A radioactive sample processing system, working tube and processing method

Abstract

The present application discloses a radioactive sample processing system, including a gas supply device, a combustion device, a collecting device and a control device, wherein the gas supply device has at least one gas supply channel, the combustion device includes a combustion furnace and a working tube arranged in the combustion furnace, the combustion furnace has at least two combustion channels connected to the gas supply channel, each combustion channel is provided with the working tube, each working tube is used to place the radioactive sample, the collecting device has a collecting channel connected to each combustion channel, each collecting channel is used to collect the radioactive material after the radioactive sample in the corresponding working tube is burned, and the control device is respectively connected to the gas supply device and the combustion furnace signal, and is used to control the gas supply flow of the gas supply device and the temperature in the combustion furnace. The present application can process multiple groups of radioactive samples, improves efficiency, and one type of sample uses one combustion channel and a corresponding connected collecting channel, which reduces cross contamination when processing samples of different activities.

Description

Technical Field

[0001] The present application relates to the technical field of radioactive sample processing, and in particular to a radioactive sample processing system, a working tube and a processing method. Background Art

[0002] During the operation and decommissioning of nuclear facilities such as nuclear power plants, accelerators and nuclear fuel reprocessing plants, tritium and carbon-14 in biological samples need to be monitored in accordance with the requirements of radiation environment monitoring.

[0003] In the related art, the processing and extraction device of tritium and carbon-14 mainly adopts the oxidation combustion method. After the biological sample is taken back, it is freeze-dried, and the tritium and carbon-14 are extracted by the tritium and carbon-14 extraction device, and the absorbed water and CO2 are converted for measurement; after the biological sample is taken back, it is dried by equipment such as an oven, and after the inorganic water is extracted, the tritium and carbon-14 are extracted by the tritium and carbon-14 extraction device. However, in the related art, only one type of sample (high activity or low activity sample) can be processed at a time, and cross contamination may occur when high activity and low activity samples are processed twice. Summary of the invention

[0004] In view of this, the embodiments of the present application hope to provide a radioactive sample processing system, a working tube and a processing method to solve the cross-contamination problem during multiple sample processing.

[0005] To achieve the above purpose, the technical solution of the embodiment of the present application is implemented as follows:

[0006] In a first aspect of the present application, a radioactive sample processing system is provided, comprising:

[0007] An air supply device having at least one air supply channel;

[0008] A combustion device, comprising a combustion furnace and a working tube arranged in the combustion furnace, wherein the combustion furnace has at least two combustion channels connected to the gas supply channel, each of the combustion channels is provided with the working tube, and each of the working tubes is used to place a radioactive sample;

[0009] a collecting device, comprising a collecting channel connected to each of the combustion channels, each of the collecting channels being used to collect radioactive substances after the radioactive sample in the corresponding working tube is burned; and

[0010] The control device is respectively connected to the gas supply device and the combustion furnace by signals, and is used to control the gas supply flow of the gas supply device and the temperature in the combustion furnace.

[0011] Furthermore, the air supply device comprises:

[0012] Gas supply container, used for supplying gas;

[0013] a pressure reducing valve connected to the gas supply container;

[0014] a purification unit connected to the pressure reducing valve to purify the gas delivered by the gas supply container; and

[0015] A flow controller connected to the purification unit, wherein the control device is connected to the flow controller by signal, and is used to control the flow rate of gas delivered to each of the combustion channels respectively;

[0016] The gas supply channel includes a common channel and a diversion channel. The gas supply container, the pressure reducing valve and the purification unit are connected to form the common channel. Each diversion channel connects the common channel and the corresponding combustion channel. Each diversion channel is provided with the flow controller.

[0017] Furthermore, there are at least two air supply channels, and the air supply device further comprises:

[0018] A mixing container, each of the combustion channels is connected to a corresponding mixing container, and each of the air supply channels is connected to the mixing container, so that the gas in each of the air supply channels is mixed and then delivered to the corresponding combustion channel.

[0019] Furthermore, the combustion device also includes:

[0020] A pressure fluctuation suppression container is provided in each combustion channel, one end of the pressure fluctuation suppression container is connected to the air supply device, and the other end is connected to the corresponding working pipe, and the pressure fluctuation suppression container is used to suppress the instantaneous airflow pressure generated by the working pipe.

[0021] Furthermore, the pressure fluctuation suppression container is a docking and detachable cavity structure.

[0022] Furthermore, the combustion furnace comprises:

[0023] Furnace cover;

[0024] A base, forming at least two independently arranged furnaces, each of which is provided with a working tube, and the furnace cover is openably and closably arranged on the base;

[0025] a heating element, disposed on the furnace, for heating the working tube; and

[0026] The temperature controller is used to adjust the heating power of the heating element and monitor the temperature in the furnace. The control device is connected to the temperature controller signal to control the temperature in the furnace.

[0027] Furthermore, the heating element is in the shape of a tile and is arranged up and down on the inner wall of the furnace, and the working tube is fitted with the tile-shaped heating element.

[0028] Furthermore, the collecting device includes a collecting module and a drying module, each collecting channel is provided with at least one group of the collecting module and the drying module, the collecting module is connected with the drying module, the drying module is located downstream of the collecting module, and is used to dry the moisture in the gas of the collecting module.

[0029] Furthermore, the collecting device comprises a second check valve disposed between two adjacent groups of the collecting modules and the drying modules, one end of the second check valve being connected to the drying module of the upstream group, and the other end being connected to the collecting module of the downstream group.

[0030] Furthermore, the collection device includes a weighing sensor component, which is arranged on the collection module and the drying module. The control device is connected to the weighing sensor component signal to obtain the mass or weight of the radioactive material to generate a time-mass / weight coordinate progress trend curve.

