Shielded room for accelerator, construction method of shielded room and accelerator testing method

Abstract

The invention relates to a shielding room for an accelerator, a construction method of the shielding room and an accelerator testing method. The shielding room comprises a top wall, a circumferential wall body and a side door. The circumferential wall body and the top wall enclose an inner space, the circumferential wall body is constructed to be provided with a lateral opening, and the lateral opening is communicated with the inner space so that the accelerator can enter the inner space from the lateral opening. The side door is provided with a side door body, the side door body is used for blocking the lateral opening of the circumferential wall and can move in the first direction, and the first direction is perpendicular to the plane where the lateral opening is located.

Description

Technical Field

[0001] This invention relates to the field of shielding and protection technology, and in particular to a shielding chamber for testing the shielding performance of accelerators. Background Technology

[0002] Accelerators are crucial particle acceleration devices widely used in particle physics, medicine, materials science, and other fields. Accelerators accelerate charged particles to high energies for various experiments, research, and applications. In medicine, accelerators are used for radiotherapy and radiodiagnosis. For example, in cancer treatment, accelerators can accelerate charged particles to high energies and direct these high-energy particles onto cancer cells, killing them without damaging surrounding healthy tissue. However, both during production testing and actual use, accelerators generate significant amounts of radiation, including gamma rays, X-rays, and neutrons. This radiation poses a serious threat to the environment and human health around the accelerator. Therefore, to ensure the safety of personnel and the environment, a separate radiation test is required before the accelerator is officially installed in the work environment. After passing the test, a Radiation Safety License (RSL) is obtained. Radiation testing must be conducted in a dedicated shielded room to minimize the impact of radiation on the surrounding environment and personnel. After obtaining the RSL, the accelerator is removed from the shielded room and installed in the actual work environment.

[0003] Existing accelerator shielding methods mainly include: accelerator self-shielding and the construction of shielded rooms to house the accelerator. These shielded rooms (sometimes called shielded chambers or machine rooms) typically use concrete as the shielding material and are constructed on-site. However, current shielded rooms and their construction processes have the following problems.

[0004] First, to achieve better shielding, existing shielded rooms, after constructing the outer walls, use large cranes to hoist the accelerator into the room from above, and then construct the top wall to ensure sufficient enclosure and prevent radiation leakage. However, this construction method, requiring large cranes, not only increases the cost and difficulty of building the shielded room but also imposes greater restrictions on the site, requiring at least sufficient space for hoisting. Furthermore, the hoisting process requires using the top of the outer walls as support, which can damage the outer walls and reduce the radiation protection effectiveness of the shielded room.

[0005] Secondly, existing shielded room construction methods typically employ on-site construction, requiring a large number of workers to carry out the work. This on-site construction method not only has a long construction period but also high construction costs. Furthermore, the long construction period of existing shielded rooms and the traditional construction methods also significantly extend the time required to obtain the RSL (Resource Level Sequence).

[0006] Third, existing shielded rooms typically generate a large amount of radioactive waste after being abandoned, including all the foundation, all the exterior walls, and all the roof sections of the shielded room. This poses significant challenges to the difficulty and cost of handling radioactive waste.

[0007] Therefore, it is desirable to improve the existing shielded rooms to overcome at least one of the aforementioned drawbacks. Summary of the Invention

[0008] The technical solution proposed in this invention aims to solve one or more of the aforementioned problems of shielding rooms used for shielding and protecting accelerators in the prior art.

[0009] In a first aspect of the invention, a shielded chamber for an accelerator is provided, the shielded chamber comprising: a top wall; a circumferential wall that, together with the top wall, encloses an interior space, the circumferential wall being configured to have a lateral opening communicating with the interior space for the accelerator to enter the interior space through the lateral opening; and a side door having a side door body for blocking the lateral opening of the circumferential wall and movable in a first direction perpendicular to the plane containing the lateral opening.

[0010] In at least one embodiment of the first aspect of the invention, the side door further includes a compressed air drive device for driving the side door body to move.

[0011] In at least one embodiment of the first aspect of the invention, the compressed air drive device includes: one or more air cushions located on the bottom surface of the side door body, wherein each of the one or more air cushions is inflatable to support the side door body; and a drive for driving the side door body supported by the one or more air cushions to move.

[0012] In at least one embodiment of the first aspect of the present invention, the one or more air cushions include a plurality of air cushions symmetrically distributed on the bottom surface of the side door body.

[0013] In at least one embodiment of the first aspect of the present invention, the side door body includes an inner portion and an outer portion. When the side door body blocks the lateral opening of the circumferential wall, the inner portion is located inside the lateral opening, and the outer portion is located outside the lateral opening. The inner portion has an inner height, the outer portion has an outer height, the height of the lateral opening is greater than the inner height and less than the outer height, and the bottom surface of the outer portion is flush with the bottom surface of the inner portion, and the top surface of the outer portion extends beyond the top surface of the inner portion.

[0014] In at least one embodiment of the first aspect of the invention, the interior portion of the side door body further includes a first interior portion and a second interior portion. When the side door body blocks the lateral opening of the circumferential wall, the first interior portion is closer to the interior space for placing the accelerator than the second interior portion. The first interior portion has a first interior height, and the second interior portion has a second interior height. The first interior height is less than the second interior height. The lateral opening includes a first opening portion and a second opening portion. The first opening portion is closer to the interior space for placing the accelerator than the second opening portion. The first opening portion is used to accommodate the first interior portion of the side door body, and the second opening portion is used to accommodate the second interior portion of the side door body.

[0015] In at least one embodiment of the first aspect of the invention, the inner portion of the side door body has an inner width, the outer portion has an outer width, the width of the lateral opening is greater than or equal to the inner width and less than the outer width, wherein each of two opposing sides of the outer portion in the width direction extends beyond the corresponding side of the inner portion.

[0016] In at least one embodiment of the first aspect of the invention, the outer portion has a varied outer width that gradually increases along a direction away from the lateral opening.

[0017] In at least one embodiment of the first aspect of the invention, the inner portion further includes a reinforcing shield embedded in at least a portion of the inner portion and extending toward the innermost side of the side door body, the bottom surface of the reinforcing shield being flush with the bottom surface of the outer portion, and the reinforcing shield being formed of a material having a stronger radiation blocking capability than other components of the side door body.

[0018] In at least one embodiment of the first aspect of the invention, the floor of the interior space is formed with a step portion for opposing the reinforced shielding portion, the height and position of the step portion being designed such that when the side door body is moved to the lateral opening by the compressed air drive device, the top surface of the step portion is higher than the bottom surface of the side door body.

