CN103578596B - X ray conversion target - Google Patents

Abstract

The invention discloses a kind of X ray conversion target, it comprises a matrix and a target layer plate, and this matrix comprises that a substrate and is fixedly arranged on the framework on this substrate perisporium, detachable this framework that is connected with of this target layer plate; On this substrate, be fixedly arranged on the affixed guide plate at least one and one end this framework, those guide plates all between this substrate and this target layer plate, and with this substrate, this framework and this target layer plate around being formed with a coolant layer; This coolant layer comprise at least one influent stream road and at least one go out runner, respectively the one end in this influent stream road is used for passing into cooling agent, the other end is with respectively this goes out runner and is connected, respectively this one end that goes out runner is for flowing out cooling agent. The present invention ensure high-power or super high power electron beam convert to the conversion efficiency of X ray high in, realize the temperature stability of conversion target, avoid thermal stress and thermal deformation, improved the service life of conversion target.

Description

X-ray conversion target

technical field

The invention relates to an X-ray conversion target.

Background technique

Due to the advantages of X-rays in penetrability, the radiation industry has put forward an urgent need for electron beam conversion to X-rays. If the high-power 5-10MeV electron beam can be converted into X-rays, its penetration and processing capabilities will be comparable to those of Co-60γ radiation sources. This makes the existing accelerator irradiation device more applicable and enhances its operational flexibility, and can also directly replace part of the Co-60 irradiation device.

However, in the process of converting electron beams into X-rays, the proportion of electron beam energy converted into X-ray energy is relatively small, and more than 80% to 90% of the energy will be released in the form of heat. In order to ensure the conversion efficiency, the thickness of the conversion target is usually relatively small, and the scanning surface of the electron beam is usually limited to a certain extent. Therefore, in order to solve the heat dissipation problem of high-power X-ray conversion in a certain volume, it is necessary to realize efficient heat exchange of the coolant under the limited volume and thickness of the target.

A high-power irradiation accelerator X-ray conversion target is disclosed in the Chinese invention patent application specification CN201310091694.X. As shown in Figures 1-3, the X-ray conversion target includes a target body and a target body cooling device. The target The body includes a tantalum plate 3' and a copper plate 4', the front surface of the tantalum plate 3' is used to receive electron beams and convert them into X-rays, the rear surface of the tantalum plate 3' is welded together with the front surface of the copper plate 4'; the target The body cooling device includes two main cooling pipes 1' and a plurality of branch cooling pipes 2'. The plurality of branch cooling pipes 2' are arranged in parallel and welded on the rear surface of the copper plate 4'. The two main cooling pipes The cooling pipes 1' are respectively welded to the two ends of the branch cooling pipes 2' and communicated with the branch cooling pipes 2', one of the main cooling pipes 1' is used to pass in the cooling liquid, and the other is used to output the cooling liquid . However, the high-power irradiation accelerator X-ray conversion target has the following technical problems:

(1) Multiple cooling pipes are arranged at intervals on the rear surface of the copper plate, making the thickness of the same cross-section of the copper plate uneven, resulting in more X-rays being absorbed at the thicker position, making the conversion target in the forward direction The share of X-rays generated is lost, and the conversion efficiency is reduced;

(2) Electron beams will be transmitted from the position where the mass thickness of the cross-section of the target is thinner, so that during the irradiation process of X-rays, the electron beams will interfere with X-rays and affect the quality of the irradiated products;

(3) The cooling method of the X-ray conversion target adopts a one-way flow channel, which leads to uneven temperature at the inlet and outlet ends of the coolant, resulting in adverse effects of thermal stress and thermal deformation;

(4) This structure cannot realize the direct cooling of the coolant to the conversion parts, and it needs to pass through the cooling pipe wall, the contact surface between the cooling pipe and the copper plate, etc., and the heat exchange capacity will be insufficient.

Contents of the invention

The technical problem to be solved by the present invention is to overcome the defects of low conversion efficiency of X-ray conversion targets in the prior art, interference of electron beams to X-rays, easy generation of thermal stress and thermal deformation, and provide an X-ray conversion target.

The present invention solves the above technical problems through the following technical solutions:

An X-ray conversion target, comprising a base body and a target layer plate, characterized in that the base body includes a base plate and a frame fixed on the peripheral wall of the base plate, and the target layer plate is detachably connected to the frame;

At least one guide plate fixed to one end of the frame is fixed on the base plate, and the guide plates are all located between the base plate and the target plate, and form a circle around the base plate, the frame, and the target plate coolant layer;

The coolant layer includes at least one inlet channel and at least one outlet channel, one end of each inlet channel is used to feed coolant, the other end communicates with each outlet channel, and one end of each outlet channel is used out of the coolant.

