Nuclear medicine radioactive wastewater treatment radiation detection system

Abstract

The utility model discloses a radiation detection system for radioactive wastewater treatment in nuclear medicine, which comprises a deep purification unit formed by connecting a plurality of purification modules in series to form an integrated structure, and each purification module is configured to adopt an ion exchange column. A detection channel I matched with the ion exchange column in length is arranged at the axis of each ion exchange column; a plurality of radiation detectors I are equidistantly arranged in each detection channel I in the length direction of the detection channel I to form a detection array matched with the ion exchange column; wherein each detection array is constructed to obtain an in-purification detection unit matched with the deep purification unit; and the in-purification detection unit is in communication connection with the upper computer. The utility model provides a radiation detection system for nuclear medicine radioactive wastewater treatment, which achieves the purpose of improving the purification quality by monitoring the radioactivity of different positions in the nuclear medicine radioactive wastewater treatment process in real time on line.

Description

Technical Field

[0001] The utility model relates to the field of nuclear wastewater treatment, and more specifically, to a radiation detection system for nuclear medicine radioactive wastewater treatment. Background Art

[0002] Using ion exchange technology to purify nuclear medicine radioactive wastewater can greatly speed up the discharge rate, which is of positive significance for reducing the volume of temporary storage pools and preventing leakage risks.

[0003] Generally speaking, the usual treatment process for nuclear medicine radioactive wastewater mainly includes: solid-liquid separation (pretreatment) and radionuclide adsorption (deep purification) of the separated liquid by a deep purification unit composed of multiple ion exchange columns. In actual applications, it is necessary to dynamically monitor the purification capacity of the deep purification unit and the ion exchange capacity of each ion exchange column, so as to replace or increase or decrease the ion exchange columns in time. In the prior art, such as the nuclear power plant radioactive wastewater ion exchange treatment system with application number: CN201420719911.5, and the radionuclide-containing wastewater treatment equipment with application number: CN202122221987.8, although both use multi-stage ion exchange columns to achieve the treatment of radioactive substances, neither has the function of dynamic monitoring of the ion exchange columns. Utility Model Content

[0004] An object of the present invention is to solve the above-mentioned problems and / or disadvantages and to provide advantages as will be described below.

[0005] To achieve these objectives and other advantages of the present invention, a radiation detection system for treating radioactive wastewater in nuclear medicine is provided, comprising a deep purification unit constructed by connecting a plurality of purification modules in series to form an integrated structure, wherein each purification module is configured to employ an ion exchange column, and a detection channel I adapted to the length of the ion exchange column is provided at the axis of each ion exchange column;

[0006] In each detection channel I, a plurality of radiation detectors I are arranged equidistantly along its length to form a detection array matching the ion exchange column;

[0007] Among them, each detection array is constructed to obtain a purification detection unit that cooperates with the deep purification unit;

[0008] The purification detection unit is in communication connection with the host computer.

[0009] Preferably, it also includes:

[0010] A pre-purification detection unit provided before the deep purification unit;

[0011] A post-purification detection unit provided after the deep purification unit;

[0012] Wherein, the pre-purification detection unit and the post-purification detection unit both include:

[0013] A liquid collecting tank connected to the deep purification unit through a pipeline I, wherein the liquid collecting tank is provided with a detection channel II extending from the upper part of the liquid collecting tank to the center of the liquid collecting tank;

[0014] A radiation detector II is provided in the detection channel II.

[0015] Preferably, the pre-purification detection unit is connected to the pre-treatment unit of the previous stage through pipeline II.

[0016] Preferably, the post-purification detection unit is connected to the subsequent discharge unit via pipeline III.

[0017] Preferably, as an alternative, the purification detection unit includes:

[0018] Radiation detector III installed in detection channel I;

[0019] A lifting mechanism is connected to the radiation detector III in a transmission manner so that the radiation detector III can perform real-time detection of points at different spatial positions at a predetermined time.

