Shielding chamber for accelerator and construction method therefor

Abstract

The present invention relates to a shielding chamber for an accelerator and a construction method and a treatment method therefor. The construction method includes: step a: assembling a plurality of prefabricated molds to form a circumferential wall frame; step b: injecting a building material into the circumferential wall frame to form a circumferential wall of the shielding chamber; step c: assembling a plurality of prefabricated molds to form a top wall frame on the circumferential wall; and step d: injecting a building material into the top wall frame to form a top wall of the shielding chamber, wherein the top wall together with the circumferential wall encloses an inner space for placing the accelerator.

Description

TECHNICAL FIELD

[0001] The present invention relates to the technical field of shielding protection, and in particular, to a shielding chamber for shielding protection against an accelerator.BACKGROUND

[0002] An accelerator is an important particle acceleration device that is widely applied to fields such as particle physics, medicine, material science, etc. An accelerator can accelerate charged particles to high energy for various experiments, studies, and applications. In the medical field, an accelerator can be used for radiotherapy and radiodiagnosis. For example, in tumor therapies, an accelerator can be used to accelerate charged particles to high energy and direct the high-energy particles to irradiate cancer cells, thereby killing the cancer cells without damaging surrounding normal tissues. However, during both production testing and actual use of an accelerator, the accelerator, in running, generates a large amount of radiation, including radiation of gamma rays, X-rays, and neutrons. Such radiation poses a serious threat to the surrounding environment of the accelerator and to the health of people nearby. Therefore, the accelerator needs to be shielded to reduce impact of radiation on the surrounding environment and people, and ensuring safety therefor.

[0003] Existing accelerator shielding measures mainly include: self-shielding of an accelerator as well as construction of a shielding chamber for placing an accelerator. A shielding chamber (sometimes also referred to as a shielding room or an equipment room) generally uses concrete as a shielding material, and is constructed in a conventional masonry wall building manner. However, existing shielding chambers and construction processes thereof have the following problems.

[0004] First, in an existing shielding chamber construction manner, the shielding chamber is usually constructed in the conventional masonry wall building manner. However, the conventional masonry wall building manner causes not only a long construction period but also high construction costs. In addition, the long construction work period of existing shielding chambers and the conventional construction manner also result in a greatly extended time to acquire a radiation safety license (Radiation Safety License, RSL).

[0005] Second, after the life of the accelerator ends, the existing shielding chamber generally produces a large amount of radioactive waste, including all foundation portions, all outer wall portions, and all top wall portions of the shielding chamber. Such radioactive waste brings considerable challenges with respect to the treatment difficulty and treatment costs of the radioactive waste.

[0006] Therefore, it is desirable to improve the existing shielding chamber to overcome at least one of the problems described above.SUMMARY

[0007] The technical solutions proposed by the present invention are intended to solve one or more of the above-described problems regarding a shielding chamber for shielding protection against an accelerator in the prior art.

[0008] According to a first aspect of the present invention, provided is a method for constructing a shielding chamber for an accelerator, and the method comprises: step a: assembling a plurality of prefabricated molds to form a circumferential wall frame; step b: injecting a building material into the circumferential wall frame to form a circumferential wall of the shielding chamber; step c: assembling a plurality of prefabricated molds to form a top wall frame on the circumferential wall; and step d: injecting a building material into the top wall frame to form a top wall of the shielding chamber, wherein the top wall together with the circumferential wall encloses an inner space for placing the accelerator.

[0009] In at least one embodiment of the first aspect of the present invention, the circumferential wall frame comprises an inner circumferential wall frame and an outer circumferential wall frame, the circumferential wall comprises an inner circumferential wall and an outer circumferential wall, the inner circumferential wall is close to the inner space for placing the accelerator, the outer circumferential wall is remote from the inner space for placing the accelerator; step a further comprises: assembling the plurality of prefabricated molds to form the inner circumferential wall frame and the outer circumferential wall frame; and step b further comprises: injecting the building material into the inner circumferential wall frame to form the inner circumferential wall; and injecting the building material into the outer circumferential wall frame to form the outer circumferential wall.

[0010] In at least one embodiment of the first aspect of the present invention, the top wall frame comprises an inner top wall frame and an outer top wall frame, the top wall comprises an inner top wall and an outer top wall, the inner top wall is close to the inner space for placing the accelerator, and the outer top wall is remote from the inner space for placing the accelerator; step c further comprises: assembling the plurality of prefabricated molds to form the inner top wall frame and the outer top wall frame on the circumferential wall; and step d further comprises: injecting the building material into the inner top wall frame to form the inner top wall; and injecting the building material into the outer top wall frame to form the outer top wall.

[0011] In at least one embodiment of the first aspect of the present invention, the circumferential wall is configured to have a lateral opening, and the lateral opening communicates with the inner space for the accelerator to enter the inner space from the lateral opening.

[0012] In at least one embodiment of the first aspect of the present invention, the method further comprises: step e: assembling a plurality of prefabricated molds to form a side door body frame; and step f: injecting a building material into the side door body frame to form a side door body of the shielding chamber, wherein the side door body is configured to block the lateral opening of the circumferential wall.

[0013] In at least one embodiment of the first aspect of the present invention, the side door body frame comprises an inner side door body frame and an outer side door body frame, the side door body comprises an inner side door body and an outer side door body, and when the side door body blocks the lateral opening of the circumferential wall, the inner side door body is close to the inner space for placing the accelerator, and the outer side door body is remote from the inner space for placing the accelerator; step e further comprises: assembling the plurality of prefabricated molds to form the inner side door body frame and the outer side door body frame; and step f further comprises: injecting the building material into the inner side door body frame to form the inner side door body; and injecting the building material into the outer side door body frame to form the outer side door body.

[0014] In at least one embodiment of the first aspect of the present invention, the inner circumferential wall or the outer circumferential wall of the circumferential wall is separately removable; the inner top wall or the outer top wall of the top wall is separately removable; and the inner side door body or the outer side door body of the side door body is separately removable.

[0015] In at least one embodiment of the first aspect of the present invention, the injected building material comprises a concrete material.

[0016] In at least one embodiment of the first aspect of the present invention, each prefabricated mold is connected by means of at least one of a linear screw rod and an L-shaped screw rod to an adjacent building material for forming the circumferential wall or the top wall.

[0017] In at least one embodiment of the first aspect of the present invention, the method further comprises: building a foundation of the shielding chamber for the circumferential wall frame to be formed thereon, wherein the circumferential wall is connected to the foundation by means of a plurality of bolts.

[0018] In a second aspect of the present invention, provided is a shielding chamber for an accelerator, wherein the shielding chamber is constructed by using the method according to any one of the above-described paragraphs, and the shielding chamber comprises: the circumferential wall; and the top wall, wherein the top wall together with the circumferential wall encloses an inner space for placing the accelerator.

[0019] In at least one embodiment of the second aspect of the present invention, the circumferential wall is configured to have a lateral opening, and the lateral opening communicates with the inner space for the accelerator to enter the inner space from the lateral opening, and the shielding chamber further comprises a side door body, wherein the side door body is configured to block the lateral opening of the circumferential wall.

[0020] In at least one embodiment of the second aspect of the present invention, the side door body is formed in the following way: assembling a plurality of prefabricated molds to form a side door body frame; and injecting a building material into the side door body frame to form the side door body.

[0021] In at least one embodiment of the second aspect of the present invention, the side door body frame comprises an inner side door body frame and an outer side door body frame, the side door body comprises an inner side door body and an outer side door body, and when the side door body blocks the lateral opening of the circumferential wall, the inner side door body is close to the inner space for placing the accelerator, and the outer side door body is remote from the inner space for placing the accelerator; and the side door body is further formed in the following way: assembling the plurality of prefabricated molds to form the inner side door body frame and the outer side door body frame; injecting the building material into the inner side door body frame to form the inner side door body; and injecting the building material into the outer side door body frame to form the outer side door body.