[0019] In at least one embodiment of the first aspect of the invention, the shielding room further includes a directional guide rail located near the lateral opening of the circumferential wall and extending along the first direction for guiding the side door body to move in the first direction.

[0020] In at least one embodiment of the first aspect of the present invention, at least one of the top wall, the circumferential wall and the side door body is formed by splicing together a plurality of prefabricated components.

[0021] In at least one embodiment of the first aspect of the invention, each prefabricated component has at least one stepped side, the stepped side being adapted to be spliced ​​with stepped sides of other prefabricated components.

[0022] In at least one embodiment of the first aspect of the invention, two adjacent prefabricated components being spliced ​​are connected by bolts.

[0023] In at least one embodiment of the first aspect of the invention, at least one of the top wall, the circumferential wall and the side door body comprises multiple layers, the multiple layers comprising an inner layer and an outer layer, the inner layer being close to the internal space for placing the accelerator, the outer layer being away from the internal space for placing the accelerator, and the inner layer or the outer layer being removable separately.

[0024] In at least one embodiment of the first aspect of the invention, each layer of at least one of the top wall, the circumferential wall and the side door body is assembled from one or more prefabricated components, each prefabricated component having at least one stepped side for fitting and splicing with stepped sides of other prefabricated components.

[0025] In at least one embodiment of the first aspect of the invention, each layer has one or more seams located between two adjacent prefabricated members being spliced, wherein the seams on each layer of the multilayer are staggered from the seams on adjacent layers.

[0026] In a second aspect of the invention, an accelerator testing method is provided, the method comprising: providing a shielded chamber as described in any of the preceding paragraphs; moving a side door body away from a lateral opening in the circumferential wall; transporting the accelerator through the lateral opening into or out of the internal space enclosed by the circumferential wall and the top wall; and moving the side door body closer to and blocking the lateral opening.

[0027] In at least one embodiment of the second aspect of the invention, transporting the accelerator through the lateral opening into or out of the internal space enclosed by the circumferential walls and the top wall comprises: using an automated guided vehicle as a carrier for the accelerator to transport the accelerator through the lateral opening into or out of the internal space enclosed by the circumferential walls and the top wall.

[0028] In a third aspect of the invention, a construction method is provided, characterized in that the construction method is used to construct a shielded room as described in any of the preceding paragraphs. Attached Figure Description

[0029] To further illustrate the above and other advantages and features of the various embodiments of the present invention, a more specific description of the various embodiments of the present invention will be presented with reference to the accompanying drawings. It should be understood that these drawings depict only typical embodiments of the present invention and are therefore not intended to limit the scope of protection claimed by the present invention.

[0030] Figure 1 A schematic diagram of a shielded room with the side door not installed according to an embodiment of the present invention is shown.

[0031] Figure 2 A schematic diagram of the side door structure as viewed from a first angle is shown according to an embodiment of the present invention.

[0032] Figure 3 A schematic diagram of the side door structure as viewed from a second angle according to an embodiment of the present invention is shown.

[0033] Figure 4 A schematic diagram of the side door structure as viewed from a third angle according to an embodiment of the present invention is shown.

[0034] Figure 5 A schematic diagram of the shielded room with the side door installed according to an embodiment of the present invention is shown.

[0035] Figure 6 A schematic diagram of the structure of a prefabricated component according to an embodiment of the present invention is shown.

[0036] Figure 7 A flowchart of a method for constructing a shielded room according to an embodiment of the present invention is shown.

[0037] Figure 8 A schematic diagram of the foundation of the shielding room according to an embodiment of the present invention is shown.

[0038] Figure 9 A schematic diagram of the circumferential walls of a shielding room according to an embodiment of the present invention is shown.

[0039] Figure 10 A schematic diagram of the circumferential walls and top wall of a shielding room according to an embodiment of the present invention is shown.

[0040] Figure 11 A flowchart of an accelerator testing method according to an embodiment of the present invention is shown. Detailed Implementation

[0041] The present invention will be further described below with reference to specific embodiments and accompanying drawings. More details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention can obviously be implemented in many other ways different from those described herein. Those skilled in the art can make similar extensions and derivations based on actual application situations without departing from the spirit of the present invention. Therefore, the scope of protection of the present invention should not be limited by the content of this specific embodiment.

[0042] This application uses specific terms to describe embodiments of the application. Terms such as "one embodiment," "other embodiments," and / or "some embodiments" refer to a particular feature, structure, or characteristic associated with at least one embodiment of the application. Therefore, it should be emphasized and noted that "one embodiment," "other embodiments," or "some embodiments" mentioned twice or more in different locations in this specification do not necessarily refer to the same embodiment. Furthermore, certain features, structures, or characteristics in one or more embodiments of the application can be appropriately combined.

[0043] It should be noted that, in order to simplify the description of the present application and thus aid in the understanding of one or more embodiments, the description of the embodiments of the present application may sometimes combine multiple features into a single embodiment, drawing, or description thereof. However, this disclosure method does not imply that the subject matter of the application requires more features than those mentioned in the claims.

[0044] In the description of this disclosure, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," and "horizontal," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are used only for the convenience of describing this disclosure and for simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this disclosure. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. In the description of this disclosure, it should be noted that unless otherwise expressly specified and limited, the terms "installed," "connected," "coupled," and "coupled" should be interpreted broadly. For example, they can refer to fixed connections or detachable connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art can understand the specific meaning of the above terms in this disclosure according to the specific circumstances.

[0045] In this paper, the terms “inner” and “outer” are used to indicate the degree of proximity to the interior space of the shielded room, where “inner” is closer to the interior space of the shielded room than “outer”.

[0046] Figure 1 A schematic diagram of a shielding chamber 100 with the side door 1 not installed according to an embodiment of the present invention is shown. The shielding chamber 100 can be applied to accelerators ( Figure 1 (Not shown) is installed or placed within it for radiation testing of the accelerator. The shielded room 100 prevents the radiation generated by the accelerator from affecting the surrounding environment and personnel during radiation testing. As an example, the accelerator may include a cyclotron, a linear accelerator, etc.