[0020] The present invention has at least the following beneficial effects: the present invention dynamically controls the time and space of the deep purification unit by real-time online monitoring of the radioactivity at different positions in the process of treating nuclear medicine radioactive wastewater, and dynamically manages each ion exchange column as needed, so as to achieve the purpose of improving purification quality and controlling costs.

[0021] Other advantages, objectives and features of the present invention will be reflected in part through the following description, and in part will be understood by those skilled in the art through research and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic structural diagram of a radiation detection system for nuclear medicine radioactive wastewater treatment in one embodiment of the present invention;

[0023] Figure 2 This is a structural schematic diagram of a radiation detection system for nuclear medicine radioactive wastewater treatment in another embodiment of the present invention. DETAILED DESCRIPTION

[0024] The present invention will be described in further detail below in conjunction with the accompanying drawings so that those skilled in the art can implement the invention with reference to the description.

[0025] It should be understood that terms such as “having”, “including” and “comprising” used herein do not preclude the existence or addition of one or more other elements or combinations thereof.

[0026] It should be noted that in the description of this utility model, the orientations or positional relationships indicated by terms are based on the orientations or positional relationships shown in the accompanying drawings. This is for the purpose of facilitating the description of this utility model and simplifying the description. It does not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, it should not be construed as limiting this utility model. In addition, the terms "I" and "II" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0027] In the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "provided with", "sleeved / connected", "connected", etc. should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection. It can be a mechanical connection or an electrical connection. It can be a direct connection or an indirect connection through an intermediate medium. It can be a communication between the internal parts of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0028] In addition, in the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it can mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Furthermore, when a first feature is "above," "above," or "above" a second feature, it can mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is higher in level than the second feature. When a first feature is "below," "below," or "below" a second feature, it can mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is lower in level than the second feature.

[0029] This utility model uses real-time online monitoring of the radioactivity at different locations on the ion exchange column used in nuclear medicine radioactive wastewater purification, as well as the radioactivity of the nuclear medicine wastewater before and after purification, to effectively evaluate the dynamic performance of the ion exchange column and to perform quality control on the radioactivity removal effect of the purified liquid. To this end, this utility model designs a radiation detection system for nuclear medicine radioactive wastewater treatment. This system improves purification quality by real-time online monitoring of radioactivity at different locations during the nuclear medicine radioactive wastewater treatment process.

[0030] 1. System composition

[0031] The nuclear medicine radioactive wastewater treatment radiation detection system includes a pre-purification detection unit 1, a purification detection unit 2 and a post-purification detection unit 3. Figure 1 The main function is to monitor the radioactivity at different stages and locations during the purification process of nuclear medicine radioactive waste liquid to achieve the purpose of internal quality control.

[0032] The pre-purification detection unit includes a lead inlet pipe I 10, a liquid collection tank I 11, a detection channel I 12, a radiation detector I 13, and a liquid outlet pipe I 14. Liquid collection tank I consists of a stainless steel chamber and a lead shielding layer. The stainless steel chamber temporarily stores the liquid to be tested, while the lead shielding layer shields the external environment from radiation. The clear liquid to be purified enters liquid collection tank I through inlet pipe I until it is full (this serves two purposes: first, temporary storage attenuates radionuclides, and second, ensures the continuous operation of the downstream deep purification unit). Then, through outlet pipe I, it enters the ion exchange column at the forefront of the deep purification unit. (In actual applications, a liquid level sensor can be installed in liquid collection tank I to detect the liquid level in real time. The level sensor transmits the detected data to a host computer in real time. The host computer determines whether the liquid level in liquid collection tank I meets the required level. If so, it opens the electrically controlled valve on outlet pipe I, allowing the clear liquid to be discharged to the deep purification unit.) Detection Channel I, which runs from the top of liquid collection tank I to its geometric center, houses radiation detector I. The pre-purification detection unit monitors the radioactivity of the clear liquid after solid-liquid separation of nuclear medicine radioactive wastewater in real time. This provides a basis for selecting the number and type of ion exchange columns. Furthermore, the data from the post-purification detection unit is combined with data from the post-purification detection unit to evaluate the dynamic performance of the ion exchange columns.

