Miniaturized self-shielding irradiation system and working method thereof

Abstract

The invention relates to the technical field of electron beam irradiation, and provides a miniaturized self-shielding irradiation system and a working method thereof.The miniaturized self-shielding irradiation system comprises an accelerating tube, a scanning box and an irradiation chamber which are arranged from top to bottom and further comprises a scanning magnet, a lead shell, a waveguide window arranged on one side of the accelerating tube and an irradiation water box arranged in the irradiation chamber; wherein the accelerating tube, the scanning magnet, the scanning box, the irradiation chamber, the waveguide window and the titanium pump are all arranged in the lead shell; the waveguide window is used for feeding the radio frequency microwaves transmitted by the waveguide into the accelerating tube; the accelerating tube is used for acting standing waves formed by the radio frequency microwaves on the electrons and accelerating the electrons; the scanning magnet is annular, sleeves the outer side of the scanning box and is used for generating alternately changing magnetic fields to enable electrons to deflect so as to form fan-shaped electron beams; and the scanning box is used for providing a vacuum space required by the fan-shaped electron beam, so that the fan-shaped electron beam performs irradiation treatment on the sewage in the irradiation water box. Therefore, the environmental radiation dose meets or even is superior to the requirement of the radiation protection standard, and the uniformity of the radiation dose of the under-beam irradiation area is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of electron beam irradiation, and particularly to a miniaturized self-shielding irradiation system and its working method. Background Art

[0002] The statements in this section merely provide background art related to the present invention and do not necessarily constitute prior art.

[0003] Existing sewage irradiation systems have the following disadvantages:

[0004] (1) For existing irradiation systems, it is difficult to meet the requirements of radiation protection standards for the environmental radiation dose during irradiation in the irradiation area.

[0005] (2) For existing irradiation systems, it is difficult to ensure the uniformity of the beam current of the electron beam, and it is impossible to guarantee the uniformity of the irradiation dose in the irradiation area under the beam.

[0006] (3) They are large in volume and occupy a large area, cannot be used for irradiation processing in various scenarios, and cannot be transported. Summary of the Invention

[0007] To solve the deficiencies of the prior art, the present invention provides a miniaturized self-shielding irradiation system and its working method. During irradiation, a closed space is formed by a self-shielding structure in the irradiation area, so that the environmental radiation dose meets or even exceeds the requirements of radiation protection standards, and the uniformity of the irradiation dose in the irradiation area under the beam is increased.

[0008] To achieve the above object, the present invention adopts the following technical solutions:

[0009] The first aspect of the present invention provides a miniaturized self-shielding irradiation system.

[0010] A miniaturized self-shielding irradiation system includes an accelerating tube, a scanning box, and an irradiation chamber arranged from top to bottom, and also includes a scanning magnet, a lead housing, a waveguide window arranged on one side of the accelerating tube, and an irradiation water box arranged in the irradiation chamber; wherein, the accelerating tube, the scanning magnet, the scanning box, the irradiation chamber, the waveguide window, and the titanium pump are all arranged in the lead housing;

[0011] The waveguide window is used to feed the radio frequency microwave transmitted by the waveguide into the accelerating tube;

[0012] The accelerating tube is used to act on electrons with the standing wave formed by the radio frequency microwave to accelerate the electrons;

[0013] The scanning magnet is annular and sleeved outside the scanning box, and is used to generate an alternating magnetic field to deflect electrons to form a fan-shaped electron beam;

[0014] The scanning box is used to provide the vacuum space required for the fan-shaped electron beam, allowing the fan-shaped electron beam to irradiate the sewage in the irradiation water box.

[0015] Furthermore, it also includes a titanium pump arranged on one side of the scanning box;

[0016] The titanium pump is used to maintain the vacuum inside the accelerating tube and the scanning box.

[0017] Furthermore, it also includes a ceramic bellows assembly for connecting the accelerating tube and the scanning box. The ceramic section of the ceramic bellows assembly is used to detect the beam current through a current transformer.

[0018] Furthermore, the waveguide is sequentially connected to a magnetron, a pulse transformer, and a pulse modulator;

[0019] After the pulse generated by the pulse modulator is provided to the magnetron through the pulse transformer, the magnetron generates radio frequency microwaves.

[0020] Furthermore, the pulse generated by the electron gun power supply in the pulse modulator is provided to the electron gun of the accelerating tube through an electron gun pre-transformer, pulling electrons out from the cathode heated by the filament of the electron gun.

