Proton accelerator device applied to medical nuclide preparation

Abstract

The invention discloses a proton accelerator device applied to medical nuclide preparation, and belongs to the technical field of proton accelerators, and the proton accelerator device comprises an outer cavity, an isolation power supply device, a voltage stabilizing device, a high-voltage transmission device, a gas source, an ion source device, an extraction and electron suppression device and an acceleration constraint transmission device; the device can generate an ion beam with a MeV energy level; according to different voltage grades, the devices of the proton accelerator can be subjected to matching optimization design, so that time and material cost are saved. The proton accelerator device is high in integration degree, good in compatibility and wide in application range. The method can be applied to medical nuclide preparation and is also suitable for other scenes applying high-energy ion beams.

Description

Technical Field

[0001] The invention belongs to the technical field of proton accelerators, and in particular relates to a proton accelerator device used for preparing medical nuclides. Background Art

[0002] The method of preparing 99Mo based on the neutron activation method 98Mo(n,γ)99Mo reaction using a small accelerator neutron source involves a 1.5MV UHV power supply. The atmospheric insulation level cannot meet the insulation requirements of the UHV power supply. The power supply itself and the corresponding ion source accelerator device should be placed inside a closed chamber filled with SF6 gas. The pressure of SF6 inside the chamber is determined by the required voltage of the ion source accelerator device. The maximum voltage is 1.5MeV, and the SF6 pressure needs to reach 0.6MPa. Therefore, when designing the device, it is necessary to consider the insulation requirements between the various components of the device and the pressure bearing capacity of the components. At the same time, some of our commonly used equipment is used in an atmospheric environment. When the external environment is converted to a pressure environment, the equipment may not work properly. When designing the ion source accelerator device, it is necessary to consider the environmental pressure to ensure that the equipment can work normally in a pressure environment. Summary of the invention

[0003] The present invention designs a proton accelerator device for the preparation of medical nuclides based on the generation principle of inductively coupled plasma. A proton accelerator device for the preparation of medical nuclides is mainly composed of an isolation power supply device, a high-voltage transmission device, a voltage stabilizing device, a control device, a gas source, a gas flow control device, an ion source device, a plasma extraction and electron suppression device, a proton acceleration confinement transmission device and an external cavity. The device has good compatibility and a high degree of deviceization. The various devices of the proton accelerator device can be matched and designed according to the voltage level of the power supply required by the device to meet the normal operation of the device and generate ion beams with specific energy and specific types.

[0004] The technical solution adopted by the present invention to solve the problem is:

[0005] A proton accelerator device used for preparation of medical nuclides, comprising an external cavity, an isolation power supply device, a voltage stabilizing device, a high-voltage transmission device, a gas source, an ion source device, an extraction and electron suppression device, and an acceleration and confinement transmission device;

[0006] The outer cavity comprises a first cavity, a connecting cavity and a second cavity, wherein the first cavity is connected to the second cavity through the connecting cavity; the isolated power supply device is arranged in the first cavity, the high voltage transmission device is arranged in the connecting cavity, and the gas source, ion source device, extraction and electron suppression device and accelerated confinement transmission device are arranged in the second cavity;

[0007] The isolated power supply device comprises a motor, a generator and an insulating rod, wherein the motor is connected to the generator via the insulating rod;

[0008] The voltage stabilizing device includes a voltage stabilizing transformer and an isolation transformer. The alternating current generated by the generator is connected to the voltage stabilizer in the voltage stabilizing device. The voltage stabilizing transformer outputs a stable voltage to supply power to the extraction power supply, the suppression power supply, the control device and the isolation transformer.

[0009] The high-voltage transmission device comprises a high-voltage transmission electrode, an extraction power supply high-voltage transmission line, a suppression power supply transmission line and an ion source end high-voltage platform power supply transmission line; the high-voltage transmission electrode is in direct contact with the high-voltage power supply to transmit the high voltage to the ion acceleration confinement transmission device; one end of the extraction voltage high-voltage power supply transmission line is connected to the extraction power supply, and the other end is connected to the PG electrode; one end of the suppression power supply transmission line is connected to the suppression power supply, and the other end is connected to the EG electrode; one end of the ion source end high-voltage platform power supply transmission line is connected to an isolation transformer, and the other end is used to power the equipment on the high-voltage platform of the outer cavity of the ion source accelerator, and the equipment includes a gas flow control device;