[0031] Furthermore, the processing system includes a first check valve, and the first check valve is arranged between adjacent gas supply devices, combustion devices and collection devices, as well as downstream of the collection device, so that the gas can flow through the gas supply channel, the combustion channel and the collection channel in sequence in one direction and then be discharged.

[0032] Furthermore, the processing system includes a negative pressure exhaust hood with an exhaust port, which is arranged outside the combustion device and the collection device and is used to create an internal negative pressure environment for exhaust.

[0033] In a second aspect of the present application, a working tube for a radioactive sample is provided, which is used in the above-mentioned processing system, comprising:

[0034] A first working tube, used for placing a radioactive sample, one end of the first working tube being connected to the gas supply device; and

[0035] The second working tube is used for placing the catalyst, the other end of the first working tube is detachably connected to one end of the second working tube, and the other end of the second working tube is connected to the collecting device.

[0036] Furthermore, the first working tube includes a first filter assembly and a second filter assembly. The first filter assembly is arranged on a side of the first working tube close to the air supply device, and is used to suppress large particle combustion products from flowing back into the air supply device during combustion; the second filter assembly is arranged on a side of the first working tube close to the second working tube, and is used to suppress large particle combustion products from entering the second working tube during combustion.

[0037] Furthermore, the caliber of one end of the first working tube is smaller than that of the other end, which is used to limit the position of the radioactive sample; the caliber of one end of the second working tube is smaller than that of the other end, which is used to limit the position of the catalyst.

[0038] In a third aspect of the present application, a method for processing a radioactive sample is provided, which is applied to the above-mentioned processing system, and the processing method comprises:

[0039] Opening the gas supply device to supply gas to each of the combustion channels to be processed in the combustion device;

[0040] Setting preset parameters corresponding to the gas supply device and each of the combustion channels in the control program of the control device, and generating a time-mass / weight coordinate progress trend curve of each of the collection channels of the collection device;

[0041] Running the control program until each of the progress trend curves reaches a level, the curve fluctuation is within a preset value range and the duration meets the set duration parameter;

[0042] The control program is stopped, combustion and heating of the combustion device are stopped, and the gas supply of the gas supply device is turned off.

[0043] The radioactive sample processing system provided in the embodiment of the present application comprises a gas supply device having at least one gas supply channel, a combustion device including a combustion furnace and a working tube arranged in the combustion furnace, the combustion furnace having at least two combustion channels connected to the gas supply channel, each combustion channel being provided with a working tube, each working tube being used to place a radioactive sample, a collecting device having a collecting channel connected to each combustion channel, each collecting channel being used to collect radioactive substances after the radioactive sample in the corresponding working tube is burned, and a control device being respectively connected to the gas supply device combustion furnace signal, for controlling the gas supply flow of the gas supply device and controlling the temperature in the combustion furnace. The present application processes multiple groups of radioactive samples through at least two independent combustion channels and corresponding connected collection channels, thereby improving efficiency, and one type of sample uses one combustion channel and a corresponding connected collection channel, thereby reducing cross contamination when processing samples of different activities.

[0044] The working tube for radioactive samples provided in the embodiment of the present application divides the traditional integrated working tube structure into two detachable parts. The first working tube is used to place the radioactive sample, and the second working tube is used to place the catalyst. It is easy to disassemble and clean after the combustion reaction, and easy to replace if one of them is broken, thereby reducing the replacement cost.

[0045] The method for processing radioactive samples provided in the embodiment of the present application is to start the gas supply device to supply gas to each combustion channel to be processed in the combustion device, set the preset parameters corresponding to the gas supply device and each combustion channel in the control program of the control device, generate the time-mass / weight coordinate progress trend curve of each collection channel of the collection device, run the control program until each progress trend curve reaches a level and no longer changes, and the duration meets the set duration parameter, stop running the control program, turn off the gas supply of the gas supply device, and stop the combustion and heating of the combustion device. The present application sets the heating temperature rise curve and the time-mass / weight coordinate progress trend curve through the control program, controls the gas supply device and the combustion device, realizes the automatic control of the entire process, and improves the work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] Figure 1 A schematic diagram of the structure of a radioactive sample processing system provided in an embodiment of the present application;

[0047] Figure 2 A schematic diagram of the structure of another radioactive sample processing system provided in an embodiment of the present application, wherein a control system is not shown;

[0048] Figure 3 A schematic diagram of the structure of a working tube for radioactive samples provided in an embodiment of the present application;

[0049] Figure 4 A schematic flow chart of a method for processing a radioactive sample provided in an embodiment of the present application.

[0050] Description of Reference Numerals

[0051] Gas supply device 1; gas supply channel 1a; common channel 1a'; diversion channel 1a"; gas supply container 11; pressure reducing valve 12; purification unit 13; flow controller 14; mixing container 15; combustion device 2; combustion channel 2a; combustion furnace 21; furnace cover 211; base 212; furnace chamber 212a; heating element 213; temperature controller 214; working tube 22; first working tube 221; first filter assembly 2211; second filter assembly 2212; second working tube 222; pressure fluctuation suppression container 23; collecting device 3; collecting channel 3a; collecting module 31; drying module 32; second check valve 33; weighing sensor assembly 34; control device 4; first check valve 5; negative pressure exhaust hood 6; exhaust port 6a; sample boat 7; catalyst 8. DETAILED DESCRIPTION

[0052] It should be noted that, in the absence of conflict, the embodiments and technical features in the embodiments of the present application can be combined with each other, and the detailed description in the specific implementation method should be understood as an explanation of the purpose of the present application and should not be regarded as an improper limitation on the present application.

[0053] The present application is further described in detail below in conjunction with the accompanying drawings and specific embodiments. The descriptions of "first", "second", etc. in the embodiments of the present application are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly including at least one feature. In the description of the embodiments of the present application, the meaning of "multiple" is at least two, that is, including two and more than two, such as two or three, unless otherwise clearly and specifically limited.

