Manual flushing method for gamma-ray negative film

Abstract

The invention relates to a manual washing method of a gamma-ray negative film, which comprises the steps of developing, stopping developing, fixing, washing and drying, the film washing quality is improved through fine control of each step, and various unstable factors in the washing process are effectively eradicated. And the film review result is prevented from being influenced by poor washing quality such as spots generated by developing and fixing and water marks and indentations generated in each step. According to the manual flushing method for the gamma-ray negative film, the negative film flushing cost is greatly saved, and compared with an automatic flushing machine, the cost is saved by more than 2 / 3; especially for washing operation of a small number of negative films, waste of automatic washing starting, maintenance and the like is avoided. The manual washing method for the gamma-ray negative film can be implemented by using the simple film washing device, and the device and the liquid medicine for film washing are easy to store and carry, even can be temporarily self-made, and are suitable for field and outdoor operation.

Description

Technical Field

[0001] The invention relates to the technical field of nondestructive testing, in particular to a manual washing method for a gamma-ray film. Background Art

[0002] Nondestructive testing (NDT) is to detect internal and surface defects of various engineering materials, parts, structural parts and complete products by utilizing the changes in the response to sound, light, electricity, magnetism and heat caused by structural abnormalities or defects in the material without damaging the performance of the object being tested, and to make judgments and evaluations on the type, nature, quantity, shape, location, size, distribution and changes of defects. Among them, radiation detection utilizes the attenuation characteristics of radiation when it propagates in the medium. When uniform-intensity radiation penetrates the workpiece to be tested, the intensity of the radiation after passing through the workpiece to be tested will be uneven due to the different attenuation characteristics of the defects and the matrix material of the workpiece to be tested. By using methods such as film photosensitization to detect the intensity of the radiation after passing through the workpiece to be tested, it can be determined whether there are defects in the workpiece to be tested that cause changes in the intensity of the transmitted radiation.

[0003] Only after being washed can the gamma-ray film show the defect image of the workpiece. At present, the film washing of the radiographic detection is often completed by automatic film washing machines. However, automatic film washing machines and their supporting developer and fixer are expensive and not suitable for washing a small amount of film. There are many uncontrollable factors in automatic film washing, and the quality of film washing is difficult to guarantee, and even pseudo defects may occur, which seriously affects the film review results. In addition, automatic film washing machines are large in size and inconvenient to move, making it difficult to carry out film washing operations in the field environment. Summary of the invention

[0004] Based on this, it is necessary to provide a manual processing method for gamma-ray films to address the technical problems of high prices of automatic film processors, unstable film processing quality, and difficulty in field processing operations.

[0005] In order to solve the above problems, the present invention adopts the following technical solutions:

[0006] The embodiment of the present invention discloses a manual developing method for a gamma-ray film, comprising the steps of developing, stopping developing, fixing, washing and drying. For developing, the film is immersed in a developing solution for 4 to 6 minutes. The film is continuously and slightly swung within 1 minute of the developing immersion time, and the film is slightly swung at intervals after 1 minute. For stopping developing, the film is lifted from the developing solution, immersed in water after 2 seconds, and continuously and slightly swung for 1 to 2 minutes. For fixing, the film is lifted from the water, immersed in a fixing solution after 2 seconds for 15 to 20 minutes. The film is continuously swung within 0.5 minute of the fixing immersion time, and the film is slightly swung at intervals after 0.5 minutes. For washing, the film is lifted from the fixing solution and placed in running water for washing for 15 to 30 minutes. For drying, the washed film is aired or dried.

[0007] In one embodiment, the film is soaked in water before the developing step.

[0008] In one of the embodiments, the developer is prepared by diluting a developer kit, and the dilution ratio is developer kit: water = 1:3; the developer kit, calculated by mass percentage, includes: 65% to 75% water, 5% to 10% hydroquinone, 1% to 5% potassium carbonate, and 15% to 20% potassium sulfite.