[0010] The gas source is in communication with the ion source chamber in the ion source device;

[0011] The ion source device comprises a radio frequency power supply, an automatic impedance matcher, a coil, an ion source chamber, an ion source upper cover plate, an insulating support rod and an ion source lower cover plate; the ion source chamber and the insulating support rod are arranged between the ion source upper cover plate and the ion source lower cover plate, the insulating support rod is arranged on the outside of the ion source chamber, the ion source chamber is fixed by connecting and clamping the insulating support rod and the ion source upper cover plate and the ion source lower cover plate, the coil is wound and arranged at the outer periphery of the ion source chamber, and the radio frequency power supply is connected to the coil through the automatic impedance matcher;

[0012] The plasma extraction and electron suppression device comprises a PG electrode, an EG electrode, a GG electrode, a first insulating support and a second insulating support, wherein the first insulating support is arranged between the PG electrode and the EG electrode, and the second insulating support is arranged between the EG electrode and the GG electrode;

[0013] The accelerating confined transmission device comprises a plurality of connected accelerating tubes.

[0014] In the above technical scheme, the proton accelerator device used for the preparation of medical nuclides also includes a control device, which includes an optoelectronic control chassis, a signal transmission optical fiber, an optical fiber vacuum feedthrough and a control host. The optoelectronic control chassis located on the high-voltage platform converts the analog control electrical signal into an optical signal, transmits it to the optical fiber vacuum feedthrough interface via the signal transmission optical fiber, and then transmits the optical signal to the outside of the sealed steel barrel through the optical fiber vacuum feedthrough, and then transmits it to the optoelectronic control chassis outside the steel barrel through the signal transmission optical fiber, converts the optical signal into an electrical signal again, and transmits it to the control host to achieve real-time regulation of equipment parameters.

[0015] In the above technical solution, the proton accelerator device used for preparation of medical nuclides further includes a control device, and the gas flow control device includes a gas mass flow meter and a metal ball valve.

[0016] In the above technical solution, the ion source chamber is made of non-metallic material, preferably quartz glass or boron nitride.

[0017] In the above technical solution, the outer diameter of the ion source chamber is 50 mm, and the wall thickness is 3 to 10 mm.

[0018] In the above technical solution, the coil is a hollow coil made of copper, and the wire diameter is selected to be 3 mm or more.

[0019] In the above technical solution, the surfaces of the ion source upper cover plate and the ion source lower cover plate facing the plasma are coated with a molybdenum coating of more than 1 μm.

[0020] In the above technical solution, the first insulating support and the second insulating support are alumina ceramics with a height of 60 mm.

[0021] In summary, the beneficial effects of the present invention are:

[0022] 1. The proton accelerator device used for the preparation of medical nuclides of the present invention provides a proton accelerator device based on inductively coupled plasma for use under power supply conditions, which can generate an ion beam with an energy level of MeV.

[0023] 2. The present invention can optimize the matching design of each device of the proton accelerator according to different voltage levels, saving time and material costs. The proton accelerator device has a high degree of deviceization, good compatibility and a wide range of applications.

[0024] 3. The proton accelerator device for the preparation of medical nuclides of the present invention can not only be used for the preparation of medical nuclides, but also can be applied to other scenarios where high-energy ion beams are used. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1This is the overall plan view of the proton accelerator device used for the preparation of medical nuclides.

[0026] Figure 2 This is a partial enlarged view of the ion source accelerator end.

[0027] Figure 3 Schematic diagram of the control device.

[0028] In the figure: 1. Isolation power supply device; 1-1. Motor; 1-2. Insulation rotating rod; 1-3. Generator; 2. Voltage stabilizing device; 3. Control device; 3-1. Photoelectric conversion chassis; 3-2. Signal transmission optical fiber; 3-3. Optical fiber vacuum feedthrough; 4. High-voltage transmission device; 4-1. High-voltage transmission electrode; 4-2. Suppression power transmission line; 4-3. Lead-out power high-voltage transmission line; 4-4. Ion source end high-voltage platform power supply transmission line; 5. Ion source device; 5-1. Radio frequency power supply; 5-2. Automatic impedance matcher; 5-3, ion source upper cover; 5-4, insulating support rod; 5-5, coil; 5-6, ion source lower cover; 5-7, ion source chamber; 6, gas flow control device; 7, gas source; 8, extraction and electron suppression device; 8-1, PG electrode; 8-2, EG electrode; 8-3, GG electrode; 8-4, first insulating support; 8-5, second insulating support; 8-6, extraction power supply; 8-7, suppression power supply; 9, acceleration and confinement transmission device; 10, outer cavity. DETAILED DESCRIPTION

[0029] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be pointed out that the embodiments described below are intended to facilitate understanding of the present invention and do not have any limiting effect on the present invention.