In this solution, when the electron beam interacts with the target layer, it is converted into X-rays. Wherein, the target layer plate generates X-rays and also absorbs X-rays. The coolant layer is arranged between the substrate and the target layer, so that the thickness of the same cross-section of the substrate is uniform, which can ensure that the coolant layer and the substrate will pass through the target in the case of high power or ultra-high power requirements for high conversion efficiency. The electron beam transmitted by the laminate is completely absorbed, and most of the remaining electron beam energy will be deposited in the substrate to prevent the electron beam from being transmitted from the substrate, which will interfere with the X-ray irradiation and affect the quality of the irradiated product; in addition , the coolant layer includes an inlet channel and an outlet channel. With this reciprocating flow structure, not only the heat accumulated in the conversion target during operation can be taken away in time, but also the temperature stability of the conversion target can be realized, and thermal stress and thermal stress can be avoided. Deformation improves the service life of the conversion target.

Preferably, the target laminate is connected to the frame by screws, and the target laminate is sealed and connected to the frame through a sealing ring.

In this solution, the above-mentioned structural form is adopted to facilitate disassembly and fixing of the conversion target, and at the same time, it can ensure the sealing of the conversion target and prevent the coolant passing into the coolant layer from overflowing from the side of the base body.

Preferably, the X-ray conversion target further includes a sealing edge assembly, the sealing edge assembly is fixedly connected with the target laminate and the frame, and is located above the target laminate.

In this solution, the setting of the sealing edge assembly can further ensure the fastness and sealing between the target layer plate and the substrate.

Preferably, there are two guide plates, and the two guide plates are arranged in parallel on the base plate.

Preferably, the number of the inlet channel is one, the number of the outlet channel is two, and the inlet channel is located between the two outlet channels.

In this solution, the inlet channel is located between the two outlet channels, so that the flow of the coolant in the target body of the conversion target is reciprocating, which is beneficial to ensure the uniformity of temperature distribution in the conversion target.

Preferably, three through holes are provided on the side wall of the frame, and one end of each of the through holes communicates with a coolant pipeline through a joint assembly, and the other end of one of the through holes is connected with the inlet channel The other ends of the other two through holes communicate with one of the outlet channels respectively.

Preferably, one end of the base plate is provided with three connecting grooves, one end of each connecting groove communicates with one of the through holes, the other end of one of the connecting grooves communicates with the inlet channel, and the other two connect with the through hole. The other end of the groove communicates with one of the outlet channels respectively.

Preferably, the shape of the target layer is arc-shaped.

In this scheme, the shape of the target layer is arc-shaped, that is, the shape of the top surface and the bottom surface of the target layer are both arc-shaped, and the pressure of the high-pressure coolant on the wall points to the outer normal direction, and the tangential tension balance. In this way, the pressure of the coolant causes little deformation to the target in the thickness direction (radial direction). Therefore, there is no need to add an additional fixing structure between the target laminate and the substrate to resist the deformation caused by the high-pressure coolant.

Preferably, each inlet channel and each outlet channel are provided with a group of stripe grooves, each group of stripe grooves includes several stripe grooves, and several stripe grooves are arranged in parallel at intervals along the length direction of the substrate.

In this solution, the above structural form can be used to enhance the heat exchange capacity between the coolant and the matrix.

Preferably, the shape of each stripe groove is herringbone.

On the basis of conforming to common knowledge in the field, the above-mentioned preferred conditions can be combined arbitrarily to obtain preferred examples of the present invention.

The positive progress effect of the present invention is:

The X-ray conversion target of the present invention not only ensures high conversion efficiency of high-power or ultra-high-power electron beams into X-rays, but also realizes the temperature stability of the conversion target, avoids thermal stress and thermal deformation, and improves the service life of the conversion target; in addition , avoiding the transmission of electron beams from the substrate, which interferes with X-rays and affects the quality of irradiated products.

Description of drawings

Fig. 1 is a schematic structural diagram of an X-ray conversion target in the prior art.

FIG. 2 is a top view corresponding to FIG. 1 .

FIG. 3 is an enlarged view of part A in FIG. 2 .

Fig. 4 is a schematic structural diagram of a preferred embodiment of the X-ray conversion target of the present invention.

Fig. 5 is a schematic view of the exploded structure corresponding to Fig. 4 .

FIG. 6 is a top view of the base body in FIG. 5 .

