Radiation protection wall system for X-ray electron accelerator

Abstract

The application provides an anti-radiation wall system of an X-ray electron accelerator for irradiation, which comprises a main machine room, an irradiation room, a lower maze, an upper maze, a control room, a radiation monitoring device, a feeding warehouse, a receiving warehouse and an external supply equipment area. One end of the irradiation accelerator is connected to the irradiation room through a horn output end, the wire bundle enters the upper maze through the irradiation room output end, the wire bundle at the other end of the irradiation accelerator in the main machine room is output to the lower maze through the main machine room, and the irradiation room, the lower maze and the upper maze are all empty when the irradiation accelerator is normally operated. The wire bundle emitted by the irradiation accelerator is effectively refracted and dispersed through the isolation main wall, the lower maze and the upper maze, so that the irradiation accelerator wire bundle is effectively isolated and prevented from leaking, and the overall safety of the maze is improved.

Description

Technical Field

[0001] This invention relates to the field of building protection technology, and more specifically, to a radiation shielding wall system for an X-ray electron accelerator used for irradiation. Background Technology

[0002] In recent years, the demand for irradiation of medical and health materials, pharmaceuticals, and various foods and condiments has increased significantly. Therefore, industrial irradiation rooms are needed for the irradiation sterilization of medical and health materials, pharmaceuticals, and various foods and condiments.

[0003] Currently, most radiation sterilization methods rely on installing protective walls inside the workshop for radiation protection. These protective walls are often made of spliced ​​lead plates, and the seams between them cannot effectively isolate the radiation source, causing damage to personnel and the environment. Furthermore, they cannot effectively monitor the radiation levels.

[0004] In view of this, the present invention provides an effective and simple radiation shielding wall system for an X-ray electron accelerator used for irradiation. Summary of the Invention

[0005] The purpose of this invention is to provide an effective and structurally simple radiation shielding wall system for X-ray electron accelerators used for irradiation.

[0006] A radiation shielding wall system for an X-ray electron accelerator used for irradiation includes a main unit room 1, an irradiation chamber 2, a lower labyrinth 3, an upper labyrinth 4, a control room 5, a radiation monitoring device, a feeding warehouse 6, a receiving warehouse 7, and an external supply equipment area 8. The system is characterized in that: the upper labyrinth 4 and lower labyrinth 3 are sequentially arranged from top to bottom along the sides of the control room 5; the external supply equipment area 8 is located below the main unit room 1; the main unit room 1, irradiation chamber 2, lower labyrinth 3, upper labyrinth 4, and control room 5 are separated by concrete walls 9; the main unit room 1 houses an irradiation accelerator 10, with a flared outlet at the output end of the irradiation accelerator 10; and the irradiation chamber 2 houses an isolation main wall 11. To serve as an insulator and absorb heat, one end of the irradiation accelerator 10 is output to the irradiation chamber 2 through a horn-shaped outlet. The wire harness enters the upper labyrinth 4 through the outlet of the irradiation chamber 2. The other end of the wire harness of the irradiation accelerator 10 in the main unit room 1 is output to the lower labyrinth 3 through the main unit room 1. Radiation monitoring devices are installed in the main unit room 1, irradiation chamber 2, lower labyrinth 3, upper labyrinth 4, and control room 5. The radiation monitoring devices are used to monitor the radiation levels at various points in the main unit room 1, irradiation chamber 2, lower labyrinth 3, upper labyrinth 4, and control room 5. The radiation monitoring devices are electrically connected to the control room 5. The control room 5 is used to control the main unit room 1 and monitor the radiation levels in the main unit room 1, irradiation chamber 2, lower labyrinth 3, and upper labyrinth 4 in real time.

[0007] Furthermore, the isolation wall 11 is equipped with a serpentine water-cooling coil 12, which is used to absorb the heat generated by the irradiation accelerator 10 and cool the isolation wall 11.

