Manufacturing method of ionization chamber membrane window and ionization chamber membrane window

Abstract

The invention provides a manufacturing method of an ionization chamber membrane window and the ionization chamber membrane window, and relates to the technical field of ionization chamber radiation.The manufacturing method comprises the steps that a supporting frame is covered with a thin film, the thin film is bonded and fixed, and the thin film on the outer side of the supporting frame is removed to form an initial membrane window; the initial film window is covered with a blueprint, a position sensitive area is formed on the initial film window, and a conductive channel pattern is arranged on the blueprint; performing spraying treatment on a conductive channel pattern on the blueprint to form a conductive channel on the position sensitive area; and performing perforation conduction processing at the corresponding position of the back surface of the position sensitive area to form a plurality of contacts, and welding wires to all the contacts to form a target film window. According to the manufacturing method, the production process is simplified, the yield of ionization chamber film window production is improved, the response time of the ionization chamber film window can be shortened, and meanwhile the damage rate of the film window in use is reduced.

Description

Technical Field

[0001] The invention relates to the field of ionization chamber radiation technology, in particular to a method for manufacturing an ionization chamber membrane window and the ionization chamber membrane window. Background Art

[0002] Proton therapy, as an advanced radiotherapy method, has been widely used in the medical field this year. During the treatment process, the gas ionization chamber located in the transport line and the treatment head can monitor the patient's irradiated position and dose to ensure patient safety. The treatment head can use the incident ionization chamber to monitor the position of the proton beam at the entrance of the treatment head in real time to ensure precise control of the treatment process.

[0003] In the prior art, due to the complexity of the position sensitive area, there is still a lack of standard manufacturing and assembly methods for the ionization chamber membrane window, and the reliability and yield of the manufactured products are low. Therefore, there is room for improvement. Summary of the invention

[0004] In view of the above-mentioned shortcomings of the prior art, the purpose of the present invention is to provide a method for manufacturing an ionization chamber membrane window and an ionization chamber membrane window, so as to solve the technical problems in the prior art that the ionization chamber membrane window lacks a standard manufacturing and assembly method, and the reliability and yield of the manufactured products are low.

[0005] To achieve the above-mentioned object and other related objects, the present invention provides a method for manufacturing an ionization chamber membrane window, comprising:

[0006] Covering the film on the support frame and bonding and fixing it, removing the film outside the support frame to form an initial film window;

[0007] Covering the initial film window with a blueprint to form a position sensitive area on the initial film window, wherein the blueprint is provided with a conductive channel pattern;

[0008] Spraying the conductive channel pattern on the blueprint to form a conductive channel on the position sensitive area;

[0009] A perforation and conduction process is performed at corresponding positions on the back side of the position sensitive area to form a plurality of contacts, and wires are welded to all the contacts to form a target film window.

[0010] In one embodiment of the present invention, the step of covering the film on the support frame, bonding and fixing the film, and removing the film outside the support frame to form the initial film window includes:

[0011] Cleaning the film, and stretching the film to cover the support frame;

[0012] Cleaning the support frame and bonding the film to the support frame;

[0013] The film on the outer side of the bonding support frame is removed to form an initial film window.

[0014] In one embodiment of the present invention, the step of covering the film on the support frame, bonding and fixing the film, and removing the film outside the support frame to form the initial film window includes:

[0015] The initial film window is placed in a preset environment, and a ballast is placed on the initial film window, and the initial film window is subjected to a static treatment.

[0016] In one embodiment of the present invention, the film is a Mylar film and / or a polyethylene film.

[0017] In one embodiment of the present invention, the step of covering the blueprint on the initial film window to form a position sensitive area on the initial film window includes:

[0018] The pre-printed blueprint is covered on the initial film window, and the edge of the blueprint is fixed to the support frame using an insulating ring to form a position sensitive area, the position of which coincides with the position of the conductive channel pattern of the blueprint.

[0019] In one embodiment of the present invention, the step of spraying the conductive channel pattern on the blueprint to form a conductive channel on the position sensitive area includes:

[0020] removing the skin at the conductive channel pattern on the blueprint to form a powder coating area on the position sensitive area;

[0021] Carbon powder is sprayed in the powder coating area to form a conductive channel on the position sensitive area, and the remaining part of the skin on the blueprint is removed.

