An alpha radioactivity online measurement device and post-processing online analysis system

Abstract

The present invention discloses an alpha radioactivity online measuring device, comprising a sleeve and a circulation cell. The circulation cell is provided with an opening, the opening of the circulation cell is arranged opposite to the opening of the sleeve, a detection assembly is provided in the sleeve, the detection assembly includes a detector, the detector faces the opening of the circulation cell, the circulation cell is used for feeding liquid to flow through, a rotating hub is provided in the circulation cell, the rotating hub rotates, and is used to drive the liquid to the bottom of the detector, so that the detector can measure the alpha radioactivity of the liquid. The device can accurately measure the alpha radioactivity in the liquid of the post-processing process online, and can also perform continuous measurement, and provide measurement results in real time to facilitate process parameter adjustment. The present invention also discloses a post-processing online analysis system.

Description

Technical Field

[0001] The invention specifically relates to an alpha radioactivity online measuring device and a post-processing online analysis system. Background Art

[0002] Early post-processing plants in my country used the cloth belt α measurement method, the gap α measurement method and the rotating semicircular plate α measurement method to carry out online measurement of the α radioactivity activity in the process liquid. However, they inevitably encountered the problem of detectors being easily contaminated and corroded. At the same time, due to the limited layout space, the debugging, calibration and maintenance of the equipment were difficult, and there was also a risk of personnel being exposed to radiation.

[0003] The composition of the post-processing process liquid is complex, and some of the post-processing process liquids have high γ radioactivity, while the α radionuclide content is low. At present, when measuring the α radioactivity of the post-processing process liquid, it is necessary to dilute the sample first until the γ radioactivity of the sample reaches an acceptable level of radiation dose in the glove box, and then measure the α radioactivity in the sample. However, this measurement method will cause the α radioactivity of the sample to be diluted to a lower level, and the α radionuclide with a lower content will be difficult to measure.

[0004] Moreover, the penetrability of α particles is relatively weak, and it is difficult to measure the α radioactivity in the liquid online once the distance is far. Therefore, how to accurately measure the α radioactivity online is an urgent problem to be solved. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide an α radioactivity online measurement device and a post-processing online analysis system in view of the above-mentioned deficiencies in the prior art, which can accurately measure the α radioactivity of the feed liquid online, can also perform continuous measurement, and provide measurement results in real time to facilitate process parameter adjustment.

[0006] According to an embodiment of the first aspect of the present invention, there is provided an alpha radioactivity online measuring device, comprising a sleeve and a flow cell. The flow cell is provided with an opening, the opening of the flow cell is arranged opposite to the opening of the sleeve, a detection assembly is provided in the sleeve, the detection assembly comprises a probe, the probe faces the opening of the flow cell, the flow cell is used for feeding liquid to flow through, a rotating hub is provided in the flow cell, the rotating hub rotates, and is used to drive the feed liquid to the bottom of the probe, so that the detection assembly can measure the alpha radioactivity of the feed liquid.

[0007] Preferably, a purge assembly is further included, the purge assembly includes a purge plate, the purge plate is fixedly installed in the sleeve and is located between the probe and the hub, the purge plate is used to form a stratified gas layer between the probe and the hub to prevent radioactive aerosols from contaminating the probe, a first through hole is opened on the purge plate, the probe is opposite to the first through hole, and the probe can measure the alpha radioactivity of the liquid through the first through hole.

[0008] Preferably, it also includes a calibration component, which is arranged in the sleeve and includes a calibration disk, which is arranged at the opening of the sleeve and is located below the purge plate. The calibration disk is provided with a measuring position, and a second through hole is opened on the measuring position. The first through hole is aligned with the second through hole to form a measuring hole. The probe is located directly above the measuring hole. The hub rotates and drives the feed liquid to the measuring hole. The alpha particles in the feed liquid pass through the measuring hole, so that the probe can measure the alpha radioactivity of the feed liquid.

[0009] Preferably, the detection component also includes a photomultiplier tube, a signal amplifier and a control unit, the probe is coupled to the photomultiplier tube, the probe is used to detect the α radioactive activity of the feed liquid and generate a first light signal, and send the first light signal to the photomultiplier tube, the photomultiplier tube is electrically connected to the signal amplifier, the photomultiplier tube is used to convert the first light signal into a first electrical signal, and send the first electrical signal to the signal amplifier, the signal amplifier is electrically connected to the control unit, the signal amplifier is used to amplify the first electrical signal, and send the amplified first electrical signal to the control unit, the control unit is used to receive the amplified first electrical signal and convert the first electrical signal into detection data of the radioactive activity of the feed liquid, and upload the detection data of the feed liquid to the data processing system.