[0054] In the operation and decommissioning of nuclear facilities such as nuclear power plants, accelerators, and nuclear fuel reprocessing plants, tritium and carbon-14 are the main monitoring targets for their effluent emissions and surrounding environmental organisms. Tritium is a pure beta radioactive nuclide that causes internal radiation damage to the human body after inhalation. Studies have shown that the toxicity of tritiated water is 25,000 times that of elemental tritium, and the dose caused by organically bound tritium is about 2 to 3 times that of tritiated water. After entering the environment, carbon-14 can be oxidized in the atmosphere or in the ozone layer to 14 CO2 is deposited and circulated in the biosphere. In the biological transformation process of carbon-14 compounds, carbon-14 can be incorporated into DNA and RNA molecules, causing gene point mutations, so its hazards are taken seriously. According to the requirements of radiation environment monitoring, tritium and carbon-14 in biological samples need to be monitored. At the same time, the classification of radioactive waste also stipulates relevant limits for the activity concentration of waste containing tritium and carbon-14. In related technologies, the processing and extraction equipment of tritium and carbon-14 mainly adopts the oxidation combustion method, which can only process one type of sample of high activity or low activity at a time. When high-activity samples and low-activity samples are processed in sequence for multiple times, cross contamination may occur, and the working tube is inconvenient to decontaminate and difficult to clean.

[0055] In view of this, the first aspect of the embodiment of the present application, please refer to Figure 1 , provides a radioactive sample processing system, including a gas supply device 1, a combustion device 2, a collection device 3 and a control device 4.

[0056] The gas supply device 1 has at least one gas supply channel 1a, which is used to provide gas for burning the radioactive sample, such as oxygen. Specifically, there can be two gas supply channels 1a, which respectively pass oxygen and nitrogen. Oxygen is used to participate in the combustion reaction of the radioactive sample. Nitrogen can be passed before combustion to first exhaust the air in the processing system. At the same time, nitrogen is passed during the combustion process to mix with oxygen, which can reduce the situation where the working tube 22 bursts due to excessive oxygen concentration when only one gas supply channel 1a is passed.

[0057] The combustion device 2 includes a combustion furnace 21 and a working tube 22 arranged in the combustion furnace 21. The combustion furnace 21 can be a tubular furnace, an induction furnace or a resistance furnace, etc., which is used to heat the working tube 22. For example, it can be a tubular furnace, which has a larger contact area with the working tube 22 and a higher heating efficiency. The combustion furnace 21 has at least two combustion channels 2a connected to the gas supply channel 1a, and each combustion channel 2a is provided with a working tube 22, and each working tube 22 is used to place a radioactive sample. For example, the combustion furnace 21 is a special tubular furnace with two combustion channels 2a, and two working tubes 22 are provided, which are respectively used for processing high-activity radioactive samples and low-activity radioactive samples.

[0058] The collecting device 3 has a collecting channel 3a connected to each combustion channel 2a, and each collecting channel 3a is used to collect radioactive substances after the radioactive sample in the corresponding working tube 22 is burned. It can be understood that there can be multiple groups of collecting modules 31 for collecting in each collecting channel 3a, and specific collecting modules 31 are set according to the type of radioactive substances to be collected. For example, the radioactive substances to be collected may be tritium and carbon-14, and the collecting modules 31 are provided with two groups, namely, a water vapor collecting module 31 and a carbon dioxide collecting module 31. The collecting device 3 may include a weighing module and a display module to directly display the collection results; the collecting device 3 may also be connected to the control device 4, and the collection results are displayed through the control device 4.

[0059] The control device 4 is respectively connected to the gas supply device 1 and the combustion furnace 21 by signal, and is used to control the gas supply flow of the gas supply device 1 and the temperature in the combustion furnace 21. The control device 4 can be a computer, and the gas supply device 1 and the combustion device 2 are remotely controlled by a computer program. The program can be saved and called, which improves the work efficiency and has a good human-computer interaction experience. It is understandable that the control device 4 can also be connected to the collection device 3 by signal to generate a collection trend curve. For example, the control device 4 is a computer, and the collection device 3 feedbacks the signal and transmits it to the computer to generate a real-time processing progress trend curve. The computer reaction progress control program makes judgments and controls the work processing progress according to the trend curve, and then adjusts the gas supply flow or the temperature in the combustion furnace 21, which can timely reduce the temperature of the combustion furnace 21 at the end of the collection, saving energy and reducing processing time.

[0060] The processing system provided in the embodiment of the present application processes multiple groups of radioactive samples through at least two combustion channels and corresponding connected collection channels. For example, processing multiple groups of radioactive samples at the same time can improve efficiency. Of course, multiple groups of radioactive samples can also be processed at different times, and can be placed in corresponding combustion channels for processing according to the properties of the corresponding samples. Radioactive samples of the same nature, such as radioactive samples of the same activity, use the same combustion channel and corresponding connected collection channels, which reduces cross-contamination when radioactive samples of different natures are processed in batches in the same combustion channel and collection channel, and improves the processing effect.

