CN212848300U

CN212848300U - Radiation conversion target assembly for high dose yield circumferential irradiation tube

Info

Publication number: CN212848300U
Application number: CN202021863308.6U
Authority: CN
Inventors: 周义春
Original assignee: Chengdu Ruiming Hesheng Technology Co ltd
Current assignee: Changzhou Huashu Technology Co ltd
Priority date: 2020-08-31
Filing date: 2020-08-31
Publication date: 2021-03-30
Anticipated expiration: 2030-08-31

Abstract

The utility model discloses a radiation conversion target subassembly for high dose yield circumference irradiation ray tube, including the supporting pedestal of cylinder the outside of supporting pedestal is provided with a plurality of cooling tube, is provided with round radiation conversion target in the supporting pedestal inboard. The annular radiation conversion target cylindrical structure of the utility model has high conversion efficiency material, optimized radiation thickness and oversized focus, simultaneously utilizes reflection and transmission rays, and greatly improves the dose yield of the ray tube compared with the prior plate-shaped radiation structure; moreover, the radiation conversion target adopts a cylindrical structure, so that the radiation conversion target has effective radiation field distribution in the circumferential direction of 360 degrees and the axial direction of 180 degrees; because the area of the radiation conversion target is large, the thermal power of the unit area of the radiation conversion target is small, the radiation can be effectively dissipated through the direct cooling of the supporting substrate and the cooling pipeline, and the reliability of the radiation conversion target and the service life of the ray tube are obviously improved.

Description

Radiation conversion target assembly for high dose yield circumferential irradiation tube

Technical Field

The utility model relates to an ionizing radiation irradiation equipment technical field, concretely relates to radiation conversion target subassembly that is used for high dose yield circumference irradiation ray tube.

Background

Vacuum electronic device for generating X-ray by using high-speed electrons to impact metal target surface. The X-ray tube can be classified into a gas tube and a vacuum tube according to the manner of generating electrons. X-ray tube inflatable X-ray tubes were early X-ray tubes. In 1895, X-rays were found in kruse tube experiments performed by w.c. roentgen. The kruse tube was the earliest gas-filled X-ray tube. After the tube is connected with high voltage, the gas in the tube is ionized, electrons escape from the cathode under the bombardment of positive ions, and the electrons are accelerated and then impact on a target surface to generate X rays. The inflatable X-ray tube has small power, short service life and difficult control, and is rarely applied later. In 1913, a vacuum X-ray tube was invented by w.d. kuligi. The vacuum degree in the tube is not lower than 10-4 Pa. The cathode is a directly-heated spiral tungsten wire, and the anode is a metal target inlaid on the end face of a copper block. The target material and the electron beam energy are chosen according to the use of the tube, tungsten being commonly used as the target material. In some applications, silver, palladium, rhodium, molybdenum, copper, nickel, cobalt, iron, chromium, and the like are also used. The working temperature of the cathode is about 2000K, and emitted electrons are accelerated by tens of thousands to hundreds of thousands of volts and then impact the target surface. The cathode is surrounded by a metal hood which is slotted at the front end. The metal shield is at a potential equal to or lower than the cathode, forcing the electrons to focus in a narrow region on the target surface, forming a focal spot. The X-rays radiate from the focal spot in all directions and exit through a window in the wall of the tube. The window is typically made of beryllium, aluminum, or lightweight glass, with beryllium being the best.

The ray tube has been widely applied in the fields of industry, medical treatment and the like, and has achieved great social and economic benefits. The reliability and radiation uniformity of a tube are important indicators of its performance. On the one hand, a large amount of rays (including primary rays and various secondary rays) generated by the tube during operation can bombard the insulation part of the tube, and the insulation damage can be caused by long-time action, so that the reliability of the tube is seriously affected, such as a large amount of electrons and photons generated by the tube during operation, especially a large-dose tube, and the internal radiation bombardment environment is complicated. On the other hand, the structure of the tube is complicated, so that the electric field distribution in the tube is not uniform, the distribution of charged particle beams is not uniform, the beam target effect is not uniform, and the radiation uniformity of the tube is seriously influenced.

Irradiation processing using rays has been widely used in the fields of scientific research and industrial production, including food processing, biological irradiation, material modification, blood irradiation, and the like. Conventional irradiation sources include radioisotopes and high-energy accelerators, wherein the radioisotopes have a risk of nuclear leakage and are strictly controlled, and the high-energy accelerators have a complex and large structure and high cost. These factors have greatly limited the application and spread of irradiation processing. The irradiation ray tube is used as a novel irradiation source, such as an irradiation X-ray tube, has the advantages of controllable radiation, compact structure, lower cost, flexible use and the like, can replace the traditional irradiation source, and promotes the application and development of irradiation processing. The traditional ray tube is mainly used in the fields of medical imaging, industrial detection and the like, the action focus of a radiation conversion target and a charged particle beam is small, the area of the traditional ray tube is generally in the order of square millimeters, only part of generated back scattered rays or part of generated transmitted rays are utilized, and a considerable part of rays are lost, so that the radiation dose yield is low and the radiation angle is small; meanwhile, the small focus causes low heat dissipation efficiency, and the reliability of the ray tube is affected.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a radiation conversion target subassembly for high dose yield circumference irradiation ray tube, solve among the prior art that the radiation dose yield is little, little focus leads to the poor problem of reliability.