[0009] In one embodiment, the method for diluting the developer comprises the following steps:

[0010] S101, measure 2 parts of water and pour them into a developer dilution vessel;

[0011] S102, adding one portion of the developer kit to the developer dilution container, and slowly stirring in the same direction until the developer kit is fully dissolved;

[0012] S103, continue to add 1 part of water to the developer dilution container, and stir slowly in the same direction until the developer is uniform.

[0013] In one of the embodiments, the fixing solution is prepared by diluting a fixing chemical, and the dilution ratio is fixing chemical: water = 1:3; the fixing chemical, calculated by mass percentage, includes: 45% to 55% water, 30% to 40% ammonium thiosulfate, 1% to 3% aluminum sulfate, and 1% to 2% sodium tetraborate.

[0014] In one embodiment, the dilution method of the fixing solution comprises the following steps:

[0015] S201, measure 2 parts of water and pour them into a fixing solution dilution vessel;

[0016] S202, adding one portion of the fixing solution to the fixing solution dilution container, and slowly stirring in the same direction until the fixing solution is fully dissolved;

[0017] S203, continue to add 1 part of water to the fixing solution dilution container, and stir slowly in the same direction until the fixing solution is uniform.

[0018] In one embodiment, a simple film washing device is used for manual washing; the simple film washing device includes a developing tank, a stop tank, a fixing tank and a washing tank which are arranged in sequence and at intervals, and a water supply structure is arranged in the washing tank.

[0019] In one embodiment, the simple film washing device is made of plastic steel or cement.

[0020] In one embodiment, in the drying step, the film is soaked with a detergent aqueous solution and then air-dried or baked.

[0021] In one embodiment, the manual flushing operation is performed in a light-proof environment.

[0022] The technical solution adopted by the present invention can achieve the following beneficial effects:

[0023] The manual developing method of gamma-ray film disclosed in the present invention greatly saves the film developing cost, and saves more than 2 / 3 of the cost compared with an automatic developing machine; especially for the developing operation of a small amount of film, it avoids the waste of resources such as starting up and maintaining the automatic developing equipment.

[0024] The manual developing method of gamma-ray film disclosed in the present invention improves the film developing quality through fine control of each step, effectively eliminates various unstable factors in the developing process, and avoids the film review results being affected by developing and fixing spots and water marks, pressure marks and other developing defects in each step; the manual developing method of gamma-ray film disclosed in the present invention effectively improves the clarity, sensitivity and contrast of the film, so that the film meets the relevant quality standards such as ASNT, DINEN, FB, ISO and the like.

[0025] The manual developing method of the gamma-ray film disclosed by the invention can be implemented by using a simple film developing device. The device and the liquid used for developing the film are easy to store and carry, and can even be temporarily made by oneself, so as to be suitable for field and outdoor operations. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a structural schematic diagram of a simple film developing device disclosed in an embodiment of the present invention;

[0027] Description of reference numerals:

[0028] 100-developer tank, 200-stop tank, 300-fixer tank, 400-washing tank. DETAILED DESCRIPTION

[0029] In order to facilitate the understanding of the present invention, the present invention will be described more fully below with reference to the relevant drawings. The preferred embodiments of the present invention are given in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thoroughly understood.