[0061] In one embodiment, the gas supply device 1 includes a gas supply container 11, a pressure reducing valve 12, a purification unit 13 and a flow controller 14. The gas supply container 11 is used to provide gas, for example, oxygen to enable the combustion device 2 to perform a combustion reaction. The pressure reducing valve 12 is connected to the gas supply container 11 to control the pipeline pressure when the gas supply container 11 delivers gas, thereby improving the safety of gas delivery. The purification unit 13 is connected to the pressure reducing valve 12 to purify the gas delivered by the gas supply container 11, reduce the incomplete reaction or explosion of the combustion device 2 caused by impure gas, and reduce the influence of impurities or water vapor in the impure gas on the weighing in the downstream collection device 3, thereby affecting the processing result. The flow controller 14 is connected to the purification unit 13, and the control device 4 is connected to the flow controller 14 signal, which is used to control the flow rate of gas delivered to each combustion channel 2a respectively. It can be understood that the gas flow rate can be directly controlled by the flow controller 14, and the gas flow rate can also be remotely controlled by the control device 4. The control device 4 can be a computer. The control of the gas flow rate can be programmed and stored according to multiple processing experiences. The program can be input and used during processing, which improves work efficiency and provides a good human-computer interaction experience.

[0062] Specifically, the gas supply channel 1a may include a common channel 1a' and a diversion channel 1a", the gas supply container 11, the pressure reducing valve 12 and the purification part 13 are connected to form a common channel 1a', each diversion channel 1a" is connected to the common channel 1a' and the corresponding combustion channel 2a, and each diversion channel 1a" is provided with a flow controller 14. Multiple diversion channels 1a" share a set of gas supply devices 1, saving costs and design space.

[0063] In one embodiment, there are at least two gas supply channels 1a, and the gas supply device 1 further includes a mixing container 15. Each combustion channel 2a is connected to a corresponding mixing container 15, and each gas supply channel 1a is connected to the mixing container 15 to mix the gas in each gas supply channel 1a and deliver it to the corresponding combustion channel 2a. Specifically, there are two gas supply channels 1a, which deliver oxygen and nitrogen respectively, and there are two combustion channels 2a, which are used for processing high-activity radioactive samples and low-activity radioactive samples. The mixing ratio of oxygen and nitrogen is determined according to different types of radioactive samples, and the mixing container 15 is adjusted to achieve the delivery of the mixed gas of the two combustion channels 2a, so as to achieve complete combustion of the radioactive samples in the combustion channel 2a and improve the processing efficiency of the radioactive samples.

[0064] In one embodiment, the combustion device 2 further includes a pressure fluctuation suppression container 23. The structure of the pressure fluctuation suppression container 23 is not limited, and can be a detachable or integral cavity structure. Each combustion channel 2a is provided with a pressure fluctuation suppression container 23. One end of the pressure fluctuation suppression container 23 is connected to the gas supply device 1, and the other end is connected to the corresponding working tube 22. The pressure fluctuation suppression container 23 is used to suppress the instantaneous airflow pressure generated by the working tube 22. In this way, the pressure fluctuation suppression container 23 suppresses the impact of the sudden increase in instantaneous airflow pressure generated when the working tube 22 suddenly explodes with an open flame, and reduces the rupture of the working tube 22 due to the sudden increase in air pressure and the reverse diffusion of radioactive samples to the gas supply device 1.

[0065] In one embodiment, the pressure fluctuation suppression container 23 is a docking detachable cavity structure. If the working tube 22 is broken during use and the radioactive sample diffuses back to the gas supply device 1, the pressure fluctuation suppression container 23 may be contaminated, and the container can be disassembled for cleaning, which is simple and quick.

[0066] In one embodiment, the combustion furnace 21 includes a furnace cover 211, a base 212, a heating element 213 and a temperature controller 214. It is understandable that the combustion furnace 21 can be improved according to the existing tubular furnace, the base 212 forms at least two independently arranged furnace chambers 212a, each furnace chamber 212a is provided with a working tube 22, and the furnace cover 211 can be opened and closed on the base 212. In this way, it is convenient to observe and take and put the working tube 22, and the working tubes 22 of different combustion channels 2a are used to process radioactive samples of different activities respectively, which reduces cross contamination, and the processing of radioactive samples of different activities at the same time can also improve work efficiency; the working tube 22 is arranged in close contact with the furnace chamber 212a, which improves the uniformity and stability of the heating temperature. The heating element 213 is arranged on the furnace chamber 212a, and is used to heat the working tube 22. Specifically, the heating temperature can reach up to 1100°C. The heating element 213 can be a resistance wire, a heating plate or an inductor coil. The temperature controller 214 is used to adjust the heating power of the heating element 213 and monitor the temperature in the furnace 212a. The control device 4 is connected to the temperature controller 214 by signal to control the temperature in the furnace 212a. There are multiple temperature controllers 214, which respectively control the temperature in the furnace 212a of different combustion channels 2a, that is, each furnace 212a is provided with a corresponding temperature controller 214. It can be understood that by controlling the temperature controller 214 through the control device 4 to achieve remote adjustment of the temperature of the furnace 212a, the temperature in each furnace 212a can be independently controlled, which is convenient and fast, improves the control accuracy of the working tube temperature 22, improves the operation safety, and reduces the harm of radioactive substances to operators.

[0067] In one embodiment, the heating element 213 is tile-shaped and is disposed on the inner wall of the furnace 212a from top to bottom, and the working tube 22 is in contact with the tile-shaped heating element 213. In this way, the uniformity and stability of the heating temperature of the working tube 22 are improved.

[0068] In one embodiment, the collecting device 3 includes a collecting module 31 and a drying module 32. Each collecting channel 3a is provided with at least one group of collecting modules 31 and drying modules 32. The collecting module 31 is connected to the drying module 32. The drying module 32 is located downstream of the collecting module 31 and is used to dry the moisture in the gas of the collecting module 31. It can be understood that multiple groups of collecting modules 31 and drying modules 32 are used to collect multiple radioactive substances. Specifically, the collecting module 31 includes a first collecting bottle, a second collecting bottle and a third collecting bottle, and the drying module 32 includes a drying bottle. Each collecting bottle and drying bottle is formed with an air inlet and an air outlet, and is connected by a hose. It can be understood that by providing multiple collecting bottles, the absorption rate of the radioactive substances generated by the combustion device 2 can be improved and the escape of radioactive substances can be reduced.