[0021] Furthermore, it also includes a sewage transfer system connected to the irradiation water box;

[0022] The sewage transfer system is used to send sewage into and out of the irradiation water box.

[0023] Furthermore, it also includes a container, and both the sewage transfer system and the lead housing are arranged inside the container.

[0024] Furthermore, the speed at which the sewage enters the irradiation water box is adjusted according to the irradiation dose of the fan-shaped electron beam.

[0025] Furthermore, the inlet and outlet pipes of the irradiation water box are embedded in the lead housing.

[0026] The second aspect of the present invention provides a working method for a miniaturized self-shielded irradiation system as described in the first aspect, including the following steps:

[0027] The waveguide window feeds the radio frequency microwaves transmitted by the waveguide into the accelerating tube;

[0028] The accelerating tube acts on electrons with the standing wave formed by the radio frequency microwaves to accelerate the electrons;

[0029] The scanning magnet generates an alternating magnetic field to deflect the electrons, forming a fan-shaped electron beam;

[0030] The scanning box provides the vacuum space required for the fan-shaped electron beam, allowing the fan-shaped electron beam to irradiate the sewage in the irradiation water box.

[0031] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0032] 1. For the miniaturized self-shielded irradiation system of the present invention, during irradiation, the irradiation area forms a closed space by the self-shielding structure, enabling the environmental radiation dose to meet or even exceed the requirements of radiation protection standards, thus ensuring the safety of the staff.

[0033] 2. For the miniaturized self-shielded irradiation system of the present invention, it adopts an annular scanning magnet, which is sleeved outside the scanning box, improving the scanning and beam current uniformity, and making the beam current non-uniformity after scanning less than ±5%.

[0034] 3. For the miniaturized self-shielded irradiation system of the present invention, from the core components such as the accelerating tube and the scanning box to the irradiation head, it adopts a miniaturized design. Together with the sewage transfer system, etc., it is integrated into a container. Its miniaturized and compact structure is particularly suitable for irradiation processing in various scenarios, facilitating transportation and use. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The accompanying drawings forming a part of this specification are used to provide a further understanding of the present invention. The schematic embodiments and descriptions of the present invention are used to explain the present invention and do not constitute an improper limitation of the present invention.

[0036] Figure 1 Internal structure diagram of the miniaturized self-shielded irradiation system according to Embodiment 1 of the present invention;

[0037] Figure 2 External view of the miniaturized self-shielded irradiation system according to Embodiment 1 of the present invention;

[0038] Figure 3 Schematic diagram of the internal structure of the shielding body according to Embodiment 1 of the present invention;

[0039] Figure 4 Working schematic diagram of the scanning magnet according to Embodiment 1 of the present invention;

[0040] Figure 5 Partial structure connection diagram of the miniaturized self-shielded irradiation system according to Embodiment 1 of the present invention;

[0041] Figure 6 Top view of the miniaturized self-shielded irradiation system according to Embodiment 1 of the present invention;

[0042] Figure 7 Schematic diagram of the safety interlock device according to Embodiment 1 of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0043] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0044] It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which the present invention belongs.

[0045] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments of the present invention. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0046] In the present invention, terms such as "upper", "lower", "left", "right", "front", "rear", "vertical", "horizontal", "side", "bottom", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only relationship terms determined for the convenience of describing the structural relationship of each component or element of the present invention and do not specifically refer to any component or element of the present invention. It should not be construed as a limitation to the present invention.

[0047] In the present invention, terms such as "fixed connection", "connected", "connected" should be understood in a broad sense, which may mean a fixed connection, an integral connection or a detachable connection; it may be directly connected or indirectly connected through an intermediate medium. For those related scientific research or technical personnel in the field, the specific meaning of the above terms in the present invention can be determined according to specific circumstances and should not be construed as a limitation to the present invention.

[0048] Without conflict, the embodiments in the present invention and the features in the embodiments can be combined with each other.

[0049] Embodiment 1

[0050] Embodiment 1 of the present invention provides a miniaturized self-shielding irradiation system.

[0051] A miniaturized self-shielding irradiation system provided in this embodiment, as Figure 1 and Figure 2 shown, includes a container machine 1 and a shielding body 2, a water inlet tank 3, a water return tank 4, a water cooling unit 5, a microwave head 6, a main control cabinet 7, an accelerator modulator (also known as a pulse modulator) 8, and an air conditioner 9 provided inside it.