[0033] As one technical solution, the in-purification detection unit includes: n radiation detector arrays 20 and radiation detector arrays corresponding to n ion exchange columns 21. A detection channel II 22 is provided along the axis of each ion exchange column from top to bottom, for accommodating the radiation detector array. Each radiation detector array contains m probes equidistant in space. This allows an ion exchange column to simultaneously measure the radioactivity at m points at the same time, using probes arranged at different locations. The function of the in-purification detection unit is to monitor the radioactivity at different axial locations within each ion exchange column in real time, to assess the adsorption saturation of the ion exchange column and provide a basis for replacement and maintenance of the ion exchange column. This design approach allows for the dynamic spatial performance of the ion exchange column to be monitored.

[0034] like Figure 2As shown, as another alternative, the radiation detector array in each ion exchange column can be replaced by a mobile radiation detector module. In actual use, each mobile detector module consists of a radiation detector III 23, a flexible cable 24, a fixed pulley 25, a winding reel 26, and a motor 27. The flexible cable passes over the fixed pulley to connect the detector and the winding reel, which is connected to the motor shaft. The forward and reverse rotation of the motor drives the detector up and down along the detector channel to test the radioactivity at different axial positions of the ion exchange column. This allows for the targeted collection of radioactivity at different spatial locations of the ion exchanger at predetermined times and according to predetermined requirements, thereby assessing the adsorption saturation of the ion exchange column and providing a basis for column replacement and maintenance.

[0035] The post-purification detection unit comprises: liquid inlet pipe II 30, liquid collection tank II 31, detection channel III 32, radiation detector II 33, and liquid outlet pipe II 34. Liquid collection tank II is identical in material, structure, and volume to liquid collection tank I. Purified liquid treated by the deep purification unit enters liquid collection tank II through liquid inlet pipe II and flows out of liquid outlet pipe II after it is full. Detection channel III, with the same structure and dimensions as detection channel I, houses radiation detector II. The function of the post-purification detection unit is to monitor the radioactivity of the purified liquid after the radioactivity is extracted and removed from the nuclear medicine radioactive wastewater through the ion exchange column in real time online, evaluate whether the purified liquid meets the discharge requirements, and provide a basis for whether to purify again. At the same time, the dynamic performance of the ion exchange column is evaluated in combination with the data of the pre-purification detection unit, that is, by comparing the intensity of the radioactivity in the waste liquid before and after purification, the purification capacity of the deep purification unit is dynamically grasped in time. Therefore, the solution of the utility model realizes the dynamic grasp of the purification capacity and exchange performance of the deep purification unit in time and space by real-time online monitoring of the radioactivity at different positions of the ion exchange column in the purification of nuclear medicine radioactive wastewater and the radioactivity of the nuclear medicine wastewater before and after purification, thereby realizing dynamic management of the deep purification unit.

[0036] 2. Working Principle

[0037] The radioactive liquid to be purified flows from inlet pipe I through liquid collection tank I, the ion exchange column, and out of liquid collection tank II through outlet pipe II, completing the extraction and removal of radionuclides from the liquid. Detector I of the pre-purification detection unit measures the radioactivity of the liquid in the collection tank in real time, LA, and transmits it to the host computer. Detector II of the post-purification detection unit measures the radioactivity of the purified liquid in the collection tank in real time, LB, and transmits it to the host computer. The detector array of the during-purification detection unit measures the radioactivity of the ion exchange column from top to bottom, Ln0, Ln1, …, Lnm, in real time, and transmits it to the host computer.

[0038] Assume that the nuclide removal rate of the purification device is expressed as K = LA / LB, and K0 is the threshold for minimum purification capacity. The dynamic performance of the deep purification unit is evaluated based on the measured values ​​of each detection unit, as shown in Table 1. Based on the purification capacity and operating mode in Table 1, the purification capacity of the deep purification unit can be dynamically evaluated to determine whether to add or replace ion exchange columns and whether the purification solution needs to be temporarily stored.