[0069] In one embodiment, the collecting device 3 includes a second check valve 33, which is disposed between two adjacent groups of collecting modules 31 and drying modules 32. One end of the second check valve 33 is connected to the upstream group of drying modules 32, and the other end is connected to the downstream group of collecting modules 31. The second check valve 33 is used to isolate moisture or carbon dioxide in the air to reduce the influence of the external environment on the weighing result.

[0070] In one embodiment, the collection device 3 includes a weighing sensor assembly 34, which is arranged on the collection module 31 and the drying module 32. The type of the weighing sensor assembly 34 is not limited, and can be a mass sensor assembly or a gravity sensor assembly. The weighing sensor can be separately arranged on each collection module 31 and the drying module 32, or each group of the collection module 31 and the drying module 32 can share a weighing sensor, which saves costs. The control device 4 is connected to the weighing sensor assembly 34 signal. When the weighing sensor assembly 34 is a mass sensor assembly, it is used to obtain the mass of the radioactive material to generate a time-mass coordinate progress trend curve graph. When the weighing sensor assembly 34 is a gravity sensor assembly, it is used to obtain the weight of the radioactive material to generate a time-weight coordinate progress trend curve graph. It can be understood that the latitude of different regions is different, and the weight of the same substance displayed by the gravity sensor assembly is also different. The control device 4 can make judgments and work processing according to the trend curve graph to control the processing progress.

[0071] Specifically, the radioactive substances are tritium and carbon-14, and the collection channel 3a is provided with two groups of collection modules 31 and drying modules 32. The first group of collection modules 31 includes a first water vapor collection bottle, a second water vapor collection bottle and a third water vapor collection bottle, and the drying module 32 includes a first drying collection bottle. The second group of collection modules 31 includes a first carbon dioxide collection bottle, a second carbon dioxide collection bottle and a third carbon dioxide collection bottle, and the drying module 32 includes a second drying collection bottle. Among them, each water vapor collection bottle is filled with distilled water, each drying collection bottle is filled with silica gel or molecular sieve, and each carbon dioxide collection bottle is filled with sodium hydroxide solution. Each collection bottle and drying bottle is formed with an air inlet and an air outlet, which are connected in sequence by a hose. The control device 4 is a computer, and the weighing sensor assembly 34 includes a water vapor collection weighing sensor assembly 34 and a carbon dioxide collection weighing sensor assembly 34, which are correspondingly arranged at the bottom of each collection bottle and drying bottle. The feedback signal of each weighing sensor assembly 34 is transmitted to the computer to generate a real-time processing time-mass / weight coordinate progress trend curve graph, and the computer reaction progress control program makes judgments and controls the work processing progress according to the trend curve.

[0072] It should be noted that the above-mentioned "time-mass / weight coordinate progress trend curve chart" should be understood as, when the weighing sensor component 34 adopts a mass sensor component, it is a "time-mass coordinate progress trend curve chart", and when the weighing sensor component 34 adopts a weight sensor component, it is a "time-weight coordinate progress trend curve chart".

[0073] In one embodiment, the processing system includes a first check valve 5, and the first check valve 5 is arranged between the gas supply device 1, the combustion device 2 and the collection device 3 and the downstream of the collection device 3, so that the gas flows through the gas supply channel 1a, the combustion channel 2a and the collection channel 3a in sequence in one direction and then is discharged. That is, the first check valve 5 is arranged between the gas supply device 1 and each combustion channel 2a of the combustion device 2, the first check valve 5 is arranged between each combustion channel 2a and the collection channel 3a, and the first check valve 5 is arranged at the outlet of each collection channel 3a. In this way, the pollution of the gas supply device 1 caused by the backflow of gas, the explosion caused by the liquid of the collection device 3 being sucked back into the working pipe 22 of the combustion device 2, and the phenomenon of the collection device 3 collecting the external environment air are suppressed.

[0074] In one embodiment, please refer to Figure 2 The treatment system includes a negative pressure exhaust hood 6 with an exhaust port 6a, which is arranged outside the combustion device 2 and the collection device 3 to create an internal negative pressure environment for exhaust. The negative pressure exhaust hood 6 is formed with a hinged door for easy operation by personnel, the door frame has a sealing strip, and the top is provided with an exhaust port 6a, which ensures the exhaust gas generated during the treatment process and the local exhaust in the event of an accident, and prevents the spread of radioactive contamination.

[0075] In the second aspect of this application, see Figure 3 , provides a working tube 22 for radioactive samples, used in any one of the processing systems mentioned above in the present application, including a first working tube 221 and a second working tube 222.

[0076] The first working tube 221 is used to place the radioactive sample. For example, the radioactive sample is placed in the sample boat 7. The sample boat 7 is semi-cylindrical, and the boat body is fully fitted with the inner side of the working tube 22, which improves the uniformity of the temperature of each contact part when the sample is burned. The second working tube 222 is used to place the catalyst 8. For example, the catalyst 8 is a columnar honeycomb precious metal catalyst. One end of the first working tube 221 is connected to the gas supply device 1, and the other end is detachably connected to one end of the second working tube 222. The other end of the second working tube 222 is connected to the collecting device 3.

[0077] The working tube 22 provided in the embodiment of the present application divides the traditional integrated structure of the working tube 22 into two detachable parts. The first working tube 221 is used to place the radioactive sample, and the second working tube 222 is used to place the catalyst 8. It is easy to disassemble and clean after the combustion reaction, and it is easy to replace one of them if it is broken, thereby reducing the replacement cost.