[0030] Example

[0031] like Figure 1 , Figure 2 and Figure 3 As shown, the proton accelerator device used for the preparation of medical nuclides described in the present invention comprises an isolation power supply device, a high voltage transmission device, a voltage stabilizing device, a control device, a gas source, a gas flow control device, an ion source device, a plasma extraction and electron suppression device, a proton acceleration confinement transmission device and a proton source accelerator outer cavity. The proton accelerator outer cavity 10 is composed of two vertical metal steel barrels connected by a neck tube, and the cavity itself is sealed by a metal flange plus a rubber ring. Figure 1The vertical steel drum on the left side of the middle has a flange interface reserved for the connection of the high-voltage power supply. Both vertical steel drums have access ports reserved at the lower right side to facilitate maintenance personnel to enter the interior for maintenance. The vertical steel drum connection neck pipe is connected with a bellows, which has a certain offset in all directions to facilitate the connection and installation of the steel drum. The vertical cavity is made of Q235 material, which has high mechanical strength and meets the pressure requirement of 0.6MPa.

[0032] The isolated power supply device 1 is composed of a motor 1-1, a generator 1-3, and an insulating rotating rod 1-2. The motor 1-1 is installed at the bottom of the steel barrel on the left side of the outer cavity 10 of the ion source accelerator, and the insulating rotating rod 1-2 is connected to the motor 1-1 and the generator 1-3 through a coupling. The motor 1-1 adjusts the speed through the driver, thereby adjusting the power supply power of the generator 1-3. The generator 1-3 and the insulating rotating rod 1-2 are supported and fixed by a workpiece of insulating material. The generator 1-3 generates 220V AC at the upper end to meet the power demand of the equipment on the high-voltage platform. This isolated power supply method can avoid the short circuit of the power supply to the ground.

[0033] The voltage stabilizing device 2 is composed of a voltage stabilizing transformer and an isolation transformer. The voltage stabilizing device 2 is located on the high-voltage platform above the generator 1-3. After the generator 1-3 generates 220V AC power, it is connected to the voltage stabilizing transformer in the voltage stabilizing device 2. The voltage stabilizing transformer outputs stable 220V AC power to supply power to the extraction power supply 8-6, the suppression power supply 8-7, the control device 3 and the isolation transformer in the voltage stabilizing device 2.

[0034] The control device 3 is composed of an optoelectronic conversion chassis 3-1, a signal transmission optical fiber 3-2, an optical fiber vacuum feedthrough 3-3, and a control host. Since all the equipment is on a high-voltage platform, the use of commonly used electrical signal transmission for equipment control will cause a short circuit between the high-voltage power supply and the ground potential, which may cause damage to the power supply and various equipment. Therefore, it is necessary to convert the electrical signal into an optical signal and transmit it from the high potential to the ground potential through the optical fiber, and then convert the optical signal into an electrical signal and transmit it to the control host. There are two ways to convert electrical signals into optical signals: wired and wireless. The wired method has stable signal transmission, but the disadvantage is that the transmission medium needs to consider the pressure resistance and meet the pressure resistance requirements. The disadvantage of the wireless method is that the signal is easily affected by the on-site environment, and the optical signal has large losses and is unstable during transmission. The advantage is that the pressure resistance of the transmission medium does not need to be considered. The use of optical fiber for transmission has the following advantages: 1. Optical signals are transmitted in optical fiber, which is not affected by the on-site environment and has a certain degree of flexibility. They can be deflected and avoided according to the on-site conditions. The light transmission loss in the optical fiber is low and does not affect the reception of the signal. 2. The equipment signals need to be transmitted and received in multiple channels at the same time. By using optical fiber, there is no possibility of mutual influence between the signals, which can ensure the stability and reliability of the control device. Figure 3 The optoelectronic conversion chassis 3-1 shown on the high-voltage platform converts the analog control electrical signals of each device into optical signals, transmits them to the optical fiber vacuum feedthrough 3-3 interface via the signal transmission optical fiber 3-2, and then transmits the optical signals to the outside of the sealed steel barrel through the optical fiber vacuum feedthrough 3-3, and then transmits them to the optoelectronic conversion chassis 3-1 outside the steel barrel via the signal transmission optical fiber 3-2, converts the optical signals into electrical signals again, and transmits them to the control host to realize real-time regulation of equipment parameters.