[0022] In a third aspect of the present invention, provided is a shielding chamber for an accelerator, and the shielding chamber comprises: a plurality of wall prefabricated modules, wherein the plurality of wall prefabricated modules constitute a circumferential wall; a plurality of top wall prefabricated modules, wherein the plurality of top wall prefabricated modules constitute a top wall, and the top wall together with the circumferential wall encloses an inner space for placing the accelerator; and a building material, wherein the building material is filled between adjacent ones of the plurality of wall prefabricated modules and between adjacent ones of the plurality of top wall prefabricated modules.

[0023] In at least one embodiment of the third aspect of the present invention, the wall prefabricated modules and the top wall prefabricated modules each internally comprise at least one of a linear screw rod and an L-shaped screw rod.

[0024] In at least one embodiment of the third aspect of the present invention, each prefabricated module in the plurality of wall prefabricated modules and the plurality of top wall prefabricated modules has a thickness ranging from 1 meter to 5 meters, each prefabricated module comprises at least two prefabricated molds, and each prefabricated mold has a weight less than 1 ton; and the building material filled between two adjacent prefabricated modules has a thickness ranging from 0.5 centimeter to 10 centimeters.

[0025] In at least one embodiment of the third aspect of the present invention, the plurality of wall prefabricated modules comprise a plurality of inner wall prefabricated modules and a plurality of outer wall prefabricated modules, the plurality of inner wall prefabricated modules constitute an inner circumferential wall, the plurality of outer wall prefabricated modules constitute an outer circumferential wall, the inner circumferential wall is close to the inner space for placing the accelerator, and the outer circumferential wall is remote from the inner space for placing the accelerator; and the plurality of top wall prefabricated modules comprise a plurality of inner top wall prefabricated modules and a plurality of outer top wall prefabricated modules, the plurality of inner top wall prefabricated modules constitute an inner top wall, the plurality of outer top wall prefabricated modules constitute an outer top wall, the inner top wall is close to the inner space for placing the accelerator, and the outer top wall is remote from the inner space for placing the accelerator.

[0026] In a fourth aspect of the present invention, provided is a method for treating a shielding chamber, wherein the shielding chamber is fabricated by using the method according to the above-described paragraphs, and the shielding chamber comprises: the circumferential wall, wherein the circumferential wall comprises the inner circumferential wall and the outer circumferential wall; and the top wall, wherein the top wall together with the circumferential wall encloses an inner space for placing the accelerator, and the top wall comprises the inner top wall and the outer top wall; and the method comprises: performing a first treatment for radioactive waste on at least a portion of the inner circumferential wall and at least a portion of the inner top wall, wherein the inner circumferential wall and the inner top wall are close to the inner space for placing the accelerator; and performing a second treatment for common building waste on the outer circumferential wall and the outer top wall, wherein the outer circumferential wall and the outer top wall are remote from the inner space for placing the accelerator.

[0027] In a fifth aspect of the present invention, provided is a method for treating a shielding chamber, wherein the shielding chamber is the shielding chamber according to the above-described paragraphs, and the method comprises: performing a first treatment for radioactive waste on at least some of the plurality of inner wall prefabricated modules and at least some of the plurality of inner top wall prefabricated modules; and performing a second treatment for common building waste on the plurality of outer wall prefabricated modules and the plurality of outer top wall prefabricated modules.BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to further describe the previous and other advantages and features in the embodiments of the present invention, more detailed descriptions of the embodiments of the present invention will be presented with reference to the accompanying drawings. It should be understood that these accompanying drawings delineate only typical embodiments of the present invention, and thus will not be considered as a limitation on the scope of protection claimed by the present invention. FIG. 1 shows a flowchart of a method for constructing a shielding chamber according to an embodiment of the present invention. FIG. 2 shows a schematic diagram of a foundation for constructing a plurality of shielding chambers according to an embodiment of the present invention. FIG. 3 shows an example process of forming a circumferential wall frame. FIG. 4 shows a schematic diagram of forming a circumferential wall frame on a first sub-foundation in FIG. 2 according to an embodiment of the present invention. FIG. 5 shows an example process of forming a circumferential wall. FIG. 6 shows a schematic diagram of a circumferential wall according to an embodiment of the present invention. FIG. 7 shows a schematic diagram of a top wall frame formed on a circumferential wall according to an embodiment of the present invention. FIG. 8 shows a schematic diagram of a top wall formed on a circumferential wall according to an embodiment of the present invention. FIG. 9 shows a schematic structural diagram of a plurality of shielding chambers including a plurality of side door bodies according to an embodiment of the present invention. FIG. 10 shows a schematic structural diagram of a shielding chamber according to some embodiments of the present invention. FIG. 11 shows a schematic diagram of a partial cross section of a shielding chamber according to some embodiments of the present invention. FIG. 12 shows a schematic diagram of connections using a linear screw rod and an L-shaped screw rod according to some embodiments of the present invention. FIG. 13 shows a method for treating a shielding chamber according to some embodiments of the present invention. FIG. 14 shows another method for treating a shielding chamber according to some embodiments of the present invention. DETAILED DESCRIPTION

[0029] The present invention will be further described below with reference to specific embodiments and the accompanying drawings. More details are set forth in the following description in order to facilitate thorough understanding of the present invention, but it will be clear that the present invention can be implemented in many other forms other than those described herein, and those skilled in the art can, without departing from the essence of the present invention, make similar alterations and modifications according to practical applications. Therefore, the scope of protection of the present invention should not be limited by the content of the specific embodiments.

[0030] Specific terms have been used in the present application to describe the embodiments of the present application. For example, "an embodiment", "another embodiment", and / or "some embodiments" refer to a certain feature, structure, or characteristic related to at least one embodiment of the present application. Therefore, it should be emphasized and noted that two or more references to "an embodiment", "another embodiment", or "some embodiments" in various places in this specification are not necessarily referring to the same embodiment. In addition, certain features, structures, or characteristics of one or more embodiments of the present application may be properly combined.

[0031] It should be noted that in the description of the embodiments of the present application, various features are sometimes incorporated into one embodiment, accompanying drawing, or description thereof in the present disclosure for the purpose of streamlining the descriptions disclosed in the present application and aiding in the understanding of one or more embodiments. However, this disclosure method does not mean that the present application object needs more features than the features mentioned in the claims.

[0032] In the descriptions of the present disclosure, it should be noted that directions or position relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", and the like described herein are based on the directions or position relationships shown by the accompanying drawings, which are used only for describing the present disclosure and for brevity of description, but do not indicate or imply that an indicated device or component must have a specific direction or must be constructed and operated in a specific direction. Therefore, this cannot be understood as a limitation on the present disclosure. In addition, the terms "first" and "second" are used only for descriptive purposes and cannot be construed as indicating or implying relative importance. In the descriptions of the present disclosure, it should be noted that, unless otherwise expressly specified and defined, the terms "installation", "connect", "connection", and "coupling" should be understood in a broad sense, which, for example, may be a fixed connection or a detachable connection; may be a mechanical connection or an electrical connection; may be a direct connection or an indirect connection by means of an intermediate medium; or may be internal communication between two elements. Those of ordinary skill in the art can understand the specific meanings of the above-described terms in the present disclosure according to the specific situation.

[0033] Herein, expressions related to "inner" and "outer" may be used to indicate a degree of proximity to an inner space of a shielding chamber, wherein "inner" is closer to the inner space of the shielding chamber than "outer".

[0034] FIG. 1 shows a flowchart of a method 1000 for constructing a shielding chamber according to an embodiment of the present invention. The shielding chamber constructed in accordance with the method 1000 described in FIG. 1 may be suitable for installing or placing an accelerator therein. The shielding chamber can prevent radiation produced by the accelerator from affecting a surrounding environment and people around in a running process of the accelerator (e.g., in an operation process after the accelerator is officially put into use, or in a radiation testing process during manufacturing of the accelerator). As an example, the accelerator may include a cyclotron, a linear accelerator, etc.