[0052] As Figure 1 , Figure 5 , Figure 6 and Figure 7As shown in the figure, the shielding body 2 is set at the exact center of the shielding body 2. The water inlet tank 3, the water return tank 4, the water-cooling unit 5, and the microwave head 6 are set on the left side of the shielding body 2; the main control cabinet 7, the accelerator modulator 8, and the air conditioner 9 are set on the right side of the shielding body 2. The water return tank 4 and the water-cooling unit 5 are arranged side by side on the upper part of the water inlet tank 3; the microwave head 6 is set between the water return tank 4 and the shielding body 2, and the microwave head 6 and the water return tank 4 are close to the rear side of the shielding body 2, while the water-cooling unit 5 is close to the front side of the shielding body 2. The main control cabinet 7 is close to the front side of the shielding body 2, the air conditioner 9 is close to the rear side of the shielding body 2, and the accelerator modulator 8 is set between the main control cabinet 7 and the air conditioner 9.

[0053] Among them, the water-cooling unit 5 is connected to the accelerator modulator 8 and is used to cool the accelerator modulator 8.

[0054] The shielding body 2 is the most core part of the entire miniaturized self-shielded irradiation system. As Figure 3 shown, the shielding body includes a lead housing 201 and an electron gun 202, an accelerating tube 203, a ceramic bellows assembly 204, a waveguide window 205, a waveguide 206, a scanning magnet 207, a titanium pump 208, a scanning box 209, an irradiation chamber 210, and an irradiation water box 211 arranged inside the lead housing 201.

[0055] The lead housing 201 is made of lead as the material, and the thicknesses of different parts of the lead housing are different, which are specifically determined according to the radiation amounts of different parts. As Figure 3 shown, the part filled with slashes is the lead housing 201.

[0056] The electron gun 202, the accelerating tube 203, the ceramic bellows assembly 204, the scanning box 209, and the irradiation water box 211 are arranged in sequence from top to bottom, and their central axes are on the same straight line. The irradiation water box 211 is arranged inside the irradiation chamber 210.

[0057] As Figure 4 shown, the scanning magnet 207 is annular and sleeved outside the scanning box 209.

[0058] Among them, the waveguide 206 is a device for transmitting microwave power. A waveguide window 205 is added at the connection between the waveguide 206 and the accelerating tube 203. The waveguide window can ensure that microwave (radio frequency microwave) power is fed into the accelerating tube while isolating the inside of the accelerating tube 203 from the waveguide 206.

[0059] Among them, the electron gun: a two-stage thermionic cathode gun, is a device for generating electrons. When the gun high voltage is applied, the electrons are accelerated and injected into the accelerating tube.

[0060] Among them, the accelerating tube 202 is a series of resonant cavities for accelerating electrons. After microwave power is fed into the accelerating tube, an alternating accelerating electric field is established to enable the electrons to obtain continuous acceleration.

[0061] Among them, the titanium pump 208 is arranged on one side of the scanning box 209 and is used to maintain the vacuum inside the accelerating tube 203 and the scanning box 209.

[0062] Among them, under the control of a triangular wave current, the scanning magnet 207 generates an alternating magnetic field, causing the electrons to deflect and form a fan-shaped electron beam.

[0063] Among them, the scanning box 209 is used to provide the vacuum space required for the formation of the fan-shaped electron beam. The titanium window with a thickness of 50 microns ensures the vacuum while allowing electrons to pass through smoothly.

[0064] Among them, the ceramic corrugated pipe assembly 204 is a component connecting the accelerating tube 203 and the scanning box 209. The ceramic section can detect the beam current through a current transformer.

[0065] The microwave head 6 includes: a pulse transformer, a magnetron, and an electron gun pre-transformer; the magnetron is connected to the waveguide 206, and the electron gun pre-transformer is connected to the electron gun 202. Both the waveguide 206 and the electron gun 202 are connected to the accelerating tube 203.

[0066] The high-voltage pulse generated by the pulse modulator is provided to the magnetron through a pulse transformer. The radio frequency microwave generated by the magnetron is fed into the accelerating tube 203 through the microwave transmission system (waveguide 206), and a forward wave and a backward wave are formed in the accelerating tube 203, and the two are superimposed to form a standing wave.