[0035] The high-voltage transmission device 4 is composed of a high-voltage transmission electrode 4-1, an extraction power supply high-voltage transmission line 4-3, a suppression power supply transmission line 4-2, and an ion source end high-voltage platform power supply transmission line 4-4. The high-voltage transmission electrode 4-1 is installed on the shell of the high-voltage platform above the isolation power supply device 1, directly in contact with the high-voltage power supply, and transmits the high voltage to the ion acceleration and confinement transmission device 9. One end of the extraction voltage high-voltage power supply transmission line 4-3 is connected to the extraction power supply 8-6, and the other end is connected to the PG electrode. The high voltage of the extraction power supply is loaded on the PG electrode to form an electric field to extract and accelerate ions. One end of the suppression power supply transmission line 4-2 is connected to the suppression power supply, and the other end is connected to the EG electrode. The high voltage of the suppression power supply is loaded on the EG electrode to form an electric field to suppress stray electrons generated by the collision of the ion beam with the residual gas during the transmission process. One end of the ion source end high-voltage platform power supply transmission line 4-4 is connected to the isolation transformer in the voltage stabilizing device 2, and the other end is a socket strip, which supplies power to the equipment on the high-voltage platform above the steel barrel on the right side of the ion source accelerator outer cavity 10. By using an isolation transformer as the transfer method, the RF power supply 5-1, the gas flow control device 6, the control device 3 and other devices can be prevented from being grounded with the lead-out power supply 8-6 and the suppression power supply 8-7, thereby reducing the probability of the lead-out power supply 8-6 and the suppression power supply 8-7 damaging other devices when a fire occurs.

[0036] The ion source device 5 is composed of a radio frequency power supply 5-1, an automatic impedance matcher 5-2, a coil 5-5, an ion source chamber 5-7, an ion source upper cover plate 5-3, an insulating support rod 5-4, and an ion source lower cover plate 5-6. The radio frequency power supply 5-1 and the automatic impedance matcher 5-2 with a high market maturity of 13.56MHz frequency and a power of 300-1000W are selected as the excitation power supply of the ion source. The ion source chamber 5-7 is a cylinder with upper and lower openings, and a multi-turn coil 5-5 is wound around the outside. After the coil 5-5 is connected to the radio frequency device, the gas inside the ion source chamber 5-7 is excited to generate plasma. The gas inside the chamber is fed in through the air supply device with the help of an air inlet pipe that runs through the ion source upper cover plate 5-3. A sealing groove is machined on one side of the ion source upper cover plate 5-3 that contacts the ion source chamber 5-7, which is concentrically matched with the ion source chamber 5-7. At the same time, the upper cover plate is drilled with concentrically distributed threaded through holes to facilitate the insulating support rod 5-4 to pass through. The other end of the insulating support rod 5-4 is fixed to the lower cover plate by a thread. The ion source chamber 5-7 is fixed by the pressure provided by the threaded cooperation of the ion source upper cover plate 5-3, the ion source lower cover plate 5-6 and the insulating support rod 5-4. In addition, the sealing ring between the ion source upper cover plate 5-3, the ion source lower cover plate 5-6 and the ion source chamber 5-7 is deformed after being compressed to form a vacuum seal. The ion source chamber 5-7 is made of non-metallic materials, such as quartz glass and boron nitride. The ion source chamber adopts an outer diameter of 50mm and a wall thickness of 3 to 10mm. Under the conditions of meeting the pressure bearing and sealing properties, the wall thickness should not be too thick. The whole is a cylindrical tube with two ends open, and the end face shape is changed according to the sealing method. The two ends are respectively in contact with the ion source upper cover plate 5-3 and the ion source lower cover plate 5-6. The coil 5-5 is formed by winding multiple turns around the outer diameter of the ion source chamber, and the whole is spiral. The coil diameter, number of turns and turn spacing can affect the electron density of the excited plasma and need to be adjusted according to the required ion beam performance and chamber diameter. Preferably, the coil 5-5 should be made of materials with excellent thermal conductivity and high electrical conductivity, such as copper. Further, the coil 5-5 can be made of a hollow coil, which is convenient for using a coolant to remove heat from the coil. The ion source upper cover plate 5-3 and the ion source lower cover plate 5-6 are made of metal materials with good thermal conductivity, and the outer shape is a flange shape. The surface facing the plasma is coated with a molybdenum coating of more than 1μm. A sealing groove is machined according to the diameter of the ion source chamber 5-7 for placing a sealing ring, which forms a vacuum seal with the ion source chamber 5-7 after being compressed. The ion source part is threadedly matched with the accelerator PG electrode 8-1 through the ion source lower cover plate 5-6, and the end face of the ion source lower cover plate 5-6 is machined with a sealing groove, which is concentrically matched with the ion source chamber 5-7 through the sealing groove.

