Irradiation shielding device and linear accelerator system

Abstract

The utility model discloses an irradiation shielding device and a linear accelerator system, the linear accelerator system comprises a linear accelerator and a transmission line, the transmission line comprises a plurality of transmission segments, the two sides of the transmission line are provided with shielding walls, the irradiation shielding device comprises a control unit, an upper shielding body, a lower shielding body and a plurality of shielding assemblies, the upper shielding body is arranged above the transmission line, and a transmission space is arranged between the upper shielding body and the transmission line; the lower shielding body is arranged below the transmission line; the shielding assembly and the conveying line are arranged on a straight line passing through the position of a scanning box of the linear accelerator, the shielding assembly comprises two shielding plates and a lifting motor, and the shielding plates divide a conveying space into a plurality of shielding chambers; the control unit sends a control signal to the lifting motor, and the lifting motor drives the connected shielding plates to lift. According to the utility model, a linear channel type conveying channel can be provided, so that the design achieves the purposes of miniaturization and compactness; the occupied area is reduced and the construction period is shortened.

Description

Technical Field

[0001] The utility model relates to a radiation shielding device and a linear accelerator system. Background Art

[0002] A linear accelerator usually refers to an accelerator that uses a high-frequency electromagnetic field to accelerate particles, and the trajectory of the accelerated particles is a straight line. A high-frequency linear accelerator (HLA) is a device that accelerates charged particles using a high-frequency electric field distributed along a straight track.

[0003] The accelerating cavity in a high-frequency linear accelerator usually uses radio frequency acceleration technology, that is, using a high-frequency electric field to accelerate charged particles. By introducing a high-frequency electric field in the accelerating cavity, the particles can obtain higher energy and speed. High-frequency linear accelerators usually have higher acceleration capabilities and efficiency, so they have advantages in generating high-energy particle beams.

[0004] In the medical field, high-frequency linear accelerators are widely used in radiotherapy to treat cancer and tumors. By generating high-energy electron or photon beams, this accelerator can precisely target tumor cells and deliver high-energy particle beams into the patient's body to destroy malignant cells.

[0005] In the field of industrial production and processing, industrial linear accelerators can play a role in disinfecting and sterilizing products.

[0006] Accelerator irradiation processing equipment uses the generated electron beam to irradiate and sterilize the goods. When the electron beam hits the surface of the goods and the conveyor line, some electrons will be absorbed and some will be scattered, causing the rays to disperse in all directions. The greater the energy of the rays, the stronger the penetration. Therefore, irradiation processing needs to be equipped with a certain radiation shield to absorb the rays and limit their outward diffusion. It is often in the form of a gourd-shaped maze, and the building materials are usually high-grade steel bars and concrete. The typical design building uses more materials and occupies a large area, and the multi-curve conveyor line equipment is difficult to maintain.

[0007] The typical maze form is shown in the figure attached to the specification. Figure 1 and Figure 2 As shown, Figure 1 This is a plan view of one layer of the maze. In the figure, "source" refers to the position directly below the scanning box, that is, the position where the electron beam is extracted.

[0008] Figure 2 This is a plan view of the second floor of the maze. In this figure, "source" refers to the position of the acceleration tube, which is located directly above the scanning box.

[0009] The structure of a typical single-layer maze is gourd-shaped, usually with multiple turns, so that the rays need to be scattered multiple times before they can escape from the shielding body. The energy of the rays will decrease each time they are scattered. Therefore, if the maze structure is designed reasonably, most of the scattered rays will have a greater probability of being consumed within the shielding body.

[0010] However, the volume of the entire shield body of such a typical design is relatively large. For a 10MeV electron beam, the overall length, width and height of the shield body are generally about 22 meters * 13 meters * 9 meters, and the thickest part of the wall is about 3 meters. The construction material cost is high and the construction period is long. It also needs to be equipped with correspondingly designed transmission lines, multiple straight sections and turning sections, and the large variety of equipment parts also makes equipment maintenance more difficult.

[0011] In summary, the radiation shielding device in the prior art has the defects of a large shielding body, high construction material cost, long construction period, and a large variety of equipment parts, which brings greater difficulties to equipment maintenance. Utility Model Content

[0012] The technical problem to be solved by the utility model is to overcome the defects of the radiation shielding device in the prior art, such as the large volume of the entire shielding body, the high cost of construction materials, the long construction period, and the greater difficulty in equipment maintenance caused by the large variety of equipment parts, and to provide a linear channel type transportation channel to achieve the purpose of miniaturization and compactness in design, reduce the floor space, and shorten the construction period of the radiation shielding device and linear accelerator system.

