A proton accelerator device used for preparation of medical nuclides

Abstract

The present invention discloses a proton accelerator device for use in the preparation of medical nuclides. The present invention belongs to the technical field of proton accelerators and 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. This device can generate ion beams with MeV energy levels. The various devices of the proton accelerator can be matched and optimized 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. It can be used in the preparation of medical nuclides, as well as in other scenarios where high-energy ion beams are used.

Description

Technical Field

[0001] The present 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 for preparing 99Mo using a small accelerator neutron source via the neutron activation method using the 98Mo(n,γ)99Mo reaction requires a 1.5 MV ultra-high voltage power supply. However, atmospheric insulation levels do not meet the insulation requirements of the ultra-high voltage power supply. The power supply and the corresponding ion source accelerator must be placed within a sealed chamber filled with SF6 gas. The SF6 pressure within the chamber is determined by the required voltage of the ion source accelerator, with a maximum voltage of 1.5 MeV and a required SF6 pressure of 0.6 MPa. Therefore, the insulation requirements between various components and their pressure tolerance must be considered during device design. Furthermore, some commonly used equipment operates in an atmospheric environment. When the external environment is converted to a pressurized environment, the equipment may malfunction. Therefore, the design of the ion source accelerator requires additional consideration of the ambient pressure to ensure that the equipment can operate properly under pressure. Summary of the Invention

[0003] Based on the principle of inductively coupled plasma generation, the present invention designs a proton accelerator device for use in the preparation of medical nuclides. The proton accelerator device for use in the preparation of medical nuclides primarily comprises an isolated power supply device, a high-voltage transmission device, a voltage stabilization 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 and confinement transmission device, and an external cavity. The device boasts excellent compatibility and a high degree of modularity. The various components of the proton accelerator device can be designed and matched to the voltage level of the device's required power supply to ensure normal operation and generate an ion beam of a specific energy and type.

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

[0005] A proton accelerator device for use in the 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 includes 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 includes a motor, a generator and an insulating rod, and the motor is connected to the generator through 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 includes 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 and confinement transmission device; one end of the extraction power supply high-voltage 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 the isolation transformer and the other end is used to power the equipment on the high-voltage platform of the ion source accelerator outer cavity, 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 includes a radio frequency power supply, an automatic impedance matcher, a coil, an ion source chamber, an ion source upper cover, an insulating support rod, and an ion source lower cover; the ion source chamber and the insulating support rod are arranged between the ion source upper cover and the ion source lower cover, the insulating support rod is arranged outside the ion source chamber, the ion source chamber is fixed by the connection between the insulating support rod and the ion source upper cover and the ion source lower cover, 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 extraction and electron suppression device includes a PG electrode, an EG electrode, a GG electrode, a first insulating support and a second insulating support, wherein the first insulating support is provided between the PG electrode and the EG electrode, and the second insulating support is provided between the EG electrode and the GG electrode;

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

[0014] In the above technical solution, 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 via 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 materials, 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 above.

[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 with a thickness 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 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 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 be applicable 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. Electric motor; 1-2. Insulation 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 will be described in further detail below with reference to the accompanying drawings and examples. It should be noted that the examples 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 for medical nuclide preparation described in the present invention includes an isolated power supply device, a high-voltage transmission device, a voltage stabilization 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 and 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. The cavity itself is sealed by a metal flange and a rubber ring. Figure 1The vertical drum on the center left has a flange connection on the upper left side for connecting a high-voltage power supply. Both drums have access hatches on the lower right side for easy access for maintenance personnel. The connecting necks of the drums are connected using bellows, which are offset in all directions to facilitate connection and installation. The vertical chambers are made of Q235 material, which offers high mechanical strength and meets the required pressure resistance of 0.6 MPa.

[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 ion source accelerator outer cavity 10, 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 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 short circuit of the power supply to the ground.

