A γ-ray counting measurement device and measurement system for a radioactive solution

Abstract

The present application provides a γ-ray counting measurement device and system for radioactive solutions, including a flow cell and a detection component. The detection component is located above the flow cell and detects the γ-ray count of the radioactive solution flowing into the flow cell. The device further includes a purging component located between the detection component and the flow cell. γ-rays pass through the purging component and enter the detection component. The purging component seals the flow cell to prevent radioactive solution from entering the detection component. The measurement device proposed in the present application realizes the functions of on-line detection, purging, calibration and cleaning. The device has good measurement stability and data accuracy, providing real-time and effective monitoring data for the operation of the reprocessing process.

Description

Technical Field

[0001] This application relates to spent fuel reprocessing technology. Specifically, it relates to a γ-ray counting measurement device and measurement system for radioactive solutions. Background Art

[0002] Online reprocessing analysis is used to conduct online monitoring of radioactive process streams in the production systems of reprocessing plants, and can display the instantaneous changes in the composition of process materials at any time. Compared with conventional sampling analysis, online reprocessing analysis does not require any chemical treatment, does not damage the liquid flow, can achieve continuous measurement, and provides measurement results in real time to facilitate the adjustment of process parameters; and remote operation can be achieved.

[0003] Currently, NaI detectors are used in online reprocessing analysis to directly measure the total γ activity concentration in reprocessing process liquors. During long-term operation, the strong γ radioactivity of the liquor will gradually increase the background of the measurement device, thus interfering with the accuracy of online measurement; at the same time, when the online measurement device is performing radioactive operations such as commissioning, calibration, and maintenance, there are no corresponding air purging and cleaning decontamination measures. After contamination, there is a risk of exposure to operators.

[0004] Patent CN104122574A discloses a detection system and detection method for radioactive substance detection equipment. The detection system includes a shielding chamber, a speed control mechanical device, a lead can, and a video monitoring system. A radioactive standard source is placed in the lead can, and at least one through hole is opened thereon, and the through hole can be adjusted to open and close; the lead can is placed on the speed control mechanical device, and the speed control mechanical device is placed in the shielding chamber and drives the lead can to move back and forth at a constant speed; the video monitoring system is arranged in cooperation with the shielding chamber to monitor the test process in the shielding chamber. The detection system adopted in this patent cannot achieve online testing, and no solution to high-radiation solution contamination is given.

[0005] Patent CN106990124A discloses an online measurement device and measurement method for the uranium content in a uranium-containing liquid, including a plexiglass pipeline, a shielding housing is arranged outside the plexiglass pipeline, and 57 a 57 Co radioactive source is placed in the shielding housing. It also includes a high-purity germanium γ detector symmetrically arranged with the 57The γ-rays, which account for 85.51% in Co, are used as the penetrating rays. By means of the absorption of the γ-rays by the plexiglass pipeline and the uranium-containing solution, a relationship model between the uranium concentration and the counting rate is established to realize the online and real-time measurement of the uranium concentration in the uranium-containing liquid. This patent does not involve the switching of different working modes, and the uranium liquid is placed in a closed pipeline without involving the problem of radioactive solution escape.

[0006] In view of the above technical problems, this application is specifically proposed. Summary of the Invention

[0007] The main purpose of this application is to provide a γ-ray counting measurement device for radioactive solutions to realize the functions of online detection, purging, calibration and cleaning; the device has good measurement stability and data accuracy, and provides real-time and effective monitoring data for the operation of the reprocessing process.

[0008] To achieve the above object, this application provides a γ-ray counting measurement device for radioactive solutions, including a flow cell and a detection assembly.

[0009] The detection assembly is located above the flow cell, and the detection assembly detects the γ-ray counting of the radioactive solution flowing into the flow cell.

[0010] It further includes a purging assembly, which is located between the detection assembly and the flow cell. The γ-rays pass through the purging assembly and enter the detection assembly.

[0011] The purging assembly seals the flow cell to restrict the radioactive solution from entering the detection assembly.

[0012] Further, the purging assembly includes a sealing plate and a gas distribution and diversion disk. The gas distribution and diversion disk is sleeved under the sealing plate and is located above the liquid level of the radioactive solution in the flow cell, and is used to purge the surface of the radioactive solution in the flow cell to avoid the contamination of the sealing plate by the radioactive solution aerosol in the flow cell.

[0013] Further, it further includes a calibration disk, which is located between the purging assembly and the detection assembly. The calibration disk is provided with collimation holes, and the collimation holes allow the γ-rays to enter the detection assembly.