[0035] At step 1001, a foundation 2 (see FIG. 2) is built. In some embodiments, the foundation 2 may be built on a ground configured to construct the shielding chamber, as shown in FIG. 2. FIG. 2 shows a schematic diagram of a foundation 2 for constructing a plurality of shielding chambers according to an embodiment of the present invention. As shown in FIG. 2, the foundation 2 may include a first sub-foundation 20, a second sub-foundation 20', and a third sub-foundation 20", and one shielding chamber may be constructed on each sub-foundation. For example, a first shielding chamber may be constructed on the first sub-foundation 20, a second shielding chamber may be constructed on the second sub-foundation 20', and a third shielding chamber may be constructed on the third sub-foundation 20".

[0036] Construction of the foundation 2 is described below by using the first sub-foundation 20 as an example. The first sub-foundation 20 may include wall foundations and an internal passage 25. The wall foundations may include a left wall foundation 21, a front wall foundation 22, a right wall foundation 23, and a rear wall foundation 24. The left wall foundation 21 may be configured to form a left wall frame 31 (not shown in FIG. 2; see FIG. 4) thereon, and further form a left wall 41 (not shown in FIG. 2; see FIG. 6) thereon. The front wall foundation 22 may be configured to form a front wall frame 32 (not shown in FIG. 2; see FIG. 4) thereon, and further form a front wall 42 (not shown in FIG. 2; see FIG. 6) thereon. The right wall foundation 23 may be configured to form a right wall frame 33 (not shown in FIG. 2; see FIG. 4) thereon, and further form a right wall 43 (not shown in FIG. 2; see FIG. 6) thereon. The rear wall foundation 24 may be configured to form a rear wall frame 34 (not shown in FIG. 2; see FIG. 4) thereon, and further form a rear wall 44 (not shown in FIG. 2; see FIG. 6) thereon. As shown in FIG. 2, the left wall foundation 21 of the first sub-foundation 20 may also serve as a right wall foundation of the second sub-foundation 20', and the left wall frame 31 and the left wall 41 of the first shielding chamber formed on the left wall foundation 21 of the first sub-foundation 20 may serve as a right wall frame and a right wall of the second shielding chamber formed on the second sub-foundation 20', respectively. The internal passage 25 may further include a maze passage 251 and an inner space 253 for installing or placing an accelerator. One end of the maze passage 251 may be connected to the inner space 253, the other end thereof may be connected to an entrance 441, and the entrance 441 can allow people to enter the inner space 253 of a shielding chamber 100 therefrom. As shown, the maze passage 251 may have a bent shape to prevent radiation produced by the accelerator from directly reaching the entrance 441 from the inner space 253. In some embodiments, the maze passage 251 may have a plurality of bending portions, such that radiation from the inner space 253 is blocked by a portion of the maze passage 251 that is closer to the inner space 253, while the remaining passage is exposed to a safe amount of radiation for activities by test personnel.

[0037] In the embodiment shown in FIG. 2, the foundation 2 is shown as including three sub-foundations and being configured to construct three shielding chambers. However, the present invention is not limited thereto, and those skilled in the art may build a foundation 2 that includes only one sub-foundation and that is configured to construct one shielding chamber, or build a foundation 2 that includes another number of sub-foundations and that is configured to construct a corresponding number of shielding chambers, as required.

[0038] At step 1003, a plurality of prefabricated molds 10 are assembled to form a circumferential wall frame 3 (see FIG. 4). In some embodiments, the plurality of prefabricated molds 10 may be assembled on the foundation 2 to form the circumferential wall frame 3. The circumferential wall frame 3 formed may be a single-layer circumferential wall frame or a multi-layer circumferential wall frame. All layers of the multi-layer circumferential wall frame may be sequentially distributed from inside out. As an example, a two-layer circumferential wall frame is described below with reference to FIG. 3 and FIG. 4. In an embodiment in which the circumferential wall frame 3 formed is a two-layer circumferential wall frame, step 1003 may further include sub-step 1003-1 and sub-step 1003-2, as shown in FIG. 3. FIG. 3 shows an example process of forming a circumferential wall frame 3. At sub-step 1003-1, a plurality of prefabricated molds 10 are assembled to form an inner circumferential wall frame. At sub-step 1003-2, a plurality of prefabricated molds 10 are assembled to form an outer circumferential wall frame. An inner wall may be shared between the inner circumferential wall frame and the outer circumferential wall frame. Sub-step 1003-1 may be performed before, after, or concurrently with sub-step 1003-2. The circumferential wall frame 3 may include the inner circumferential wall frame formed at step 1003-1 and the outer circumferential wall frame formed at step 1003-2.

[0039] As an example, the circumferential wall frame 3 formed may be as shown in FIG. 4. FIG. 4 shows a schematic diagram of forming a circumferential wall frame 3 on a first sub-foundation 20 in FIG. 2 according to an embodiment of the present invention. As shown in FIG. 4, the circumferential wall frame 3 may include a left wall frame 31, a front wall frame 32, a right wall frame 33, and a rear wall frame 34. The left wall frame 31 may include a left inner wall frame 312 and a left outer wall frame 314, and an inner wall 313 may be shared between the left inner wall frame 312 and the left outer wall frame 314. The front wall frame 32 may include a front inner wall frame 322 and a front outer wall frame 324, and an inner wall 323 may be shared between the front inner wall frame 322 and the front outer wall frame 324. The right wall frame 33 may include a right inner wall frame 332 and a right outer wall frame 334, and an inner wall 333 may be shared between the right inner wall frame 332 and the right outer wall frame 334. The rear wall frame 34 may include a rear inner wall frame 342 and a rear outer wall frame 344, and an inner wall 343 may be shared between the rear inner wall frame 342 and the rear outer wall frame 344. The inner circumferential wall frame formed at step 1003-1 may include the left inner wall frame 312, the front inner wall frame 322, the right inner wall frame 332, and the rear inner wall frame 342. The outer circumferential wall frame formed at step 1003-2 may include the left outer wall frame 314, the front outer wall frame 324, the right outer wall frame 334, and the rear outer wall frame 344.

[0040] Referring to FIG. 4, one prefabricated mold 10 for assembling with other prefabricated molds to form a frame is further shown. The prefabricated mold 10 may be a standardized member mass-produced in advance and may be made of a concrete material or another material suitable for radiation shielding. In some embodiments, the prefabricated mold 10 may have a weight less than 1 ton. Compared with constructing a shielding chamber on site in a conventional masonry wall building manner, in the present invention, the prefabricated molds 10 simply need to be assembled on site and a building material (which will be described in detail below) is injected into a frame formed by assembling the prefabricated molds 10. This can greatly reduce a construction time, construction difficulty, and construction costs of a shielding chamber. Reduction in the construction time of a shielding chamber can in turn reduce a time to acquire an RSL. In addition, the prefabricated mold 10 may be produced as a standardized member, and this can allow for standardization or mass construction of shielding chambers. Shielding chambers constructed in a standardized manner can enable a review and evaluation process of a subsequently constructed shielding chamber during RSL application to be simplified after the first constructed shielding chamber has acquired an RSL, thereby further shortening the time to acquire an RSL. Compared with direct assembling of relatively heavy prefabricated members to form a shielding chamber, in the present invention, the prefabricated molds 10 are lighter in weight. This can avoid a need for a relatively large lifting space at a construction site to lift relatively heavy members. In this way, a site restriction on construction of a shielding chamber can be reduced, thereby allowing a shielding chamber to be constructed in a scenario (e.g., a hospital) with an insufficient lifting space.