[0047] like Figure 1 As shown, the shielded room 100 may include circumferential walls 3 and a top wall 4. Additionally, the shielded room may also include a foundation 2. Figure 1 Not shown in the image, see [link / reference]. Figure 8 For clarity, in Figure 1 The diagram illustrates a Cartesian coordinate system. The circumferential wall 3 can be positioned approximately vertically along the Z-axis between the foundation 2 and the top wall 4, with the foundation 2 and top wall 4 approximately parallel to the XY plane. The circumferential wall 3 and top wall 4 together enclose an internal space 233. Figure 1 Not shown in the image, see [link / reference]. Figure 8 and Figure 9The internal space is for mounting or placing an accelerator. The circumferential wall 3 may include a wall generally aligned along the XZ plane (e.g., left wall 31) and a wall generally aligned along the YZ plane (e.g., front wall 32). The front wall 32 may have a lateral opening 321 that extends along the thickness direction of the front wall 32 (e.g., along the X-axis) and communicates with the internal space 233 of the shielded chamber 100. The accelerator can enter and exit the internal space 233 of the shielded chamber 100 via the lateral opening 321.

[0048] See Figure 1 The shielded room 100 may also include a side door 1, which may include a side door body 11. The side door body 11 may be configured to block the lateral opening 321 of the front wall 32. The side door 1 may also include a compressed air drive device 12, which may be used to drive the side door body 11 to move, for example, to drive the side door body 11 to move in a direction perpendicular to the plane containing the lateral opening 321 (i.e., the YZ plane). In other words, the compressed air drive device 12 may be used to drive the side door body 11 to move in the X-axis direction.

[0049] The shielded room 100 may also include a directional guide rail (not shown in the figure), which may be located on the ground near the lateral opening 321 of the front wall 32 and along... Figure 1 The side door body 11 extends along the X-axis to guide its movement in that direction. The bottom of the side door body 11 may have a mounting portion adapted to fit a directional guide rail. When the side door body 11 is mounted onto the directional guide rail via its mounting portion, the direction of movement of the side door body 11 can be guided by the directional guide rail. Figure 1 The direction shown is along the X-axis (i.e., the direction perpendicular to the plane containing the lateral opening 321). In some embodiments, the shielded room 100 may include two directional guide rails, which may be symmetrically located on the ground on both sides of the lateral opening 321 and extend along the X-axis. The bottom of the side door body 11 may have two mounting portions for fitting and mounting to the two directional guide rails respectively.

[0050] By moving the side door body 11 away from the side opening 321 in the negative X-axis direction, the side opening 321 of the front wall 32 can be opened to facilitate the transport of accelerators into or out of the shielded chamber 100. This design of the side opening 321 of the shielded chamber 100 avoids the need for large crane equipment, thereby reducing the construction cost and difficulty of the shielded chamber 100. Furthermore, since the accelerators can be easily transported into or out of the shielded chamber 100, it is possible to perform test operations on multiple accelerators within the shielded chamber 100. In this invention, the direction of movement (X-axis direction) of the side door 1 can be perpendicular to the plane where the side opening 321 is located, and the side door body 11 can have sufficient thickness, for example, a thickness comparable to that of the front wall 32. By moving the side door body 11, which has sufficient thickness, toward the positive X-axis into the side opening 321, the side opening 321 of the front wall 32 can be well sealed by the side door body 11, which has sufficient thickness, thereby ensuring that the shielding chamber 100 has a good shielding effect. The dimensions (e.g., height, width, thickness) of the side door body 11 can be adapted to the dimensions of the side opening 321, and the surface shape of the side door body 11 can match the wall of the side opening 321 (e.g., formed on the front wall 32 and the top wall 4), so that the side door body 11 can seal the side opening 321 and prevent radiation leakage during the test.

[0051] The following is for reference Figures 2-4 Describe side door 1. Figure 2 A schematic diagram of the side door 1 as viewed from a first angle is shown according to an embodiment of the present invention. Figure 3 A schematic diagram of the side door 1 as viewed from a second angle according to an embodiment of the present invention is shown. Figure 4 A schematic diagram of the side door 1 as viewed from a third angle according to an embodiment of the present invention is shown.

[0052] like Figure 2 and Figure 4 As shown, the compressed air drive unit 12 may include a driver 121, which may be located on the outside of the side door body 11. Figure 4As shown, the compressed air drive unit 12 may further include four air cushions 123, which may be symmetrically distributed on the bottom surface of the side door body 11. Each of these air cushions 123 may be injected with compressed air via a high-pressure pump (not shown). The high-pressure pump may be located outside the side door body 11 and may be detachably connected to one end of an air duct (not shown), the other end of which may be connected to a compressor, which may be located outside the shielded chamber 100, for supplying compressed air. The inflated air cushions 123 may lift the side door body 11, causing the side door body 11 to leave the ground. When the side door body 11 is lifted by the inflated air cushions 123, the drive unit 121 may drive the side door body 11 to move. As an example, the drive unit 121 may be a compressed air drive motor, which can convert the pressure energy of compressed air into mechanical kinetic energy to drive the side door body 11 to move.

[0053] It should be understood that Figure 4 The number of air cushions 123 shown (i.e., four) is merely illustrative and not limiting. In another embodiment, the compressed air drive 12 may include only one air cushion, which may be located on the bottom surface of the side door body 11. In yet another embodiment, the compressed air drive 12 may include other numbers of air cushions, such as two, three, five or more, which may be symmetrically distributed on the bottom surface of the side door body 11.

[0054] In some embodiments, the side door body 11 may be constructed of concrete. Due to shielding requirements, a significant thickness of the side door body may also be required, resulting in a very heavy weight, for example, up to 60 tons. To enable repeated and rapid movement of the extremely heavy side door body 11, the present invention utilizes a compressed air drive device 12 comprising an actuator 121 and an air cushion 123 on the side door 1. The inflated air cushion 123 lifts the side door body 11 off the ground, thereby greatly reducing the friction between the side door body 11 and its contact surface. This reduces the power required for the actuator 121 to move the side door body 11, thus facilitating the rapid opening and closing of the side door body 11 through the lateral opening 321 of the shielding chamber 100.

[0055] See also Figures 2-4The side door body 11 may include an inner portion 111 and an outer portion 113. When the side door body 11 blocks the lateral opening 321 of the front wall 32 (i.e., the side door body 11 is installed in place at the lateral opening 321), the inner portion 111 may be located inside the lateral opening 321, and the outer portion 113 may be located outside the lateral opening 321. The bottom surface of the outer portion 113 may be flush with the bottom surface of the inner portion 111, so that when the side door body 11 is installed in place at the lateral opening 321, both the bottom surfaces of the inner portion 111 and the bottom surfaces of the outer portion 113 of the side door body 11 may be in contact with the ground or foundation 2. The top surface of the outer portion 113 of the side door body 11 may extend beyond the top surface of the inner portion 111, so that when the side door body 11 is installed in place at the lateral opening 321, the outer portion 113 of the side door body 11 may seal the gap between the inner portion 111 of the side door body 11 and the lateral opening 321 above the outside of the lateral opening 321, thereby preventing radiation generated during accelerator operation from leaking out of the gap.