[0010] Preferably, the calibration disk is further provided with a calibration position, and a calibration source is embedded in the calibration position of the calibration disk. The calibration disk can rotate around its own central axis so that the calibration source rotates to directly below the first through hole and the probe faces the calibration source. The probe is also used to detect the α radioactivity of the calibration source and generate a second optical signal, and send the second optical signal to the photomultiplier tube. The photomultiplier tube is also used to receive the second optical signal and convert the second optical signal into a second electrical signal, and send the second electrical signal to the signal amplifier. The signal amplifier is also used to amplify the second electrical signal and send the amplified second electrical signal to the control unit. The control unit pre-stores standard data of the α radioactivity of the calibration source. The control unit is also used to receive the amplified second electrical signal and convert the second electrical signal into detection data of the α radioactivity of the calibration source. The device also includes a warning unit, and the control unit is electrically connected to the warning unit. The control unit is also used to compare the detection data of the calibration source with the standard data, and when the difference between the detection data and the standard data is greater than the allowable range, the warning unit is controlled to send a warning signal.

[0011] Preferably, the calibration source is an americium-241 source.

[0012] Preferably, the calibration disk is also provided with a cleaning position, and the measuring position, the calibration position and the cleaning position are evenly distributed on the calibration disk at equal angles. The calibration assembly also includes a motor, and the motor is connected to the calibration disk through a transmission shaft. The motor is used to drive the calibration disk to rotate, so that the measuring position, the calibration position and the cleaning position of the calibration disk are rotated to the bottom of the first through hole in sequence. The cleaning position of the calibration disk is set as a solid plate, and the solid plate is used to close the first through hole when cleaning the circulation pool to prevent liquid from contaminating the probe.

[0013] Preferably, the detection component is a ZnS (Ag) scintillator type detector or a PIPS type detector.

[0014] Preferably, an inlet is provided at the bottom of the circulation pool, and the inlet is connected to the inlet tube for feeding liquid to flow into the circulation pool. An overflow port is provided at the upper end of the side wall of the circulation pool, and the overflow port is connected to the overflow tube for feeding liquid to flow out of the circulation pool.

[0015] Preferably, it also includes a cleaning component, which includes a cleaning pipeline and an ultrasonic cleaner. The cleaning pipeline is connected to the circulation pool through an inlet pipeline for supplying cleaning liquid to flow into the circulation pool. The ultrasonic cleaner is arranged in the circulation pool for cleaning the inner wall of the circulation pool and the surface of the hub.

[0016] Preferably, a shielding body is provided in the sleeve, the shielding body is fixedly connected to the inner wall of the sleeve, the detection assembly is accommodated in the shielding body, and the shielding body is used to shield the interference of external nuclear radiation on the detection assembly.

[0017] According to an embodiment of the second aspect of the present invention, there is provided a post-processing online analysis system, comprising an air lifting device and the above-mentioned α radioactivity online measuring device, wherein the α radioactivity online measuring device is installed under the top plate of the equipment room or in a glove box.

[0018] The α radioactivity online measuring device of the present invention rotates the hub so that the feed liquid forms a liquid film on the surface of the hub. The liquid film formed on the surface of the hub is located directly below the probe and is relatively close to the probe, so the probe can easily detect the α radioactivity of the feed liquid. In addition, the feed liquid continuously flows through the circulation pool and the hub continuously rotates, so that the probe can continuously measure the α radioactivity of the feed liquid and provide the measurement results in real time to facilitate the adjustment of process parameters. Therefore, the present device can accurately measure the α radioactivity of the feed liquid online, and can also perform continuous measurement and provide the measurement results in real time to facilitate the adjustment of process parameters. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a schematic structural diagram of an alpha radioactivity online measuring device in some embodiments of the present invention;

[0020] Figure 2 is a schematic diagram of the structure of a calibration disk in some embodiments of the present invention;

[0021] Figure 3 is a schematic diagram of the structure in which the online measurement device for α radioactivity activity in some embodiments of the present invention is installed on the top plate of the equipment room;

[0022] Figure 4 is a schematic diagram of the structure of an α radioactivity online measuring device in some embodiments of the present invention installed in a glove box;

[0023] In the figure: 1-sleeve, 2-circulation cell, 3-detection assembly, 31-probe, 32-control unit, 4-rotating hub, 5-calibration assembly, 51-calibration disk, 52-measuring position, 53-calibration position, 54-cleaning position, 55-drive shaft, 6-purge assembly, 7-ultrasonic cleaner, 8-shielding body, 9-equipment room top plate, 10-glove box, 11-lifting platform. DETAILED DESCRIPTION

[0024] The following will be combined with the accompanying drawings in the present invention to clearly and completely describe the technical solutions in the invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of the present invention.