Fig. 7 is a full sectional view corresponding to the front view of Fig. 4 .

Explanation of reference signs:

current technology:

Main cooling pipe: 1′ Cooling pipe: 2′ Tantalum plate: 3′

Copper plate: 4′

this invention:

Substrate: 1 Target laminate: 2 Sealing edge assembly: 3

Screws: 4 Sealing rings: 5 Through holes: 6

Connector components: 7 Inlet runners: 8 Outlet runners: 9

Guide plate: 10 Frame: 11 Connection groove: 12

Substrates: 13

detailed description

A preferred embodiment will be given below, and the present invention will be described more clearly and completely in conjunction with the accompanying drawings.

As shown in FIGS. 4-5 , the X-ray conversion target of the present invention includes a base body 1 and a target layer plate 2 . The base body 1 includes a base plate 13 and a frame 11 fixed on a peripheral wall of the base plate 13 .

Wherein, the target laminate 2 is detachably connected with the frame 11 , and the target laminate 2 is sealed and connected with the frame 11 through a sealing ring 5 . In this embodiment, the target laminate 2 and the frame 11 are connected by screws. Adopting the above-mentioned structural form facilitates disassembly and fixing of the conversion target, and at the same time ensures the sealing of the conversion target, preventing the coolant passed into the coolant layer from overflowing from the side of the base body 1 .

In addition, as shown in FIG. 7 , the X-ray conversion target further includes a sealing edge assembly 3 . The sealing edge assembly 3 is fixedly connected to the target laminate 2 and the frame 11 through several screws 4 , and is located above the target laminate 2 . This can further ensure the tightness and sealing between the target layer plate 2 and the base body 1 .

In addition, as shown in FIG. 6 , the base plate 13 is fixed on at least one guide plate 10 fixed to one end of the frame. The guide plates 10 are located between the base plate 13 and the target plate 2 , and form a coolant layer surrounding the base plate 13 , the frame 11 and the target plate 2 .

Wherein, the coolant layer includes at least one inlet channel 8 and at least one outlet channel 9 . One end of the inlet channel 8 is used to feed coolant, and the other end communicates with each outlet channel to take away the heat in the conversion target in time.

At the same time, one end of each outlet channel 9 is used to flow out the coolant, so as to realize the circulation of the coolant in the target body of the conversion target and ensure the uniformity of the temperature in the conversion target.

In this embodiment, when the electron beam interacts with the target layer plate 2, it is converted into X-rays. Wherein, the target layer plate 2 generates X-rays and absorbs X-rays at the same time. The coolant layer is arranged between the substrate 13 and the target layer plate 2, so that the thickness of the same cross-section of the substrate 13 is uniform, which can ensure that the coolant layer and the substrate are relatively high in the case of high power or ultra-high power requirements for conversion efficiency. 13 completely absorbs the electron beam transmitted through the target layer plate 2, and most of the remaining electron beam energy will be deposited in the substrate 13, so as to prevent the electron beam from being transmitted from the substrate 13, which will interfere with the X-ray irradiation and affect Quality of irradiated products.

In addition, during the whole process of electron beam and conversion target, more than 80% of the energy will be deposited in the target layer 2 and substrate 1 and released in the form of heat, which needs to be cooled in time to ensure the normal working temperature. In this embodiment, the coolant layer includes an inlet channel 8 and an outlet channel 9. With this reciprocating flow structure, not only the heat accumulated in the conversion target during operation can be taken away in time, but also the temperature of the conversion target can be stabilized. Sex, avoid thermal stress and thermal deformation, improve the service life of the conversion target.

Preferably, as shown in FIG. 6 , the number of the guide plates 10 is two, and the two guide plates 10 are arranged on the base plate 13 in parallel. Meanwhile, the number of the inlet channel 8 is one, the number of the outlet channels 9 is two, and the inlet channel 8 is located between the two outlet channels 9 .

In this embodiment, the inlet channel 8 is located between the two outlet channels 9, so that the flow of the coolant in the target body of the conversion target is reciprocating, which is beneficial to ensure the uniformity of temperature distribution in the conversion target.

In addition, as shown in FIG. 5 , three through holes 6 are provided on one side wall of the frame 11 . One end of each through hole 6 communicates with a coolant pipe through a joint assembly 7 respectively. The other end of one of the through holes 6 communicates with the inlet channel 8 , and the other ends of the other two through holes 6 communicate with an outlet channel 9 respectively.