[0056] In some embodiments, such as Figures 2-4 As shown, the side door body 11 may further include a reinforcing shield 110, which can be embedded in at least a portion of the inner portion 111 and extends toward the innermost side of the side door body 11. Figures 2-4 As shown, the bottom surface of the reinforced shielding portion 110 may be flush with the bottom surface of the outer portion 113. The reinforced shielding portion 110 may be formed of a material with stronger radiation blocking capabilities than other components of the side door body 11. For example, the reinforced shielding portion 110 may include at least one of boron-containing polyethylene and lead materials, while other components of the side door body 11 may include concrete. Compared to concrete, boron-containing polyethylene or lead materials can more effectively absorb radiation and prevent radiation leakage due to refraction. In some embodiments, such as Figure 4 As shown, the first set of air cushions 123 in the compressed air drive device 12 may be located on the bottom surface of the reinforced shielding part 110, and the second set of air cushions 123 may be located on the bottom surface of other components of the side door body 11 other than the reinforced shielding part 110.

[0057] In some embodiments, a step portion 234 may be formed on the floor at the interior space 233 of the shielded room 100. Figure 1 Not shown in the image, see [link / reference]. Figure 9The step portion 234 may be formed because the ground height at the internal space 233 is greater than the ground height at the side opening 321. During or after the side door body 11 is installed into the side opening 321, the step portion 234 may be opposite the reinforcing shield portion 110 of the side door body 11. The height and position of the step portion 234 may be designed such that when the side door body 11 is moved to the side opening 321 by the compressed air drive device 12, the top surface of the step portion 234 is higher than the bottom surface of the side door body 11. During the process of moving the side door body 11 to the side opening 321 by the compressed air drive device 12, the bottom surface of the side door body 11 is lifted by the air cushion 123, so that the bottom surface of the side door body 11 is at a certain height from the ground. At this time, the top surface of the step portion 234 may still be higher than the bottom surface of the side door body 11, thereby preventing radiation from leaking out from the bottom surface of the side door body 11 at a certain height from the ground. Furthermore, when the side door body 11 is installed in place at the side opening 321 and the side door body 11 is no longer supported by the air cushion 123, the top surface of the step portion 234 is also higher than the bottom surface of the side door body 11. At this time, even if there is a gap between the bottom surface of the installed side door body 11 and the ground (for example, due to the unevenness of the bottom surface of the side door body 11 and / or the ground), the higher step portion 234 can also prevent the radiation generated during the operation of the accelerator from leaking out from the gap.

[0058] See back Figure 1The lateral opening 321 may have a height H1 measured along the Z-axis, the inner portion 111 of the side door body 11 may have an inner height H2 measured along the Z-axis, and the outer portion 113 of the side door body 11 may have an outer height H3 measured along the Z-axis. The height H1 of the lateral opening 321 may be greater than the inner height H2 of the inner portion 111 of the side door body and less than the outer height H3 of the outer portion 113 of the side door body, so that when the side door body 11 blocks the lateral opening 321 of the front wall 32, the inner portion 111 may be located inside the lateral opening 321, while the outer portion 113 may be located outside the lateral opening 321. In some embodiments, the air cushion 123 disposed on the bottom surface of the side door body 11 may have a height difference ΔH before and after inflation. The height difference obtained by subtracting the inner height H2 of the inner part 111 of the side door body from the height H1 of the lateral opening 321 may be greater than or equal to the height difference ΔH before and after inflation of the air cushion, so as to allow the inner part 111 of the side door body 11 supported by the inflated air cushion 123 to smoothly enter the lateral opening 321. The height difference obtained by subtracting the height H1 of the lateral opening 321 from the outer height H3 of the outer part 113 of the side door body may be greater than or equal to the height difference ΔH before and after inflation of the air cushion, so that when the side door body 11 is installed in place at the lateral opening 321 and the air cushion 123 located on the bottom surface of the side door body 11 is deflated, the outer part 113 of the side door body 11 can seal the gap between the inner part 111 of the side door body 11 and the lateral opening 321 above the outside of the lateral opening 321, thereby preventing the radiation generated during the operation of the accelerator from leaking out from the gap.

[0059] In a further embodiment, such as Figure 2 and Figure 3 As shown, the internal portion 111 of the side door body 11 may further include a first internal portion 111a and a second internal portion 111b. When the side door body 11 blocks the lateral opening 321 of the front wall 32 (i.e., the side door body 11 is installed in place at the lateral opening 321), both the first internal portion 111a and the second internal portion 111b may be located within the lateral opening 321, and the first internal portion 111a may be closer to the internal space 233 for placing the accelerator than the second internal portion 111b. The first internal height of the first internal portion 111a of the side door body internal portion 111 may be less than the second internal height of the second internal portion 111b. Figure 2In the illustrated embodiment, the inner portion 111 of the side door body may have a stepped height difference from the inside to the outside. That is, the inner portion 111 of the side door body can increase abruptly from a first inner height of a first inner portion 111a to a second inner height of a second inner portion 111b, and a stepped height difference may appear at the connection between the first inner portion 111a and the second inner portion 111b. In other embodiments, the inner portion 111 of the side door body may have a linear height difference from the inside to the outside. That is, the inner portion 111 of the side door body can smoothly transition from a first inner portion to a second inner portion, and both the first and second inner portions may have varying inner heights, which gradually increase along the direction away from the lateral opening 321.