[0078] In one embodiment, the first working tube 221 includes a first filter assembly 2211 and a second filter assembly 2212. The first filter assembly 2211 is disposed on a side of the first working tube 221 close to the gas supply device 1, and is used to suppress the large particle combustion products from flowing back into the gas supply device 1 during the combustion process; the second filter assembly 2212 is disposed on a side of the first working tube 221 close to the second working tube 222, and is used to suppress the large particle combustion products from entering the second working tube 222 during the combustion process. In this way, the large particle combustion products that are not fully burned are blocked, so that the large particle combustion products continue to burn in the first working tube 221 until they become gaseous, reducing the impact on the gas supply device 1 and the catalyst 8 in the second working tube 222.

[0079] In one embodiment, the caliber of one end of the first working tube 221 is smaller than that of the other end, which is used to limit the position of the second filter assembly 2212, and the caliber of one end of the second working tube 222 is smaller than that of the other end, which is used to limit the position of the catalyst 8. It can be understood that the first filter assembly 2211 and the second filter assembly 2212 are installed from the end with a larger diameter, and the second filter assembly 2212 is installed first, and the end with a smaller diameter is used to limit the position of the second filter assembly 2212. The connection method of each port of the first working tube 221 and the second working tube 222 is not limited, and can be a flange or threaded sealing connection.

[0080] Specifically, the first filter assembly 2211 and the second filter assembly 2212 form a combustion zone, the large-diameter area of ​​the second working tube 222 forms a catalytic zone, and the small-diameter areas of the first working tube 221 and the small-diameter areas of the second working tube 222 form a transition zone. The combustion zone, the catalytic zone, and the transition zone require different temperatures. It can be understood that the heating element 213 is provided in the combustion zone, the catalytic zone, and the transition zone. The temperature controller 214 is respectively connected to the heating elements 213 in different zones by signals. The combustion zone, the catalytic zone, or the transition zone can be adjusted by the temperature controller 214 to meet the temperature requirements of different zones.

[0081] The third aspect of this application, see Figure 4 , provides a method for processing a radioactive sample, which is applied to any of the above-mentioned processing systems of the present application, and the processing method comprises:

[0082] S1. Turn on the gas supply device to supply gas to each combustion channel to be processed in the combustion device;

[0083] S2. Setting preset parameters corresponding to the gas supply device and each combustion channel in the control program of the control device, and generating a time-mass / weight coordinate progress trend curve of each collection channel of the collection device;

[0084] S3, running the control program until each progress trend curve reaches a horizontal level, the curve fluctuation is within the preset value range and the duration meets the set duration parameter;

[0085] S4. Stop running the control program, stop the combustion and heating of the combustion device, and turn off the gas supply of the gas supply device.

[0086] The order of some steps of the above processing method can be adjusted according to actual conditions. For example, S2 can be before S1. The order of setting the heating temperature rise curve of the working tube 22 in each combustion channel 2a and setting the time-mass / weight coordinate progress trend curve of each collection channel 3a of the collection device 3 can also be adjusted.

[0087] The present application controls the gas supply device 1 and the combustion device 2 by setting the flow rate change sections, duration of each section, heating temperature rise curve and time-mass / weight coordinate progress trend curve of the supply gas through the control program, thereby realizing automatic control of the entire process and improving work efficiency.

[0088] The processing method of the embodiment of the present application is described in detail below in conjunction with specific embodiments.

[0089] S1. Turn on the gas supply device to supply gas to each combustion channel to be processed in the combustion device.

[0090] There are multiple combustion channels in the combustion device. According to the number and properties of the radioactive samples to be processed, the corresponding combustion channel is selected to place the radioactive samples for processing. That is, the gas supply device supplies gas to the combustion channel where the radioactive samples are placed, and the combustion channel where no radioactive samples are placed does not need to be supplied with gas.

[0091] S2. Setting preset parameters corresponding to the gas supply device and each combustion channel in the control program of the control device, and generating a time-mass / weight coordinate progress trend curve of each collection channel of the collection device.

[0092] In this step, the flow rate change section of the supply gas, the duration of each section, the heating temperature rise curve and the time-mass / weight coordinate progress trend curve are set according to the specific type of radioactive material to be processed. If the control program stores the relevant curve, it can be used directly. If the control program does not store the relevant curve, it can be saved after one processing. Among them, the time-mass / weight coordinate progress trend curve refers to the curve of the mass or weight of the radioactive material collected in the collection device 3 over time. It can be understood that when the weighing sensor component 34 is a mass sensor component, it is used to obtain the mass of the radioactive material to generate the time-mass coordinate progress trend curve, and when the weighing sensor component 34 is a gravity sensor component, it is used to obtain the weight of the radioactive material to generate the time-weight coordinate progress trend curve, which can reflect the progress of the treatment. It can be understood that the heating temperature rise curve and the time-mass / weight coordinate progress trend curve of the same type of radioactive material have nothing to do with the activity of the radioactive sample and will not change due to the high or low activity of the radioactive sample. Specifically, a time-mass / weight coordinate progress trend curve of each collecting channel 3a of the collecting device 3 is set, and the control device 4 saves the relevant algorithm through the program, and inputs the flow rate change section and the duration parameters of each section corresponding to the gas supply device 1; the multi-stage heating rate, operation time, and insulation time parameters corresponding to the combustion device 2. It can be understood that the multi-stage heating rate parameters corresponding to the combustion device 2 can respectively adjust the temperatures of the combustion zone, the catalytic zone, and the transition zone, and the operation time parameters of the combustion device 2 are less than the duration parameters of each section of the gas supply device 1. In this way, gas can be introduced for a period of time after the combustion is completed to purge the working tube 22, realize purging and decontamination, and cool the tube body. The temperatures of the combustion zone, the catalytic zone, and the transition zone of the combustion furnace 21 are displayed and monitored by generating a heating temperature rise curve. According to the weighing sensor component 34 of the collection device 3, in combination with the algorithm, a time-mass / weight coordinate progress trend curve is generated in real time, and calculation processing is performed on the obtained curve. For example, in the subsequent ten minutes, the mass obtained by the time-mass / weight coordinate progress trend curve changes with time within the range of ±0.5% or ±1%. It can be considered that the curve reaches a level within the error range and the combustion is complete. It is understandable that the allowable error can be set by the user according to the processing requirements. In this way, the progress of the processing can be understood in time, and the program can be stopped in time within the error range acceptable to the user, shortening the processing time.