[0022] In one embodiment of the present invention, the step of spraying carbon powder in the powder coating area to form a conductive path on the position sensitive area includes:

[0023] According to a preset path, the powder coating area is sprayed with carbon powder for multiple times, and each spraying is performed after the previous carbon powder layer is dried.

[0024] In one embodiment of the present invention, the number of carbon powder layers forming the conductive channel is no less than 6 layers.

[0025] In one embodiment of the present invention, after the step of spraying the conductive channel pattern on the blueprint to form a conductive channel on the position sensitive area, the step further includes:

[0026] It is detected whether adjacent strips in the conductive channel are insulated, and whether the front and back sides of the position sensitive area are insulated. When adjacent strips in the conductive channel and the front and back sides of the position sensitive area are insulated, the position sensitive area is determined to be qualified.

[0027] The present invention also provides an ionization chamber membrane window, which is a target membrane window manufactured by any of the above-mentioned methods for manufacturing an ionization chamber membrane window.

[0028] As described above, the manufacturing method of an ionization chamber membrane window and the ionization chamber membrane window of the present invention have the following beneficial effects: the manufacturing method of the present invention also simplifies the production process and improves the yield rate of the ionization chamber membrane window production. Through the manufacturing method of the present invention, the response time of the ionization chamber membrane window can be shortened, and the breakage rate of the membrane window during use can be reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 A schematic flow chart showing a method for manufacturing an ionization chamber membrane window provided by an embodiment of the present invention;

[0030] Figure 2 Shown is a schematic diagram of a film fixing method in one embodiment of the present invention;

[0031] Figure 3 Shown is a schematic diagram of a film covering a support frame in one embodiment of the present invention;

[0032] Figure 4 Shown is a schematic structural diagram of an initial film window in one embodiment of the present invention;

[0033] Figure 5 Shown is a schematic diagram of covering a blueprint on an initial film window in one embodiment of the present invention;

[0034] Figure 6 It is a schematic diagram showing a case where the skin at the conductive channel pattern on the blueprint is removed in one embodiment of the present invention;

[0035] Figure 7 Shown is a schematic diagram of spraying carbon powder in one embodiment of the present invention;

[0036] Figure 8 A schematic diagram showing a skinning process in which the remaining portion of the blueprint is removed in accordance with an embodiment of the present invention;

[0037] Fig. 9 Shown is a schematic diagram of an insulation test in one embodiment of the present invention;

[0038] Fig.10 It is a schematic diagram showing a through-hole conduction process in a position sensitive area according to an embodiment of the present invention;

[0039] Fig.11Shown is a schematic diagram of contact welding wires according to an embodiment of the present invention.

[0040] In the figure:

[0041] 10. Support frame; 20. Position sensitive area; 21. Conductive channel; 30. Spraying path. DETAILED DESCRIPTION

[0042] The following describes the embodiments of the present invention by specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the following embodiments and features in the embodiments can be combined with each other without conflict.

[0043] It should be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present invention, and thus the drawings only show components related to the present invention rather than being drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed arbitrarily, and the component layout may also be more complicated.

[0044] In the following description, numerous details are discussed to provide a more thorough explanation of the embodiments of the present invention. However, it is obvious to those skilled in the art that the embodiments of the present invention can be implemented without these specific details. In other embodiments, well-known structures and devices are shown in the form of block diagrams rather than in detail to avoid making the embodiments of the present invention difficult to understand.

[0045] It should be noted that there is no unified standard for the assembly method of the conventional ionization chamber membrane window for proton therapy, and there is a lack of detailed descriptions of key operations such as effective positioning, fixing, bonding, and spraying. In addition, the assembly process of the ionization chamber membrane window is complicated, involving the delicate operation of multiple components, and high requirements for technical personnel. Minor operational deviations have a significant impact on the performance and safety of the equipment. Therefore, for the ionization chamber for proton therapy, the present invention provides a method for making an ionization chamber membrane window, standardizes the method for making and assembling a position sensitive area, and can be used to guide the assembly process of production operators, thereby improving the assembly accuracy, performance stability, durability, and maintainability of the ionization chamber. This will be described in detail below through specific embodiments.