[0008] Furthermore, when the radiation monitoring data from the main unit room 1, irradiation room 2, lower maze 3, and upper maze 4 exceeds the radiation setpoint, the control room 5 will issue an alarm signal when there is an anomaly. The alarm signals include a first-level alarm, a second-level alarm, a third-level alarm, and a fourth-level alarm. The first-level alarm means that the operation of the irradiation accelerator 10 will be immediately shut down in the control room 5. After the radiation monitoring devices at each radiation point detect that the radiation level meets the standard, personnel will enter the main unit room 1 to repair the irradiation accelerator 10. The second-level alarm means that the operation of the irradiation accelerator 10 will be immediately shut down in the control room 5. The supply and circulation of cold water in the serpentine water-cooling coil 12 will be increased. The serpentine water-cooling coil 12 will be cooled to the set standard value before it is restarted. The third-level alarm means that the operation of the irradiation accelerator 10 will be immediately shut down in the control room 5, and the operation of the feeding warehouse 6 will be shut down simultaneously. The fourth-level alarm means that the operation of the irradiation accelerator 10 will be immediately shut down in the control room 5, the operation of the feeding warehouse 6 will be shut down, and personnel will be ordered to evacuate.

[0009] In some embodiments, the isolation main wall 11 is provided with tangents 13 at both ends near the horn mouth side to provide refraction for the radiation beam output by the irradiation accelerator 10. The tangent 13 at the right end forms a triangular refraction area 14 with the concrete wall 9 on the right side of the irradiation chamber 2, so that the radiation beam output by the irradiation accelerator 10 remains in the triangular refraction area 14 after hitting the tangent 13 at the right end until it attenuates and disappears.

[0010] Furthermore, the chamfer angle 13 is 45°.

[0011] In some implementations, the vertical centerline of the isolation wall 11 is located at one-third of the way up from the bottom of the irradiation chamber 2.

[0012] In some embodiments, a baffle wall 15 is provided at the concrete wall 9 where the upper maze 4 connects to the irradiation chamber 2, and at the wall connecting the upper maze 4 to the feeding warehouse 6 and the receiving warehouse 7. The baffle wall 15 is used to secondary shield the wire bundle particles and refract them back into the upper maze 4.

[0013] In some embodiments, the upper maze 4 is an L-shaped maze.

[0014] In some embodiments, the retaining wall 15 is made of either concrete or brick, with concrete being the more preferred material.

[0015] In some embodiments, the isolation main wall 11 is provided with protrusions 16 at both ends of the side away from the irradiation accelerator 10, and the protrusions 16 are used to provide a refractive part for the beam particles.

[0016] The beneficial effects of this invention: This invention proposes a radiation shielding wall system for an X-ray electron accelerator used for irradiation, including a main unit room 1, an irradiation room 2, a lower labyrinth 3, an upper labyrinth 4, a control room 5, a radiation monitoring device, a feeding warehouse 6, a receiving warehouse 7, and an external supply equipment area 8. One end of the irradiation accelerator 10 is output into the irradiation room 2 through a horn-shaped outlet, and the beam enters the upper labyrinth 4 through the output end of the irradiation room 2. The other end of the beam from the irradiation accelerator 10 in the main unit room 1 is output to the lower labyrinth 3 through the main unit room 1. When the irradiation accelerator 10 is operating normally, there are no people in the irradiation room 2, the lower labyrinth 3, and the upper labyrinth 4. The beam emitted by the irradiation accelerator 10 is effectively refracted and dispersed through the isolation main wall 11, the lower labyrinth 3, and the upper labyrinth 4, effectively isolating and preventing the beam from leaking out, thus improving the overall safety of the labyrinth. Attached Figure Description

[0017] Figure 1 This is a top view schematic diagram of a radiation shielding wall system for an X-ray electron accelerator used for irradiation, according to this application.