[0033] The voltage stabilizing device 2 consists of a voltage stabilizing transformer and an isolation transformer. The voltage stabilizing device 2 is located on a high-voltage platform above the generator 1-3. The generator 1-3 generates 220V AC power, which is then connected to the voltage stabilizing transformer in the voltage stabilizing device 2. The voltage stabilizing transformer outputs a stable 220V AC power supply, which powers the output 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 a photoelectric 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 conventional 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 devices. 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, the optical signal has large losses and is unstable during transmission, and 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 fibers, which are not affected by the on-site environment and have a certain degree of flexibility. They can be deflected and avoided according to the on-site conditions. In addition, the light transmission loss in optical fibers is low, which does not affect the reception of signals. 2. Equipment signals need to be transmitted and received in multiple channels at the same time. By using optical fibers, there is no possibility of mutual influence between the signals, which can ensure the stability and reliability of the control device. Figure 3 As shown, the optoelectronic conversion chassis 3-1 located on the high-voltage platform converts the analog control electrical signals of each device into optical signals, which are transmitted to the optical fiber vacuum feedthrough 3-3 interface via the signal transmission optical fiber 3-2. The optical signals are then transmitted to the outside of the sealed steel barrel via the optical fiber vacuum feedthrough 3-3, and then transmitted to the optoelectronic conversion chassis 3-1 outside the steel barrel via the signal transmission optical fiber 3-2. The optical signals are converted into electrical signals again and transmitted to the control host to realize real-time control of device 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 mounted on the housing of the high-voltage platform above the isolation power supply device 1, in direct contact with the high-voltage power supply, and transmits the high voltage to the ion acceleration and confinement transmission device 9. The extraction voltage high-voltage power supply transmission line 4-3 is connected at one end to the extraction power supply 8-6 and at the other end to the PG electrode. The high voltage of the extraction power supply is applied to the PG electrode to form an electric field to extract and accelerate ions. The suppression power supply transmission line 4-2 is connected at one end to the suppression power supply and at the other end to the EG electrode. The high voltage of the suppression power supply is applied to the EG electrode to form an electric field to suppress stray electrons generated by collisions between the ion beam and residual gas during transmission. The ion source end high-voltage platform power supply transmission line 4-4 is connected at one end to the isolation transformer in the voltage stabilizing device 2 and at the other end to a power 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 in the event of a fire.

[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 with a frequency of 13.56MHz and a power of 300-1000W and the automatic impedance matcher 5-2 with high market maturity 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 by an air supply device with the help of an air inlet pipe that passes through the ion source upper cover plate 5-3. A sealing groove is machined on the 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 passage of the insulating support rod 5-4. The other end of the insulating support rod 5-4 is threadedly secured to the lower cover plate. The ion source chamber 5-7 is secured in place by pressure provided by the threaded engagement of the ion source upper cover plate 5-3, the ion source lower cover plate 5-6, and the insulating support rod 5-4. Furthermore, the sealing rings between the ion source upper cover plate 5-3, the ion source lower cover plate 5-6, and the ion source chamber 5-7 deform under pressure to form a vacuum seal. The ion source chamber 5-7 is made of non-metallic materials such as quartz glass or boron nitride. The ion source chamber has an outer diameter of 50 mm and a wall thickness of 3 to 10 mm. The wall thickness should not be too thick while ensuring pressure resistance and sealing properties. The overall structure is a cylindrical tube with open ends, and the end face shape varies depending on the sealing method. The ends are in contact with the ion source upper cover plate 5-3 and the ion source lower cover plate 5-6, respectively. The coil 5-5 is formed by winding multiple turns around the outer diameter of the ion source chamber, resulting in an overall spiral shape. 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 a material with excellent thermal conductivity and high electrical conductivity, such as copper. Furthermore, 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. The outer shape is a flange shape, and 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 pressurized. The ion source part is threadedly matched with the accelerator PG electrode 8-1 through the ion source lower cover plate 5-6. 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 cylinder and a transmission pipeline. The type of gas source is determined by the desired ion beam, and a gas cylinder with the smallest possible volume is used to meet the narrow space requirements on the high-pressure platform. Due to the pressure of external SF6, the gas should be transmitted in the pipeline using a material with the lowest possible leakage rate. At the same time, the joints of the pipeline should meet good sealing and stability to ensure that external SF6 does not enter the pipeline and that the gas source does not leak into the external SF6 environment. Depending on the type of ions required by the experiment, hydrogen is used during device commissioning; deuterium is used when debugging parameters.