[0046] See also Figure 1 The present invention provides a method for manufacturing an ionization chamber membrane window, which may include the following steps:

[0047] Step S100, covering the film on the support frame, and bonding and fixing it, removing the film outside the support frame to form an initial film window;

[0048] Step S200, covering the initial film window with a blueprint to form a position sensitive area on the initial film window, wherein the blueprint is provided with a conductive channel pattern;

[0049] Step S300, spraying the conductive channel pattern on the blueprint to form a conductive channel on the position sensitive area;

[0050] Step S400: Perform perforation and conduction processing at the corresponding position on the back of the position sensitive area to form multiple contacts, and weld wires to all contacts to form the target film window.

[0051] In one embodiment of the present invention, when executing step S100, the film is covered on the support frame and fixed by bonding, and the film outside the support frame is removed to form an initial film window. Specifically, the following steps may be included:

[0052] Step S110, cleaning the film, and stretching the film to cover the support frame;

[0053] Step S120, cleaning the support frame and bonding the film to the support frame using silicone;

[0054] Step 130 , removing the film on the outer side of the bonding support frame to form an initial film window.

[0055] See also Figure 2-4 In one embodiment of the present invention, when executing step S110 to step S130, specifically, firstly, a support frame is placed on a table, and then the film is covered on the support frame. The support frame 10 may be a frame structure made of epoxy resin material. The film may be a Mylar film and / or a polyethylene film, and its recommended size is 50cm*65cm. In this embodiment, tape or other stretching tools may be used to fix the edge of the film to ensure the flatness of the film during the production process, such as Figure 2 As shown. It should be noted that the film needs to be cleaned with ethanol before use. Then, a suitable cleaning agent and adhesive are selected to fix the film on the support frame 10. In this embodiment, pure benzene with dearomatized hydrocarbons is used to clean the support frame 10. Silicone is used as an adhesive to bond the film to the support frame 10, so that it is firmly bonded without wrinkles, ensuring the flatness of the film, such as Figure 3 Finally, the film on the outside of the support frame 10 is removed to form an initial film window, as shown in FIG. Figure 4 shown.

[0056] Furthermore, appropriate temperature, humidity and standing time can be selected to ensure the performance of the film window. In this embodiment, the temperature of the initial film window is set between 20-25°C, the humidity is set between 35-45%, and a special ballast (not less than 25 kg) is placed on the initial film window for not less than 6 hours to prevent the film window from wrinkling.

[0057] See also Figure 4 , Figure 5 In one embodiment of the present invention, when step S200 is performed, a blueprint is covered on the initial film window to form a position sensitive area on the initial film window, and a conductive channel pattern is provided on the blueprint. Specifically, a pre-printed blueprint is covered on the initial film window, and an insulating ring is used to fix the edge of the blueprint on the support frame 10, so as to form a position sensitive area 2 on the initial film window. A conductive channel pattern and a substrate pattern are provided on the blueprint. The conductive channel pattern is used to subsequently form a conductive path. The substrate pattern can be used for positioning and masking. In this embodiment, the position of the position sensitive area 20 coincides with the position of the conductive channel pattern of the blueprint.

[0058] In one embodiment of the present invention, when executing step S300, the conductive channel pattern on the blueprint is sprayed to form a conductive channel on the position sensitive area. Specifically, the following steps may be included:

[0059] Step S310, removing the skin at the conductive channel pattern on the blueprint to form a powder coating area on the position sensitive area;

[0060] Step S320: spray carbon powder in the powder coating area to form a conductive channel on the position sensitive area, and remove the remaining skin on the blueprint.

[0061] See also Figure 6 In one embodiment of the present invention, when step S310 is executed, the skin at the conductive channel pattern on the blueprint is removed to form a powder coating area on the position sensitive area. Specifically, according to the conductive channel pattern on the blueprint, use a fine needle or a cutter to carefully remove the skin in these areas. In this step, it is necessary to ensure that the removed area is clean and tidy, without any residual skin fragments, and be careful not to puncture or damage the initial film window to avoid affecting the subsequent conductive channel formation. In this embodiment, a magnifying glass or a microscope can be used to check the removed area to ensure that the skin at the conductive channel pattern is completely removed to expose the surface of the initial film window. After removing the skin at the conductive channel pattern, these areas will become the powder coating areas for subsequent spraying of carbon powder.