[0025] In the description of the present invention, it should be noted that the terms "upper", "lower" and the like indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings and are only for the convenience and simplification of the description. They do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they should not be understood as limitations on the present invention.

[0026] In the description of the present invention, the terms “first”, “second” and “third” are used for descriptive purposes only and should not be understood as indicating or implying relative importance.

[0027] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connect", "set", "install", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection, or an integral connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0028] Example 1

[0029] See also Figure 1 The present invention discloses an alpha radioactivity online measuring device for measuring the alpha radioactivity of a post-processing process liquid, comprising a sleeve 1 and a circulation cell 2.

[0030] Among them, the sleeve 1 is located directly above the circulation pool 2, and the opening of the sleeve 1 faces downward. The circulation pool 2 is provided with an opening, and the opening of the circulation pool 2 faces upward and is arranged opposite to the opening of the sleeve 1. A detection component 3 is provided in the sleeve 1, and the detection component 3 includes a probe 31, and the probe 31 faces the opening of the circulation pool 2. The circulation pool 2 is used for the post-processing process liquid to flow through. The circulation pool 2 is provided with a rotating hub 4, and the rotating hub 4 is made of stainless steel. By rotating the rotating hub 4, the liquid forms a liquid film on the surface of the rotating hub 4. The liquid film formed on the surface of the rotating hub 4 is located directly below the probe 31 and is close to the probe 31, so that the probe 31 can easily detect the α radioactivity of the liquid.

[0031] In this embodiment, an injection port is provided at the bottom of the circulation pool 2, and the injection port is connected to the injection tube, so as to allow the feed liquid to flow into the circulation pool 2. An overflow port is provided at the upper end of the side wall of the circulation pool, and the overflow port is connected to the overflow tube, so as to allow the feed liquid to flow back from the circulation pool 2 to the equipment room. Specifically, the feed liquid flows into the circulation pool 2 from the injection port, and when the liquid level of the feed liquid in the circulation pool 2 reaches the overflow port, the feed liquid overflows from the overflow port out of the circulation pool 2. Therefore, the feed liquid can continuously flow through the circulation pool 2, and at the same time, the motor drives the rotating hub 4 to continuously rotate, so that the probe 31 can continuously measure the α radioactivity activity of the feed liquid, and provide the measurement results in real time to facilitate the adjustment of the process parameters.

[0032] Therefore, the device can accurately measure the α radioactivity of the feed liquid online, can also perform continuous measurement, and provide measurement results in real time to facilitate process parameter adjustment.

[0033] In this embodiment, the detection component 3 uses a ZnS (Ag) scintillator detector, and the probe 31 is a ZnS (Ag) crystal, that is, a zinc (silver) sulfide crystal. The detection component 3 also includes a photomultiplier tube, a signal amplifier, and a control unit 32. Among them, the probe 31 is coupled to the photomultiplier tube, and the probe 31 is used to detect the α radioactivity of the slurry and generate a first light signal, and send the first light signal to the photomultiplier tube, and the photomultiplier tube is used to convert the first light signal into a first electrical signal. Specifically, the α particles released by the slurry can excite the probe 31 to release scintillation photons, that is, the first light signal. The scintillation photons are injected into the photocathode of the photomultiplier tube through the light guide and emit photoelectrons. The photoelectrons are accelerated by the strong electric field between the dynodes and bombard the next dynode to emit more photoelectrons, thereby realizing the multiplication of the photoelectrons until they finally reach the anode and are in the output circuit, so that the photomultiplier tube generates the first electrical signal. Further, the photomultiplier tube is electrically connected to the signal amplifier and sends the first electrical signal to the signal amplifier, the signal amplifier is electrically connected to the control unit 32, the signal amplifier is used to amplify the first electrical signal and send the amplified first electrical signal to the control unit 32. The control unit 32 is used to receive the amplified first electrical signal and convert the first electrical signal into detection data of the radioactivity activity of the slurry. The control unit 32 is electrically connected to the data processing system and uploads the detection data of the slurry to the data processing system. The total α radioactivity activity in the post-processing process slurry can be measured by the ZnS (Ag) scintillator detector.

