which is parabolic in shape, and the inlet of the X-ray reflector is close to the front end outer wall of the radiation shielding sleeve, and the outlet is close to the front end of the radiation receiving chamber.

[0067] In an optional embodiment, a heavy metal oxide film is coated on the inner surface of the above-mentioned X-ray reflector so that the X-ray reflector can confine X-rays in a wider energy range, such as 0 to 130 keV, to form annular X-rays with ultra-small divergence, and the divergence that can be obtained can reach sub-milliradian level.

[0068] The above-mentioned embodiment can utilize atomic layer deposition technology to plate heavy metal compounds on the inner wall of a single total reflection parabolic single glass capillary X-ray reflector, thereby changing the reflection characteristics of the inner wall of the reflector to X-rays, thereby increasing the upper limit of the energy of the reflector reflecting X-rays, and obtaining the ability to confine high-energy X-rays (such as greater than 35keV).

[0069] As an optional implementation, in the above embodiment, the radiation shielding sleeve may be a cylindrical heavy metal shielding sleeve, wherein the inner diameter of the radiation shielding sleeve is equal to or slightly larger than the outlet diameter of the X-ray reflector. Optionally, the radiation shielding sleeve may be a lead shell.

[0070] As an optional implementation, in the above embodiment, the beam blocker can be a heavy metal circular slice, and its thickness T is 0.2mm to 0.5mm. The diameter of the beam blocker is equal to or slightly smaller than the entrance diameter of the X-ray reflector. The beam blocker is fixed in the ray shielding sleeve by a material transparent to X-rays, and the center of the beam blocker is located on the center line of the ray shielding. Optionally, the beam blocker is a lead X-ray beam blocker.

[0071] As an optional implementation, the beam blocker is fixedly arranged behind the exit of the X-ray reflector by an annular polymer compound and the positioning slot. For example, the lead beam blocker can be fixed by the annular polymer compound slot at about 0.5 cm behind the exit of the reflector. The system needs to be strictly collimated, so a substance "transparent" to X-rays, such as a polymer compound, is used to fix the beam blocker in the center of the sleeve.

[0072] In the above embodiment, the sizes of the beam stop and the cylindrical shielding sleeve are described as follows:

[0073] 1) To block the direct light from the reflector, the diameter of the beam blocker should be equal to or slightly smaller than the reflector entrance. If it is larger, the parallel light intensity will be reduced, and if it is smaller, the divergence will be slightly increased.

[0074] 2) The inner diameter of the sleeve should be equal to or slightly larger than the reflector outlet. If it is smaller, the intensity of parallel light will be reduced, and if it is larger, the divergence will be slightly increased.

[0075] The above is a description of the composition of the X-ray parallel beam light source system disclosed in the present invention. Figure 3 and Figure 4 , the principle of X-ray confinement of the X-ray parallel beam light source system is further explained as follows:

[0076] Reference Figure 3 , which illustrates the X-ray confinement principle of this embodiment. In this embodiment, the X-ray light source is placed in front of the entrance of the X-ray reflector 2, and its position is accurately placed at the focus of the parabolic X-ray reflector 2 to ensure that the rays emitted by the light source are reflected once on the reflector.

[0077] Here, taking a certain point R on the reflector as an example, the ray emitted by the light source is totally reflected when it reaches point R. According to the geometric relationship, the ray emitted from the center of the light source (represented by the long dashed line in the middle) is reflected at point R and then emitted in parallel. The ray emitted from other positions has a certain divergence angle relative to the parallel emitted light beam after being reflected at point R. The maximum divergence angle is as follows: Figure 3 As shown in α, where α can be determined by the geometric relationship: In this embodiment, the parabola equation is y 2 =2px, the focal spot size of the light source is D, and the coordinate of R is (x, y). According to the geometric relationship, the divergence α can be expressed as: D / (xp / 2).

[0078] Reference Figure 4 , which shows the reflection at both ends of the reflector inlet and outlet of this embodiment. Figure 4 As shown: For a fixed focal spot size light source, the divergence of the reflected beam decreases as X increases, and the maximum value is limited by the focal length of the reflector (F). The maximum value of the divergence is: D / F, and the minimum value is: The minimum reflection angle β for producing parallel light is approximately 2p / OD.

[0079] According to the principle of total X-ray reflection, there is a relationship between the critical reflection angle θ and the reflection energy Es as shown in the following formula: Where ρ is the density of the material on the reflecting surface. Therefore, the highest energy that can be reflected can be estimated as:

[0080] In order to better reduce the divergence, in this embodiment, a beam blocker 3 and a ray shielding sleeve 5 are arranged at the rear end of the reflector 2. The beam blocker 3 is a heavy metal circular slice with a thickness T of 0.2mm to 0.5mm. In this embodiment, the blocker size Z should be approximately equal to the entrance diameter of the X-ray reflector, ID is the entrance diameter of the X-ray reflector, OD is the exit diameter of the X-ray reflector, L is the length of the X-ray reflector, and F is the focal length of the X-ray reflector.