[0067] The high-voltage pulse generated by the electron gun power supply in the pulse modulator is used to provide a high-voltage pulse to the electron gun 202 through the electron gun pre-transformer. The high-voltage pulse pulls the electrons out from the cathode heated by the filament of the electron gun 202 and accelerates the electrons into the accelerating cavity of the accelerating tube 203.

[0068] In the accelerating tube 203, the electrons interact with the axial standing wave electric field in the accelerating cavity and absorb energy from it, continuously accelerating; after passing through the accelerating tube 203, the electrons enter the scanning box 209, and under the action of the scanning magnetic field generated by the scanning magnet 207, they form a fan-shaped beam, pass through the titanium film and hit the water film, and irradiate the sewage in the irradiation water box 211 in the irradiation chamber.

[0069] In this embodiment, the scanning box 209 is a scanning box with an in-built ion pump. By directly integrating the vacuum system on the scanning box 209, the flow resistance loss of the vacuum system can be reduced, with high efficiency, large pumping speed, small volume, regular shape, and easy radiation protection shielding.

[0070] In this embodiment, the scanning magnet 207 is annular and sleeved outside the scanning box 209, improving the scanning and beam uniformity, and making the beam non-uniformity after scanning less than ±5%. The wire coil of the scanning magnet 207 is an inductive load, and the voltage waveform of the wire coil power supply is a square wave, from which the current waveform of the scanning magnet wire coil and the magnetic field distribution of the scanning magnet can be obtained, further improving the scanning uniformity ≤±5%.

[0071] In this embodiment, in order to meet the miniaturization requirements of the container shelter structure, the accelerating tube 203 adopts an S-band standing wave structure linear electron accelerator; the magnetron adopts a high-power magnetron as the power source, which can output an electron beam with an energy of 1 - 3 MeV and an average power of 2 kW; through the optimized design of the structure, the overall size can be controlled within a smaller range.

[0072] In this embodiment, when the accelerating tube 203 is not powered on, it will not generate any radioactivity. The energy of the accelerating tube 203 is 1 - 3 MeV, which is at a very safe level and will not leave any radioactivity residue, ensuring the radiation safety of the irradiated items.

[0073] Among them, the energy of the accelerating tube 203 is measured by the depth dose distribution of the electron beam in the aluminum plate material, and the current is measured by the water tank in the irradiation water box 211. After testing, the electron beam energy is 3.01 MeV, and the average beam current of the output electron beam is 650 μA, that is, the current output power is 2.02 kW.

[0074] In this embodiment, the channel width of the lead housing 201 is 400 - 700 mm, and the space height is only 100 - 600 mm. The waveguide 206, connecting pipes, ventilation pipes, etc. are buried into the lead housing 201 by means of embedded pipes.

[0075] In this embodiment, the water inlet of the water inlet tank 3 is connected to the water inlet pipe. The water inlet pipe passes through the container and is connected to the external pretreatment chamber. The sewage left in the pretreatment chamber enters the water inlet tank 3 through the water inlet pipe. The water outlet of the water inlet tank 3 is connected to the water inlet of the irradiation water box 211 through the first pipe. The water outlet of the irradiation water box 211 is connected to the water inlet of the water return tank 4 through the second pipe. The water outlet of the water return tank 4 is connected to the water outlet pipe. The water inlet pipe passes through the container and is connected to the external post-treatment chamber. The sewage in the water inlet tank 3 enters the irradiation water box 211 through the first pipe, and after being irradiated by the fan-shaped beam, the irradiated water enters the water return tank 4 through the second pipe. The water at the water outlet of the water return tank 4 enters the post-treatment chamber through the water outlet pipe for further treatment.

[0076] Among them, the first pipe and the second pipe are the connecting pipes buried in the lead housing 201.

[0077] In this embodiment, a return water pipeline is provided between the water inlet tank 3 and the water return tank 4. The water in the water return tank 4 can flow back into the water inlet tank 3 through the return pipeline for secondary irradiation treatment.

[0078] The water inlet tank 3, the water return tank 4, the return water pipeline, the first pipeline and the second pipeline constitute a sewage transfer system.