In addition, as shown in FIGS. 5-6 , one end of the substrate 13 is provided with three connecting grooves 12 . One end of each connecting groove 12 communicates with one of the through holes 6 respectively. The other end of one of the connecting grooves 12 communicates with the inlet channel 8 , and the other ends of the other two connecting grooves 12 communicate with one of the outlet channels 9 respectively.

Preferably, as shown in FIG. 5 , the shape of the target layer plate 2 is an arc.

In this implementation, the shape of the target laminate 2 is arc-shaped, that is, the top surface and the bottom surface of the target laminate 2 are both arc-shaped, and the pressure of the high-pressure coolant on the wall points to the outer normal direction. tension balance. In this way, the pressure of the coolant causes little deformation to the target in the thickness direction (radial direction). Therefore, there is no need to add an additional fixing structure between the target layer plate 2 and the base 1 to resist the high-pressure coolant. deformation.

In the actual application process, the material of the target layer 2 not only has the function of generating X-rays, but also has the function of absorbing X-rays. The target layer 2 is made of tantalum material with a thickness of 1 mm, which can ensure that the electron beam under a certain energy Generates the largest share of X-rays.

Further, each of the inlet channels 8 and each of the outlet channels 9 is provided with a set of stripe grooves. Each group of the stripe grooves includes several stripe grooves, and the several stripe grooves are arranged in parallel at intervals along the length direction of the substrate 13 . This can enhance the heat exchange capability between the coolant and the base body 1 . In addition, in this embodiment, the shape of each of the stripe grooves is herringbone.

In summary, the X-ray conversion target of the present invention not only ensures high conversion efficiency of high-power or ultra-high-power electron beams into X-rays, but also realizes the temperature stability of the conversion target, avoids thermal stress and thermal deformation, and improves the efficiency of the conversion target. In addition, the transmission of electron beams from the substrate 13 is avoided, which interferes with X-rays and affects the quality of irradiated products.

Although the specific implementation of the present invention has been described above, those skilled in the art should understand that this is only an example, and the protection scope of the present invention is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principle and essence of the present invention, but these changes and modifications all fall within the protection scope of the present invention.

Claims (9)

1. An X-ray conversion target, comprising a base body and a target layer plate, characterized in that the base body includes a base plate and a frame fixed on the peripheral wall of the base plate, and the target layer plate is detachably connected with the frame ; At least one guide plate fixed to one end of the frame is fixed on the base plate, and the guide plates are all located between the base plate and the target plate, and form a circle around the base plate, the frame and the target plate. coolant layer; The coolant layer includes at least one inlet channel and at least one outlet channel, one end of each inlet channel is used to feed coolant, the other end communicates with each outlet channel, and one end of each outlet channel is used to outflow coolant; The shape of the target layer is arc-shaped, and the shape of the top surface and the bottom surface of the target layer is arc-shaped, and is used to make the pressure of the high-pressure coolant in the coolant layer on the wall of the target layer pointing outward normal and balanced by tangential tension. 2 . The X-ray conversion target according to claim 1 , wherein the target laminate is connected to the frame by screws, and the target laminate is sealed and connected to the frame through a sealing ring. 3. The X-ray conversion target according to claim 1, characterized in that, the X-ray conversion target further comprises a sealing edge assembly, the sealing edge assembly is affixed to the target laminate and frame, and is located on the target above the laminate. 4. The X-ray conversion target according to claim 1, wherein the number of the guide plates is two, and the two guide plates are arranged in parallel on the substrate. 5. The X-ray conversion target according to claim 4, wherein the number of the inlet channel is one, the number of the outlet channels is two, and the inlet channel is located between the two outlet channels . 6. The X-ray conversion target according to claim 5, wherein three through holes are arranged on the side wall of the frame, and one end of each through hole communicates with a coolant pipeline through a joint assembly, The other end of one of the through holes communicates with the inlet channel, and the other ends of the other two through holes communicate with one of the outlet channels respectively. 7. The X-ray conversion target according to claim 6, wherein one end of the substrate is provided with three connecting grooves, one end of each connecting groove communicates with one of the through holes, and the other of one of the connecting grooves One end communicates with the inlet channel, and the other ends of the other two connecting grooves communicate with one of the outlet channels respectively. 8. The X-ray conversion target according to any one of claims 1 to 7, characterized in that, each of the inlet channels and each of the outlet channels is provided with a group of striped grooves, and each group of the striped grooves includes several a plurality of stripe grooves, and several stripe grooves are arranged in parallel at intervals along the length direction of the substrate. 9. The X-ray conversion target according to claim 8, wherein each of the stripe grooves is herringbone in shape.