[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, you should pay attention to selecting a mass flow meter that can withstand external pressure, or take certain measures 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. By closing the metal ball valve, the mass flow meter or gas source can be quickly replaced.

[0039] The extraction and electron suppression device 8 consists 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, EG electrode 8-2, and GG electrode 8-3 require specific structural designs based on the requirements for ion beam extraction and stray electron shielding. The extraction power supply 8-6 uses a 50 kV high-voltage power supply, which is supplied to the PG electrode 8-1 via the extraction high-voltage power transmission line 4-3 for plasma extraction and acceleration. The suppression power supply 8-7 uses a -5 kV high-voltage power supply, which is supplied to the EG electrode 8-2 via the suppression power transmission line 4-2 for internal stray electron suppression. A certain voltage difference exists between the PG electrode 8-1, EG electrode 8-2, and GG electrode 8-3, requiring them to be separated by a material with sufficient insulation (such as ceramic, PEEK, epoxy, etc.). The maximum voltage difference between PG electrode 8-1 and EG electrode 8-2 is 55 kV. During the experiment, both the electrodes and the insulation material were immersed in SF6 gas. For these reasons, a 60 mm high alumina ceramic was used as the first insulating support 8-4. A 5 kV voltage difference exists between EG electrode 8-2 and GG electrode 8-3. To address installation issues, a 60 mm high alumina ceramic was used as the second insulating support.

[0040] The proton acceleration confinement transport device 9 is composed of five accelerating tubes, each with a maximum partial voltage of 500 kV. The internal electrodes of the accelerating tubes are optimized to accommodate ions of different parameters and types.

[0041] It will be easily understood by those skilled in the art that the above description is merely 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 scope of protection of the present invention.

Claims

1. A proton accelerator device for use in the preparation of 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 includes 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 includes a motor, a generator and an insulating rod, and the motor is connected to the generator through 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 includes 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 and confinement transmission device; one end of the extraction power supply high-voltage 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 the isolation transformer and the other end is used to power the equipment on the high-voltage platform of the ion source accelerator outer cavity, 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 includes a radio frequency power supply, an automatic impedance matcher, a coil, an ion source chamber, an ion source upper cover, an insulating support rod, and an ion source lower cover; the ion source chamber and the insulating support rod are arranged between the ion source upper cover and the ion source lower cover, the insulating support rod is arranged outside the ion source chamber, the ion source chamber is fixed by the connection between the insulating support rod and the ion source upper cover and the ion source lower cover, 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 extraction and electron suppression device includes a PG electrode, an EG electrode, a GG electrode, a first insulating support and a second insulating support, wherein the first insulating support is provided between the PG electrode and the EG electrode, and the second insulating support is provided between the EG electrode and the GG electrode; The accelerating confined transmission device includes 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 a photoelectric control chassis, a signal transmission optical fiber, a fiber vacuum feedthrough, and a control host. The photoelectric control chassis located on the high-voltage platform converts an analog control electrical signal into an optical signal, transmits the signal to the fiber vacuum feedthrough interface via the signal transmission optical fiber, then transmits the optical signal to the outside of the sealed steel barrel via the fiber vacuum feedthrough, and then transmits the optical signal to the photoelectric control chassis outside the steel barrel via the signal transmission optical fiber. The optical signal is converted into an electrical signal again and transmitted to the control host to achieve real-time control of equipment parameters.

3. The 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. The 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 to 10 mm.

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

7. The 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 having a thickness of more than 1 μm.

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

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