[0030] It should be noted that when an element is referred to as being "disposed on" another element, it may be directly on the other element or there may be a centered element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a centered element at the same time. The terms "vertical", "horizontal", "left", "right", "top", "bottom", "bottom end", "top end" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0031] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0032] The embodiment of the present invention discloses a manual washing method for gamma-ray film, including liquid preparation and manual washing operation, wherein the liquid preparation includes the preparation of developer and fixer, and the manual washing operation includes a developing step, a stop step, a fixing step, a washing step and a drying step. In the embodiment disclosed by the present invention, a simple film washing device can be used for manual washing operation, such as Figure 1 As shown, the simple film washing device is a film washing tank with an opening at the top, and three partitions divide the film washing tank into a developing tank 100, a stop display tank 200, a fixing tank 300 and a washing tank 400. The developer 100 is added with a configured developer for implementing the developing operation; the stop display tank 200 is added with clean water for implementing the stop display operation; the fixing tank 300 is added with a configured fixing solution for implementing the fixing operation; the washing tank 400 is provided with a water supply part (not shown in the figure) for supplying flowing clean water for implementing the washing operation. The water supply part can be a faucet connected to a water supply system or a water kettle filled with clean water. The simple film washing device disclosed in this embodiment can be made of plastic steel or cement, does not react with the liquid medicine and is durable. The size of each operation tank can be customized according to the size of the film, and the washing operation can be implemented without power supply, which is suitable for field operations. Of course, the simple film washing device can also be made of other materials that do not react with the liquid medicine of the present invention, and the embodiment of the present invention does not make specific restrictions on this. In addition, when it is inconvenient to manufacture the simple film processing device in the field, a plurality of plastic open containers may be used to replace the film processing device to implement the various steps of the manual washing operation, and the embodiment of the present invention does not impose any specific limitation on this.

[0033] It should be noted that, whether outdoors or indoors, all steps of the manual rinsing operation except the final water washing and drying need to be carried out in a dark room away from light; a dark room needs to be set up in the testing room, and a light-proof area simulating a dark room needs to be built in the wild.

[0034] In the embodiments disclosed in the present invention, the developer configuration includes the configuration of the developer kit and the dilution of the developer kit. The developer kit includes, by mass percentage, 65% to 75% water, 5% to 10% hydroquinone, 1% to 5% potassium carbonate and 15% to 20% potassium sulfite; the developer kit can be prepared by weighing each component and mixing them evenly. The developer kit can be prepared by diluting the developer kit with water in a ratio of 1:3. It should be noted that after the developer is configured, it needs to be contained in a sealed, light-shielding container to prevent oxidation of the developer. Preferably, the developer is sealed and light-shielded for 24 hours before use.

[0035] In this embodiment, the dilution and configuration method of the developer may include the following steps:

[0036] S101. Measure 30L of water and pour it into a developer dilution vessel; the developer dilution vessel is made of non-metallic material to prevent it from reacting with the developer kit.

[0037] S102, continue to uniformly add 15L of developer kit into the developer dilution vessel, and stir slowly in the same direction until the developer kit is fully dissolved in the water;

[0038] S103, continue to add 15L of water into the developer dilution vessel at a uniform speed, and stir slowly in the same direction until the developer is evenly mixed.

[0039] It should be noted that during the dilution process, the temperature of the solution in the developer dilution vessel should be controlled within the range of 10°C to 30°C.

[0040] Preferably, the stirring directions of S102 and S103 are the same.

[0041] In the embodiments disclosed in the present invention, the fixing solution configuration includes the configuration of the fixing set and the dilution of the fixing set. The fixing set includes, by mass percentage, 45% to 55% water, 30% to 40% ammonium thiosulfate, 1% to 3% aluminum sulfate and 1% to 2% sodium tetraborate; the fixing set can be obtained by weighing each component and mixing them evenly. The fixing set can be obtained by diluting the fixing set with water in a ratio of 1:3. It should be noted that after the fixing solution is configured, it needs to be contained in a sealed and light-shielded container to prevent the fixing solution from being oxidized. Preferably, the fixing solution is sealed and light-shielded for 24 hours before use.

[0042] In this embodiment, the dilution and configuration method of the fixing solution may include the following steps:

[0043] S201. Measure 30L of water and pour it into a fixing solution dilution vessel; the fixing solution dilution vessel is made of non-metallic material to prevent it from reacting with the fixing solution.

[0044] S202, continue to uniformly add 15L of fixing solution into the fixing solution dilution vessel, and stir slowly in the same direction until the fixing solution is fully dissolved in the water;

[0045] S203, continue to add 15L of water into the fixing solution dilution container at a uniform speed, and stir slowly in the same direction until the fixing solution is evenly mixed.