The utility model discloses a following technical scheme realizes:

a radiation conversion target assembly for a high dose yield circumferential irradiation ray tube includes a cylindrical support base, a plurality of cooling channels disposed on an outer side of the support base, and a ring of radiation conversion targets disposed on an inner side of the support base. The utility model discloses a cylindrical support base produces the main part as the radiation of irradiation ray tube, will radiate the conversion target and set up in the support base inboard, its one circle surrounds and forms overall structure, when the emitter lies in its axial, can form 360 radiation production on the circumference, cyclic annular radiation conversion target cylinder structure has high conversion efficiency material, the radiation thickness of optimization and super large focus, utilized reflection and transmission line simultaneously, for current plate-shaped radiation structure, the dose yield of ray tube has been improved greatly; moreover, the radiation conversion target adopts a cylindrical structure, so that the radiation conversion target has effective radiation field distribution in the circumferential direction of 360 degrees and the axial direction of 180 degrees; because the area of the radiation conversion target is large, the thermal power of the unit area of the radiation conversion target is small, the radiation can be effectively dissipated through the direct cooling of the supporting substrate and the cooling pipeline, and the reliability of the radiation conversion target and the service life of the ray tube are obviously improved.

The outside of the supporting base is provided with a plurality of reinforcing rib structures protruding outwards, and the cooling pipeline is located in the reinforcing rib structures. Through setting up the cooling tube in the strengthening rib, rationally utilized its space, greatly reduced holistic weight, reduced manufacturing cost.

The reinforcing rib structure equipartition in the support base outside, and with support base structure as an organic whole.

The number of the cooling pipelines is about 4-12, and the inner diameter of the cooling pipelines is 6-12 mm. The cooling pipe is used as a main heat dissipation part, a material with high heat transfer coefficient, such as copper and aluminum, is fully contacted with the supporting substrate, and the cooling pipe and the supporting substrate are in an integral structure, so that heat transfer is facilitated; the number, distribution and inner diameter of the cooling pipes are designed to meet the radiation requirements of the tube and the dose rate and uniformity of radiation, for example, for a thermal power of several kilowatts, the number of the cooling pipes is about 4-12, the inner diameter is 6-12mm, and the cooling pipes are uniformly distributed on the outer surface of the support substrate.

The thickness of the radiation conversion target is 1-4 times of the range of the charged particle beam, and the area of the radiation conversion target is 1-1.2 times of the bombardment area of the charged particle beam. Further, the utility model discloses optimize the thickness to the radiation conversion target, through the experiment and the theoretical analysis of tens of thousands of groups, reachd the optimal thickness: the thickness of the radiation conversion target is 1-4 times of the range of the charged particle beam, the area of the radiation conversion target is 1-1.2 times of the bombardment area of the charged particle beam, and through optimization of the radiation conversion target, the radiation dose can be improved, meanwhile, the use of precious materials is reduced, the structure is greatly optimized, and the economic value is also reflected.

Compared with the prior art, the utility model, following advantage and beneficial effect have:

1. the utility model discloses a radiation conversion target subassembly for high dose yield circumference irradiation ray tube, the support base that adopts the cylinder produces the main part as the radiation of irradiation ray tube, set up the radiation conversion target in the support base inboard, its one circle surrounds and forms overall structure, when the emitter is located its axial, can form 360 radiation production on the circumference, cyclic annular radiation conversion target cylinder structure, have high conversion efficiency material, the radiation thickness of optimization and super large focus, reflection and transmission line have been utilized simultaneously, for current plate-shaped radiation structure, the dose yield of ray tube has been improved greatly; moreover, the radiation conversion target adopts a cylindrical structure, so that the radiation conversion target has effective radiation field distribution in the circumferential direction of 360 degrees and the axial direction of 180 degrees; because the area of the radiation conversion target is large, the thermal power of the unit area is small, the radiation can be effectively dissipated by directly cooling the coolant of the supporting substrate and the cooling pipeline, and the reliability of the radiation conversion target and the service life of the ray tube are obviously improved;

2. the utility model is used for the radiation conversion target component of the circumferential irradiation ray tube with high dose yield, the cooling tube is arranged in the reinforcing rib, the space of the cooling tube is reasonably utilized, the integral weight is greatly reduced, and the manufacturing cost is reduced;

3. the utility model is used for high dose yield circumference irradiation ray tube's radiation conversion target subassembly through the experiment and the theoretical analysis of ten thousand groups, has reachd the optimal thickness: the thickness of the radiation conversion target is 1-4 times of the range of the charged particle beam, the area of the radiation conversion target is 1-1.2 times of the bombardment area of the charged particle beam, and through optimization of the radiation conversion target, the radiation dose can be improved, meanwhile, the use of precious materials is reduced, the structure is greatly optimized, and the economic value is also reflected.