[0018] Figure 2 This is a top-view, partially enlarged schematic diagram of a radiation shielding wall system for an X-ray electron accelerator used in irradiation, according to this application.

[0019] Figure 3 This is a schematic diagram of the beam particle scattering path of a radiation shielding wall system for an X-ray electron accelerator used in irradiation, as described in this application.

[0020] Figure 4 This is a partially enlarged schematic diagram of the beam particle scattering path of a radiation shielding wall system for an X-ray electron accelerator used in irradiation, according to this application.

[0021] Figure 5 This is a cross-sectional view of a radiation shielding wall system for an X-ray electron accelerator used for irradiation, as described in this application.

[0022] Explanation of key component symbols:

[0023] 1. Main unit room; 2. Irradiation room; 3. Lower labyrinth; 4. Upper labyrinth; 5. Control room; 6. Feeding warehouse; 7. Receiving warehouse; 8. External supply equipment area; 9. Concrete wall; 10. Irradiation accelerator; 11. Isolation main wall; 12. Serpentine water cooling coil; 13. Chamfer; 14. Triangular refraction area; 15. Retaining wall; 16. Protrusion.

[0024] The following detailed description, in conjunction with the accompanying drawings, will further illustrate the present invention. Detailed Implementation

[0025] The following embodiments are described to aid in understanding this application. These embodiments are not, and should not be, construed in any way as limiting the scope of protection of this application.

[0026] In the following description, those skilled in the art will recognize that throughout this discussion, components may be described as individual functional units (which may include subunits), but those skilled in the art will recognize that various components or portions thereof may be divided into individual components or may be integrated together (including integrated within a single system or component).

[0027] Furthermore, the connection between components or systems is not intended to be limited to a direct connection; on the contrary, data between these components may be modified, reformatted, or otherwise altered by intermediate components. Additionally, other or fewer connections may be used. It should also be noted that the terms "connection," "link," or "input" should be understood to include direct connections, indirect connections via one or more intermediate devices, and wireless connections.

[0028] Example 1:

[0029] like Figure 1 The image shown is a top view schematic diagram of a radiation shielding wall system for an X-ray electron accelerator used in irradiation, according to this application; as shown... Figure 2 The image shown is a partially enlarged top view schematic diagram of a radiation shielding wall system for an X-ray electron accelerator used in irradiation, according to this application; as shown... Figure 3 The diagram shown is a schematic representation of the beam particle scattering path of a radiation shielding wall system for an X-ray electron accelerator used in irradiation, according to this application. Figure 4 The image shown is a partially enlarged schematic diagram of the beam particle scattering path of a radiation shielding wall system for an X-ray electron accelerator used in irradiation, according to this application; Figure 5 The image shown is a cross-sectional view of a radiation shielding wall system for an X-ray electron accelerator used for irradiation, according to this application.

[0030] A radiation shielding wall system for an X-ray electron accelerator used for irradiation includes a main unit room 1, an irradiation chamber 2, a lower labyrinth 3, an upper labyrinth 4, a control room 5, a radiation monitoring device, a feeding warehouse 6, a receiving warehouse 7, and an external supply equipment area 8. The system is characterized in that: the upper labyrinth 4 and lower labyrinth 3 are sequentially arranged from top to bottom along the sides of the control room 5; the external supply equipment area 8 is located below the main unit room 1; the main unit room 1, irradiation chamber 2, lower labyrinth 3, upper labyrinth 4, and control room 5 are separated by concrete walls 9; the main unit room 1 houses an irradiation accelerator 10, with a flared outlet at the output end of the irradiation accelerator 10; and the irradiation chamber 2 houses an isolation main wall 11. To serve as an insulator and absorb heat, one end of the irradiation accelerator 10 is output to the irradiation chamber 2 through a horn-shaped outlet. The wire harness enters the upper labyrinth 4 through the outlet of the irradiation chamber 2. The other end of the wire harness of the irradiation accelerator 10 in the main unit room 1 is output to the lower labyrinth 3 through the main unit room 1. Radiation monitoring devices are installed in the main unit room 1, irradiation chamber 2, lower labyrinth 3, upper labyrinth 4, and control room 5. The radiation monitoring devices are used to monitor the radiation levels at various points in the main unit room 1, irradiation chamber 2, lower labyrinth 3, upper labyrinth 4, and control room 5. The radiation monitoring devices are electrically connected to the control room 5. The control room 5 is used to control the main unit room 1 and monitor the radiation levels in the main unit room 1, irradiation chamber 2, lower labyrinth 3, and upper labyrinth 4 in real time.