[0046] It should be noted that in order to prevent the formation of aluminum hydroxide precipitates during the preparation of the fixing solution, the dilution and preparation should be strictly carried out in the above order; and during the dilution and preparation process, the solution temperature in the fixing solution dilution vessel should be controlled within the range of 10°C to 30°C.

[0047] Preferably, the stirring directions of S202 and S203 are the same.

[0048] The steps of the manual washing operation of the present invention are described in detail by taking the manual washing of AGFA film as an example. If the AGFA film after transillumination is not developed in time, latent image decay will occur. Therefore, the AGFA film after transillumination should be washed as soon as possible, and the longest storage time should not exceed 8 hours. When using multiple transillumination films, each film should be washed at the same time to avoid density value deviation.

[0049] Specifically, the manual flushing operation may include the following steps:

[0050] S301, soaking

[0051] Before development, soak the transilluminated AGFA film in clean water to avoid uneven development caused by bubbles on the surface of the dry film during the subsequent development process, which will further cause pseudo defects.

[0052] S302, Development

[0053] Soak the wet film in a developing tank 100 with developer; within the initial 1 minute of soaking, the film should be gently shaken up and down and left and right to ensure that the film is evenly replenished with developer to improve contrast; after soaking for 1 minute, the film should be gently shaken at intervals of about 1 minute, and shaken several times every 1 minute. The operating temperature of the developing process should be controlled between 18℃ and 24℃, and the operating time should be controlled within 4min to 6min. The main function of the developing process is to reduce the sensitized silver halide to metallic silver. If the developing time is too long, the film's blackness and contrast will increase, but the image grain and gray fog will also increase; if the developing time is too short, the blackness and contrast will be insufficient.

[0054] S303, stop display

[0055] The stop operation can remove the residual developer on the film to avoid pseudo defects on the film; the stop operation can also prevent the film with residual developer from entering the fixer and contaminating the fixer, which affects the quality of subsequent fixation. After the developed film is taken out of the developing tank 100, since there is still residual developer on the surface of the film, the development reaction on the surface of the film is still continuing. Most of the residual developer is slightly drained off, and after 2 seconds, the film is immersed in the stop tank 200 with clean water, and it is gently shaken for 1min to 2min to remove the remaining residual developer. The stop operation is performed at room temperature.

[0056] S304, Fixing

[0057] After the film is developed, most of the silver halide in the emulsion layer is not reduced to metallic silver. These silver halides must be removed from the emulsion layer in order to fix the image formed by the development. This process is called fixing. During the fixing process, the phenomenon that the milky yellow color of the film emulsion film disappears and becomes transparent is called "transparency". The period from the film being placed in the fixing solution until it becomes transparent is called "transparency time". The occurrence of the transparency phenomenon means that the undeveloped silver halide in the film emulsion layer has been dissolved by the fixing agent, but additional time is required for the dissolved silver salt to seep out of the emulsion layer into the fixing solution. Therefore, the fixing time should be significantly longer than the transparency time. In this embodiment, the fixing time is more than twice the transparency time.

[0058] After the film is taken out of the stop tank 200, drain the water slightly and soak it in the fixing tank 300 with fixing solution after 2 seconds. During the initial 0.5 minutes of fixing soaking, the film should be gently shaken up and down and left and right to ensure that the film is fully and evenly fixed; after soaking for 0.5 minutes, the film should be gently shaken at intervals. Depending on the aging degree of the liquid, the interval time can be 2 minutes to 3 minutes, and the film should be shaken several times every 2 minutes to 3 minutes. The fixing soaking operation temperature should be controlled within the range of 16°C to 24°C, and the fixing soaking time should be more than twice the permeation time. However, the fixing solution will become ineffective after the fixing soaking time exceeds 20 minutes. Therefore, the fixing soaking time is preferably 15 minutes to 20 minutes.