[0014] Further, the calibration disk has a first rotation position. When the calibration disk is in the first rotation position, the collimation holes are communicated with the detection assembly to turn on the detection mode.

[0015] Further, the diameter of the collimation holes is 1-5 mm.

[0016] Further, the calibration disk is provided with calibration holes and a calibration source located in the calibration holes.

[0017] Further, the calibration disk has a second rotation position. When the calibration disk is in the second rotation position, the calibration source is located below the detection assembly to turn on the calibration mode.

[0018] Further, it further includes a drive shaft driven by a motor. The drive shaft is connected to the calibration disc and drives the calibration disc to rotate, so as to realize the switching between the calibration and detection modes.

[0019] Further, the collimation holes and the calibration holes are symmetrically distributed about the axis where the drive shaft is located.

[0020] Further, a cleaning liquid inlet is provided on the side wall of the flow cell, and the cleaning liquid enters the flow cell through the cleaning liquid inlet.

[0021] Further, the flow cell is provided with a liquid inlet, and the liquid inlet is located at the bottom of the flow cell.

[0022] Further, an overflow port is provided on the side wall of the flow cell, and the radioactive solution flows out of the flow cell through the overflow port, so as to keep the liquid level in the flow cell stable at a certain height.

[0023] Further, the position where the overflow port is located is lower than the position where the cleaning liquid inlet is located.

[0024] Further, it further includes a shielding body. The shielding body is sleeved on the detection component to shield γ rays.

[0025] Further, the detection component includes a detector probe, and the detector probe is selected from NaI scintillation crystals.

[0026] The γ-ray counting measurement device for radioactive solution proposed by the present application has achieved the following technical effects:

[0027] 1. By arranging a sealing plate between the flow cell and the detection component, the flow cell is sealed, so as to prevent the radioactive solution in the flow cell from entering the detection component, protect the detection component and improve the detection accuracy.

[0028] 2. By arranging a gas distribution and diversion disc above the liquid level of the sealing plate and the flow cell, the surface of the solution in the flow cell is purged, so as to prevent the aerosol of the radioactive solution in the flow cell from contaminating the sealing plate.

[0029] 3. By arranging collimation holes, the influence of interfering rays on the test results is reduced, and the detection accuracy is improved.

[0030] 4. By integrating the collimation holes, calibration sources, etc. on the calibration disc and driving the calibration disc to rotate by a motor, the online switching of the working modes of detection, calibration and maintenance is realized.

[0031] 5. The device has realized the functions of online detection, purging, calibration and cleaning; the device has good measurement stability and data accuracy, and provides real-time and effective monitoring data for the operation of the post-treatment process.

[0032] In addition, the present application also provides a γ-ray counting measurement system for radioactive solutions, which includes the measurement device of the above claims and the equipment chamber cover plate 2, and the measurement device is fixed below the equipment chamber cover plate 2.

[0033] The γ-ray counting measurement system for radioactive solutions provided by the present application achieves the following technical effects:

[0034] 1. The measurement system adopts a modular design, integrates the measurement device below the equipment chamber cover plate, realizes miniaturization, and shields the rays through the equipment chamber cover plate, improving the safety of operations.

[0035] 2. The measurement device adopted in the measurement system seals the flow cell by setting a sealing plate between the flow cell and the detection component, preventing the radioactive solution in the flow cell from entering the detection component, protecting the detection component, and improving the detection accuracy.

[0036] 3. The measurement device adopted in the measurement system blows the surface of the solution in the flow cell by setting a gas distribution and diversion plate above the sealing plate and the liquid level of the flow cell, preventing the aerosol of the radioactive solution in the flow cell from contaminating the sealing plate.

[0037] 4. The measurement device adopted in the measurement system reduces the influence of interfering rays on the test results by setting collimation holes, improving the detection accuracy.

[0038] 5. The measurement device adopted in the measurement system integrates collimation holes, calibration sources, etc. on the calibration disk, and drives the calibration disk to rotate through a motor, realizing the online switching of the working modes of detection, calibration, and maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] The accompanying drawings forming a part of this application are used to provide a further understanding of the application. The illustrative embodiments and descriptions thereof of the application are used to explain the application and do not unduly limit the application. In the drawings:

[0040] Figure 1 Shows a schematic structural diagram of the γ-ray counting measurement device for radioactive solutions in the present application.