[0060] Corresponding to the first internal portion 111a and the second internal portion 111b of the side door body interior portion 111 having different heights, the lateral opening 321 may also include a first opening portion and a second opening portion of different heights. The first opening portion can be closer to the internal space 233 for placing the accelerator than the second opening portion. The first opening portion can be used to accommodate the first internal portion 111a of the side door body interior portion 111, and the second opening portion can be used to accommodate the second internal portion 111b of the side door body interior portion 111. The first opening portion and the second opening portion can be formed by a partition extending from the top of the lateral opening 321 toward the ground. The bottom surface of the second internal portion 111b of the side door body interior portion 111 can be flush with the bottom surface of the first internal portion 111a, so that when the side door body 11 is installed in place at the lateral opening 321, the bottom surfaces of both the second internal portion 111b and the first internal portion 111a of the side door body interior portion 111 can contact the ground or foundation 2. The top surface of the second inner portion 111b of the side door body interior portion 111 may exceed the top surface of the first inner portion 111a, so that when the side door body 11 is installed in place at the lateral opening 321, the second inner portion 111b of the side door body interior portion 111 can seal the gap between the first inner portion 111a of the side door body interior portion 111 and the first opening portion of the lateral opening 321 within the lateral opening 321, thereby preventing radiation generated during accelerator operation from leaking out from the gap. By designing the first inner portion 111a and the second inner portion 111b of the side door body with different heights, on the one hand, the first inner portion 111a and the second inner portion 111b are in the same thickness direction (i.e., Figure 1 The superposition in the X-axis direction allows the side door body 11 to have sufficient thickness, thereby ensuring that the shielding chamber 100 has sufficient shielding effect. On the other hand, the first internal part 111a with a lower height can reduce the weight of the side door body 11, thereby facilitating the rapid opening and closing of the side door body 11 to the lateral opening 321 of the shielding chamber 100.

[0061] See Figure 1 The lateral opening 321 may have a width W1 measured along the Y-axis direction, the inner portion 111 of the side door body 11 may have an inner width W2 measured along the Y-axis direction, and the outer portion 113 of the side door body 11 may have an outer width W3 measured along the Y-axis direction. For the sake of simplicity and clarity in the figures, W1-W3 are not labeled in the figures. The width W1 of the lateral opening 321 may be greater than or equal to the inner width W2 of the inner portion 111 of the side door body, and the width W1 of the lateral opening 321 may be less than the outer width W3 of the outer portion 113 of the side door body, so that when the side door body 11 blocks the lateral opening 321 of the front wall 32, the inner portion 111 may be located inside the lateral opening 321, while the outer portion 113 may be located outside the lateral opening 321. The outer portion 113 in the width direction (i.e., Figure 1 Each of the two opposing sides on the Y-axis direction can extend beyond the corresponding side of the inner portion 111, such that when the side door body 11 is installed in place at the lateral opening 321, the outer portion 113 of the side door body 11 can seal the gap between the inner portion 111 of the side door body 11 and the lateral opening 321 on both sides outside the lateral opening 321, thereby preventing radiation generated during accelerator operation from leaking out of the gap.

[0062] In a further embodiment, the outer portion 113 of the side door body 11 may have a varied outer width, which gradually increases in the direction away from the lateral opening 321. This gradually increasing outer width can further enhance the sealing of the side door body 11 to the lateral opening 321, thereby further improving the radiation protection effect of the shielding room 100.

[0063] Figure 5 A schematic diagram of the shielded room 100 with the side door 1 installed according to an embodiment of the present invention is shown. Figure 5 As shown, when the side door 1 is installed in place, the internal part 111 of the side door body ( Figure 5 (Not shown in the image) can be located in the lateral opening 321 ( Figure 5 (Not shown) Inside, the outer portion 113 may be located outside the lateral opening 321 and the inner side of the outer portion 113 may contact the front wall 32. Viewed from outside the shielded room 100, the outer portion 113 may completely enclose the lateral opening 321 to prevent radiation generated during accelerator operation from leaking out of the lateral opening 321.

[0064] Although the outer contour of shielded room 100 is Figure 5 The outer contour of the shielded chamber 100 is shown as an approximate cube shape; however, it should be understood that the outer contour of the shielded chamber 100 may also have other shapes, such as a hemisphere, a cylinder or other suitable polyhedral shape.

[0065] Figure 6 A schematic diagram of the structure of a prefabricated component 50 according to an embodiment of the present invention is shown. The prefabricated component 50 may be a standardized component produced in advance in batches and may be formed from concrete or other materials suitable for radiation shielding. In some embodiments, the prefabricated component 50 may be used to assemble at least one of the side door body 11, the circumferential wall 3, and the top wall 4 of the shielding room 100 described above.

[0066] See Figure 6 The prefabricated component 50 can be an approximately cuboid-shaped component with a certain thickness T, having a first stepped side 51 and a second stepped side 53. However, it should be understood that this is combined with... Figure 6 The shape of the prefabricated component 50 and the number of stepped sides on the prefabricated component 50 described are merely illustrative and not limiting. Those skilled in the art can design other shapes of prefabricated components 50 or provide other numbers of stepped sides on the prefabricated component 50 according to their actual needs.

[0067] In some embodiments, such as Figure 6 As shown, the first stepped side 51 may have bolt holes 511, and the second stepped side 53 may have bolt holes 531. Bolt holes 511 and 531 can be used to install bolts. When splicing with other prefabricated components, the stepped side of the prefabricated component 50 can be adapted to splice with the stepped side of other prefabricated components respectively. Adjacent prefabricated components 50 that are spliced ​​can be connected by bolts installed in the bolt holes of the stepped side.

[0068] Because shielded rooms require radiation protection, the sealing requirements for their components are higher than those for ordinary buildings. In this case, the present invention, by providing stepped sides on the prefabricated components 50, makes the joints between adjacent prefabricated components 50 discontinuous in the thickness direction of the prefabricated components 50. These discontinuous joints enhance the sealing of at least one of the side door body 11, the circumferential wall 3, and the top wall 4 assembled from the prefabricated components 50, thereby strengthening the radiation protection effect of the shielded room 100. Furthermore, in some embodiments of the present invention, at least one of the side door body 11, the circumferential wall 3, and the top wall 4 assembled from the prefabricated components 50 is further constructed as a multi-layered structure, wherein each layer may be assembled from one or more prefabricated components 50 and may have one or more joints (located between two adjacent prefabricated components), with the joints on each layer staggered from the joints on adjacent layers. By designing at least one component of the shielded room (e.g., the side door body 11, the circumferential wall 3, or the top wall 4) to have multiple layers and with the seams staggered on adjacent layers, the present invention can further enhance the sealing of at least one of the side door body 11, the circumferential wall 3, and the top wall 4 assembled from prefabricated components 50, thereby further enhancing the radiation protection effect of the shielded room 100.

[0069] Furthermore, in embodiments where prefabricated components 50 are used to assemble the shielded room 100, since the prefabricated components 50 can be pre-produced and assembled on-site, there is no need to manufacture the shielded room walls and ceiling on-site as in the past. This reduces labor costs and shortens the construction time of the shielded room 100, which in turn shortens the time to obtain the RSL (Real Estate List). Moreover, the prefabricated components 50 can be produced as standardized components, allowing for standardized or batch construction of the shielded room 100. Standardized construction simplifies the review and evaluation process for subsequent shielded rooms during the RSL application process after the first constructed shielded room obtains its RSL, further shortening the time to obtain the RSL.

