A high-energy x-ray target

Abstract

The application discloses a high-energy X-ray target, relates to the technical field of X-ray imaging and detection equipment, and comprises a tungsten target, a water cooling system and a double-layer filter, the front surface of the tungsten target is a receiving surface for receiving an electron beam, the back surface is a emitting surface for emitting an X-ray beam, the water cooling system comprises a cooling water pipe, the cooling water pipe is provided with a heat transfer surface which is attached to the edge of the tungsten target, the heat transfer surface is an arc surface along the length direction of the cooling water pipe and is a plane along the width direction, one end of the cooling water pipe is a cooling water inlet for feeding in cooling water, and the other end is a hot water outlet for discharging hot water, and the double-layer filter is opposite to the emitting surface of the tungsten target. Compared with the prior art, the application has more excellent cooling performance, the double-layer filter is arranged to harden the outgoing X-ray, the average energy is improved, and the X-ray detection precision is increased.

Description

Technical Field

[0001] The present invention relates to the technical field of X-ray imaging and detection equipment, and in particular to a high-energy X-ray target. Background Art

[0002] The performance of the X-ray target determines the quality of the X-rays emitted by the Bremsstrahlung X-ray source and the overall performance of the equipment. In high-energy X-ray imaging and nondestructive testing equipment, the small beam size results in high localized power density and concentrated heat load on the target. When inspecting large, high-density objects, the energy spectrum hardens as the beam passes through the object, resulting in reduced measurement accuracy.

[0003] At present, Zhang Yaofeng and others have carried out the design of high-energy X-ray targets based on a high-power electron linear accelerator with an energy of 9MeV and an average flux of 125μA. The W target has a diameter of 10mm, and the outer periphery of the W target is made of Cu with high thermal conductivity. The cooling system adopts water cooling. The cooling water pipe is attached to the Cu support plate at the edge of the W target. The material is aluminum with an inner diameter of 5mm and a semicircular cross-section. The cooling water can directly contact the Cu support plate. COMSOL simulation shows that the maximum temperature of the target material after long-term irradiation is about 970℃ and the minimum temperature is about 180℃.

[0004] Currently, the above-mentioned use of the Cu support plate as a heat conduction medium between the external water and the W target adds an additional heat conduction medium, resulting in a poor cooling effect, and no hardening of the emitted X-rays. Summary of the Invention

[0005] The present invention provides a high-energy X-ray target comprising a water cooling system and a double-layer filter, which is used to reduce thermal damage to the target body and harden high-energy X-rays, thereby improving X-ray detection accuracy.

[0006] The technical solution adopted by the present invention is as follows:

[0007] A high-energy X-ray target comprises a tungsten target, a water cooling system, and a double-layer filter. The front surface of the tungsten target is a receiving surface for receiving electron beams, and the back surface is an emitting surface for emitting X-ray beams. The water cooling system comprises a cooling water pipe. The cooling water pipe is provided with a heat transfer surface attached to the edge of the tungsten target. The heat transfer surface is an arcuate surface along the length of the cooling water pipe and a flat surface along the width. One end of the cooling water pipe is a cooling water inlet for introducing cooling water, and the other end is a hot water outlet for discharging hot water. The double-layer filter directly faces the emitting surface of the tungsten target.

[0008] In a preferred embodiment of the present invention, all of the tungsten target except the receiving surface and the emitting surface are in contact with the heat transfer surface, which neither affects the reception of the electron beam nor the emission of the X-ray beam, nor can it ensure that the cooling water pipe has extremely high heat transfer efficiency.

[0009] In a preferred embodiment of the present application, the cooling water pipe is an aluminum pipe.

[0010] In a preferred embodiment of the present application, the double-layer filter includes a first filter and a second filter, the first filter is located between the tungsten target and the second filter and is attached to the second filter, the first filter and the tungsten target are in a gap fit; the first filter is made of one of bismuth, lead and tin, and the second filter is made of one of iron, copper and aluminum.

[0011] In a preferred embodiment of the present application, the tungsten target, the cooling water pipe and the double-layer filter are all placed in a shielding body, the shielding body is sequentially provided with a target body mounting cavity and a ray emitting channel connected to the target body mounting cavity from left to right; the tungsten target is placed in the target body mounting cavity and its emitting surface faces the ray emitting channel; the double-layer filter is clamped in the ray emitting channel.

[0012] In a preferred embodiment of the present application, the water cooling system further includes a water pump; the outlet of the water pump is connected to the cooling water inlet, and the inlet is connected to a cold water source.

[0013] Compared with the prior art, the present application has the following beneficial effects:

[0014] The cooling water pipe is provided with a heat transfer surface attached to the edge of the tungsten target, the heat transfer surface is an arc surface along the length direction and the width direction of the cooling water pipe, has more excellent cooling performance, and the tungsten target can still ensure that the target body temperature is lower than the temperature of the target body in the background technology under higher electron beam bombardment;

[0015] The double-layer filter is provided to harden the outgoing X-rays, improve the average energy and increase the X-ray detection accuracy.