[0093] In one embodiment, the control device 4 does not store the flow rate change sections, duration of each section, heating temperature rise curve and time-mass / weight coordinate progress trend curve of the supply gas of the radioactive material to be treated. The relevant parameters are obtained through a one-time processing process and stored in the control program of the control device 4 for the next use.

[0094] S3. Run the control program until each progress trend curve reaches a horizontal level, the curve fluctuation is within a preset value range and the duration meets the set duration parameter.

[0095] It is understandable that the end of the combustion reaction is indicated when each progress trend curve reaches a horizontal level and no longer changes, and the duration parameter is set according to different radioactive materials. The level refers to the relative level, that is, even if the combustion is complete, the slight fluctuation of the airflow will still cause the fluctuation of the value of the weighing sensor component 34 of the collection device 3. Therefore, the trend curve cannot be absolutely horizontal in the later stage, but fluctuates within a preset value error range. This preset value can be set by the user in the parameter setting interface. For example, the acceptable fluctuation range is set to within the range of ±0.5%; ±1%; ±2% of the weighing value. If the set duration is continuously met, it is considered to be complete combustion.

[0096] Specifically, taking natural rubber gloves as an example, 20g of dry sample is taken for combustion operation. After collection, the theoretical mass of water generated is 21.18g, referred to as Ag. If the trend curve fluctuates within the range of A±A*1% and lasts for 10 minutes, it can be considered that the combustion is complete and the collection work is completed.

[0097] S4. Stop running the control program, stop the combustion and heating of the combustion device, and turn off the gas supply of the gas supply device.

[0098] It is understandable that the combustion and heating of the combustion device 2 are stopped first and then the gas supply of the gas supply device 1 is turned off to purge the working tube 22 to achieve purging, decontamination and cooling of the tube body. It is understandable that the stop operation control program can be manually operated by the operator or automatically controlled. For example, the stop operation control program can be manually operated, and when the curve fluctuation is within the preset value range and the duration meets the set duration parameter, the operation is stopped by the operator operating the control device 4. The stop operation control program can also be that the control device 4 directly controls according to the program to stop the combustion and heating of the combustion device 2 and then turn off the gas supply of the gas supply device 1. In this way, through the automatic control and integrated setting of the processing system, it is convenient for personnel to operate and judge the processing process.

[0099] Taking a single combustion channel 2a and a corresponding collection channel 3a as an example, the operation method of the treatment system provided in the embodiment of the present application for treating radioactive substances tritium and carbon-14 is as follows:

[0100] 1) The first working tube 221 and the second working tube 222 are connected by threaded sealing and placed on the furnace 212a of the combustion furnace 21. The first water vapor collection bottle with distilled water, the second water vapor collection bottle, the third water vapor collection bottle, the first dry collection bottle with silica gel, the first carbon dioxide collection bottle with sodium hydroxide solution, the second carbon dioxide collection bottle, the third carbon dioxide collection bottle, and the second dry collection bottle with silica gel are weighed and placed on the water vapor collection weighing sensor component 34 and the carbon dioxide collection weighing sensor component 34. The first water vapor collection bottle, the second water vapor collection bottle, the third water vapor collection bottle and the first dry collection bottle are connected in sequence, and the first carbon dioxide collection bottle, the second carbon dioxide collection bottle, the third carbon dioxide collection bottle and the second dry collection bottle are connected in sequence, and then the second check valve 33 is connected between the first dry collection bottle and the first carbon dioxide collection bottle, and the first check valve 5 is arranged upstream of the first water vapor collection bottle and downstream of the second dry collection bottle.

[0101] 2) Push the second filter assembly 2212 to the smaller end of the first working tube 221, push the catalyst 8 to the second working tube 222; weigh an appropriate amount of radioactive sample and put it in the sample boat 7, push it to the first working tube 221, and push the first filter assembly 2211 to the larger end of the first working tube 221. The first working tube 221 and the pressure fluctuation suppression chamber, and the second working tube 222 and the first check valve 5 downstream thereof are respectively connected by threaded sealing.

[0102] 3) Open the oxygen cylinder and nitrogen cylinder as the gas supply container 11 and the valves of the oxygen cylinder pressure reducing valve 12 and the nitrogen cylinder pressure reducing valve 12, and set the pressure to 0.05-0.15Mpa.

[0103] 4) Set the following parameters on the computer control program interface: flow rate change sections and duration of each section of the oxygen mass flow controller 14 and the nitrogen mass flow controller 14; the heating temperature rise curve of the working tube 22 controlled by the temperature controller 214, including multiple heating rates, operating time, and insulation time; the time-mass / weight coordinate progress trend curve generated by the water vapor collection weighing sensor component 34 and the carbon dioxide collection weighing sensor component 34 and the conditional options for stopping the program.

[0104] 5) Click the "Run" icon on the computer program control program interface, and the processing system starts running according to the set program. When the time-mass / weight coordinate progress trend curve generated by the water vapor collection weighing sensor component 34 and the carbon dioxide collection weighing sensor component 34 reaches a level, and the curve fluctuation is within the preset value range and the duration meets the set duration parameter, the program stops running and automatically shuts down the oxygen mass flow controller 14, the nitrogen mass flow controller 14 and the combustion furnace 21.