[0034] In some other embodiments, the detection component 3 uses a PIPS detector, that is, an injected planar silicon semiconductor detector, and the probe is a PIPS probe. The detection component 3 also includes a preamplifier, a main amplifier and a multi-channel pulse analyzer. The PIPS probe, the preamplifier, the main amplifier and the multi-channel pulse analyzer are electrically connected in sequence. The PIPS detector can perform energy resolution of alpha particles of different nuclides, and generate multiple electrical signals through the preamplifier, the main amplifier and the multi-channel pulse analyzer. The multi-channel pulse analyzer is electrically connected to the control unit and sends the electrical signal to the control unit. The control unit can convert the electrical signal corresponding to the radioactive activity of alpha particles of different nuclides into detection data, and upload the detection data to the data processing system. Therefore, the radioactive activity of alpha particles of different nuclides in the post-processing process liquid can be measured by the PIPS detector.

[0035] See also Figure 1 When measuring the α radioactivity of the liquid feed, the device needs to rotate the hub 4 so that the liquid feed forms a liquid film on the surface of the hub 4, thereby facilitating the probe 31 to detect the α radioactivity of the liquid feed. However, during the α radioactivity measurement process, the aerosol released by the liquid feed in the flow cell will contaminate the detector surface, causing the background count on the detector surface to increase, thereby affecting the accuracy of the measurement result.

[0036] See also Figure 1 In order to prevent aerosols from contaminating the probe 31, the device also includes a purge assembly 6, which is located in the sleeve 1. The purge assembly 6 includes a purge plate, which is fixedly installed in the sleeve 1 and is located between the probe 31 and the hub 4. Preferably, the purge plate is made of stainless steel. The purge plate is used to form a layer of stratified gas between the probe 31 and the hub 4 to block radioactive aerosols and prevent them from contaminating the probe 31. Furthermore, due to the weak penetrability of α particles, they cannot penetrate the purge plate made of stainless steel. In order to prevent the purge plate from blocking α particles and affecting the measurement effect of the probe 31. A first through hole is provided on the purge plate, and the probe 31 is directly opposite to the first through hole, so that the α particles can pass through the purge plate to ensure the accuracy of the measurement of the probe 31. The device forms a layer of stratified gas below the probe 31 through the purge assembly 6, which effectively protects the space inside the sleeve 1 and solves the problem of easy contamination of the probe 31 in online measurement.

[0037] See also Figure 1 and Figure 2 The device further comprises a calibration component 5. The calibration component 5 is arranged in the sleeve 1, and comprises a calibration disk 51, which is arranged at the opening of the sleeve 1 and is located below the purge plate. The calibration disk 51 is made of stainless steel. The calibration disk 51 is evenly distributed with measuring positions 52, calibration positions 53 and cleaning positions 54 at equal angles.

[0038] The calibration assembly 5 also includes a motor, which is connected to the calibration disk 51 through a transmission shaft 55. The motor is used to drive the calibration disk 51 to rotate around its own central axis, so that the measuring position 52, calibration position 53 and cleaning position 54 of the calibration disk 51 rotate to the bottom of the first through hole in turn, thereby switching different functions.

[0039] When the measuring position 52 is rotated to the bottom of the first through hole, the device can realize the measuring function. Figure 2 As shown, a second through hole is provided on the measuring position 52 of the calibration disk 51. When the measuring position 52 rotates to the bottom of the first through hole, the first through hole is aligned with the second through hole to form a measuring hole that passes through from top to bottom. The probe 31 is located directly above the measuring hole. The rotating hub 4 rotates and drives the feed liquid to the bottom of the measuring hole, and the α particles in the feed liquid pass through the measuring hole, so that the probe 31 can measure the α radioactivity of the feed liquid.