[0070] Figure 7 A flowchart of a method 700 for constructing a shielded room 100 according to an embodiment of the present invention is shown.

[0071] At step 701, the foundation 2 of the shielded room 100 is constructed. In some embodiments, an operator (e.g., a construction worker) may create the foundation 2 on the ground used for constructing the shielded room 100, such as... Figure 8 shown. Figure 8 A schematic diagram of the foundation 2 of the shielding room 100 according to an embodiment of the present invention is shown. (As shown) Figure 8As shown, the foundation 2 may include a wall foundation 21 and an internal passage 23. The wall foundation 21 may be used to form a circumferential wall 3 thereon. The internal passage 23 may further include a channel 231 and an internal space 233 for installing or placing an accelerator. One end of the channel 231 may connect to the internal space 233, and the other end may connect to an entrance 323, through which personnel can enter and exit the internal space 233 of the shielded room 100. The channel 231 has a bent shape to prevent radiation from the accelerator from directly reaching the entrance 323 from the internal space 233. In some embodiments, the channel 231 may have multiple bent portions, such that radiation from the internal space 233 is blocked by a portion of the channel 231 closer to the internal space 233, while the remaining portion receives a safe amount of radiation for the activity of test personnel.

[0072] At step 703, the circumferential wall 3 of the shielded room 100 is constructed. In some embodiments, the operator can assemble multiple prefabricated components 50 on the foundation 2 to form the circumferential wall 3 of the shielded room 100. In other embodiments, the operator can construct the circumferential wall 3 of the shielded room 100 on-site on the foundation 2 using ordinary construction methods. The circumferential wall 3 constructed at step 703 can be as follows: Figure 9 shown. Figure 9 A schematic diagram of the circumferential wall 3 of a shielding room 100 according to an embodiment of the present invention is shown. Figure 9 As shown, the circumferential wall 3 may include a left wall 31, a front wall 32, a right wall 33, and a rear wall 34. The front wall 32 may be a discontinuous wall to form a lateral opening 321 for the accelerator to enter and exit the interior space 233 of the shielded chamber 100, and an entrance 323 for personnel to enter and exit the interior space 233 of the shielded chamber 100. The left wall 31, right wall 33, and rear wall 34 may be continuous walls. See also... Figure 9 Each of the left wall 31, front wall 32, right wall 33, and rear wall 34 of the circumferential wall 3 can have multiple layers, and the distance of each layer from the internal space 233 can increase sequentially from the inside to the outside. Taking the right wall 33 as an example, such as... Figure 9As shown, the right wall 33 may have four layers: an inner layer 331, a second inner layer 332, a second outer layer 333, and an outer layer 334, wherein the distance of each layer from the internal space 233 increases sequentially from the inside to the outside (i.e., from the inner layer 331, to the second inner layer 332, to the second outer layer 333, and then to the outer layer 334). In some embodiments, each layer of the circumferential wall 3 (e.g., the left wall 31, the front wall 32, the right wall 33, and the rear wall 34) can be formed sequentially by splicing one or more prefabricated components 50. Each layer formed by splicing one or more prefabricated components 50 may have one or more joints, which may be located between two adjacent prefabricated components. The joints on each layer of the circumferential wall 3 may be staggered from the joints on adjacent layers. The staggered joints on adjacent layers of the circumferential wall 3 enhance the airtightness of the circumferential wall 3, which is assembled from prefabricated components 50, thereby strengthening the radiation protection effect of the shielding room 100. Furthermore, it should be understood that... Figure 9 The number of layers of the circumferential wall 3 shown (including the left wall 31, the front wall 32, the right wall 33, and the rear wall 34) is merely illustrative and not restrictive. Those skilled in the art can adjust the number of layers of the circumferential wall 3 according to their actual needs.

[0073] At step 705, the top wall 4 of the shielded room 100 is constructed. In some embodiments, the operator may assemble multiple prefabricated components 50 above the circumferential wall 3 to form the top wall 4 of the shielded room 100. In other embodiments, the operator may construct the top wall 4 of the shielded room 100 on-site above the circumferential wall 3 using conventional construction methods. The top wall 4 constructed at step 705 may be as follows: Figure 10 shown. Figure 10 A schematic diagram of the circumferential wall 3 and the top wall 4 of a shielding room 100 according to an embodiment of the present invention is shown. Figure 10 As shown, the top wall 4 may be located above the circumferential wall 3. The top wall 4 may include four layers: an inner layer 41, a second inner layer 42, a second outer layer 43, and an outer layer 44. The distance of each layer from the internal space 233 may increase sequentially from the inside to the outside (i.e., from the inner layer 41, to the second inner layer 42, to the second outer layer 43, and then to the outer layer 44). In some embodiments, each layer in the top wall 4 may be formed sequentially by splicing one or more prefabricated components 50. Each layer formed by splicing one or more prefabricated components 50 may have one or more seams, which may be located between two adjacent prefabricated components. The seams on each layer of the top wall 4 may be staggered from the seams on adjacent layers. This construction, in which the seams are staggered from each other on adjacent layers of the top wall 4, can enhance the airtightness of the top wall 4 spliced ​​from the prefabricated components 50, thereby strengthening the radiation protection effect of the shielding room 100. Furthermore, it should be understood that... Figure 9The number of layers of the top wall 4 shown is merely illustrative and not limiting. Those skilled in the art can adjust the number of layers of the top wall 4 according to their actual needs.