[0059] S305, water washing

[0060] After fixing is completed, the film is placed in the washing tank 400 or under the faucet, and the film is washed with running water. The washing water flow rate should be slow, the washing water temperature should be room temperature, and the washing time should not be too long to prevent the film film from falling off and affecting the subsequent review results. The washing time is preferably 15 minutes to 30 minutes.

[0061] S306, Drying

[0062] Air dry or tumble dry the washed film.

[0063] Preferably, in order to prevent the film from generating water marks during the drying or air-drying process and thus affecting the subsequent review results, the film can be soaked in a detergent aqueous solution before air-drying or air-drying. The concentration of the detergent aqueous solution is preferably less than 1%.

[0064] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A method for manually developing a gamma-ray film, characterized in that: It includes developing, stopping, fixing, washing and drying steps; Development: Soak the film in the developer for 4 to 6 minutes; within 1 minute of the soaking time, gently shake the film continuously, and after 1 minute, gently shake the film at intervals; Stop the development, lift the film from the developer, immerse it in water after 2 seconds, and continue to shake it gently for 1 minute to 2 minutes; Fixing: lift the film from the water and soak it in the fixing solution for 15 to 20 minutes after 2 seconds. The film should be shaken continuously within 0.5 minutes of the fixing soaking time, and the film should be shaken slightly after 0.5 minutes. Washing: lift the film from the fixer and place it in running water for 15 to 30 minutes; Drying: hang the washed film to dry or tumble dry.

2. The manual processing method of gamma-ray film according to claim 1, characterized in that: Prior to the development step, the film is soaked in water.

3. The manual processing method of gamma-ray film according to claim 1, characterized in that: The developer is prepared by diluting the developer kit, and the dilution ratio is developer kit: water = 1:3; The developing drug set comprises, by weight percentage, 65% to 75% water, 5% to 10% hydroquinone, 1% to 5% potassium carbonate, and 15% to 20% potassium sulfite.

4. The manual processing method of gamma-ray film according to claim 3, characterized in that: The developer dilution method comprises the following steps: S101, measure 2 parts of water and pour them into a developer dilution vessel; S102, adding one portion of the developer kit to the developer dilution container, and slowly stirring in the same direction until the developer kit is fully dissolved; S103, continue to add 1 part of water to the developer dilution container, and stir slowly in the same direction until the developer is uniform.

5. The manual processing method of gamma-ray film according to claim 1, characterized in that: The fixing solution is prepared by diluting the fixing agent, and the dilution ratio is fixing agent: water = 1:3; The fixing medicine comprises, by weight percentage, 45% to 55% water, 30% to 40% ammonium thiosulfate, 1% to 3% aluminum sulfate, and 1% to 2% sodium tetraborate.

6. The manual processing method of gamma-ray film according to claim 5, characterized in that: The dilution method of the fixing solution comprises the following steps: S201, measure 2 parts of water and pour them into a fixing solution dilution vessel; S202, adding one portion of the fixing solution to the fixing solution dilution container, and slowly stirring in the same direction until the fixing solution is fully dissolved; S203, continue to add 1 part of water to the fixing solution dilution container, and stir slowly in the same direction until the fixing solution is uniform.

7. The manual processing method of gamma-ray film according to claim 1, characterized in that: Manual washing using a simple film washing device; The simple film washing device comprises a developing tank, a stop tank, a fixing tank and a washing tank which are arranged in sequence and at intervals, and a water supply structure is arranged in the washing tank.

8. The manual processing method of gamma-ray film according to claim 7, characterized in that: The simple film washing device is made of plastic steel or cement.

9. The manual processing method of gamma-ray film according to claim 1, characterized in that: In the drying step, the film is soaked with a detergent aqueous solution and then air-dried or baked.

10. The manual processing method of gamma-ray film according to any one of claims 1 to 9, characterized in that: Perform manual flushing in a dark environment.

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