[0041] Among them, the above accompanying drawings include the following reference numerals:

[0042] 10. Flow cell; 30. Purge assembly; 32. Sealing plate; 34. Gas distribution and diversion plate; 40. Calibration disk; 42. Collimation hole; 44. Calibration hole; 52. Transmission shaft; 120. Cleaning liquid inlet; 140. Liquid inlet; 160. Overflow port; 60. Shield; 22. Detector probe; 2. Equipment chamber cover plate. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0043] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments may be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0044] The following further describes the present application in detail with specific embodiments, and these embodiments should not be construed as limiting the scope claimed by the present application. The term "comprising" indicates the presence of features when used, but does not exclude the presence or addition of one or more other features; the terms "lateral", "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present application; in addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0045] In the description, it should be noted that unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be directly connected, or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances. In addition, in the description of the present application, unless otherwise stated, the meaning of "a plurality" is two or more.

[0046] Embodiment 1:

[0047] To solve the problem of contamination of the detection component in the on-line detection of radioactive solutions and improve the detection accuracy, the present application proposes a γ-ray counting measurement device for radioactive solutions. By sealing the radioactive solution, it is avoided that the radioactive solution enters the detection device, thus solving the above problems existing in the on-line detection; in addition, by optimizing the structure of the measurement device, the detection accuracy and operation convenience are further improved, and the radiation hazard of the radioactive solution to the operator is reduced.

[0048] Specifically, as shown in the attached Figure 1 figures, the measurement device includes a flow cell 10 and a detection component. Among them, the detection component is located above the flow cell 10, and the detection component detects the γ-ray count of the radioactive solution flowing into the flow cell 10. In addition, it further includes a purging component 30, and the purging component 30 is located between the detection component and the flow cell 10. The purging component 30 seals the flow cell 10 to restrict the radioactive solution from entering the detection component. Since the γ-rays of the radioactive solution have strong radioactivity, the γ-rays can pass through the purging component 30 and enter the detection component.

[0049] In one embodiment of this application, the purging assembly 30 includes a sealing plate 32 and a gas distribution and diversion plate 34. The sealing plate 32 is used to seal the flow cell 10. The gas distribution and diversion plate 34 is sleeved under the sealing plate 32 and is located above the liquid level of the radioactive solution in the flow cell 10. The gas distribution and diversion plate 34 is used to purge the surface of the radioactive solution in the flow cell 10 to prevent the aerosol in the flow cell 10 from escaping upward and accumulating on the sealing plate 32, thereby improving the detection accuracy.

[0050] In another embodiment of this application, the measuring device further includes a calibration disk 40, and the calibration disk 40 is located between the purging assembly 30 and the detection assembly. The calibration disk 40 is provided with collimation holes 42, and the collimation holes 42 allow gamma rays to enter the detection assembly. By controlling the size of the collimation holes 42, other interfering rays can be blocked from entering the detection assembly, thereby further improving the detection accuracy. Preferably, the diameter of the collimation holes 42 in this application is 1-5 mm.

[0051] The calibration disk 40 has multiple rotational positions. When it is in the first rotational position, the collimation holes 42 communicate with the detection assembly, and the detector probe in the detection assembly is coaxially arranged with the collimation holes. The gamma rays pass through the collimation holes 42 and are received by the detection assembly, and the detection mode is turned on.

[0052] In addition, the calibration disk 40 is also provided with calibration holes 44 and a calibration source located in the calibration holes 44. The calibration holes fix the calibration source. Preferably, the calibration source in this application uses a Cs-137 solid source. In this application, the calibration source and the collimation holes are arranged on the same calibration disk, and the detection and calibration are switched by rotating the calibration disk, which is convenient to operate and simplifies the device structure.

[0053] The calibration disk 40 has a second rotational position. When the calibration disk 40 is in the second rotational position, the calibration source is located below the detection assembly, and the detector probe in the detection assembly is directly opposite to the calibration source in the calibration holes, and the device is calibrated, and the calibration mode is turned on.

[0054] In addition, the calibration disk 40 also has a third rotational position. When the calibration disk 40 is in the third rotational position, the detector probe is directly opposite to other positions outside the collimation holes and the calibration holes on the calibration disk 40, and the calibration disk shields the gamma rays of the radioactive solution in the flow cell, and the detector is taken out for inspection, repair and maintenance.