[0079] To ensure safe operation, a miniaturized self-shielded irradiation system provided in this embodiment further includes a safety chain lock device, such as Figure 7 shown, mainly including:

[0080] (1) A key switch equipped in the main control cabinet controls the operation of the microwave head 6, the electron gun 202 or the accelerating tube 203; when the key switch is in an open state, the microwave head 6, the electron gun 202 or the accelerating tube 203 cannot be started; the key is kept by a dedicated person to ensure that others cannot randomly start the equipment;

[0081] (2) The door of the container is provided with a door limit and is high-voltage interlocked with the microwave head 6, the electron gun 202 or the accelerating tube 203. When the door of the container is opened, the microwave head 6, the electron gun 202 or the accelerating tube 203 cannot be started. If the door is opened during the operation of the microwave head 6, the electron gun 202 or the accelerating tube 203, the microwave head 6, the electron gun 202 or the accelerating tube 203 should automatically stop running;

[0082] (3) Emergency stop buttons are designed on both the inner surface of the main control cabinet and the outer surface of the container. When an emergency occurs, the emergency stop button is triggered, and the microwave head 6, the electron gun 202 or the accelerating tube 203 immediately stops emitting beams;

[0083] (4) The microwave head 6, the electron gun 202 or the accelerating tube 203 is interlocked with the beam-down device (such as the scanning magnet 207, the titanium pump 208, the scanning box 209, the irradiation chamber 210 and the irradiation water box 211, etc.). When the beam-down device deviates from the normal operating state or stops running due to a fault, the microwave head 6, the electron gun 202 or the accelerating tube 203 should automatically stop running;

[0084] (5) Working status indicator lights and buzzers are designed on the top of the container. The working status indicator lights are used to indicate the operating status, shutdown or fault status of the equipment inside the container, and the buzzer is used for safety interlock readiness warning;

[0085] (6) An exhaust system is provided for the accelerating tube 203. During the beam emission operation of the accelerating tube 203, the exhaust system needs to keep working continuously. After the accelerating tube 203 finishes working, ventilation should continue for a period of time before ventilation can be stopped. Specifically, a ventilation pipeline 10 is embedded in the top of the shielding body 2. One end of the ventilation pipeline is directly opposite to the accelerating tube 203, and the other end of the ventilation pipeline is connected to a ventilation port provided on the side of the container.

[0086] The ventilation openings of the accelerator shielding, the ventilation ducts, and one end of the ventilation duct is connected to the ventilation opening of the accelerator shielding, and the other end is connected to the ventilation opening of the irradiation chamber.

[0087] A miniaturized self-shielding irradiation system provided in this embodiment can not only meet the continuous irradiation requirements of sewage but also ensure that the sewage is sent in and out while shielding the rays.

[0088] A miniaturized self-shielding irradiation system provided in this embodiment has a reliable safety interlock device. Only when the conditions are met can the accelerator tube emit beams, providing reliable safety protection for operators and the public.

[0089] Compared with the traditional transmission of solid goods, the main irradiation target of the miniaturized self-shielding irradiation system provided in this embodiment is various types of sewage, which are characterized by a large variety and complex composition. Combining with the control of sewage irradiation dose, the transmission speed of sewage in the area under the electron gun beam (i.e., the water flow rate in the first pipeline) can be adjusted according to the irradiation dose of the fan-shaped electron beam, with a minimum flow rate of 3.6 L / min and a maximum flow rate of up to 54 L / min.

[0090] A miniaturized self-shielding irradiation system provided in this embodiment generates a uniformly scanned electron beam by the accelerator tube. The sewage passes through the self-shielded electron beam irradiation area to achieve irradiation with a set dose. The irradiation area forms a closed space by the self-shielding structure during irradiation, making the environmental radiation dose meet or even better meet the requirements of radiation protection standards and ensuring the safety of the staff.

[0091] A miniaturized self-shielding irradiation system provided in this embodiment has the following characteristics:

[0092] (1) Self-shielding. A miniaturized self-shielding irradiation system provided in this embodiment makes the irradiation area a fully enclosed shielding structure during irradiation, with an extremely low environmental radiation dose, allowing operators to operate nearby.

[0093] (2) Miniaturization. A miniaturized self-shielding irradiation system provided in this embodiment adopts a miniaturized design from the core components such as the accelerator tube and the scanning box to the microwave head, which is integrated in a container with a length of 6.4 m, a width of 2.3 m, and a height of 2.89 m. Its characteristics of miniaturization and compact structure are particularly suitable for irradiation processing in various scenarios.

[0094] (3) High energy. A miniaturized self-shielding irradiation system provided in this embodiment uses an electron linear accelerator as the radiation source, generating an electron beam with an energy of 1.5 - 3.5 MeV, which has a relatively high energy among miniaturized self-shielding electron beam irradiation equipment.