[0081] In this embodiment, the beam blocker 3 is made of a polymer material and is fixed inside the radiation shielding sleeve through a positioning slot 4. The position of the beam blocker 3 needs to block and reduce a portion of the divergence of the light beam while blocking the direct light passing through the entrance. Therefore, the distance S between the beam blocker and the outlet of the X-ray reflector is ≥2(OD-ID)(F+L) / D. At this time, the divergence of the annular light beam is: D / 2F+(OD-ID) / 2(S+T).

[0082] Here, it should be noted that for a small focal spot light source with a focal spot size D of micrometer level, when S is too large (such as ~2m), it does not meet the requirements of actual production and use, so the beam blocker can be placed at an appropriate position after the reflector exit.

[0083] In addition, in order to effectively reduce some of the divergence, the value of S should be matched with the length of the shielding sleeve, refer to Figure 2 , which shows the overall structure of this embodiment and the situation of constraining the micro-focus light source rays, where Pl is the length of the shielding sleeve. The light beams in the dark gray areas on both sides represent the reflected light beams, and the light gray light beams in the middle area represent the direct light.

[0084] In this embodiment, in order to reduce the divergence of part of the light while meeting the actual manufacturing and use requirements (such as the shielding sleeve cannot be too long), the inner diameter of the sleeve can be set to be equal to OD, so as to block half of the divergent light after reflection while not blocking the parallel light after reflection. In fact, the focal spot size D of the light source is much smaller than other data, so P1 can be approximated as

[0085] In summary, by using the structure disclosed in the above embodiments, the divergence of the annular light beam can be effectively constrained to D / 2(F+L), and the width of the annular parallel light is

[0086] For ease of understanding, the above X-ray parallel beam light source system is further described below with reference to an example:

[0087] In this example, the X-ray light source is a tungsten target micro-focus light source with a focal depth of 16.5 mm and a focal spot size of 20 μm; the inner wall of the X-ray reflector is plated with a hafnium oxide film of about 50 nm; the focal length P of the X-ray reflector is 0.5, the entrance diameter and the exit diameter are 800 μm and 1020 μm respectively, the length L is 10 cm, and the focal length F is 16 cm; the diameter of the beam blocker is 800 μm, the thickness is 200 μm, and the distance S between the beam blocker and the exit of the X-ray reflector is 0.5 cm; the inner diameter of the ray shielding sleeve is 1020 μm, and the length Pl is 8 cm; the energy range of the annular parallel beam that can be constrained is about 5 keV to 60 keV, and the divergence of the annular parallel beam is about 40 μrad.

[0088] X-ray collimator embodiments

[0089] The above embodiments exemplarily illustrate the X-ray parallel beam light source system. The following is an explanation of the parabolic single glass capillary X-ray reflector in the above embodiments:

[0090] The X-ray collimator in this embodiment is a single capillary glass tube X-ray reflector, which is parabolic in shape. The inner surface of the single capillary glass tube X-ray reflector is coated with a layer of heavy metal oxide by atomic deposition, which is used to broaden the energy range of X-rays reflected by the reflector, and the energy range of X-rays that can be constrained is 0 to 130 keV.

[0091] In this embodiment, a layer of heavy metal oxide (~50nm) is plated on the inner surface of the reflector using atomic layer deposition technology to broaden the energy range of the reflector to reflect X-rays. The selection of heavy metal oxide is determined according to actual use requirements. The inventor designed and drew a single total reflection parabolic single capillary glass X-ray reflector to achieve effective collimation of the X-ray light source while reducing the divergence. The mother tube uses a cylindrical hollow glass tube, and the inner wall is purified before drawing to avoid impurity particles on the tube wall causing the inner wall roughness to increase during the drawing process, thereby avoiding affecting the measurement results. During the drawing process, the shape of the reflector is detected by a laser rangefinder, and the drawing process is adjusted in real time to control the surface shape error below 10μrad.

[0092] As an optional implementation, a parabolic single glass capillary X-ray reflector may have the following parameter characteristics:

[0093] The focal length of the X-ray reflector is P, and 0.5≤P≤1, the length of the X-ray reflector ranges from 5cm to 10cm, and the diameter of the inlet and outlet ranges from 400μm to 1100μm. Optionally, the inner wall of the X-ray reflector is plated with a hafnium oxide film no thicker than 50nm.