[0041] At step 1005, a building material is injected into the circumferential wall frame 3 to form a circumferential wall 4 (see FIG. 6) of the shielding chamber. The injected building material may include a concrete material. In some embodiments, the circumferential wall 4 formed may be a single-layer circumferential wall or a multi-layer circumferential wall. All layers of the multi-layer circumferential wall may be sequentially distributed from inside out along a thickness direction of the circumferential wall 4. As an example, a two-layer circumferential wall is described below with reference to FIG. 5 and FIG. 6. In an embodiment in which the circumferential wall 4 formed is a two-layer circumferential wall, step 1005 may further include sub-step 1005-1 and sub-step 1005-2, as shown in FIG. 5. FIG. 5 shows an example process of forming a circumferential wall 4. At sub-step 1005-1, the building material is injected into the inner circumferential wall frame to form an inner circumferential wall of the shielding chamber. At sub-step 1005-2, the building material is injected into the outer circumferential wall frame to form an outer circumferential wall of the shielding chamber. Sub-step 1005-1 may be performed before, after, or concurrently with sub-step 1005-2. The circumferential wall 4 may include the inner circumferential wall formed at step 1005-1 and the outer circumferential wall formed at step 1005-2. As the circumferential wall 4 is shaped in layers, each layer (e.g., the inner circumferential wall or the outer circumferential wall) in the circumferential wall 4 is separately removable. As an example, the circumferential wall 4 formed may be as shown in FIG. 6. FIG. 6 shows a schematic diagram of a circumferential wall 4 according to an embodiment of the present invention. The circumferential wall 4 may include the left wall 41 (which is not fully shown in FIG. 6), the front wall 42, the right wall 43, and the rear wall 44. The left wall 41 may include a left inner wall 412 and a left outer wall 414. The front wall 42 may include a front inner wall 422 and a front outer wall 424. The right wall 43 may include a right inner wall 432 and a right outer wall 434. The rear wall 44 may include a rear inner wall 442 and a rear outer wall 444. The inner circumferential wall formed at step 1005-1 may include the left inner wall 412, the front inner wall 422, the right inner wall 432, and the rear inner wall 442. The outer circumferential wall formed at step 1005-2 may include the left outer wall 414, the front outer wall 424, the right outer wall 434, and the rear outer wall 444. As shown in FIG. 6, the inner circumferential wall may be closer to the inner space 253 for placing or installing an accelerator than the outer circumferential wall. In addition, it should be understood that the construction of the circumferential wall 4 (e.g., including the walls located at the front, rear, left, and right to form an approximately polyhedral construction) shown in FIG. 6 is merely exemplary and non-limiting. Those skilled in the art may adjust the construction of the circumferential wall 4 according to actual needs, for example, adjust the construction of the circumferential wall 4 to be approximately a cylinder.

[0042] The circumferential wall frame 3 may further include a plurality of linear screw rods and / or a plurality of L-shaped screw rods, and the linear screw rods and / or the L-shaped screw rods may be configured to connect the prefabricated molds 10 to the building material injected into the circumferential wall frame 3, thereby enhancing structural stability of the circumferential wall 4 formed. In addition, the circumferential wall 4 may be connected to the foundation by means of a plurality of bolts.

[0043] At step 1007, a plurality of prefabricated molds 10 are assembled to form a top wall frame 5 (see FIG. 7). In some embodiments, the plurality of prefabricated molds 10 may be assembled on the circumferential wall 4 to form the top wall frame 5. The top wall frame 5 formed may be a single-layer top wall frame. As an example, the top wall frame 5 formed may be as shown in FIG. 7. FIG. 7 shows a schematic diagram of a top wall frame 5 formed on a circumferential wall 4 according to an embodiment of the present invention.

[0044] In another embodiment, the top wall frame 5 formed may be a multi-layer top wall frame. All layers of the multi-layer top wall frame may be sequentially distributed from inside out (i.e., from the bottom up). As an example, in an embodiment in which the top wall frame 5 formed is a two-layer top wall frame, step 1007 may further include: sub-step (1): assembling a plurality of prefabricated molds to form an inner top wall frame; and sub-step (2): assembling a plurality of prefabricated molds to form an outer top wall frame.

[0045] At step 1009, a building material is injected into the top wall frame 5 to form a top wall 6 (see FIG. 8) of the shielding chamber. The injected building material may include a concrete material. In some embodiments, the top wall 6 formed may be a single-layer top wall. As an example, the top wall 6 formed may be as shown in FIG. 8. FIG. 8 shows a schematic diagram of a top wall 6 formed on a circumferential wall 4 according to an embodiment of the present invention. As shown in FIG. 8, the top wall 6 may be located above the circumferential wall 4, and together with the circumferential wall 4, enclose the inner space 253 for placing or installing an accelerator.

[0046] In another embodiment, the top wall formed may be a multi-layer top wall. All layers of the multi-layer top wall may be sequentially distributed from inside out (i.e., from the bottom up) along a thickness direction of the top wall 6. As an example, in an embodiment in which the top wall 6 formed is a two-layer top wall, step 1009 may further include: sub-step (1): injecting the building material into the inner top wall frame to form an inner top wall; and sub-step (2): injecting the building material into the outer top wall frame to form an outer top wall. The inner top wall may be located below the outer top wall, and therefore may be closer to the inner space 253 for placing or installing an accelerator than the outer top wall. Sub-step 1009(1) for forming the inner top wall (i.e., injecting the building material into the inner top wall frame to form the inner top wall) may be performed before above-described sub-step 1007(1) for forming the outer top wall frame (i.e., assembling the plurality of prefabricated molds to form the outer top wall frame). That is, after the inner top wall is formed, the outer top wall frame may be formed by assembling the plurality of prefabricated molds on the inner top wall. After the outer top wall frame is formed, sub-step 1009(2) for forming the outer top wall may be performed, that is, the building material may be injected into the outer top wall frame to form the outer top wall. As the top wall 6 is shaped in layers, each layer (e.g., the inner top wall or the outer top wall) in the top wall 6 is separately removable.

[0047] The top wall frame 4 may further include a plurality of linear screw rods and / or a plurality of L-shaped screw rods, and the linear screw rods and / or the L-shaped screw rods may be configured to connect the prefabricated molds 10 to the building material injected into the top wall frame 4, thereby enhancing structural stability of the top wall 6 formed.

[0048] In some embodiments, as shown in FIG. 6 to FIG. 8, the front wall 42 of the circumferential wall 4 may have a lateral opening 421, and the lateral opening 421 may extend along a thickness direction of the front wall 42 and communicate with the inner space 253 of the shielding chamber. The accelerator can enter and exit the inner space 253 of the shielding chamber through the lateral opening 421. In an embodiment in which the circumferential wall 4 has the lateral opening 421, a side door body is provided to block the lateral opening 421, so as to prevent radiation produced by an accelerator installed or placed in the inner space 253 from leakage. The side door body may be formed by first forming a side door body frame and then injecting a building material into the side door body frame.

[0049] In another embodiment, the circumferential wall 4 may have no lateral opening 421. After the circumferential wall 4 is formed, an accelerator may be first lifted from above into the inner space 253 of the shielding chamber and then the top wall may be built. After the top wall 6 has been built, the construction of the shielding chamber can be completed. A shielding chamber without the lateral opening 421 may be suitable for use in an accelerator operation scenario, e.g., a hospital scenario. In such an operation scenario, the accelerator does not need to be frequently carried in or out of the shielding chamber. When used in an accelerator testing scenario, a lateral opening may be retained to facilitate carrying of the accelerator in or out of the inner space 253 of the shielding chamber through the lateral opening before and after accelerator testing.

[0050] At optional step 1011, a plurality of prefabricated molds 10 are assembled to form a side door body frame. In some embodiments, the side door body frame formed may be a single-layer side door body frame or a multi-layer side door body frame. All layers of the multi-layer side door body frame may be sequentially distributed from inside out. As an example, in an embodiment in which the side door body frame formed is a two-layer side door body frame, step 1011 may further include: sub-step (1): assembling a plurality of prefabricated molds to form an inner side door body frame; and sub-step (2): assembling a plurality of prefabricated molds to form an outer side door body frame.