[0016] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the following embodiments of the present application are described in detail below, and the accompanying drawings are described as follows. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments, and it should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation on the scope, and for those skilled in the art, other related drawings can also be obtained without creative labor on the basis of these drawings.

[0018] Figure 1 is a main schematic view of a high-energy X-ray target structure;

[0019] Figure 2 is a left view of a high-energy X-ray target structure.

[0020] In the figure: 1 - cooling water pipe, 11 - cooling water inlet, 12 - hot water outlet, 2 - tungsten target, 3 - first filter, 4 - second filter, 5 - electron beam, 6 - X-ray beam, 7 - shielding body. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments.

[0022] Please refer to Figure 1 and Figure 2 The present application discloses a high-energy X-ray target, comprising a tungsten target 2, a water cooling system and a double-layer filter. The front surface of the tungsten target 2 is a receiving surface for receiving an electron beam 5, and the back surface is an emitting surface for emitting an X-ray beam 6 (>1 MeV). The water cooling system comprises a cooling water pipe 1. The cooling water pipe 1 is provided with a heat transfer surface which is attached to the edge of the tungsten target 2. The heat transfer surface is arc-shaped along the length direction of the cooling water pipe 1 and is planar along the width direction. One end of the cooling water pipe 1 is a cooling water inlet 11 for passing in cooling water, and the other end is a hot water outlet 12 for discharging hot water. The double-layer filter is opposite to the emitting surface of the tungsten target 2.

[0023] In the present application, the tungsten target 2 is in contact with the heat transfer surface except for the receiving surface and the emitting surface, which does not affect the receiving of the electron beam 5 and the emitting of the X-ray beam 6, and can ensure that the cooling water pipe 1 has a very high heat transfer efficiency. The tungsten target 2, the cooling water pipe 1 and the double-layer filter are all placed in a shielding body 7. The shielding body 7 is provided with a target body mounting cavity and a ray emitting channel connected to the target body mounting cavity from left to right. The tungsten target 2 is placed in the target body mounting cavity, and its emitting surface faces the ray emitting channel. The double-layer filter is clamped in the ray emitting channel. The cooling water pipe 1 is an aluminum pipe. The double-layer filter comprises a first filter 3 and a second filter 4. The first filter 3 and the second filter 4 are nested in the shielding body 7. The first filter 3 is located between the tungsten target 2 and the second filter 4, and is attached to the second filter 4. The first filter 3 and the tungsten target 2 are in clearance fit. The first filter 3 is made of one of bismuth, lead and tin. The second filter 4 is made of one of iron, copper and aluminum.

[0024] The high-energy X-ray target uses high-energy electron beam 5 to bombard tungsten target 2, and Bremsstrahlung occurs in tungsten target 2 to generate a large amount of thermal energy and high-energy X-ray beam 6. The thermal energy is deposited in tungsten target 2 and is transmitted to cooling water pipe 1 around tungsten target 2, cooling water continuously enters cooling water pipe 1 from cooling water inlet 11, and then is discharged from hot water outlet 12, thereby taking away a large amount of thermal energy in tungsten target 2 and maintaining the normal operation of tungsten target 2; high-energy X-ray beam 6 is emitted from tungsten target 2 and is hardened by double-layer filter, thereby improving the average energy of X-ray.

[0025] The preferred embodiments of the present application have been described above, but the present application is not limited to the above-mentioned embodiments, and various modifications and changes can be made by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A high-energy X-ray target, comprising a tungsten target, wherein the front surface of the tungsten target is a receiving surface for receiving an electron beam, and the back surface is an emitting surface for emitting an X-ray beam, characterized in that: The device also includes a water cooling system and a double-layer filter. The water cooling system includes a cooling water pipe. The cooling water pipe is provided with a heat transfer surface attached to the edge of the tungsten target. The heat transfer surface is an arc-shaped surface along the length of the cooling water pipe and a flat surface along the width. One end of the cooling water pipe is a cooling water inlet for introducing cooling water, and the other end is a hot water outlet for discharging hot water. The double-layer filter directly faces the emission surface of the tungsten target. The double-layer filter includes a first filter and a second filter. The first filter is located between the tungsten target and the second filter and is attached to the second filter. The first filter and the tungsten target are gap-matched. The first filter is made of one of bismuth, lead, and tantalum, and the second filter is made of one of iron, copper, and aluminum. The tungsten target, cooling water pipe and double-layer filter are all placed in a shielding body.

2. The high energy X-ray target according to claim 1, characterized in that The tungsten target is in contact with the heat transfer surface except for the receiving surface and the emitting surface.

3. The high energy X-ray target according to claim 1, characterized in that The cooling water pipe is an aluminum pipe.

4. The high energy X-ray target according to claim 1, wherein The shielding body is provided with a target mounting cavity and a ray emission channel connected to the target mounting cavity from left to right; the tungsten target is placed in the target mounting cavity, and its emission surface faces the ray emission channel; the double-layer filter is clamped in the ray emission channel.

5. The high energy X-ray target according to claim 1, wherein The water cooling system further comprises a water pump; the outlet of the water pump is connected to the cooling water inlet, and the inlet is connected to a cold water source.

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