[0055] To realize the switching of different working modes, the measuring device proposed in this application further includes a motor and a transmission shaft 52. The transmission shaft 52 is connected to the calibration disk 40, and under the action of the motor, the transmission shaft 52 drives the calibration disk 40 to rotate to realize the switching of the calibration and detection modes.

[0056] Preferably, the collimation holes 42 and the calibration holes 44 are symmetrically distributed with respect to the axis of the drive shaft 52. Rotating the drive shaft 52 by 180° can achieve the switching between the detection mode and the calibration mode or between the calibration mode and the detection mode.

[0057] In an embodiment of the present application, a cleaning liquid inlet 120 is provided on the side wall of the flow cell 10, and the cleaning liquid enters the flow cell 10 through the cleaning liquid inlet 120.

[0058] In addition, the flow cell 10 is provided with a liquid inlet 140, and the liquid inlet 140 is located at the bottom of the flow cell 10. Preferably, the liquid inlet 140 is located at the lowest point of the flow cell 10 to ensure that the solution in the flow cell 10 is always the latest solution, and can reflect the total γ radioactivity of the process feed liquid in real time.

[0059] An overflow port 160 is provided on the side wall of the flow cell 10. The radioactive solution enters through the liquid inlet 140 and flows out of the flow cell 10 through the overflow port 160, keeping the liquid level in the flow cell 10 stable at a certain height. Preferably, the position of the overflow port 160 is lower than the position of the cleaning liquid inlet 120.

[0060] Adopting the flow cell structure in this patent ensures that the solution flows at a relatively stable flow rate when measuring the γ-ray count; and when the radioactive background of the measuring device increases, cleaning liquid is added through the cleaning liquid inlet to clean and decontaminate the flow cell.

[0061] In addition, the measuring device further includes a shielding body 60, and the shielding body 60 is sleeved on the detection component to shield the γ-rays and avoid unnecessary radiation exposure to personnel caused by the γ-rays generated by the radioactive solution.

[0062] The detection component includes a detector probe, a photoelectric converter, and a signal acquisition and processing system. Specifically, the detector probe is used to receive the γ-rays emitted through the collimation holes by the high-level radioactive solution in the flow cell. Preferably, the detector probe 22 is a NaI scintillation crystal.

[0063] In summary, the measuring device proposed in this embodiment achieves the following technical effects:

[0064] 1. By arranging a sealing plate between the flow cell and the detection component, the flow cell is sealed to prevent the radioactive solution in the flow cell from entering the detection component, protecting the detection component and improving the detection accuracy.

[0065] 2. By arranging a gas distribution and diversion plate above the liquid level of the sealing plate and the flow cell to blow the surface of the solution in the flow cell, the aerosol contamination of the sealing plate by the radioactive solution in the flow cell is avoided.

[0066] 3. By arranging collimation holes, the influence of interfering rays on the test results is reduced, and the detection accuracy is improved.

[0067] 4. By integrating the collimation holes, calibration sources, etc. onto the calibration disk and driving the calibration disk to rotate through a motor, the online switching of the working modes of detection, calibration, and maintenance is achieved.

[0068] 5. This device realizes the functions of online detection, purging, calibration, and cleaning; the device has good measurement stability and data accuracy, providing real-time and effective monitoring data for the operation of the post-treatment process.

[0069] On the other hand, the present application also proposes a gamma-ray counting measurement system for radioactive solutions. The system includes a measurement device and a cover plate 2 of the equipment chamber. The measurement device is fixed below the cover plate 2 of the equipment chamber. By providing the cover plate of the equipment chamber to shield the rays, the radiation to the detection personnel is further reduced.

[0070] In summary, the measurement system proposed in this embodiment achieves the following technical effects:

[0071] 1. The measurement system adopts a modular design, integrates the measurement device below the cover plate of the equipment chamber, realizes miniaturization, and shields the rays through the cover plate of the equipment chamber, improving the safety of the operation.

[0072] 2. The measurement device adopted in the measurement system seals the flow cell by providing a sealing plate between the flow cell and the detection component, preventing the radioactive solution in the flow cell from entering the detection component, protecting the detection component, and improving the detection accuracy.

[0073] 3. The measurement device adopted in the measurement system blows the surface of the solution in the flow cell by providing a gas distribution and diversion disk above the sealing plate and the liquid level of the flow cell, avoiding the aerosol contamination of the sealing plate by the radioactive solution in the flow cell.

[0074] 4. The measurement device adopted in the measurement system reduces the influence of interfering rays on the test results by providing collimation holes, improving the detection accuracy.