[0040] When the calibration position 53 is rotated to the bottom of the second through hole, the device can realize the calibration function. As the use time increases, the probe 31 will gradually age, which may cause the measurement result to deviate too much. Therefore, it is necessary to calibrate the probe 31 regularly. Figure 2 , a calibration source is embedded in the calibration position 53 of the calibration disk 51. Preferably, the calibration source is an americium source. When the probe 31 needs to be calibrated, the calibration disk 51 rotates around its own central axis so that the calibration position 53 rotates to the bottom of the first through hole. At this time, the probe 31 is located directly above the calibration source, so the α particles emitted by the calibration source can pass through the first through hole and be detected by the probe 31. The probe 31 detects the α radioactivity of the calibration source and generates a second optical signal, and also sends the second optical signal to the photomultiplier tube. After receiving the second optical signal, the photomultiplier tube converts the second optical signal into a second electrical signal, and sends the second electrical signal to the signal amplifier. The signal amplifier amplifies the second electrical signal and sends the amplified second electrical signal to the control unit 32.

[0041] After receiving the amplified second electrical signal, the control unit 32 converts the second electrical signal into detection data of the alpha radioactivity of the calibration source. In addition, the control unit 32 pre-stores standard data of the alpha radioactivity of the calibration source. The control unit 32 compares the detection data of the calibration source with the standard data. If the difference between the detection data and the standard data is within the allowable range, it is considered that the probe 31 is working normally and can continue to be used, and then the control unit controls to end the calibration.

[0042] It should be noted that when the calibration position 53 is rotated away from the bottom of the first through hole, the calibration source will be blocked by the purge plate. Since the penetration of α particles is weak and the purge plate is made of stainless steel, the α particles cannot pass through the purge plate. Therefore, when the measurement position 52 is rotated to the bottom of the first through hole, due to the blocking and shielding of the purge plate, the calibration source will not affect the α radioactivity activity of the liquid measured by the probe 31.

[0043] Furthermore, the device further includes an alarm unit, and the control unit 32 is electrically connected to the alarm unit. The control unit 32 compares the detection data of the calibration source with the standard data. If the difference between the detection data and the standard data is greater than the allowable range, the control unit 32 controls the alarm unit to send an alarm signal to remind the staff to replace the probe 31.

[0044] When the detection assembly 3 or the calibration module needs to be inspected or repaired, the stainless steel sleeve 1 can be transferred as a whole to a dedicated maintenance glove box through a maintenance container.

[0045] When the cleaning position 54 is rotated to the bottom of the second through hole, the device can achieve the function of shielding the nuclear radiation of the circulation pool 2. Please continue to refer to Figure 2 Since the post-processing process liquid circulates in the circulation pool 2 for a long time, a large amount of radioactive substances will accumulate, so the circulation pool needs to be cleaned regularly. In order to avoid the splashing of cleaning liquid when cleaning the circulation pool, which may cause contamination of the probe 31, the calibration disk 51 is also provided with a cleaning position 54. The cleaning position 54 of the calibration disk 51 is set as a solid plate. When the circulation pool 2 needs to be cleaned, the cleaning position 54 is rotated to directly below the first through hole. At this time, the solid plate of the cleaning position 54 can close the first through hole to separate the probe 31 from the circulation pool 2, thereby avoiding the splashing of cleaning liquid and contaminating the probe 31. It can be understood that Figure 2 The cleaning position 54 is only for illustration, and the cleaning position 54 can also be set at other positions of the calibration disk as long as the position is a solid plate.

[0046] The device also includes a cleaning component. The cleaning component includes a cleaning pipeline and an ultrasonic cleaner 7. The cleaning pipeline is connected to the circulation pool 2 through an inlet tube, and is used to supply cleaning liquid to flow into the circulation pool 2. The ultrasonic cleaner 7 is arranged in the circulation pool 2, and is used to clean the inner wall of the circulation pool 2 and the rotating hub 4. When the circulation pool 2 needs to be cleaned, the cleaning liquid flows into the circulation pool 2 through the cleaning pipeline and from the inlet of the circulation pool, and then the ultrasonic cleaner 7 is started to emit high-frequency sound waves, so that the cleaning liquid vibrates at a high frequency to clean the inner wall of the circulation pool 2 and the rotating hub 4. When radioactive liquid circulates in the circulation pool 2 for a long time, the rotating hub and the inner wall will absorb a large amount of radioactive substances. The radioactive substances adsorbed on the surface of the rotating hub and the inner wall of the circulation pool can be removed by cleaning to avoid the increase of the measurement background and improve the accuracy of the measurement.