[0013] The utility model solves the above technical problems through the following technical solutions:

[0014] A radiation shielding device for a linear accelerator system, the linear accelerator system includes a linear accelerator and a transmission line, the transmission line includes a plurality of transmission sections, and is characterized in that shielding walls are provided on both sides of the transmission line. The radiation shielding device includes a control unit, an upper shielding body, a lower shielding body and a plurality of shielding components.

[0015] The upper shielding body is arranged above the transmission line, and a transmission space is arranged between the upper shielding body and the transmission line;

[0016] The lower shielding body is arranged below the transmission line;

[0017] The shielding assembly and the transmission line are arranged on a straight line passing through the scanning box of the linear accelerator, each shielding assembly includes two shielding plates connected to each other and a lifting motor, and the shielding plates divide the transmission space into a plurality of shielding rooms;

[0018] The control unit sends a control signal to the lifting motor, and the lifting motor drives the connected shielding plates to rise and fall.

[0019] Preferably, a receiving groove for the shielding plate is provided on the upper shielding body, a connecting piece through hole is provided on the top of the receiving groove, and the connecting piece between the two shielding plates is installed through the connecting piece through hole.

[0020] Preferably, each conveying section includes a support, a conveying roller and a conveying motor, the control unit sends a control signal to the conveying motor, the conveying motor drives the conveying roller to rotate, and a shielding plate accommodating gap matching the position of the accommodating slot is provided between two adjacent conveying sections.

[0021] Preferably, the lower shielding body comprises a plurality of shielding blocks, and the shielding blocks are arranged in the supporting member.

[0022] Preferably, the length of the shielding plate is greater than the length from the lower surface of the upper shielding body to the lower surface of the lower shielding body, and a groove matching the position of the shielding plate accommodating gap is provided below the support member.

[0023] Preferably, two pulleys are arranged between two shielding plates in the same shielding assembly, each shielding assembly corresponds to a lifting motor, and each lifting motor is connected to a pulley.

[0024] Preferably, each conveying section is provided with a cargo detection device, and the cargo detection device comprises a photoelectric sensor.

[0025] Preferably, the linear accelerator system includes a first-floor building and a second-floor building, the second-floor building includes the main body of the linear accelerator, a control room, a water cooling room and a modulator room, the control unit is arranged in the control room, and the first-floor building includes the scanning box, the transmission line and the shielding wall.

[0026] Preferably, an inspection passage is provided between the transmission line and a shielding wall.

[0027] The utility model also provides a linear accelerator system, which is characterized in that the linear accelerator system comprises the radiation shielding device for the linear accelerator system as described above.

[0028] On the basis of conforming to the common sense in the art, the above-mentioned preferred conditions can be arbitrarily combined to obtain the preferred embodiments of the present utility model.

[0029] The positive and progressive effects of the utility model are:

[0030] The utility model proposes a linear channel irradiation shielding room structure, in which lead and concrete are used to make a linear shielding channel, a straight section transmission line is provided, lead lifting doors are designed between a plurality of linear sections, and only one door is opened at a time on a single side, so that scattered rays are blocked and absorbed by a plurality of lead doors at any time, thereby forming multiple shielding physically.

[0031] Making the shielding body into a straight channel will greatly simplify the complexity and construction difficulty of the shielding body; selecting only straight transmission lines will also simplify the manufacturing, installation and maintenance of the transmission lines; replacing the concrete turning structure with lead doors can maximize the radiation absorption capacity in a limited space, saving floor space and construction period.

[0032] In the specific design, the lead doors will be designed to be linked with each other, so that there are enough lead doors to block the escape of rays at any time.

[0033] Structural scheme of shielding room: linear channel type; the linear channel design achieves the purpose of miniaturization and compactness; reduces the floor space and shortens the construction period.

[0034] The lead lift door linkage ensures that at most one lift door is open at any time (the number of lift doors opened can be adjusted according to the thickness of the shielding plate); while achieving the movement of goods, the purpose of minimizing the escape of scattered rays is achieved, so as to ensure compliance with the national radiation protection safety requirements.

[0035] Each lift door has fixed side tracks for rising and falling to ensure smooth operation of the lift door. In addition to the passage for cargo to move forward, other spaces are designed with shielding blocks to block scattered rays.

[0036] Every two lead doors are connected by stainless steel cables, which is similar to the driving method of elevator counterweights. This physical connection method has high reliability, is not affected by radiation, and requires lower power to drive. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 It is a schematic diagram of the structure of a linear accelerator system in the prior art.

[0038] Figure 2 FIG. 4 is another structural schematic diagram of a linear accelerator system in the prior art.

[0039] Figure 3 This is a schematic structural diagram of a linear accelerator system according to Example 1 of the utility model.

[0040] Figure 4 This is another structural schematic diagram of the linear accelerator system of Example 1 of the utility model.

[0041] Figure 5 This is a schematic diagram of the structure of the conveying section of Example 1 of the utility model.