[0062] See also Figure 5 , Figure 7 , Figure 8In one embodiment of the present invention, when step S320 is executed, carbon powder is sprayed in the powder coating area to form a conductive channel on the position sensitive area, and the remaining skin on the blueprint is removed. Specifically, first prepare a carbon powder sprayer, ensure that the nozzle is clean and unblocked, and adjust the parameters of the sprayer to ensure that the spraying is uniform and does not flow. Then, in an environment with heating and ventilation facilities, aim the carbon powder sprayer at the powder coating area, and the spraying environment temperature can be set between 25-30°C. According to the preset spraying path 30, such as a serpentine line, at least 6 layers of carbon powder are evenly sprayed, and the spraying time of each layer does not exceed 3 seconds to ensure that the carbon powder is evenly covered without omission or accumulation, thereby forming a conductive channel 21 on the position sensitive area 20. It should be noted that during the spraying process, it is necessary to wait for each layer of carbon powder to dry before spraying the next layer according to the recommended time on the spray container to ensure that the carbon powder is fully dried to avoid carbon powder falling off or flowing in subsequent operations. Finally, use a fine needle or cutter to carefully remove the skin at the substrate pattern on the blueprint. Make sure the skin at the substrate pattern is completely removed to expose the surface of the initial film window. Be careful not to puncture or damage the conductive path that has been sprayed with carbon powder. After removing the skin of the substrate pattern, the conductive path will be completely exposed on the initial film window to form the final conductive path.

[0063] See also Fig. 9 , further, first, use a magnifying glass or microscope to check the integrity and uniformity of the conductive path, ensure that the area covered by the carbon powder is not missing or damaged, and the conductive path is clearly visible. Then, use a multimeter to check whether the adjacent strips in the conductive path are insulated, whether the front and back of the initial film window are insulated, so as to detect whether there are leaks in the conductive path and whether the insulation is good. If the above test parts are all insulated, it can be determined that the position sensitive area is qualified.

[0064] See also Fig.10 , Fig.11In one embodiment of the present invention, when step S400 is executed, a perforation conduction process is performed at the corresponding position on the back of the position sensitive area to form a plurality of contacts, and wires are welded to all the contacts to form a target film window. Specifically, first, according to the conductive channel pattern on the blueprint, the position to be perforated is marked at the corresponding position on the back of the position sensitive area, and it is ensured that the marked position corresponds to the lead-out point of the conductive channel one by one. Then, a fine needle or a drilling tool is used to perforate at the marked position, and it is necessary to ensure that the perforation depth clock penetrates the film window but does not damage the conductive channel. Check each perforation to ensure that it is unobstructed. After the perforation is completed, a contact will be formed at each perforation for subsequent wire welding. Then, a binary conductive glue is used to fix one end of the wire on the contact. In this step, it is necessary to ensure that the solder joint is smooth and has no jagged edges, the welding is firm and the conductivity is reliable. Repeat this step for all contacts to ensure that each contact is connected to a wire. After all contacts are welded, a plurality of contacts will be formed at the corresponding position on the back of the position sensitive area, and each contact is connected to a wire. These wires will be used to connect other components of the ionization chamber to form the final target membrane window.

[0065] Furthermore, each solder joint can be checked with a magnifying glass or microscope to ensure that there are no defects in the solder joint and the wire connection is reliable. Use a multimeter to check the continuity between each contact to ensure that there is no short circuit or open circuit.

[0066] The present invention also provides an ionization chamber membrane window. In radiotherapy, the ionization chamber membrane window of the present invention can be located in the gas ionization chamber of the transport line and the treatment head, so that the irradiated position and dose of the patient can be monitored, thereby ensuring the safety of the patient. The ionization chamber membrane window of the present invention can be the target membrane window manufactured by the manufacturing method of the ionization chamber membrane window in any of the above embodiments.