[0075] 5. The measurement device adopted in the measurement system integrates the collimation holes, calibration sources, etc. onto the calibration disk and drives the calibration disk to rotate through a motor, realizing the online switching of the working modes of detection, calibration, and maintenance.

[0076] The above are only the preferred embodiments of the present application and are not used to limit the present application. For those skilled in the art, the present application can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included within the protection scope of the present application.

Claims

1. A γ-ray counting measurement device for radioactive solution, comprising a flow cell (10), a detection assembly, The detection assembly is located above the flow cell (10), and the detection assembly detects the γ-ray count of the radioactive solution flowing into the flow cell (10). It is characterized in that It further includes a purging assembly (30), which is located between the detection assembly and the flow cell (10), and the γ-ray passes through the purging assembly (30) and enters the detection assembly. The purging assembly (30) seals the flow cell (10) to restrict the radioactive solution from entering the detection assembly. The purging assembly (30) includes a sealing plate (32) and a gas distribution and diversion plate (34). The gas distribution and diversion plate (34) is sleeved under the sealing plate (32) and is located above the liquid level of the radioactive solution in the flow cell (10), and is used to purge the surface of the radioactive solution in the flow cell (10) to prevent the radioactive solution aerosol in the flow cell (10) from contaminating the sealing plate (32).

2. The γ-ray counting measurement device for radioactive solution according to claim 1, characterized in that It further includes a calibration disk (40), which is located between the purging assembly (30) and the detection assembly. The calibration disk (40) is provided with collimation holes (42), and the collimation holes (42) allow the γ-ray to enter the detection assembly.

3. The γ-ray counting measurement device for radioactive solution according to claim 2, characterized in that The calibration disk (40) has a first rotation position. When the calibration disk (40) is in the first rotation position, the collimation holes (42) communicate with the detection assembly to turn on the detection mode.

4. The γ-ray counting measurement device for radioactive solution according to claim 2 or 3, characterized in that The diameter of the collimation holes (42) is 1 - 5 mm.

5. The γ-ray counting measurement device for radioactive solution according to claim 4, characterized in that The calibration disk (40) is provided with calibration holes (44) and a calibration source located in the calibration holes (44).

6. The γ-ray counting measurement device for radioactive solution according to claim 2 or 3, characterized in that The calibration disk (40) has a second rotation position. When the calibration disk (40) is in the second rotation position, the calibration source is located below the detection assembly to turn on the calibration mode.

7. The γ-ray counting measurement device for radioactive solution according to claim 2 or 3, characterized in that It further includes a motor-driven transmission shaft (52), and the transmission shaft (52) is connected to the calibration disk (40) to drive the calibration disk (40) to rotate, so as to realize the switching between the calibration and detection modes.

8. The γ-ray counting measurement device for radioactive solution according to claim 7, characterized in that The collimation holes (42) and the calibration holes (44) are symmetrically distributed about the axis where the transmission shaft (52) is located.

9. The γ-ray counting measurement device for radioactive solution according to claim 1 or 2, characterized in that The side wall of the flow cell (10) is provided with a cleaning liquid inlet (120), and the cleaning liquid enters the flow cell (10) through the cleaning liquid inlet (120).

10. The γ-ray counting measurement device for radioactive solution according to claim 1 or 2, characterized in that The flow cell (10) is provided with a liquid inlet (140), and the liquid inlet (140) is located at the bottom of the flow cell (10).

11. The γ-ray counting measurement device for radioactive solution according to claim 9, characterized in that The side wall of the flow cell (10) is provided with an overflow port (160), and the radioactive solution flows out of the flow cell (10) through the overflow port (160) to keep the liquid level in the flow cell (10) stable at a certain height.

12. The γ-ray counting measurement device for radioactive solution according to claim 11, characterized in that The position where the overflow port (160) is located is lower than the position where the cleaning liquid inlet (120) is located.

13. The γ-ray counting measurement device for radioactive solution according to claim 1 or 2, characterized in that It further includes a shielding body (60), and the shielding body (60) is sleeved on the detection assembly to shield the γ-ray.

14. The γ-ray counting measurement device for radioactive solution according to claim 1 or 2, characterized in thatThe detection assembly includes a detector probe (22), and the detector probe (22) is selected from NaI scintillation crystals.

15. A γ-ray counting measurement system for a radioactive solution, characterized in that, It includes the measuring device according to any one of claims 1 - 14 and an equipment room cover plate (2), and the measuring device is fixed under the equipment room cover plate (2).

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