[0105] 6) The tritium-containing water vapor generated by combustion is collected in each water vapor collection bottle for use in tritium analysis and measurement, and the carbon dioxide gas is absorbed by the sodium hydroxide in each carbon dioxide collection bottle for use in carbon-14 analysis and measurement.

[0106] The above is only a preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. All modifications, equivalent substitutions, improvements, etc. within the spirit and principles of the present application are included in the protection scope of the present application.

Claims

1. A radioactive sample processing system, characterized in that: include: An air supply device having at least two air supply channels; A combustion device, comprising a combustion furnace, a working tube arranged in the combustion furnace, and a pressure fluctuation suppressor, wherein the combustion furnace has at least two combustion channels connected to the gas supply channel, each of the combustion channels is provided with the working tube, each of the working tubes is used to place a radioactive sample, each of the combustion channels is provided with the pressure fluctuation suppression container, one end of the pressure fluctuation suppression container is connected to the gas supply device, and the other end is connected to the corresponding working tube, and the pressure fluctuation suppression container is used to suppress the instantaneous airflow pressure generated by the working tube; A collecting device, comprising a collecting channel connected to each of the combustion channels, each of the collecting channels being used to collect radioactive substances after the combustion of the radioactive sample in the corresponding working tube; as well as A control device, connected to the gas supply device and the combustion furnace by signals, for controlling the gas supply flow of the gas supply device and the temperature in the combustion furnace; The gas supply device includes a mixing container, each of the combustion channels is connected to a corresponding mixing container, and each of the gas supply channels is connected to the mixing container, so that the gas in each of the gas supply channels is mixed and then delivered to the corresponding combustion channel; The working tube includes a first working tube and a second working tube, the first working tube is used to place a radioactive sample, and the second working tube is used to place a catalyst. One end of the first working tube is connected to the gas supply device, and the other end of the first working tube is detachably connected to one end of the second working tube, and the other end of the second working tube is connected to the collecting device. The first working tube includes a first filter component and a second filter component. The first filter component is arranged on a side of the first working tube close to the gas supply device, and is used to suppress large particle combustion products from flowing back into the gas supply device during combustion; the second filter component is arranged on a side of the first working tube close to the second working tube, and is used to suppress large particle combustion products from entering the second working tube during combustion; the caliber of one end of the first working tube is smaller than the caliber of the other end, and is used to limit the radioactive sample; the caliber of one end of the second working tube is smaller than the caliber of the other end, and is used to limit the catalyst.

2. The processing system according to claim 1, characterized in that The gas supply device comprises: Gas supply container, used for supplying gas; a pressure reducing valve connected to the gas supply container; a purification unit connected to the pressure reducing valve to purify the gas delivered by the gas supply container; and A flow controller connected to the purification unit, wherein the control device is connected to the flow controller by signal, and is used to control the flow rate of gas delivered to each of the combustion channels respectively; The gas supply channel includes a common channel and a diversion channel. The gas supply container, the pressure reducing valve and the purification unit are connected to form the common channel. Each diversion channel connects the common channel and the corresponding combustion channel. Each diversion channel is provided with the flow controller.

3. The processing system according to claim 1, characterized in that The pressure fluctuation suppression container is a docking and detachable cavity structure.

4. The processing system according to claim 1, characterized in that The combustion furnace comprises: Furnace cover; A base, forming at least two independently arranged furnaces, each of which is provided with a working tube, and the furnace cover is openably and closably arranged on the base; a heating element, disposed on the furnace, for heating the working tube; and The temperature controller is used to adjust the heating power of the heating element and monitor the temperature in the furnace. The control device is connected to the temperature controller signal to control the temperature in the furnace.

5. The processing system according to claim 4, characterized in that The heating element is in the shape of a tile and is arranged on the inner wall of the furnace from top to bottom. The working tube is in contact with the tile-shaped heating element.

6. The processing system according to claim 1, characterized in that The collecting device includes a collecting module and a drying module. Each collecting channel is provided with at least one group of the collecting module and the drying module. The collecting module is connected with the drying module. The drying module is located downstream of the collecting module and is used to dry the moisture in the gas of the collecting module.

7. The processing system according to claim 6, characterized in that The collecting device comprises a second check valve disposed between two adjacent groups of the collecting modules and the drying modules, one end of the second check valve being connected to the drying module of the upstream group, and the other end being connected to the collecting module of the downstream group.

8. The processing system according to claim 6, characterized in that The collecting device comprises a weighing sensor assembly arranged on the collecting module and the drying module. The control device is connected to the weighing sensor assembly signal to obtain the mass or weight of the radioactive material to generate a time-mass / weight coordinate progress trend curve.

9. The processing system according to any one of claims 1 to 8, characterized in that: The processing system includes a first check valve, and the first check valve is arranged between the gas supply device, the combustion device and the collection device and downstream of the collection device, so that the gas can flow through the gas supply channel, the combustion channel and the collection channel in one direction in sequence and then be discharged.

10. The processing system according to any one of claims 1 to 8, characterized in that: The processing system comprises a negative pressure exhaust hood with an exhaust port, which is arranged outside the combustion device and the collection device and is used to create an internal negative pressure environment for exhaust.

11. A method for processing a radioactive sample, characterized in that: Applied to the processing system according to any one of claims 1 to 10, the processing method comprises: Opening the gas supply device to supply gas to each of the combustion channels to be processed in the combustion device; Setting preset parameters corresponding to the gas supply device and each of the combustion channels in the control program of the control device, and generating a time-mass / weight coordinate progress trend curve of each of the collection channels of the collection device; Running the control program until each of the progress trend curves reaches a level, the curve fluctuation is within a preset value range and the duration meets the set duration parameter; The control program is stopped, combustion and heating of the combustion device are stopped, and the gas supply of the gas supply device is turned off.

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