[0051] At optional step 1013, a building material is injected into the side door body frame to form a side door body 7 (see FIG. 9) of the shielding chamber. The injected building material may include a concrete material. In some embodiments, the side door body 7 formed may be a single-layer side door body or a multi-layer side door body. All layers of the multi-layer side door body may be sequentially distributed from inside out along a thickness direction of the side door body 7. As an example, in an embodiment in which the side door body 7 formed is a two-layer side door body, step 1013 may further include: sub-step (1): injecting the building material into the inner side door body frame to form an inner side door body; and sub-step (2): injecting the building material into the outer side door body frame to form an outer side door body. As the side door body 7 is shaped in layers, each layer (e.g., the inner side door body or the outer side door body) in the side door body 7 is separately removable. As an example, the side door body 7 formed may be as shown in FIG. 9. FIG. 9 shows a schematic structural diagram of a plurality of shielding chambers including a plurality of side door bodies 7 according to an embodiment of the present invention. FIG. 9 shows two identically constructed shielding chambers 100, as well as two identical side door bodies 7 used for the two shielding chambers, respectively. As shown in FIG. 9, the side door body 7 may include an inner side door body 71 and an outer side door body 73. When the side door body 7 blocks the lateral opening 421 of the circumferential wall 4, the inner side door body 71 may be closer to the inner space 253 for placing an accelerator (not shown in FIG. 9) than the outer side door body 73, and the outer side door body 73 may be more remote from the inner space 253 for placing an accelerator than the inner side door body 71.

[0052] At step 1015, the method 1000 for constructing a shielding chamber ends.

[0053] The steps described above with respect to the method 1000 are exemplary and not intended to constitute a limitation. Those skilled in the art may add one or more steps, or delete one or more of the above-described steps, or combine or replace one or more of the above-described steps, or adjust an order of one or more of the above-described steps as required.

[0054] FIG. 10 shows a schematic structural diagram of a shielding chamber 100 according to some embodiments of the present invention. The shielding chamber 100 may be constructed by using the method 1000 described above. As shown in FIG. 10, the shielding chamber 100 may include a circumferential wall 4 and a top wall 6. The circumferential wall 4 together with the top wall 6 may enclose an inner space 253 for placing or installing an accelerator. The circumferential wall 4 may have an inner circumferential wall and an outer circumferential wall, and the inner circumferential wall may be closer to the inner space 253 for installing or placing an accelerator than the outer circumferential wall. The top wall 6 may have an inner top wall and an outer top wall, and the inner top wall may be closer to the inner space 253 for installing or placing an accelerator than the outer top wall.

[0055] Referring to FIG. 10, the circumferential wall 4 may have a lateral opening 421, and the shielding chamber 100 may further include a side door body 7. The side door body 7 may be configured to block the lateral opening 421 of the circumferential wall 4. The side door body 7 may have an inner side door body 71 and an outer side door body 73, and the inner side door body 71 may be closer to the inner space 253 for installing or placing an accelerator than the outer side door body 73. The dimensions (e.g., the height, the width, and the thickness) of portions (e.g., the inner side door body 71 and the outer side door body 73) of the side door body 7 may match the dimensions of the lateral opening 421, and a surface shape of the side door body 7 may mate with a wall (e.g., formed on a front wall 42 and the top wall 6) of the lateral opening 421, such that the side door body 7 can seal the lateral opening 421 to avoid radiation leakage during accelerator testing. For example, the height of the lateral opening 421 may be greater than the inner height of the inner side door body 71 and less than the outer height of the outer side door body 73, such that when the side door body 7 blocks the lateral opening 421 of the circumferential wall 4 (i.e., the side door body 7 is installed in place at the lateral opening 421), the inner side door body 71 may be located inside the lateral opening 421 while the outer side door body 73 may be located outside the lateral opening 421. A bottom surface of the outer side door body 73 may be flush with a bottom surface of the inner side door body 71, such that when the side door body 7 is installed in place at the lateral opening 421, both the bottom surface of the inner side door body 71 and the bottom surface of the outer side door body 73 may come into contact with a ground or a foundation. A top surface of the outer side door body 73 along a height direction (i.e., an H direction of FIG. 10) may exceed a top surface of the inner side door body 71, such that when the side door body 7 is installed in place at the lateral opening 421, the outer side door body 73 may seal a gap between the inner side door body 71 and the lateral opening 421 from above outside the lateral opening 421, so as to prevent radiation produced during running of the accelerator from leakage through the gap. For another example, the width of the lateral opening 421 may be greater than or equal to the inner width of the inner side door body 71 and may be less than the outer width of the outer side door body 73, such that when the side door body 7 blocks the lateral opening 421 of the circumferential wall 4, the inner side door body 71 may be located inside the lateral opening 421 while the outer side door body 73 may be located outside the lateral opening 421. Each of two opposite side surfaces of the outer side door body 73 along a width direction (i.e., a W direction of FIG. 10) may exceed a respective side surface of the inner side door body 71, such that when the side door body 7 is installed in place at the lateral opening 421, the outer side door body 73 may seal a gap between the inner side door body 71 and the lateral opening 421 from both sides outside the lateral opening 421, so as to prevent radiation produced during running of the accelerator from leakage through the gap. In a further embodiment, the outer side door body 73 may have a varying outer width that gradually increases along a direction away from the lateral opening 421. This gradually increasing outer width can further enhance the sealing performance of the side door body 7 for the lateral opening 421, thereby further improving the radiation shielding effect of the shielding chamber.

[0056] In an accelerator testing scenario, the side door body 7 needs to be moved frequently for the accelerator to be carried in or out of the inner space 253 of the shielding chamber 100 through the lateral opening 421. In this case, the side door body 7 may further include a compressed air driving device (not shown in the figure), and the compressed air driving device may include a driver and one or more air cushions. The driver may be located on an outer side of the side door body 7. The one or more air cushions may be symmetrically distributed on a bottom surface of the side door body 7. Each of these air cushions may be injected with compressed air via a high-pressure pump. The high-pressure pump may be located on the outer side of the side door body 7 and may be detachably connected to one end of an air duct, and the other end of the air duct may be connected to a compressor. The compressor may be located outside the shielding chamber 100. An inflated air cushion can jack up the side door body 7, such that the side door body 7 is off the ground. When the side door body 7 is jacked up by the inflated air cushion, the driver may drive the side door body 7 to move. As an example, the driver may be a compressed air driving motor that can convert pressure energy of compressed air into mechanical kinetic energy, thereby driving the side door body 7 to move. In some embodiments, the side door body 7 may be constructed from a concrete material. Due to the need for shielding protection, it is also possible to require the side door body to have a relatively large thickness, which results in a very heavy weight of the side door body 7, e.g., up to 60 tons. To achieve multiple repeated and fast movements of the extremely heavy side door body 7, in the present invention, the compressed air driving device including the driver and the air cushions is provided, such that the side door body 7 is jacked up by using inflated air cushions and is off the ground. This greatly reduces a frictional force between the side door body 7 and a contact surface thereof, thereby reducing power needed by the driver to drive the side door body 7 to move, and further promoting fast opening and closing of the lateral opening 421 of the shielding chamber 100 by the side door body 7. In some embodiments, as shown in FIG. 10, the side door body 7 may further include a reinforced shielding portion 75. The reinforced shielding portion 75 may be embedded into at least a portion of the inner side door body 71 and extend toward the innermost side of the side door body 7. A bottom surface of the reinforced shielding portion 75 may be flush with the bottom surface of the outer side door body 73. The reinforced shielding portion 75 may be made of a material having a stronger radiation blocking capability than another constituent portion of the side door body 7. For example, the reinforced shielding portion 75 may include at least one of a boron-containing polyethylene material and a lead material, and the another constituent portion of the side door body 7 may include a concrete material. Compared with the concrete material, the boron-containing polyethylene material or the lead material can more effectively absorb rays and prevent the rays from leakage caused by refraction. In some embodiments, a first set of air cushions in the compressed air driving device may be located on the bottom surface of the protruding portion 75, and a second set of air cushions may be located on a bottom surface of the another constituent portion of the side door body 7 other than the reinforced shielding portion 75.