[0074] At step 707, the side door 1 of the shielded room 100 is constructed. In some embodiments, the operator can assemble multiple prefabricated components 50 to form the side door body 11 of the side door 1 of the shielded room 100, and can subsequently install one or more air cushions 123 on the bottom surface of the side door body 11, and install an actuator 121 on the side door body 11, thereby forming the side door 1 of the shielded room. In other embodiments, the operator can construct the side door body 11 of the side door 1 of the shielded room 100 on-site using ordinary construction methods, and can subsequently install one or more air cushions 123 on the bottom surface of the side door body 11, and install an actuator 121 on the side door body 11, thereby forming the side door 1 of the shielded room. The side door 1 constructed at step 707 can be as follows: Figure 2 and Figure 3 As shown. Figure 2 and Figure 3 As shown, the side door body 11 can have multiple layers. When the side door body 11 blocks the lateral opening 321 of the front wall 32 (i.e., the side door body 11 is installed at the lateral opening 321), the distance of each layer of the side door body 11 from the internal space 233 can increase sequentially from the inside to the outside. Figure 2 and Figure 3 As shown, the side door body 11 may have seven layers. The innermost layer may be the first internal portion 111a of the side door body 11, the middle five layers may constitute the second internal portion 111b of the side door body 11, and the outermost layer may be the external portion 113 of the side door body. In some embodiments, each layer of the side door body 11 may be formed sequentially by splicing one or more prefabricated components 50. Each layer formed by splicing one or more prefabricated components 50 may have one or more seams, which may be located between two adjacent prefabricated components. The seams on each layer of the side door body 11 may be staggered from the seams on adjacent layers. This construction, in which the seams are staggered from each other on adjacent layers of the side door body 11, can enhance the sealing performance of the side door body 11 spliced ​​from the prefabricated components 50, thereby strengthening the radiation protection effect of the shielding room 100. Furthermore, it should be understood that... Figure 9 The number of layers of the side door body 11 shown is merely illustrative and not limiting. Those skilled in the art can adjust the number of layers of the side door body 11 according to their actual needs. It should also be understood that step 707 is not limited to being performed after step 705, but can be performed after or before any of the steps 701, 703 and 705 described above.

[0075] At step 709, a directional guide rail is installed. In some embodiments, the operator may install the directional guide rail near the lateral opening 321 of the front wall 32, and the installed directional guide rail may run along, for example, Figure 1 The X-axis direction shown extends to guide the side door body 11 to move in the X-axis direction. It should be understood that step 709 is not limited to being performed after step 707, but can be performed after or before any of the steps 703, 705 and 707 described above.

[0076] At step 711, the side door 1 is installed onto the directional guide rail. In some embodiments, the operator can install the side door 1, which has been constructed in step 707, onto the directional guide rail, for example, by fitting the mounting portion at the bottom of the side door body 11 onto the directional guide rail. The side door 1 installed onto the directional guide rail can move along the extension direction of the directional guide rail.

[0077] At step 713, the method 700 for constructing the shielded room 100 ends.

[0078] In embodiments where at least one component of the shielded room 100 (including the top wall 4, circumferential walls 3, or side door 1) has multiple layers, since each layer of this (or these) component has a different distance from the space where the accelerator is placed, different waste disposal methods can be applied to different layers of the abandoned components of the shielded room 100. For example, ordinary construction waste disposal can be applied to the outermost or second-outermost layer of the components of the shielded room 100, while radiation waste disposal can be applied only to the innermost layer of the components of the shielded room 100, without having to apply radiation waste disposal to all components of the entire shielded room 100, thereby reducing the difficulty and cost of handling shielded room waste. Each layer of the multi-layered shielded room 100 can be formed by splicing one or more prefabricated components 50, or it can be constructed on-site using ordinary construction methods.

[0079] Furthermore, in this invention, when the radiation content of certain layers (e.g., the inner layer of an unmaintained shielding room or the outer layer of a shielding room that has undergone multiple maintenance) of a multi-layered shielding room 100 distributed from the inside out does not meet the standards, only the inner or outer layer of the shielding room 100 can be removed and reconstructed individually. This maintains the shielding room 100 and allows it to be put back into use. This avoids the need to completely dismantle and rebuild the shielding room for parts with excessive radiation content, thereby significantly reducing the dismantling and construction costs of the shielding room.

[0080] During the manufacturing process of accelerators, it is usually necessary to test the accelerators. Figure 11A flowchart of an accelerator testing method 900 according to an embodiment of the present invention is shown. In some embodiments, method 900 may be performed using the shielded chamber 100 described above.

[0081] At step 901, a shielded chamber 100 is provided. In some embodiments, the operator may refer to the above combination. Figure 7 The described method 700 is used to construct a shielded room 100 to provide a shielded room 100 for installing or placing an accelerator.

[0082] At step 903, the side door body 11 is moved away from the lateral opening 321 of the circumferential wall 3. In some embodiments, compressed air can be injected into the air cushion 123 on the bottom surface of the side door body 11 using a high-pressure pump, thereby lifting the side door body 11. Then, the actuator 121 on the side door body 11 can drive the side door body 11, which is lifted by the inflated air cushion 123, to move in a direction away from the lateral opening 321 of the circumferential wall 3 (e.g., towards...). Figure 1 (The X-axis movement is shown in the negative direction). When the side door body 11 moves sufficiently away from the side opening 321 (a position that allows the accelerator to enter the interior space of the shielded chamber 100 from the side opening 321), the actuator 131 can stop operating. It should be understood that when the initial position of the side door body 11 is sufficient to allow the accelerator to enter the interior space of the shielded chamber 100 from the side opening 321, step 903 can be omitted.

[0083] At step 905, the accelerator is transported through the side opening 321 into the interior space of the shielded chamber 100. In some embodiments, an automated guided vehicle (AGV) or other suitable tool for transporting the accelerator may be used as the carrier, transporting the accelerator through the side opening 321 into the interior space of the shielded chamber 100. The accelerator inside the shielded chamber 100 can be installed or placed at a predetermined location within the interior space for testing operations. The AAV can leave the shielded chamber 100 after completing its transport task.

[0084] At step 907, the side door body 11 is moved closer to and blocks the lateral opening 321. In some embodiments, the actuator 121 on the side door body 11 can drive the side door body 11, supported by the inflated air cushion 123, to move toward the lateral opening 321 closer to the circumferential wall 3 (e.g., toward...). Figure 1 (Move along the positive X-axis as shown) until the inner portion 111 of the side door body 11 is within the lateral opening 321 and the inner side of the outer portion 113 of the side door body 11 contacts the front wall 32. Next, the air cushion 123 on the bottom surface of the side door body 11 can be deflated, so that the bottom surface of the side door body 11 adheres to the foundation 2. At this point, the side door body 11 successfully seals the lateral opening 321.

[0085] At step 909, a test operation is performed on the accelerator inside the shielded room 100.

[0086] In step 911, the side door body 11 is moved away from the lateral opening 321 of the circumferential wall 3. In some embodiments, compressed air can be injected into the air cushion 123 on the bottom surface of the side door body 11 using a high-pressure pump, thereby lifting the side door body 11. Then, the actuator 121 on the side door body 11 can drive the side door body 11, which is lifted by the air cushion 123, to move from the lateral opening 321 toward the direction away from the lateral opening 321 of the circumferential wall 3 (e.g., from the lateral opening 321 toward...). Figure 1 (The X-axis movement is shown in the negative direction). When the side door body 11 moves sufficiently away from the side opening 321 (a position that allows the accelerator to leave the interior space of the shielded chamber 100 from the side opening 321), the drive 131 can stop operating.