[0042] Figure 6 This is a schematic structural diagram of a linear accelerator system according to Example 1 of the utility model. DETAILED DESCRIPTION

[0043] The present invention is further described below by way of embodiments, but the present invention is not limited to the scope of the embodiments.

[0044] Example 1

[0045] In this embodiment, the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0046] See also Figures 3 to 6 , this embodiment provides an industrial linear accelerator system.

[0047] The linear accelerator system includes a radiation shielding device 100 , a linear accelerator 101 , and a transmission line 102 . The transmission line includes a plurality of transmission sections 103 .

[0048] The conveyor line can be a crawler conveyor or a roller conveyor. In this embodiment, each conveying section 103 corresponds to a roller conveyor. The roller conveyor includes a support member 1031 , a conveying roller 1032 and a conveying motor 1033 .

[0049] Shielding walls are provided on both sides of the transmission line. The radiation shielding device 100 includes a control unit, an upper shielding body 1001, a lower shielding body 1002 and a plurality of shielding components.

[0050] In this embodiment, the control unit is integrated into the control end of the linear accelerator system. The control end may be a processing chip with computing power, or a processing terminal such as a host computer, or a server, etc.

[0051] The upper shielding body 1001 is arranged above the conveying line, and a conveying space is arranged between the upper shielding body 1001 and the conveying line. Goods and materials are conveyed in the conveying space through conveying rollers.

[0052] The lower shielding body 1002 is disposed below the transmission line.

[0053] The shielding assembly and the transmission line are arranged on a straight line passing through the scanning box 1011 of the linear accelerator.

[0054] The transmission directions of the transmission lines are located on the same straight line, and the straight line passes through the location of the scanning box. In this embodiment, the shielding plate is perpendicular to the straight line.

[0055] Each shielding assembly includes two shielding plates 1003 connected to each other and a lifting motor 1004. The shielding plates divide the conveying space into a number of shielding chambers.

[0056] A conveying section, ie, a roller conveying device, is provided between any two adjacent shielding plates.

[0057] The control unit sends a control signal to the lifting motor 1004, and the lifting motor 1004 drives the connected shielding plates to rise and fall.

[0058] One side of the scanning box of this embodiment includes three shielding components (two sides include six shielding components in total), each shielding component includes two shielding plates, a total of six shielding plates, and the shielding plates are lead lifting doors. According to the thickness of the lead door, the number of shielding plates can be adaptively adjusted. If the shielding plate is thicker, four shielding plates can be used to ensure that other shielding plates block radiation when the shielding plate is lifted.

[0059] The lead lift door linkage ensures that at most one lift door is open at any time (the number of lift doors opened can be adjusted according to the thickness of the shielding plate); while achieving the movement of goods, the purpose of minimizing the escape of scattered rays is achieved, so as to ensure compliance with the national radiation protection safety requirements.

[0060] In this embodiment, one side of the scanning box includes six conveying sections (two sides include twelve conveying sections in total), and there are 7 conveying rollers in total including the conveying roller under the scanning box, and 6 shielding plates are interspersed between the 7 conveying rollers.

[0061] The two connected shielding plates are connected by stainless steel cables, similar to the drive method of elevator counterweights. This physical connection method has high reliability and is not affected by radiation. The power required for the drive is also low.

[0062] Equipped with straight transmission lines, lead lifting doors are designed between multiple straight segments, and only one door is opened on one side at a time, so that the scattered rays are blocked and absorbed by multiple lead doors at any time, forming multiple shielding physically.

[0063] Making the shielding body into a straight channel will greatly simplify the complexity and construction difficulty of the shielding body; selecting only straight transmission lines will also simplify the manufacturing, installation and maintenance of the transmission lines; replacing the concrete turning structure with lead doors can maximize the radiation absorption capacity in a limited space, saving floor space and construction period.

[0064] Straight channel type: the straight channel design achieves the purpose of miniaturization and compactness; reduces the floor space and shortens the construction period.

[0065] The upper shielding body is provided with a receiving groove 1006 for the shielding plate, and a connecting member through-hole is provided at the top of the receiving groove, and the connecting member between the two shielding plates is installed through the connecting member through-hole.

[0066] Each conveying section 103 includes a supporting member 1031 , a conveying roller 1032 and a conveying motor 1033 .

[0067] The control unit sends a control signal to the conveying motor, and the conveying motor drives the conveying roller to rotate. A shielding plate accommodating gap 1007 matching the position of the accommodating slot is provided between two adjacent conveying sections.

[0068] The lower shielding body includes a plurality of shielding blocks, and the shielding blocks are arranged in the supporting member.

[0069] The length of the shielding plate is greater than the length from the lower surface of the upper shielding body to the lower surface of the lower shielding body, and a groove matching the position of the shielding plate accommodating gap is provided below the support member.