[0047] See also Figure 1 , a shielding body 8 is provided in the sleeve 1, and the shielding body 8 is made of stainless steel or lead. The device is installed inside the equipment room of a nuclear facility, and is used to measure the alpha radioactivity of the post-processing process liquid. There are many interferences from nuclear radiation in the equipment room, which will affect the measurement accuracy of the probe 31. Therefore, the device can shield the interference of other nuclear radiations by providing the shielding body 8. Specifically, the shielding body 8 is fixedly connected to the inner wall of the sleeve 1, and the detection assembly 3 is accommodated in the shielding body 8, so as to shield the interference of external nuclear radiation, and will not affect the detection assembly 3 to measure the alpha radioactivity of the liquid.

[0048] Example 2

[0049] The present invention also discloses a post-processing online analysis system, which comprises an air lifting device and the α radioactivity online measuring device in embodiment 1.

[0050] The air lift device is connected to the circulation pool 2 through the sampling tube, and is used to introduce the post-processing process liquid into the circulation pool 2 through the air lift sampling method. When the liquid level in the circulation pool 2 reaches a certain height, it will flow back to the equipment room from the overflow pipe.

[0051] See also Figure 3 In this embodiment, the online measurement device for radioactivity is installed below the top plate 9 of the equipment room. Specifically, the control unit 32 is located outside the equipment room and is electrically connected to the probe 31. The circulation cell 2 is located directly below the sleeve 1. A rotating hub 4 is provided in the circulation cell 2, and the rotating hub 4 is rotated so that the slurry forms a liquid film on the surface of the rotating hub 4. The liquid film formed on the surface of the rotating hub 4 is located directly below the probe 31 and is close to the probe 31, so that the probe 31 can easily detect the α radioactivity activity of the slurry. Therefore, this post-processing online analysis system can conveniently measure the α radioactivity activity of the post-processing process slurry.

[0052] See also Figure 4 In some other embodiments, the α radioactivity online measuring device is installed in a glove box 10, and the sealing level of the glove box 10 is level 2. Specifically, the glove box 10 is placed close to the wall of the equipment room. The glove box 10 includes a lifting platform 11, and the α radioactivity online measuring device is arranged on the lifting platform. By adjusting the lifting platform 11, the α radioactivity online measuring device can be moved to a suitable height, so as to facilitate the operator to perform maintenance.

[0053] It is to be understood that the above embodiments are merely exemplary embodiments used to illustrate the principles of the present invention, but the present invention is not limited thereto. For those of ordinary skill in the art, various modifications and improvements can be made without departing from the spirit and essence of the present invention, and these modifications and improvements are also considered to be within the scope of protection of the present invention.

Claims

1. An α radioactivity online measuring device, characterized in that: It comprises a sleeve (1) and a circulation pool (2), The sleeve (1) is opened downwards, the circulation pool (2) is located directly below the sleeve (1), the top of the circulation pool (2) is provided with an opening, the opening of the circulation pool (2) is arranged opposite to the opening of the sleeve (1), a detection assembly (3) is arranged in the sleeve (1), the detection assembly (3) comprises a probe (31), the probe (31) faces the opening of the circulation pool (2), The circulation pool (2) is used for feeding liquid to flow through. A rotating hub (4) is provided in the circulation pool (2). The rotating hub (4) is located at the open portion. The rotating hub (4) rotates so that the liquid forms a liquid film on the surface of the rotating hub (4) to drive the liquid to the bottom of the probe (31) so that the detection component (3) can measure the alpha radioactivity of the liquid. The device further comprises a purge assembly (6), wherein the purge assembly (6) comprises a purge plate, The purge plate is fixedly installed in the sleeve and is located between the probe (31) and the rotating hub (4). The purge plate is used to form a stratified gas layer between the probe (31) and the rotating hub (4) to prevent radioactive aerosol from contaminating the probe (31). The purge plate is provided with a first through hole, the probe (31) is directly opposite to the first through hole, and the probe (31) can measure the alpha radioactivity of the feed liquid through the first through hole.

2. The device according to claim 1, characterized in that The apparatus further comprises a calibration component (5), wherein the calibration component (5) is arranged in the sleeve and comprises a calibration disk (51), wherein the calibration disk (51) is arranged at the opening of the sleeve (1) and is located below the purge plate. The calibration disk (51) is provided with a measuring position, a second through hole is opened on the measuring position, the first through hole is aligned with the second through hole to form a measuring hole, The probe (31) is located directly above the measuring hole, and the rotating hub (4) rotates to drive the liquid to the measuring hole, and alpha particles in the liquid pass through the measuring hole, so that the probe (31) can measure the alpha radioactivity of the liquid.