[0039] Table 1

[0040]

[0041]

[0042] Assuming the fibers or resins within an ion exchange column are uniformly packed, let the first ion exchange column be L1 and the last ion exchange column be Ln. The radioactivity values ​​measured for L1, distributed axially uniformly from top to bottom, are L11, L12, ..., L1m. The radioactivity values ​​measured for Ln, distributed axially uniformly from top to bottom, are Ln1, Ln2, ..., Lnm. The inlet of an ion exchange column is at the bottom, and the outlet is at the top. This means that the fibers or resin at the bottom of the column are first exposed to the highest radioactivity in the separation solution, resulting in the strongest ion exchange reaction. This reaction gradually weakens as the column's height increases. As the ion exchange column ages, the fibers or resin at the bottom reach saturation first, and L1m reaches a maximum and remains stable. Similarly, L1m-1 ... L11 reach maximums and remain stable in sequence. Therefore, when m measured values ​​remain consistently large and converge, the exchange capacity of the fibers or resin at the top of the ion exchange column has reached saturation, and the column needs to be replaced.

[0043] The host computer evaluates the ion exchange capacity based on the m measurement values ​​of the 1st to nth radiation detectors within a time period. The specific evaluation method is to use the dynamic performance table of the ion exchange column as shown in Table 2.

[0044] Table 2

[0045]

[0046]

[0047] The above solutions are only examples of preferred embodiments, but are not limited thereto. When implementing the present invention, appropriate replacements and / or modifications can be made according to user needs.

[0048] The number of devices and processing scales described herein are used to simplify the description of the present invention. Applications, modifications and variations of the present invention will be apparent to those skilled in the art.

[0049] Although the embodiments of the present invention have been disclosed above, they are not limited to the applications listed in the specification and exemplary embodiments. They can be applied to a variety of fields suitable for the present invention. Further modifications will be readily apparent to those skilled in the art. Therefore, the present invention is not limited to the specific details and illustrations shown and described herein without departing from the general concept defined by the claims and their equivalents.

Claims

1. A nuclear medicine radioactive wastewater treatment radiation detection system, comprising a deep purification unit constructed by connecting multiple purification modules in series to form an integrated structure, characterized in that: Each purification module is configured to use an ion exchange column, and a detection channel I adapted to the length of the ion exchange column is provided at the axis of each ion exchange column; In each detection channel I, a plurality of radiation detectors I are arranged equidistantly along its length to form a detection array matching the ion exchange column; Among them, each detection array is constructed to obtain a purification detection unit that cooperates with the deep purification unit; The purification detection unit is in communication connection with the host computer.

2. The nuclear medicine radioactive wastewater treatment radiation detection system according to claim 1, characterized in that: Also includes: A pre-purification detection unit provided before the deep purification unit; A post-purification detection unit provided after the deep purification unit; Wherein, the pre-purification detection unit and the post-purification detection unit both include: A liquid collecting tank connected to the deep purification unit through a pipeline I, wherein the liquid collecting tank is provided with a detection channel II extending from the upper part of the liquid collecting tank to the center of the liquid collecting tank; A radiation detector II is provided in the detection channel II.

3. The nuclear medicine radioactive wastewater treatment radiation detection system according to claim 2, characterized in that: The pre-purification detection unit is connected to the pre-treatment unit of the previous stage through pipeline II.

4. The nuclear medicine radioactive wastewater treatment radiation detection system according to claim 2, characterized in that: The post-purification detection unit is connected to the subsequent discharge unit via pipeline III.

5. The nuclear medicine radioactive wastewater treatment radiation detection system according to claim 1, characterized in that: As an alternative, the purification detection unit includes: Radiation detector III installed in detection channel I; A lifting mechanism is connected to the radiation detector III in a transmission manner so that the radiation detector III can perform real-time detection of points at different spatial positions at a predetermined time.

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