[0057] In some embodiments, as shown in FIG. 10, the ground in the inner space 253 of the shielding chamber 100 may form a stepped portion 26. The stepped portion 26 may be formed due to the ground height of the inner space 253 being greater than the ground height at the lateral opening 421. The stepped portion 26 may be made opposite to the reinforced shielding portion 75 of the side door body 7 during or after installation of the side door body 7 at the lateral opening 421. The height and position of the stepped portion 26 may be such designed that a top surface of the stepped portion 26 is higher than the bottom surface of the side door body 7 in a process in which the compressed air driving device is used to drive the side door body 7 to move to the lateral opening 421. In the process in which the compressed air driving device is used to drive the side door body 7 to move to the lateral opening 421, the bottom surface of the side door body 7 is jacked up by the air cushions such that the bottom surface of the side door body 7 has a certain height from the ground. At this time, the top surface of the stepped portion 26 may be still higher than the bottom surface of the side door body 7. In this way, radiation can be prevented from leakage through the bottom surface of the side door body 7 that has the certain height from the ground. In addition, when the side door body 7 is installed in place at the lateral opening 421 and the side door body 7 is no longer jacked up by the air cushions, the top surface of the stepped portion 26 is still higher than the bottom surface of the side door body 7. At this time, even if there is a gap between the bottom surface of the side door body 7 installed in place and the ground (e.g., a gap caused by unevenness of the bottom surface of the side door body 7 and / or the ground), the higher stepped portion 26 can prevent radiation produced during running of the accelerator from leakage through the gap.

[0058] As described above, the shielding chamber 100 having the lateral opening 421 and the side door body 7 may be usually suitable for an accelerator testing scenario to facilitate carrying of the accelerator in or out of the inner space 253 of the shielding chamber 100 through the lateral opening 421 before and after accelerator testing. In another embodiment, the shielding chamber 100 may not have the lateral opening 421 and the side door body 7. This shielding chamber may be usually suitable for an accelerator operation scenario, e.g., a hospital scenario. In such an operation scenario, the accelerator does not need to be frequently carried in or out of the shielding chamber. However, it should be understood that although a shielding chamber having the lateral opening and the side door body is usually suitable for an accelerator testing scenario, this does not mean that the shielding chamber having the lateral opening and the side door body has to be applied to an accelerator testing scenario. Instead, such a shielding chamber may also be applied to an accelerator operation scenario, e.g., a hospital scenario. In addition, although a shielding chamber without the lateral opening and the side door body is usually suitable for an accelerator operation scenario, this does not mean that the shielding chamber without the lateral opening and the side door body has to be applied to an accelerator operation scenario. Instead, such a shielding chamber may also be applied to an accelerator testing scenario.

[0059] In some embodiments, during construction of a shielding chamber that is used for an accelerator operation scenario (e.g., a hospital scenario) and that has a lateral opening and a side door body, a circumferential wall having the lateral opening may be first built, and then an accelerator may be carried into an inner space of the shielding chamber through the lateral opening. After the accelerator is carried into the shielding chamber, a side door body frame may be first formed at the lateral opening of the circumferential wall and a top wall frame may be formed above the circumferential wall. Then, a building material may be injected into the side door body frame and the top wall frame from above the circumferential wall to form the side door body and a top wall. In one aspect, by forming the side door body frame directly at the lateral opening and injecting the building material into the side door body frame to form the side door body, the side door body formed may be regarded as a portion of the circumferential wall. A gap between the side door body and another wall portion of the circumferential wall is very small, and this can effectively reduce or avoid radiation leakage during operation of the accelerator. In another aspect, by building the circumferential wall having the lateral opening and carrying the accelerator before blocking the lateral opening, the accelerator can be conveniently carried into the shielding chamber through the lateral opening, thereby effectively reducing difficulty in and a space limitation on carrying the accelerator.

[0060] In some other embodiments, during construction of a shielding chamber that is used for an accelerator operation scenario (e.g., a hospital scenario) and that has a lateral opening and a side door body, a circumferential wall having the lateral opening and a top wall may be first built, and then an accelerator may be carried into an inner space of the shielding chamber through the lateral opening. After the accelerator is carried into the shielding chamber, a side door body frame may be first formed at the lateral opening of the circumferential wall, an injection opening for injecting a building material therein may be reserved on an outer side surface of the side door body frame, and then a building material may be injected into the side door body frame through the injection opening, thereby forming the side door body. Constructing a shielding chamber in this way may have the following advantages: first, since the accelerator is carried into the shielding chamber after the circumferential wall and the top wall are formed, the possibility of the accelerator being damaged during the construction of the shielding chamber can be reduced; second, by forming the side door body frame directly at the lateral opening and injecting the building material into the side door body frame to form the side door body, the side door body formed may be regarded as a portion of the circumferential wall, wherein a gap between the side door body and another wall portion of the circumferential wall is very small, and this can effectively reduce or avoid radiation leakage during operation of the accelerator; and third, by building the circumferential wall having the lateral opening and carrying the accelerator before blocking the lateral opening, the accelerator can be conveniently carried into the shielding chamber through the lateral opening, thereby effectively reducing difficulty in and a space limitation on carrying the accelerator. The shielding chamber 100 is described below from another perspective with reference to FIG. 11. FIG. 11 shows a schematic diagram of a partial cross section of a shielding chamber 100 according to some embodiments of the present invention. The shielding chamber 100 may be constructed by using the method 1000 described above. The partial cross section shown in FIG. 11 may be a portion of a cross section taken along AA of FIG. 8. The circumferential wall 4 of the shielding chamber 100 may be composed of a plurality of inner wall prefabricated modules 45 and a plurality of outer wall prefabricated modules 46. As shown in FIG. 11, two adjacent modules, i.e., an inner wall prefabricated module 45 and an outer wall prefabricated module 46 are stacked along a thickness direction of the circumferential wall 4 (e.g., a BB direction shown in FIG. 11), and the two modules may be regarded as a whole wall prefabricated module. The circumferential wall 4 may include a plurality of wall prefabricated modules. The thickness of the inner wall prefabricated module 45 may range from 0.5 meter to 2.5 meters, the thickness of the outer wall prefabricated module 46 may range from 0.5 meter to 2.5 meters, and the thickness of the wall prefabricated module may range from 1 meter to 5 meters.

[0061] Referring to FIG. 11, the inner wall prefabricated module 45 and the outer wall prefabricated module 46 each may include at least two prefabricated molds 10 (e.g., the prefabricated molds 10 described above with reference to FIG. 4) and a building material 80, e.g., a concrete material, located between the at least two prefabricated molds 10. The plurality of inner wall prefabricated modules 45 may constitute the inner circumferential wall, and the plurality of outer wall prefabricated modules 45 may constitute the outer circumferential wall. As shown in FIG. 11, the inner circumferential wall composed of the plurality of inner wall prefabricated modules 45 may be closer to the inner space 253 for installing or placing an accelerator than the outer circumferential wall composed of the plurality of outer wall prefabricated modules 46. The building material 80, e.g., a concrete material, may also be filled between adjacent inner wall prefabricated modules 45 and / or between adjacent outer wall prefabricated modules 46 along a horizontal non-thickness extension direction of the circumferential wall 4 (e.g., a CC direction shown in FIG. 8). The thickness of the filled building material 80 may be substantially consistent with the width of a gap between adjacent (i.e., laterally adjacent) prefabricated molds 10 along the horizontal non-thickness extension direction of the circumferential wall 4, e.g., in a range of 0.5 centimeter to 10 centimeters. By filling the building material 80 between the laterally adjacent prefabricated molds 10, a connection between the laterally adjacent prefabricated molds 10 can be implemented. This not only meets a structural stability requirement of the shielding chamber 100, but also eliminates a need for connecting the laterally adjacent prefabricated molds 10 by using a connecting member (e.g., a screw rod or a screw).