[0031] Furthermore, the isolation wall 11 is equipped with a serpentine water-cooling coil 12, which is used to absorb the heat generated by the irradiation accelerator 10 and cool the isolation wall 11.

[0032] When the radiation monitoring data from the main unit room 1, irradiation room 2, lower maze 3, and upper maze 4 exceeds the radiation setpoint, the control room 5 will issue an alarm signal. The alarm signals include Level 1, Level 2, Level 3, and Level 4 alarms. Level 1 alarm means that the operation of the irradiation accelerator 10 will be immediately shut down in the control room 5. After the radiation monitoring devices at each radiation point detect that the radiation level meets the standard, personnel will enter the main unit room 1 to repair the irradiation accelerator 10. Level 2 alarm means that the operation of the irradiation accelerator 10 will be immediately shut down in the control room 5. The supply and circulation of cold water in the serpentine water-cooling coil 12 will be increased. The serpentine water-cooling coil 12 will be cooled to the set standard value before resuming operation. Level 3 alarm means that the operation of the irradiation accelerator 10 will be immediately shut down in the control room 5, and the operation of the feeding warehouse 6 will be simultaneously shut down. Level 4 alarm means that the operation of the irradiation accelerator 10 will be immediately shut down in the control room 5, and the operation of the feeding warehouse 6 will be shut down. At the same time, personnel will be notified to evacuate.

[0033] The isolation wall 11 has tangents 13 at both ends near the horn opening to refract the radiation beam output by the irradiation accelerator 10. The tangent 13 at the right end forms a triangular refraction area 14 with the concrete wall 9 on the right side of the irradiation chamber 2, so that the radiation beam output by the irradiation accelerator 10 remains in the triangular refraction area 14 after hitting the tangent 13 at the right end until it attenuates and disappears.

[0034] The chamfer angle 13 is 45°.

[0035] The vertical centerline of the isolation wall 11 is located at one-third of the way up from the bottom of the irradiation chamber 2.

[0036] The concrete wall 9 at the thickness connection between the upper maze 4 and the irradiation chamber 2, and the wall connecting the upper maze 4 with the feeding warehouse 6 and the receiving warehouse 7 are all equipped with a barrier wall 15. The barrier wall 15 is used to secondary shield the wire bundle particles and refract them back into the upper maze 4.

[0037] The upper maze 4 is an L-shaped maze.

[0038] The retaining wall 15 is made of either concrete or brick, with concrete being the preferred material.

[0039] The isolation main wall 11 is provided with protrusions 16 at both ends of the side away from the irradiation accelerator 10. The protrusions 16 are used to provide a refraction part for the beam particles.

[0040] Table 1 below shows the detection of radiation points in this application:

[0041]

[0042] Among them, the radiation monitoring devices at both ends of the irradiation accelerator 10 are level one alarm points, the isolation main wall 11 near the horn is a level two alarm point, the inner wall of the main unit room 1 and B1, B6 and B7 corresponding to the irradiation room are level three alarm points, and B3 of the receiving warehouse 7 and C3 and B2 of the control room are level four alarm points.

[0043] The control room receives data from the radiation monitoring devices at each location and performs Level 1 checks accordingly.