[0037] The gas source 7 is composed of a gas source cylinder and a transmission pipeline. The type of gas source is determined by the required ion beam, and a gas cylinder with the smallest possible volume is used to meet the narrow space requirements on the high-pressure platform. Affected by the pressure of external SF6, when the gas is transmitted in the pipeline, the material with the smallest possible leakage rate should be selected, and at the same time, the pipeline joints should meet good sealing and stability to ensure that external SF6 does not enter the pipeline and the gas source gas does not leak into the external SF6 environment. According to the type of ions required by the experiment, hydrogen is used during the device debugging; when debugging parameters, deuterium is used.

[0038] The gas flow control device 6 is composed of a gas mass flow meter and a metal ball valve. The mass flow meter controls the flow of gas by the size of the opening and closing of the internal electromagnetic valve port to meet the changing needs of the device's real-time air intake. At the same time, since the mass flow meter is also in the SF6 pressure environment, the external environmental pressure will cause the electromagnetic valve to work abnormally, resulting in the inability to control the air intake normally. Therefore, when selecting a mass flow meter, pay attention to selecting a mass flow meter that can withstand external pressure, or take a certain approach to protect the mass flow meter to avoid the influence of external environmental pressure. The metal ball valve is located between the ion source air inlet pipe and the mass flow meter. The mass flow meter or gas source can be quickly replaced by closing the metal ball valve.

[0039] The extraction and electron suppression device 8 is composed of a PG electrode 8-1, an EG electrode 8-2, a GG electrode 8-3, a first insulating support 8-4, a second insulating support 8-5, an extraction power supply 8-6, and a suppression power supply 8-7. The PG electrode 8-1, the EG electrode 8-2, and the GG electrode 8-3 need to be designed with a specific structure according to the requirements of ion beam extraction and stray electron shielding. The extraction power supply 8-6 adopts a 50kV high-voltage power supply, which is loaded onto the PG electrode 8-1 via the extraction high-voltage power supply transmission line 4-3 for plasma extraction acceleration. The suppression power supply 8-7 selects a -5kV high-voltage power supply, which is loaded onto the EG electrode 8-2 via the suppression power supply transmission line 4-2 for the suppression of stray electrons inside the accelerator. There is a certain pressure difference between the PG electrode 8-1, the EG electrode 8-2, and the GG electrode 8-3, and they need to be separated by materials with certain insulation capabilities (such as ceramics, PEEK, epoxy, etc.). There is a maximum voltage difference of 55kV between the PG electrode 8-1 and the EG electrode 8-2. At the same time, the electrodes and the insulating materials are both in SF6 gas under experimental conditions. Considering all factors, the first insulating support 8-4 is separated by alumina ceramic with a height of 60mm. There is a voltage difference of 5kV between the EG electrode 8-2 and the GG electrode 8-3. Considering the installation problem, the second insulating support is separated by alumina ceramic with a height of 60mm.

[0040] The proton acceleration confinement transport device 9 is composed of 5 sections of accelerating tubes, and the maximum partial voltage of each section of the accelerating tube is 500 kV. At the same time, the inner electrode of the accelerating tube is optimized to adapt to different parameters and different types of ions.