3. The device according to claim 2, characterized in that The detection assembly (3) further comprises a photomultiplier tube, a signal amplifier and a control unit (32). The probe (31) is coupled to the photomultiplier tube, and the probe (31) is used to detect the α radioactivity of the liquid and generate a first optical signal, and send the first optical signal to the photomultiplier tube. The photomultiplier tube is electrically connected to the signal amplifier, and is used to convert the first optical signal into a first electrical signal, and send the first electrical signal to the signal amplifier. The signal amplifier is electrically connected to the control unit (32), and is used to amplify the first electrical signal and send the amplified first electrical signal to the control unit (32). The control unit (32) is used to receive the amplified first electrical signal and convert the first electrical signal into detection data of the radioactivity activity of the liquid feed, and upload the detection data of the liquid feed to a data processing system.

4. The device according to claim 3, characterized in that The calibration disk (51) is further provided with a calibration position (53), and a calibration source is embedded in the calibration position (53) of the calibration disk (51). The calibration disk (51) can rotate around its own central axis so that the calibration source is rotated to the position directly below the first through hole and the probe (31) is directly facing the calibration source. The probe (31) is also used to detect the alpha radioactivity of the calibration source and generate a second optical signal, and send the second optical signal to the photomultiplier tube. The photomultiplier tube is also used to receive the second optical signal and convert the second optical signal into a second electrical signal, and send the second electrical signal to the signal amplifier. The signal amplifier is also used to amplify the second electrical signal and send the amplified second electrical signal to a control unit (32). The control unit (32) has pre-stored standard data of the alpha radioactivity activity of the calibration source, and the control unit (32) is further used to receive the amplified second electrical signal and convert the second electrical signal into detection data of the alpha radioactivity activity of the calibration source. The device further comprises an alarm unit, and the control unit is electrically connected to the alarm unit. The control unit is also used to compare the detection data of the calibration source with the standard data, and when the difference between the detection data and the standard data is greater than the allowable range, control the warning unit to send out a warning signal.

5. The device according to claim 4, characterized in that The calibration source is an americium-241 source.

6. The device according to claim 4, characterized in that The calibration disk (51) is also provided with a cleaning position (54), and the measuring position (52), the calibration position (53) and the cleaning position (54) are evenly distributed on the calibration disk (51) at equal angles. The calibration assembly (5) further comprises a motor, which is connected to the calibration disk (51) via a transmission shaft (55), and is used to drive the calibration disk (51) to rotate, so that the measuring position (52), the calibration position (53) and the cleaning position (54) of the calibration disk (51) are rotated to below the first through hole in sequence. The cleaning position (54) of the calibration plate is set as a solid plate, The solid plate is used to close the first through hole when cleaning the circulation pool (2) to prevent liquid from contaminating the probe (31).

7. The device according to claim 1, characterized in that The detection component (3) is a ZnS (Ag) scintillator type detector or a PIPS type detector.

8. The device according to claim 1, characterized in that The bottom of the circulation pool (2) is provided with an injection port, which is connected to the injection tube and is used for feeding liquid to flow into the circulation pool (2). An overflow port is provided at the upper end of the side wall of the circulation pool (2), and the overflow port is in communication with the overflow pipe to allow the feed liquid to flow out of the circulation pool (2).

9. The device according to claim 8, characterized in that Also includes cleaning components, The cleaning component comprises a cleaning pipeline and an ultrasonic cleaner (7); the cleaning pipeline is connected to the circulation pool (2) through the sample inlet tube and is used for supplying cleaning liquid into the circulation pool (2); the ultrasonic cleaner (7) is arranged in the circulation pool (2) and is used for cleaning the inner wall of the circulation pool (2) and the surface of the rotating hub (4).

10. The device according to any one of claims 1 to 9, characterized in that: A shielding body (8) is arranged inside the sleeve (1). The shielding body (8) is fixedly connected to the inner wall of the sleeve (1), and the detection component is accommodated in the shielding body (8). The shielding body (8) is used to shield the interference of external nuclear radiation on the detection component (3).

11. A post-processing online analysis system, comprising an air lifting device, characterized in that: It also includes the α radioactivity online measuring device according to any one of claims 1 to 10, The α radioactivity online measuring device is installed below the top plate (9) of the equipment room, or installed in the glove box (10).

Images