[0087] At step 913, the accelerator is transported out of the interior space of the shielded chamber 100 through the side opening 321. In some embodiments, an automated guided vehicle or other suitable tool for transporting the accelerator may move into the shielded chamber 100 through the opened side opening 321 and may be used as a carrier for the accelerator, transporting the accelerator out of the interior space of the shielded chamber 100 through the side opening 321.

[0088] After one or more accelerators that have completed testing are transported out of the shielded room, the process can return to step 905 to transport other accelerators to be tested into the interior space of the shielded room 100, thereby performing the testing operation on the accelerator.

[0089] The steps described above for methods 700 and 900 are exemplary and not intended to be limiting. Those skilled in the art may add one or more steps, delete one or more of the above steps, combine or replace one or more of the above steps, or adjust the order of one or more of the above steps as needed.

[0090] Although the invention has been described with reference to preferred embodiments of this disclosure, it is not intended to be limited thereto, but rather to be limited only by the scope set forth in the appended claims. Those skilled in the art will understand that various modifications and changes may be made to the embodiments described herein without departing from the broader spirit and scope of the invention as set forth in the appended claims.

Claims

1. A shielding chamber for an accelerator, characterized in that, The shielded room includes: Top wall; A circumferential wall, which, together with the top wall, encloses an internal space. The circumferential wall is configured to have lateral openings communicating with the internal space, allowing the accelerator to enter the internal space through these lateral openings. A side door, the side door having a side door body, the side door body being used to block the lateral opening of the circumferential wall and being movable in a first direction, the first direction being perpendicular to the plane where the lateral opening is located.

2. The shielded room as described in claim 1, characterized in that, The side door also includes a compressed air drive device, which is used to drive the side door body to move.

3. The shielded room as described in claim 2, characterized in that, The compressed air drive device includes: One or more air cushions are located on the bottom surface of the side door body, wherein each of the one or more air cushions is inflatable to support the side door body; and A driver for moving the side door body supported by the one or more air cushions.

4. The shielded room as described in claim 3, characterized in that, The one or more air cushions include multiple air cushions, which are symmetrically distributed on the bottom surface of the side door body.

5. The shielded room as described in claim 3, characterized in that, The side door body includes an inner portion and an outer portion. When the side door body blocks the lateral opening of the circumferential wall, the inner portion is located inside the lateral opening, and the outer portion is located outside the lateral opening. The inner portion has an inner height, the outer portion has an outer height, and the height of the lateral opening is greater than the inner height and less than the outer height. The bottom surface of the outer portion is flush with the bottom surface of the inner portion, and the top surface of the outer portion extends beyond the top surface of the inner portion.

6. The shielded room as described in claim 5, characterized in that, The interior portion of the side door body further includes a first interior portion and a second interior portion. When the side door body blocks the lateral opening of the circumferential wall, the first interior portion is closer to the interior space for placing the accelerator than the second interior portion. The first interior portion has a first interior height, the second interior portion has a second interior height, and the first interior height is smaller than the second interior height. The lateral opening includes a first opening portion and a second opening portion. The first opening portion is closer to the internal space for placing the accelerator than the second opening portion. The first opening portion is used to accommodate the first internal portion of the side door body, and the second opening portion is used to accommodate the second internal portion of the side door body.

7. The shielded room as described in claim 5, characterized in that, The inner portion of the side door body has an inner width, the outer portion has an outer width, and the width of the lateral opening is greater than or equal to the inner width and less than the outer width. Wherein, each of the two opposing sides of the outer portion in the width direction extends beyond the corresponding side of the inner portion.

8. The shielded room as described in claim 7, characterized in that, The outer portion has a varying outer width, which gradually increases in the direction away from the lateral opening.

9. The shielded room as described in claim 5, characterized in that, The internal portion further includes a reinforcing shielding portion embedded in at least a portion of the internal portion and extending towards the innermost side of the side door body. The bottom surface of the reinforced shielding part is flush with the bottom surface of the outer part. The enhanced shielding is formed of a material with stronger radiation blocking capabilities than other components of the side door body.

10. The shielded room as described in claim 9, characterized in that, The floor in the interior space has a stepped section that is opposite to the reinforced shielding section. The height and position of the step are designed such that when the side door body is moved to the side opening using the compressed air drive device, the top surface of the step is higher than the bottom surface of the side door body.

11. The shielded room as described in claim 1, characterized in that, The shielded room also includes a directional guide rail located near the lateral opening of the circumferential wall and extending along the first direction to guide the side door body to move in the first direction.

12. The shielded room as described in any one of claims 1-11, characterized in that, At least one of the top wall, the circumferential wall, and the side door body is formed by splicing together multiple prefabricated components.

13. The shielded room as described in claim 12, characterized in that, Each prefabricated component has at least one stepped side, which is used to adapt and splice with stepped sides of other prefabricated components.

14. The shielded room as described in claim 13, characterized in that, The two adjacent prefabricated components being spliced ​​are connected by bolts.

15. The shielded room as described in any one of claims 1-11, characterized in that, At least one of the top wall, the circumferential wall, and the side door body comprises multiple layers, the multiple layers including an inner layer and an outer layer, the inner layer being adjacent to the internal space for housing the accelerator, and the outer layer being distant from the internal space for housing the accelerator. The inner layer or the outer layer can be removed individually.

16. The shielded room as described in claim 15, characterized in that, Each layer of at least one of the top wall, the circumferential wall, and the side door body is composed of one or more prefabricated components. Each prefabricated component has at least one stepped side, which is used to adapt and splice with stepped sides of other prefabricated components.

17. The shielded room as described in claim 16, characterized in that, Each layer has one or more seams, which are located between two adjacent prefabricated components being joined. In this multi-layer structure, the seams on each layer are staggered from the seams on adjacent layers.

18. An accelerator testing method, characterized in that, The method includes: Provide a shielded room as described in any one of claims 1-17; Move the side door body away from the side opening of the circumferential wall; The accelerator is transported through the lateral opening into or out of the interior space enclosed by the circumferential walls and the top wall; and Move the side door body closer to and block the side opening.

19. The method as described in claim 18, characterized in that, Transporting the accelerator through the lateral opening into or out of the interior space enclosed by the circumferential walls and the top wall includes: An automated guided vehicle is used as a carrier for the accelerator, which is transported through the lateral opening into or out of the interior space enclosed by the circumferential walls and the top wall.

20. A construction method, characterized in that, The construction method is used to construct a shielded room as described in any one of claims 1-17.

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