[0094] The focal length P of the parabolic single glass capillary X-ray reflector is generally set between 0.5 and 1, the length is between 5 cm and 10 cm (depending on actual needs, in theory, the longer the length, the greater the intensity of the focused parallel beam), and the inlet and outlet diameters are approximately between 400 μm and 1000 μm.

[0095] Based on the above embodiments, the technical solution disclosed in this disclosure has the following technical effects compared with the prior art:

[0096] 1) Compared with divergent slits or collimating apertures, the X-ray collimators in the above embodiments can greatly improve the utilization efficiency of the light source beam, while effectively controlling the divergence within a very small range.

[0097] 2) Compared with the multilayer film and polycapillary parallel beam lens, the X-ray collimator in the above embodiments can constrain X-rays in a wide energy range, and the utilization efficiency of the light source beam is higher.

[0098] It should be understood by those skilled in the art that the above-mentioned information processing devices of the present disclosure can be implemented by general-purpose computing devices, they can be concentrated on a single computing device, or distributed on a network composed of multiple computing devices, and optionally, they can be implemented by program codes executable by computing devices, so that they can be stored in a storage device and executed by the computing device, or they can be made into individual integrated circuit modules, or multiple modules or steps therein can be made into a single integrated circuit module for implementation. In this way, the present disclosure is not limited to any specific combination of hardware and software. The storage device is a non-volatile memory, such as: ROM / RAM, flash memory, disk, optical disk, etc.

[0099] The above description is only a preferred embodiment of the present disclosure and is not intended to limit the present disclosure. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present disclosure should be included in the protection scope of the present disclosure.

Claims

1. An X-ray parallel beam light source system, characterized in that: include: X-ray source; The X-ray light source is a tungsten target micro-focus light source; An X-ray collimator, which is parabolic, and the X-ray light source is arranged at the focus of the parabolic X-ray collimator so that the X-rays emitted by it complete a single total reflection in the X-ray collimator; The ray shielding sleeve has a ray receiving chamber in its interior; a collimator embedding interface is correspondingly provided in the ray receiving chamber on a side close to the light source for setting the X-ray collimator; A beam blocker is arranged in the positioning slot inside the radiation shielding sleeve and is located behind the outlet of the X-ray collimator, and is used to block the direct light passing through the X-ray collimator and to block part of the divergent beam to reduce the divergence, thereby constraining a circular parallel X-ray beam; A detector, arranged at the rear end of the ray receiving chamber, for detecting the intensity of the exit beam of the X-ray collimator; The relative position of the X-ray collimator and the X-ray light source is adjustable, and is adjusted based on the intensity of the exit light beam received by the detector, and the light source system is collimated when the intensity of the exit light beam reaches a maximum; The X-ray collimator is a single capillary glass tube X-ray reflector, which is parabolic in shape and is a collimator that can form an annular parallel X-ray beam; the divergence of the annular parallel beam is 40 μrad, and the energy range of the annular parallel beam is 5 keV to 60 keV; The inlet of the X-ray reflector is in close contact with the front end outer wall of the radiation shielding sleeve, and the outlet is in close contact with the front end of the radiation receiving chamber; and / or the inner surface of the X-ray reflector is coated with a heavy metal oxide film layer for confining X-rays with an energy range of 0 to 130 keV, so as to obtain a circular parallel X-ray beam with a divergence at the sub-milliradian level; The radiation shielding sleeve is a cylindrical heavy metal shielding sleeve, and the inner diameter of the radiation shielding sleeve is equal to or slightly larger than the exit diameter of the X-ray reflector; and / or the beam blocker is a heavy metal circular slice, and its thickness T is 0.2mm to 0.5mm; the diameter of the beam blocker is equal to or slightly smaller than the entrance diameter of the X-ray reflector; wherein the beam blocker is fixed in the radiation shielding sleeve by a material transparent to X-rays, and the center of the beam blocker is located on the center line of the radiation shielding.

2. The X-ray parallel beam light source system according to claim 1, characterized in that: The radiation shielding sleeve is a lead shell; and / or The beam blocker is a lead X-ray beam blocker, which is composed of an annular polymer compound and the positioning groove, and is fixedly arranged behind the outlet of the X-ray reflector.

3. The X-ray parallel beam light source system according to claim 1 or 2, characterized in that: ； The distance between the beam blocker and the exit of the X-ray reflector is S, S≥2(OD-ID)(F+L) / D; the length of the radiation shielding sleeve is Pl, and Wherein, D is the size of the focal spot of the X-ray light source, ID is the entrance diameter of the X-ray reflector, OD is the exit diameter of the X-ray reflector, L is the length of the X-ray reflector, and F is the focal length of the X-ray reflector.

4. The X-ray parallel beam light source system according to claim 3, characterized in that: The width of the annular parallel X-ray beam is d, and The divergence constraint of the annular parallel X-ray beam is:

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