[0044] Inside irradiation chamber 2, the electron beam from the output end of irradiation accelerator 10 points north and strikes the tantalum target inside the scanning window, generating high-energy X-rays. Therefore, the radiation influence of the shielding body on the north side of irradiation chamber 2 is mainly considered to be X-rays along the incident direction of the electron beam (0°), and X-rays at 90° to the incident direction of the electron beam in other directions. Since the bottom of irradiation chamber 2 is a soil layer with no buildings, no analysis or prediction is made.

[0045] The dose outside the shielding wall can be predicted using the following formula:

[0046]

[0047] In the formula:

[0048] Where: HM—dose equivalent rate around the reference point, μSv / h;

[0049] BX—X-ray shielding transmittance; T—residence factor;

[0050] d—Distance between the X-ray source and the reference point, in meters;

[0051] D10—Absorbed dose rate at a standard reference point 1 m away from the X-ray radiation source, Gy / h. D10 = 60.QIfe……(11-2)

[0052] Where: Q—X-ray emissivity, Gy·m2·mA-1·min-1; I—electron beam intensity, mA;

[0053] fe—X-ray emissivity correction factor

[0054] B x =10 一n ……(11-3)

[0055]

[0056] Where: S—thickness of the shield, cm;

[0057] T1—The first tenth of the shielding thickness facing the radiation source, in cm; Te—The equilibrium tenth of the thickness, which is approximately constant, in cm;

[0058] n — the number of tenths of the value layers.

[0059] Table 2 below is a summary of the calculation parameters for the shielding of irradiation chamber 2:

[0060]

[0061]

[0062] Table 3 below shows the calculation results of the radiation level around the irradiation chamber:

[0063] Table 4 below shows the calculation results of the radiation level around the irradiation chamber:

[0064]

[0065]

[0066] As shown in Tables 3 and 4, the maximum radiation dose rate at the area accessible to personnel outside the shielding walls of irradiation chamber 2 is 0.068 μSv / h, and the radiation dose equivalent rate at the top 30 cm is 0.322 μSv / h. This meets the dose limit requirement of the reference standard "Radiation Safety and Protection of Electron Accelerator Irradiation Devices" (HJ979-2018), which states that "the dose equivalent rate at the area 30 cm from the outer surface of the shielding of the area accessible to personnel outside the electron accelerator irradiation device and beyond shall not exceed 2.5 μSv / h".

[0067] Although this application discloses several aspects and embodiments, other aspects and embodiments will be obvious to those skilled in the art. Various modifications and improvements can be made without departing from the concept of this application, and these all fall within the scope of protection of this application. The various aspects and embodiments disclosed in this application are for illustrative purposes only and are not intended to limit this application. The actual scope of protection of this application is determined by the claims.

Claims

1. A radiation shielding wall system for an X-ray electron accelerator used for irradiation, comprising a main unit room (1), an irradiation chamber (2), a lower labyrinth (3), an upper labyrinth (4), a control room (5), a radiation monitoring device, a feeding warehouse (6), a receiving warehouse (7), and an external supply equipment area (8), characterized in that: The control room (5) has an upper maze (4) and a lower maze (3) arranged from top to bottom on its side. The main unit room (1) has an external supply equipment area (8) below it. The main unit room (1), irradiation room (2), lower maze (3), upper maze (4) and control room (5) are separated by concrete walls (9). The main unit room (1) is equipped with an irradiation accelerator (10). The output end of the irradiation accelerator (10) is equipped with a horn. The irradiation room (2) is equipped with an isolation main wall (11). The isolation main wall (11) serves to isolate and absorb heat. One end of the irradiation accelerator (10) is output to the irradiation room (2) through the horn. The wire harness is output through the irradiation room (2). The other end of the irradiation accelerator (10) in the main unit room (1) is output to the lower maze (3) through the main unit room (1). Radiation monitoring devices are provided in the main unit room (1), irradiation room (2), lower maze (3), upper maze (4) and control room (5). The radiation monitoring devices are used to monitor the radiation amount at each point in the main unit room (1), irradiation room (2), lower maze (3), upper maze (4) and control room (5). The radiation monitoring devices are electrically connected to the control room (5). The control room (5) is used to control the main unit room (1) and monitor the radiation amount in the main unit room (1), irradiation room (2), lower maze (3) and upper maze (4) in real time.