[0062] In addition, at least one wall prefabricated module in the plurality of inner wall prefabricated modules 45 and the plurality of outer wall prefabricated modules 46 may internally include a linear screw rod 47 and an L-shaped screw rod 48. For example, two face-to-face adjacent prefabricated molds 10 and the building material 80 (not shown in FIG. 12) located therebetween may be connected by using the linear screw rod 47 schematically shown in FIG. 12, and one prefabricated mold 10 and the building material 80 (not shown in FIG. 12) adjacent to the prefabricated mold may be connected by using the L-shaped screw rod 48 schematically shown in FIG. 12. In another embodiment, at least one wall prefabricated module in the plurality of inner wall prefabricated modules 45 and the plurality of outer wall prefabricated modules 46 may internally include at least one of a linear screw rod 47 and an L-shaped screw rod 48. The use of the linear screw rod 47 and / or the L-shaped screw rod 48 can enhance structural stability of the circumferential wall 4.

[0063] Similar to the circumferential wall 4 described above, the top wall 6 of the shielding chamber 100 may be composed of a plurality of inner top wall prefabricated modules and a plurality of outer top wall prefabricated modules. Two adjacent modules, i.e., an inner top wall prefabricated module and an outer top wall prefabricated module are stacked along a thickness direction of the top wall 6, and the two modules may be regarded as a whole top wall prefabricated module. The top wall 6 may include a plurality of top wall prefabricated modules. The thickness of the inner top wall prefabricated module may range from 0.5 meter to 2.5 meters, the thickness of the outer top wall prefabricated module may range from 0.5 meter to 2.5 meters, and the thickness of each top wall prefabricated module may range from 1 meter to 5 meters.

[0064] The inner top wall prefabricated module and the outer top wall prefabricated module each may include at least two prefabricated molds 10 (e.g., the prefabricated molds 10 described above with reference to FIG. 4) and a building material 80, e.g., a concrete material, located between the at least two prefabricated molds 10. The plurality of inner top wall prefabricated modules may constitute the inner top wall, and the plurality of outer top wall prefabricated modules may constitute the outer top wall. The inner top wall composed of the plurality of top wall prefabricated modules may be closer to the inner space 253 for installing or placing an accelerator than the outer top wall composed of the plurality of outer top wall prefabricated modules. The building material 80, e.g., a concrete material, may also be filled between adjacent inner top wall prefabricated modules and / or between adjacent outer top wall prefabricated modules along a horizontal non-thickness extension direction of the top wall. The thickness of the filled building material 80 may be substantially consistent with the width of a gap between adjacent prefabricated molds 10 along the horizontal non-thickness extension direction of the top wall, e.g., in a range of 0.5 centimeter to 10 centimeters. In addition, similar to the description with respect to the inner wall prefabricated modules 45 and the outer wall prefabricated modules 46, at least one top wall prefabricated module in the plurality of inner top wall prefabricated modules and the plurality of outer top wall prefabricated modules may internally include a linear screw rod and / or an L-shaped screw rod. The use of the linear screw rod and / or the L-shaped screw rod can enhance structural stability of the circumferential wall 6.

[0065] Compared with constructing a shielding chamber in a conventional masonry wall building manner, in the present invention, during construction of the shielding chamber 100, the prefabricated molds 10 simply need to be assembled on site and a building material is injected into a frame formed by assembling the prefabricated molds 10. This can greatly reduce a construction time, construction difficulty, and construction costs of the shielding chamber. Moreover, the prefabricated molds 10 can be produced as standardized members, and this can allow for standardization or mass construction of shielding chambers. In addition, compared with a shielding chamber formed by direct assembling of relatively thick prefabricated members (whose thickness is usually the same as the thickness of a wall of the shielding chamber and may be up to 2 meters to 5 meters, resulting in a very heavy weight of the prefabricated members), the shielding chamber in the present invention uses the prefabricated molds 10 with a small thickness (for example, the thickness is 5 centimeters to 20 centimeters, making the prefabricated molds 10 lighter in weight, e.g., less than 1 ton). This can avoid a need for a relatively large lifting space at a construction site to lift relatively heavy members. In this way, a site restriction on construction of a shielding chamber can be reduced, thereby allowing a shielding chamber to be constructed in a scenario (e.g., a hospital) with an insufficient lifting space. In a further embodiment of the present invention, the building material injected into a frame (e.g., the circumferential wall frame, the top wall frame, or the side door body frame) during the construction of the shielding chamber may include concrete in a semi-solidified state. When the concrete in the semi-solidified state is injected into the frame formed by assembling the prefabricated molds 10, the concrete in the semi-solidified state may flow to and fill a gap between adjacent prefabricated molds 10. In one aspect, sealing performance of the circumferential wall, the top wall, or the side door body formed can be enhanced, thereby enhancing a radiation shielding effect of the shielding chamber. In another aspect, the thickness of the building material filled into the gap between adjacent prefabricated molds 10 may be substantially equal to the width of the gap. Therefore, a relatively large gap width difference can be allowed between adjacent prefabricated molds 10 assembled (for example, the gap width may range from 0.5 centimeter to 10 centimeters), thereby further reducing construction difficulty of the shielding chamber.

[0066] In a still further embodiment of the present invention, a frame (e.g., the circumferential wall frame, the top wall frame, or the side door body frame) of the shielding chamber may be configured as a multi-layer frame and include at least an inner frame (e.g., the inner circumferential wall frame, the inner top wall frame, or the inner side door body frame) and an outer frame (e.g., the outer circumferential wall frame, the outer top wall frame, or the outer side door body frame). Compared with a single-layer frame, a multi-layer frame may further include at least one inner wall to separate layers. The inner wall may be formed by assembling prefabricated molds 10. The presence of the inner wall can disperse the pressure of the concrete in the semi-solidified state against the outermost and innermost side walls of the frame before solidification, thereby improving structural stability of the shielding chamber.

[0067] In an embodiment in which at least one constituent portion (including the top wall 6, the circumferential wall 4, or the side door 7) of the shielding chamber 100 has a plurality of layers, since each layer of this constituent portion (or these constituent portions) has a different distance from the space for placing an accelerator, it is allowed to perform different waste treatment manners on different layers of the constituent portion of the shielding chamber 100 that is abandoned. For example, a common building waste treatment is performed on the outermost layer or the second outermost layer of constituent portions of the shielding chamber 100, a radioactive waste treatment is performed only on the innermost layer of the constituent portions of the shielding chamber 100, and there is no need to perform the radioactive waste treatment on all the constituent portions of the entire shielding chamber 100, thereby reducing treatment difficulty and treatment costs of shielding chamber waste.

[0068] A method for treating a shielding chamber is described below with reference to FIG. 13 and FIG. 14. This method may be performed after the life of an accelerator ends or after a shielding chamber is abandoned.

[0069] FIG. 13 shows a method 1300 for treating a shielding chamber 100 according to some embodiments of the present invention. The shielding chamber 100 may be the shielding chamber 100 described above with reference to FIG. 10.

[0070] At step 1301, a first treatment for radioactive waste is performed on at least a portion of an inner circumferential wall and at least a portion of an inner top wall. In some embodiments, after the life of the accelerator ends or after the shielding chamber 100 is abandoned, a portion of the inner circumferential wall and a portion of the inner top wall of the shielding chamber 100 may have met a radioactive waste standard. At this time, the treatment for radioactive waste may be performed on the portion of the inner circumferential wall and the portion of the inner top wall that have met the radioactive waste standard.

[0071] At step 1303, a second treatment for common building waste is performed on an outer circumferential wall and an outer top wall. In some embodiments, since the outer circumferential wall and the outer top wall of the shielding chamber 100 are remote from an inner space for placing or installing an accelerator, after the life of the accelerator ends or after the shielding chamber 100 is abandoned, the outer circumferential wall and the outer top wall usually do not meet the radioactive waste standard. Therefore, the treatment for common building waste may be performed on the outer circumferential wall and the outer top wall that do not meet the radioactive waste standard.