[0070] Two pulleys 1005 are arranged between two shielding plates in the same shielding assembly. Each shielding assembly corresponds to a lifting motor, and each lifting motor is connected to a pulley.

[0071] Each conveying section 103 is provided with a cargo detection device, and the cargo detection device includes a photoelectric sensor 1034 .

[0072] The linear accelerator system includes a first-floor building and a second-floor building.

[0073] The two-story building includes a main body of the linear accelerator, a control room, a water-cooling room and a modulator room, the control unit is arranged in the control room, and the one-story building includes the scanning box, the transmission line and the shielding wall.

[0074] An inspection passage is provided between the transmission line and a shielding wall.

[0075] See also Figure 6 , the working process of the radiation shielding device is:

[0076] 1. A single lift door opens and the goods leave the middle section;

[0077] 2. The two lift doors are closed, and the middle section is free;

[0078] 3. A single lift door opens and the goods enter the middle section.

[0079] The shielding room is designed as a straight channel shape, with multiple straight sections of conveyor lines, and lead lift doors are set between each section of the conveyor line. Every two lead lift doors are linked, and at most only one door can be opened at any time. Each section of the conveyor line is equipped with a photoelectric sensor, which can sense whether there is cargo on this section of the conveyor line. If there is no cargo, the conveyor line will start when the door is opened, and the cargo will be sent to this section of the conveyor line. Only one lift door can be opened on one side at the same time, so as to ensure that there is enough lead shielding on the straight channel path to prevent the escape of scattered rays.

[0080] Although the specific embodiments of the present invention are described above, those skilled in the art should understand that these are only examples, and the protection scope of the present invention is defined by the appended claims. Those skilled in the art may make various changes or modifications to these embodiments without departing from the principle and essence of the present invention, but these changes and modifications fall within the protection scope of the present invention.

Claims

1. A radiation shielding device for a linear accelerator system, the linear accelerator system comprising a linear accelerator and a transmission line, the transmission line comprising a plurality of transmission sections, characterized in that: Shielding walls are provided on both sides of the transmission line. The radiation shielding device includes a control unit, an upper shielding body, a lower shielding body and a plurality of shielding components. The upper shielding body is arranged above the transmission line, and a transmission space is arranged between the upper shielding body and the transmission line; The lower shielding body is arranged below the transmission line; The shielding assembly and the transmission line are arranged on a straight line passing through the scanning box of the linear accelerator, each shielding assembly includes two shielding plates connected to each other and a lifting motor, and the shielding plates divide the transmission space into a plurality of shielding rooms; The control unit sends a control signal to the lifting motor, and the lifting motor drives the connected shielding plates to rise and fall.

2. The radiation shielding device for a linear accelerator system according to claim 1, characterized in that: The upper shielding body is provided with a receiving groove for the shielding plate, the top of the receiving groove is provided with a connecting piece through hole, and the connecting piece between the two shielding plates is installed through the connecting piece through hole.

3. The radiation shielding device for a linear accelerator system according to claim 2, characterized in that: Each conveying section includes a support, a conveying roller and a conveying motor. The control unit sends a control signal to the conveying motor, and the conveying motor drives the conveying roller to rotate. A shielding plate accommodating gap matching the accommodating slot position is provided between two adjacent conveying sections.

4. The radiation shielding device for a linear accelerator system according to claim 3, characterized in that: The lower shielding body includes a plurality of shielding blocks, and the shielding blocks are arranged in the supporting member.

5. The radiation shielding device for a linear accelerator system according to claim 3, characterized in that: The length of the shielding plate is greater than the length from the lower surface of the upper shielding body to the lower surface of the lower shielding body, and a groove matching the position of the shielding plate accommodating gap is provided below the support member.

6. The radiation shielding device for a linear accelerator system according to claim 1, characterized in that: Two pulleys are arranged between two shielding plates in the same shielding assembly. Each shielding assembly corresponds to a lifting motor, and each lifting motor is connected to a pulley.

7. The radiation shielding device for a linear accelerator system according to claim 1, characterized in that: Each conveying section is provided with a cargo detection device, and the cargo detection device comprises a photoelectric sensor.

8. The radiation shielding device for a linear accelerator system according to claim 1, characterized in that: The linear accelerator system includes a first-floor building and a second-floor building. The second-floor building includes a main body of the linear accelerator, a control room, a water cooling room and a modulator room. The control unit is arranged in the control room. The first-floor building includes the scanning box, the transmission line and the shielding wall.

9. The radiation shielding device for a linear accelerator system according to claim 1, characterized in that: An inspection passage is provided between the transmission line and a shielding wall.

10. A linear accelerator system, characterized in that: The linear accelerator system comprises the radiation shielding device for a linear accelerator system according to any one of claims 1 to 9.

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