[0067] In summary, the present invention discloses a method for manufacturing an ionization chamber membrane window and an ionization chamber membrane window. The ionization chamber membrane window produced by the manufacturing method of the present invention has an extremely fast response time. For example, in a working environment of a proton beam of 0-60nA, the ionization chamber membrane window of the present invention can accurately detect the beam position when there is a beam, and its fastest response time is less than or equal to 200μs, and there is no breakdown phenomenon under a high voltage of 3kV. In the prior art, under standard working conditions (i.e., an average of 50nA*12 hours per day), the abnormal breakage rate of the ionization chamber membrane window produced by the prior art is about 15% per year. The ionization chamber membrane window produced by the manufacturing method of the present invention can reduce the membrane window breakage rate in the first year to 5% per year. In addition, the manufacturing method of the present invention also simplifies the production process and improves the yield rate. Therefore, the present invention effectively overcomes the various shortcomings of the prior art and has a high industrial utilization value.

[0068] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed by the present invention shall still be covered by the claims of the present invention.

Claims

1. A method for manufacturing an ionization chamber membrane window, characterized in that: include: Covering the film on the support frame and bonding and fixing it, removing the film outside the support frame to form an initial film window; Covering the initial film window with a blueprint to form a position sensitive area on the initial film window, wherein the blueprint is provided with a conductive channel pattern; Spraying the conductive channel pattern on the blueprint to form a conductive channel on the position sensitive area; A perforation and conduction process is performed at corresponding positions on the back side of the position sensitive area to form a plurality of contacts, and wires are welded to all the contacts to form a target film window.

2. The method for manufacturing an ionization chamber membrane window according to claim 1, characterized in that: The steps of covering the film on the support frame, bonding and fixing the film, and removing the film outside the support frame to form an initial film window include: Cleaning the film, and stretching the film to cover the support frame; Cleaning the support frame and bonding the film to the support frame; The film on the outer side of the bonding support frame is removed to form an initial film window.

3. The method for manufacturing an ionization chamber membrane window according to claim 1, characterized in that: The step of covering the film on the support frame, bonding and fixing the film, and removing the film outside the support frame to form an initial film window includes: The initial film window is placed in a preset environment, and a ballast is placed on the initial film window, and the initial film window is subjected to a static treatment.

4. The method for manufacturing an ionization chamber membrane window according to claim 1, characterized in that: The film is a Mylar film and / or a polyethylene film.

5. The method for manufacturing an ionization chamber membrane window according to claim 1, characterized in that: The step of covering the blueprint on the initial film window to form a position sensitive area on the initial film window includes: The pre-printed blueprint is covered on the initial film window, and the edge of the blueprint is fixed to the support frame using an insulating ring to form a position sensitive area, the position of which coincides with the position of the conductive channel pattern of the blueprint.

6. The method for manufacturing an ionization chamber membrane window according to claim 1, characterized in that: The step of spraying the conductive channel pattern on the blueprint to form a conductive channel on the position sensitive area includes: removing the skin at the conductive channel pattern on the blueprint to form a powder coating area on the position sensitive area; Carbon powder is sprayed in the powder coating area to form a conductive channel on the position sensitive area, and the remaining skin on the blueprint is removed.

7. The method for manufacturing an ionization chamber membrane window according to claim 6, characterized in that: The step of spraying carbon powder in the powder coating area to form a conductive path on the position sensitive area includes: According to a preset path, the powder coating area is sprayed with carbon powder for multiple times, and each spraying is performed after the previous carbon powder layer is dried.

8. The method for manufacturing an ionization chamber membrane window according to claim 7, characterized in that: The number of carbon powder layers forming the conductive path is no less than 6 layers.

9. The method for manufacturing an ionization chamber membrane window according to claim 7, characterized in that: After the step of spraying the conductive channel pattern on the blueprint to form a conductive channel on the position sensitive area, the step further includes: It is detected whether adjacent strips in the conductive channel are insulated, and whether the front and back sides of the position sensitive area are insulated. When adjacent strips in the conductive channel and the front and back sides of the position sensitive area are insulated, the position sensitive area is determined to be qualified.

10. An ionization chamber membrane window, characterized in that: The ionization chamber membrane window is a target membrane window manufactured by the method for manufacturing an ionization chamber membrane window according to any one of claims 1-9.

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