[0095] (4) Safe and reliable. A miniaturized self-shielded irradiation system provided by this embodiment is designed with a safety chain lock device to ensure the safety of the equipment and operators.

[0096] (5) Easy to operate. A miniaturized self-shielded irradiation system provided by this embodiment adopts a highly automated process. There are few steps for personnel to operate. The human-machine interface of the operating system in the main control cabinet is simple, clear and convenient to operate.

[0097] Embodiment 2

[0098] Embodiment 2 of the present invention provides a working method of a miniaturized self-shielded irradiation system as in Embodiment 1, including the following steps:

[0099] The waveguide window feeds the radio frequency microwave transmitted by the waveguide into the accelerating tube;

[0100] The accelerating tube acts on electrons with the standing wave formed by the radio frequency microwave to accelerate the electrons;

[0101] The scanning magnet generates an alternating magnetic field to deflect the electrons, forming a fan-shaped electron beam;

[0102] The scanning box provides the vacuum space required for the fan-shaped electron beam to irradiate the sewage in the irradiation water box.

[0103] The above are only the preferred embodiments of the present invention and are not used to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A miniaturized self-shielding irradiation system, characterized in that: It includes an accelerating tube, a scanning box and an irradiation chamber arranged from top to bottom, and also includes a scanning magnet, a lead shell, a waveguide window arranged on one side of the accelerating tube and an irradiation water box arranged in the irradiation chamber; wherein the accelerating tube, the scanning magnet, the scanning box, the irradiation chamber, the waveguide window and the titanium pump are all arranged in the lead shell; The waveguide window is used to feed the radio frequency microwave transmitted by the waveguide into the accelerating tube; The accelerating tube is used to apply standing waves formed by radio frequency microwaves to electrons to accelerate the electrons; The scanning magnet is annular and is sleeved outside the scanning box, and is used to generate an alternating magnetic field to deflect electrons to form a fan-shaped electron beam; The scanning box is used to provide the vacuum space required by the fan-shaped electron beam, so that the fan-shaped electron beam can irradiate the sewage in the irradiation water box.

2. A miniaturized self-shielding irradiation system as claimed in claim 1, characterized in that: Also included is a titanium pump disposed on one side of the scanning box; The titanium pump is used to maintain the vacuum inside the accelerating tube and the scanning box.

3. A miniaturized self-shielding irradiation system as claimed in claim 1, characterized in that: It also includes a ceramic bellows assembly for connecting the accelerating tube and the scanning box, and the ceramic segment of the ceramic bellows assembly is used to detect the beam current through a current transformer.

4. A miniaturized self-shielding irradiation system as claimed in claim 1, characterized in that: The waveguide is sequentially connected with a magnetron, a pulse transformer and a pulse modulator; After the pulses generated by the pulse modulator are provided to the magnetron through the pulse transformer, the magnetron generates radio frequency microwaves.

5. A miniaturized self-shielding irradiation system as claimed in claim 4, characterized in that: The pulses generated by the electron gun power supply in the pulse modulator provide pulses for the electron gun of the accelerating tube through the electron gun pre-transformer, thereby pulling electrons out of the cathode of the electron gun heated by the filament.

6. A miniaturized self-shielding irradiation system as claimed in claim 1, characterized in that: Also included is a sewage delivery system connected to the irradiated water box; The sewage conveying system is used to convey sewage into and out of the irradiation water box.

7. A miniaturized self-shielding irradiation system as claimed in claim 6, characterized in that: Also included is a container, in which the sewage conveying system and the lead shell are both arranged.

8. A miniaturized self-shielding irradiation system as claimed in claim 1, characterized in that: The speed at which the sewage enters the irradiation water box is adjusted according to the irradiation dose of the fan-shaped electron beam.

9. A miniaturized self-shielding irradiation system as claimed in claim 1, characterized in that: The water inlet and outlet pipes of the irradiation water box are pre-buried in the lead shell.

10. A working method of a miniaturized self-shielding irradiation system according to any one of claims 1 to 9, characterized in that: The steps include: The waveguide window feeds the radio frequency microwave transmitted by the waveguide into the accelerating tube; The accelerating tube applies standing waves formed by radio frequency microwaves to electrons to accelerate them. The scanning magnet generates an alternating magnetic field to deflect the electrons, forming a fan-shaped electron beam; The scanning box provides the vacuum space required by the fan-shaped electron beam, allowing the fan-shaped electron beam to irradiate the sewage in the irradiation water box.

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