2. The radiation shielding wall system for an X-ray electron accelerator for irradiation as described in claim 1, characterized in that: The isolation wall (11) is equipped with a serpentine water-cooling coil (12) to absorb the heat generated by the irradiation accelerator (10) and cool the isolation wall (11).

3. The radiation shielding wall system for an X-ray electron accelerator for irradiation as described in claim 2, characterized in that: When the radiation monitoring data of the main unit room (1), irradiation room (2), lower maze (3), and upper maze (4) exceeds the radiation set value, the control room (5) issues an alarm signal. The alarm signals include a first-level alarm, a second-level alarm, a third-level alarm, and a fourth-level alarm. The first-level alarm means that the operation of the irradiation accelerator (10) is immediately cut off in the control room (5). After the radiation monitoring devices at each radiation point detect that the radiation level meets the standard, personnel enter the main unit room (1) to perform maintenance on the irradiation accelerator (10). The second-level alarm means that the control room (5) immediately cuts off the operation of the irradiation accelerator (10). The operation of the irradiation accelerator (10) in the control room (5) is immediately cut off, and the supply and circulation of cold water in the serpentine water cooling coil (12) are increased so that the serpentine water cooling coil (12) is cooled to the set standard value before the irradiation accelerator (10) is run again. The third-level alarm is to immediately cut off the operation of the irradiation accelerator (10) in the control room (5) and simultaneously cut off the operation of the feeding warehouse (6). The fourth-level alarm is to immediately cut off the operation of the irradiation accelerator (10) in the control room (5) and cut off the operation of the feeding warehouse (6), and at the same time announce the evacuation of personnel.

4. The radiation shielding wall system for an X-ray electron accelerator for irradiation as described in claim 1, characterized in that: The isolation wall (11) has tangents (13) on both the left and right ends near the horn mouth side to provide refraction for the radiation beam output by the irradiation accelerator (10). The tangent (13) on the right end forms a triangular refraction area (14) with the concrete wall (9) on the right side of the irradiation chamber (2), so that the radiation beam output by the irradiation accelerator (10) will always be in the triangular refraction area (14) after hitting the tangent (13) on the right end until it attenuates and disappears.

5. The radiation shielding wall system for an X-ray electron accelerator for irradiation as described in claim 4, characterized in that: The chamfer (13) is 45°.

6. The radiation shielding wall system for an X-ray electron accelerator for irradiation as described in claim 1, characterized in that: The vertical centerline of the isolation wall (11) is one-third of the way up from the bottom of the irradiation chamber (2).

7. The radiation shielding wall system for an X-ray electron accelerator for irradiation as described in claim 1, characterized in that: The concrete wall (9) at the connection between the upper maze (4) and the irradiation chamber (2), and the wall at the connection between the upper maze (4) and the feeding warehouse (6) and the receiving warehouse (7) are all equipped with a barrier wall (15). The barrier wall (15) is used to block the wire bundle particles for a second time and refract them back into the upper maze (4).

8. The radiation shielding wall system for an X-ray electron accelerator for irradiation as described in claim 1, characterized in that: The upper maze (4) is an L-shaped maze.

9. The radiation shielding wall system for an X-ray electron accelerator for irradiation as described in claim 7, characterized in that: The retaining wall (15) is made of either concrete or brick.

10. The radiation shielding wall system for an X-ray electron accelerator for irradiation as described in claim 1, characterized in that: The isolation wall (11) is provided with protrusions (16) on both the left and right ends of the side away from the irradiation accelerator (10). The protrusions (16) are used to provide a refraction part for the beam particles.

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