[0041] It will be easily understood by those skilled in the art that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A proton accelerator device for preparing medical nuclides, characterized in that: It includes an external cavity, an isolated power supply device, a voltage stabilizing device, a high-voltage transmission device, a gas source, an ion source device, an extraction and electron suppression device, and an accelerated confinement transmission device; The outer cavity comprises a first cavity, a connecting cavity and a second cavity, wherein the first cavity is connected to the second cavity through the connecting cavity; the isolated power supply device is arranged in the first cavity, the high voltage transmission device is arranged in the connecting cavity, and the gas source, ion source device, extraction and electron suppression device and accelerated confinement transmission device are arranged in the second cavity; The isolated power supply device comprises a motor, a generator and an insulating rod, wherein the motor is connected to the generator via the insulating rod; The voltage stabilizing device includes a voltage stabilizing transformer and an isolation transformer. The alternating current generated by the generator is connected to the voltage stabilizer in the voltage stabilizing device. The voltage stabilizing transformer outputs a stable voltage to supply power to the extraction power supply, the suppression power supply, the control device and the isolation transformer. The high-voltage transmission device comprises a high-voltage transmission electrode, an extraction power supply high-voltage transmission line, a suppression power supply transmission line and an ion source end high-voltage platform power supply transmission line; the high-voltage transmission electrode is in direct contact with the high-voltage power supply to transmit the high voltage to the ion acceleration confinement transmission device; one end of the extraction voltage high-voltage power supply transmission line is connected to the extraction power supply, and the other end is connected to the PG electrode; one end of the suppression power supply transmission line is connected to the suppression power supply, and the other end is connected to the EG electrode; one end of the ion source end high-voltage platform power supply transmission line is connected to an isolation transformer, and the other end is used to power the equipment on the high-voltage platform of the outer cavity of the ion source accelerator, and the equipment includes a gas flow control device; The gas source is in communication with the ion source chamber in the ion source device; The ion source device comprises a radio frequency power supply, an automatic impedance matcher, a coil, an ion source chamber, an ion source upper cover plate, an insulating support rod and an ion source lower cover plate; the ion source chamber and the insulating support rod are arranged between the ion source upper cover plate and the ion source lower cover plate, the insulating support rod is arranged on the outside of the ion source chamber, the ion source chamber is fixed by connecting and clamping the insulating support rod and the ion source upper cover plate and the ion source lower cover plate, the coil is wound and arranged at the outer periphery of the ion source chamber, and the radio frequency power supply is connected to the coil through the automatic impedance matcher; The plasma extraction and electron suppression device comprises a PG electrode, an EG electrode, a GG electrode, a first insulating support and a second insulating support, wherein the first insulating support is arranged between the PG electrode and the EG electrode, and the second insulating support is arranged between the EG electrode and the GG electrode; The accelerating confined transmission device comprises a plurality of connected accelerating tubes.

2. A proton accelerator device for preparing medical nuclides according to claim 1, characterized in that: The proton accelerator device used for the preparation of medical nuclides also includes a control device, which includes an optoelectronic control chassis, a signal transmission optical fiber, an optical fiber vacuum feedthrough and a control host. The optoelectronic control chassis located on the high-voltage platform converts the analog control electrical signal into an optical signal, transmits it to the optical fiber vacuum feedthrough interface via the signal transmission optical fiber, and then transmits the optical signal to the outside of the sealed steel barrel through the optical fiber vacuum feedthrough, and then transmits it to the optoelectronic control chassis outside the steel barrel through the signal transmission optical fiber, converts the optical signal into an electrical signal again, and transmits it to the control host to achieve real-time regulation of equipment parameters.

3. A proton accelerator device for preparing medical nuclides according to claim 1, characterized in that: The proton accelerator device used for preparing medical nuclides also includes a control device, and the gas flow control device includes a gas mass flow meter and a metal ball valve.

4. A proton accelerator device for preparing medical nuclides according to claim 1, characterized in that: The material of the ion source chamber is quartz glass or boron nitride.

5. A proton accelerator device for preparing medical nuclides according to claim 1, characterized in that: The outer diameter of the ion source chamber is 50 mm, and the wall thickness is 3-10 mm.

6. A proton accelerator device for preparing medical nuclides according to claim 1, characterized in that: The coil is a hollow coil made of copper.

7. A proton accelerator device for preparing medical nuclides according to claim 1, characterized in that: The surfaces of the ion source upper cover plate and the ion source lower cover plate facing the plasma are coated with a molybdenum coating with a m thickness of more than 1 μm.

8. A proton accelerator device for preparing medical nuclides according to claim 1, characterized in that: The first insulating support and the second insulating support are alumina ceramics with a height of 60 mm.

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