[0072] FIG. 14 shows another method 1400 for treating a shielding chamber 100 according to some embodiments of the present invention. The shielding chamber 100 may be the shielding chamber 100 described above with reference to FIG. 11.

[0073] At step 1401, a first treatment for radioactive waste is performed on at least some of a plurality of inner wall prefabricated modules and at least some of a plurality of inner top wall prefabricated modules. In some embodiments, after the life of an accelerator ends or after the shielding chamber 100 is abandoned, some of the plurality of inner wall prefabricated modules and some of the plurality of inner top wall prefabricated modules of the shielding chamber 100 may have met a radioactive waste standard. At this time, the treatment for radioactive waste may be performed on these inner circumferential wall prefabricated modules and these inner top wall prefabricated modules that have met the radioactive waste standard.

[0074] At step 1403, a second treatment for common building waste is performed on a plurality of outer wall prefabricated modules and a plurality of outer top wall prefabricated modules. In some embodiments, since the plurality of outer wall prefabricated modules and the plurality of outer top wall prefabricated modules of the shielding chamber 100 are remote from an inner space for placing or installing an accelerator, after the life of the accelerator ends or after the shielding chamber 100 is abandoned, the outer wall prefabricated modules and the outer top wall prefabricated modules usually do not meet the radioactive waste standard. Therefore, the treatment for common building waste may be performed on the outer circumferential wall and the outer top wall that do not meet the radioactive waste standard.

[0075] The orders of the steps described above with respect to the method 1300 and the method 1400 are exemplary and not intended to constitute a limitation. Those skilled in the art may adjust the orders of these steps as required.

[0076] In addition, in the present invention, when the radiation content of a certain layer (e.g., an inner layer of a shielding chamber that is not maintained or an outer layer of a shielding chamber that has been maintained a plurality of times) of the shielding chamber 100 having a plurality of layers distributed from inside out does not meet the standard, it is possible to separately remove only the inner layer or the outer layer of the shielding chamber 100 and rebuild a corresponding inner layer or outer layer, thereby maintaining the shielding chamber 100 and putting it into use again. This can avoid dismantling the entire shielding chamber whose portion exceeds a radiation content standard and reconstructing a shielding chamber, thereby greatly reducing dismantling and construction costs of the shielding chamber.

[0077] Although the present invention has been described in accordance with preferred embodiments of the present disclosure, the present invention is not limited thereto but subject only to a limitation of the scope set forth in the appended claims. It should be understood by those skilled in the art that various modifications and changes may be made to the embodiments described herein without departing from the broader spirit and scope of the present invention as set forth in the appended claims.

Claims

1. A method for constructing a shielding chamber for an accelerator, <b>characterized by comprising: step a: assembling a plurality of prefabricated molds to form a circumferential wall frame; step b: injecting a building material into the circumferential wall frame to form a circumferential wall of the shielding chamber; step c: assembling a plurality of prefabricated molds to form a top wall frame on the circumferential wall; and step d: injecting a building material into the top wall frame to form a top wall of the shielding chamber, wherein the top wall together with the circumferential wall encloses an inner space for placing the accelerator.

2. The method according to claim 1, wherein the circumferential wall frame comprises an inner circumferential wall frame and an outer circumferential wall frame, the circumferential wall comprises an inner circumferential wall and an outer circumferential wall, the inner circumferential wall is close to the inner space for placing the accelerator, and the outer circumferential wall is remote from the inner space for placing the accelerator; step a further comprises: assembling the plurality of prefabricated molds to form the inner circumferential wall frame and the outer circumferential wall frame; and step b further comprises: injecting the building material into the inner circumferential wall frame to form the inner circumferential wall; and injecting the building material into the outer circumferential wall frame to form the outer circumferential wall.

3. The method according to claim 2, wherein the top wall frame comprises an inner top wall frame and an outer top wall frame, the top wall comprises an inner top wall and an outer top wall, the inner top wall is close to the inner space for placing the accelerator, and the outer top wall is remote from the inner space for placing the accelerator; step c further comprises: assembling the plurality of prefabricated molds to form the inner top wall frame and the outer top wall frame on the circumferential wall; and step d further comprises: injecting the building material into the inner top wall frame to form the inner top wall; and injecting the building material into the outer top wall frame to form the outer top wall.

4. The method according to claim 3, wherein the circumferential wall is configured to have a lateral opening, and the lateral opening communicates with the inner space for the accelerator to enter the inner space from the lateral opening.

5. The method according to claim 4, further comprising: step e: assembling a plurality of prefabricated molds to form a side door body frame; and step f: injecting a building material into the side door body frame to form a side door body of the shielding chamber, wherein the side door body is configured to block the lateral opening of the circumferential wall.

6. The method according to claim 5, wherein the side door body frame comprises an inner side door body frame and an outer side door body frame, the side door body comprises an inner side door body and an outer side door body, and when the side door body blocks the lateral opening of the circumferential wall, the inner side door body is close to the inner space for placing the accelerator, and the outer side door body is remote from the inner space for placing the accelerator; step e further comprises: assembling the plurality of prefabricated molds to form the inner side door body frame and the outer side door body frame; and step f further comprises: injecting the building material into the inner side door body frame to form the inner side door body; and injecting the building material into the outer side door body frame to form the outer side door body.

7. The method according to claim 6, wherein the inner circumferential wall or the outer circumferential wall of the circumferential wall is separately removable; the inner top wall or the outer top wall of the top wall is separately removable; and the inner side door body or the outer side door body of the side door body is separately removable.

8. The method according to any one of claims 1 to 7, wherein the injected building material comprises a concrete material.

9. The method according to any one of claims 1 to 7, wherein each prefabricated mold is connected by means of at least one of a linear screw rod and an L-shaped screw rod to an adjacent building material for forming the circumferential wall or the top wall.

10. The method according to any one of claims 1 to 7, further comprising: building a foundation of the shielding chamber for the circumferential wall frame to be formed thereon, wherein the circumferential wall is connected to the foundation by means of a plurality of bolts.

11. A shielding chamber for an accelerator, <b>characterized by being constructed by using the method according to any one of claims 1 to 3, and comprising: the circumferential wall; and the top wall, wherein the top wall together with the circumferential wall encloses an inner space for placing the accelerator.

12. The shielding chamber according to claim 11, wherein the circumferential wall is configured to have a lateral opening, and the lateral opening communicates with the inner space for the accelerator to enter the inner space from the lateral opening; and the shielding chamber further comprises a side door body, wherein the side door body is configured to block the lateral opening of the circumferential wall.

13. The shielding chamber according to claim 12, wherein the side door body is formed in the following way: assembling a plurality of prefabricated molds to form a side door body frame; and injecting a building material into the side door body frame to form the side door body.

14. The shielding chamber according to claim 13, wherein the side door body frame comprises an inner side door body frame and an outer side door body frame, the side door body comprises an inner side door body and an outer side door body, and when the side door body blocks the lateral opening of the circumferential wall, the inner side door body is close to the inner space for placing the accelerator, and the outer side door body is remote from the inner space for placing the accelerator; and the side door body is further formed in the following way: assembling the plurality of prefabricated molds to form the inner side door body frame and the outer side door body frame; injecting the building material into the inner side door body frame to form the inner side door body; and injecting the building material into the outer side door body frame to form the outer side door body.

15. A shielding chamber for an accelerator, <b>characterized by comprising: a plurality of wall prefabricated modules, wherein the plurality of wall prefabricated modules constitute a circumferential wall; a plurality of top wall prefabricated modules, wherein the plurality of top wall prefabricated modules constitute a top wall, and the top wall together with the circumferential wall encloses an inner space for placing the accelerator; and a building material, wherein the building material is filled between adjacent ones of the plurality of wall prefabricated modules and between adjacent ones of the plurality of top wall prefabricated modules.

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