Drawings

The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention. In the drawings:

FIG. 1 is a schematic structural view of the present invention;

fig. 2 is a sectional view taken along a-a in fig. 1 according to the present invention.

Reference numbers and corresponding part names in the drawings:

1-supporting base, 2-radiation conversion target, 3-cooling pipeline.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in detail with reference to the following embodiments, and the exemplary embodiments and descriptions thereof of the present invention are only used for explaining the present invention, and are not intended as limitations of the present invention.

Examples

As shown in fig. 1 to 2, the radiation conversion target assembly for a high dose yield circumferential irradiation ray tube of the present invention comprises a cylindrical support base 1, wherein a plurality of outwardly protruding reinforcing rib structures are arranged on the outer side of the support base 1, the reinforcing rib structures are hollow, the axis of each reinforcing rib structure is parallel to the axis of the support base 1 to form a cooling pipeline 3, and a circle of radiation conversion target 2 is arranged on the inner side of the support base 1; the support base 1 is used as a support structure and a direct heat dissipation component and is made of high-strength and high-heat-transfer-coefficient materials, such as high-purity oxygen-free copper, pure copper and copper alloy; the structure design meets the requirements of insulation design and vacuum design of an electric vacuum device, and simultaneously needs to meet the dosage rate requirement of rays, the thickness of the cylinder is about 1-5mm, the inner diameter is about 100-200mm, and the height is about 200-500mm, the cooling pipeline 3 is used as a main heat dissipation part, and adopts high heat transfer coefficient materials, such as copper and aluminum, to fully contact with a supporting substrate, and preferably adopts the same material as the supporting substrate 1 and forms an integral structure with the supporting substrate; the design of the number, distribution and inner diameter of the cooling pipelines 3 needs to meet the heat dissipation requirement of the ray tube and the radiation dosage rate and uniformity requirement, for example, for the thermal power of a few kilowatts, the number of the cooling pipelines is about 4-12, the inner diameter is 6-12mm, and the cooling pipelines are uniformly distributed on the outer surface of the supporting substrate; the thickness of the radiation conversion target 2 is about the range or several times of the range of the charged particle beam, preferably 1-4 times, for example, for an electron beam of 200keV, the thickness of the radiation conversion target is about 10-30 micrometers; the area of the radiation conversion target 2 is about the effective bombardment range of the charged particle beam, the area of the radiation conversion target 2 is 1-1.2 times of the bombardment area of the charged particle beam, and compared with the traditional structural design, the focus can be improved by hundreds of times or even higher; the radiation conversion target is a conversion body of rays, and adopts a material with high conversion efficiency, and for the radiation conversion target of X rays, a material with high atomic number, such as gold, tungsten and tantalum, is adopted.

When the radiation conversion target assembly works in the ray tube, charged particle beams bombard the radiation conversion target 2 to lose energy, one part of the energy is converted into rays and is radiated outwards through the supporting base 1 and the cooling pipeline 3 and a coolant flowing through the supporting base and the cooling pipeline, and the other part of the energy is deposited on the radiation conversion target 2 in the form of heat and is then effectively cooled by the coolant in the supporting base 1 and the cooling pipeline 3; the radiation conversion target 2 can generate emission and transmission rays which can penetrate through the support base 1, the cooling pipeline 3 and the coolant flowing through the cooling pipeline, the utilization rate of the rays is high, on the other hand, the support base 1, the cooling pipeline 3 and the coolant flowing through the cooling pipeline have small attenuation to the rays, so that the dose yield of the ray tube is remarkably improved, the support base 1, the cooling pipeline 3 and the coolant flowing through the cooling pipeline directly cool the radiation conversion target 2, the heat dissipation efficiency is high, and the reliability of the ray tube is guaranteed.

The above-mentioned embodiments, further detailed description of the objects, technical solutions and advantages of the present invention, it should be understood that the above description is only the embodiments of the present invention, and is not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the scope of the present invention.

Claims

1. Radiation conversion target assembly for high dose yield circumferential irradiation tubes, comprising a cylindrical support base (1), characterized in that: a plurality of cooling pipelines (3) are arranged on the outer side of the supporting base (1), and a circle of radiation conversion target (2) is arranged on the inner side of the supporting base (1).

2. The radiation conversion target assembly for a high dose yield circumferential irradiation tube of claim 1, wherein: the outer side of the support base (1) is provided with a plurality of reinforcing rib structures protruding outwards, and the cooling pipeline (3) is located in the reinforcing rib structures.

3. The radiation conversion target assembly for a high dose yield circumferential irradiation tube of claim 2, wherein: the reinforcing rib structure is uniformly distributed on the outer side of the support base (1) and is integrated with the support base (1).

4. The radiation conversion target assembly for a high dose yield circumferential irradiation tube of claim 2, wherein: the number of the cooling pipelines (3) is 4-12, and the inner diameter of the cooling pipelines is 6-12 mm.

5. The radiation conversion target assembly for a high dose yield circumferential irradiation tube of claim 1, wherein: the thickness of the radiation conversion target (2) is 1-4 times of the range of the charged particle beam, and the area of the radiation conversion target (2) is 1-1.2 times of the bombardment area of the charged particle beam.