A nuclear medicine diagnostic radioactive waste liquid natural decay tank processing system

Abstract

The utility model discloses a kind of nuclear medicine diagnosis radioactive waste liquid natural decay pool processing system, comprising: waste liquid processing unit, control unit matched with waste liquid processing unit, radiation protection unit, video monitoring unit, detection unit, flushing unit, still including the ventilation unit of waste liquid processing unit space is carried out ventilation treatment;Wherein, the waste liquid processing unit includes n parallel waste liquid buffer tank;Waste liquid processing unit, radiation protection unit, detection unit, flushing unit are constructed to obtain a natural decay pool processing subsystem;Two sets of structures same are provided at nuclear medicine diagnosis radioactive waste liquid output end, respectively to the classification buffer decay of containing 18 F、 99m Tc waste liquid subsystem.The utility model respectively uses two sets of structures same subsystem to handle respectively, so that the processing process of two can respectively dispose containing 18 F、 99m Tc waste liquid, and buffer tank in subsystem can be set according to the production amount of different waste liquid respectively, to control its equipment cost and processing efficiency.

Description

Technical Field

[0001] This utility model relates to the field of nuclear waste treatment technology. More specifically, this utility model relates to a natural decay pool treatment system for radioactive waste from nuclear medicine diagnostics. Background Technology

[0002] The main source of radioactive waste in nuclear medicine diagnostics is the excrement of patients after radionuclide imaging, primarily containing radionuclides with shorter half-lives. 99m Tc, 18 F has half-lives of 6.02 hours and 110 minutes, respectively. In September 2021, the Environmental Protection Department issued HJ1188-2021 "Radiation Protection and Safety Requirements for Nuclear Medicine," which made new regulations on various aspects of decay pools in nuclear medicine departments. The regulations specify two main treatment methods for storage in trough-type decay pools:

[0003] Treatment method a: Radioactive waste liquid containing nuclides with a half-life of less than 24 hours can be directly discharged after being temporarily stored for more than 30 days;

[0004] Treatment method b involves storing radioactive waste containing nuclides with a half-life greater than 24 hours for more than 10 times the longest half-life (more than 180 days for iodine-131-containing nuclides). After monitoring results are approved by the regulatory authority, the waste shall be discharged in accordance with the provisions of GB 18871, section 8.6.2. The total α concentration at the total discharge outlet shall not exceed 1 Bq / L, the total β concentration shall not exceed 10 Bq / L, and the radioactivity concentration of iodine-131 shall not exceed 10 Bq / L.

[0005] According to the aforementioned regulations, nuclear medicine waste containing short-period nuclides with a half-life of less than 24 hours is treated using method a. The advantages of method a include simplified management and a longer decay margin that eliminates the need for radioactivity detection. This method is indeed advantageous when the number of patients diagnosed in the nuclear medicine department is small. However, with the rapid development of nuclear medicine technology and the increasing number of patients visiting nuclear medicine departments, the amount of nuclear medicine waste containing short-period nuclides with a half-life of less than 24 hours is also increasing. If this treatment method continues, the volume of the natural decay pool will need to increase until a traditional concrete decay pool structure can meet the requirements.

[0006] The traditional waste liquid temporary storage and decay scheme that uses A pool and B pool of the same volume to work alternately with "one for use and one for storage" is used. The volume calculation method of the natural decay pool is shown in Equation (1).

[0007] V=Q×T×(1+k) (1)

[0008] In the formula:

[0009] V: Volume of a single natural decay pool (liters);

[0010] Q: Daily radioactive waste discharge volume (liters) of the patient;

[0011] T: Natural decay time (days);

[0012] k: a safety factor of 10%-20% (to avoid waste liquid overflow caused by factors such as sudden increase in waste liquid discharge and delay in waste liquid radioactivity detection).

[0013] If treatment method a is adopted, and the hospital contains 18 F (half-life of 110 minutes) and 99m The daily discharge of nuclear medical waste liquid from short-period radionuclides (Tc with a half-life of 6.02 hours) is Q = 500 liters. If treated according to HJ1188-2021 standard method a, then T = 30 days. If K is taken as an intermediate value of 0.15, calculated using formula (1), the required volume is 34.5 m³. 3 There are two natural decay pools (pool A and pool B).

[0014] If treatment method b is used, according to standards, the waste liquid needs to be stored for 10 half-lives of short-period nuclides, and can only be released after passing third-party radioactivity testing. To increase the natural decay margin, the temporary storage time for the waste liquid is extended from 10 half-lives to 20 half-lives (after 10 and 20 half-lives of decay, the radioactivity of the nuclide becomes half of its original value, respectively). 10 and 1 / 2 20 ,).

[0015] Furthermore, under treatment method b, two additional treatment schemes can be adopted: "mixed collection + temporary storage + decay" and "separate collection + temporary storage + decay". These two methods will be further explained below:

[0016] The "hybrid collection + temporary storage + decay" processing scheme involves... 18 F and 99m The waste liquid of short-period Tc nuclides is collected and temporarily stored, at which point the natural decay time T is... 99m 20 times the Tc half-life (T is the longest half-life of the radionuclide contained in the waste liquid, for those containing only...) 18 F (half-life of 110 minutes) and 99m Waste liquid with Tc (half-life of 6.02 hours) was selected. 99m The half-life of Tc is T = 20 * 6.02 / 24 = 5.02 days. In the traditional waste liquid temporary storage and decay scheme where tanks A and B of the same volume alternate between use and storage, K is taken as an intermediate value of 0.15. Calculated using formula (1), a volume of 5.8 m³ is required. 3 There are two natural decay pools (pool A and pool B).

[0017] The "categorized collection + temporary storage + decay" processing scheme is to process the contents of the collection into categories. 18 F and 99m The nuclear medicine waste liquids of short-period Tc nuclides were collected and temporarily stored separately, and their natural decay times were respectively... 18 F and 99m Tc is 20 times that of T, therefore T F =20*110 / 60 / 24=1.53 days, T Tc =20*6.02 / 24=5.02 days. Using the same scheme of alternating use of pools A and B with the same volume, K is taken as the median value of 0.15. Using formula (1), the processing time for [the following data is missing from the original text] is calculated. 18 F's nuclear medicine waste liquid requires a volume of 0.88m³. 3 There are two decay pools (pool A and pool B). The process includes... 99m Tc requires a nuclear medicine waste liquid volume of 2.9m³. 3 There are two decay pools (pool C and pool D).

[0018] The above analysis shows that when hospital nuclear medicine diagnosis produces 18 F and 99m When each 500 liters of Tc wastewater is used, the two volumes of nuclear medical wastewater required to treat the same volume using treatment method a are 34.5 m³ each. 3 The decay pool is a large-capacity decay pool, typically constructed of concrete. Its disadvantages include large space requirements, high risk of leakage, difficulty in expansion, and difficulty in decommissioning. The hybrid treatment scheme (method b) requires two pools with a total volume of 5.8 m³. 3 The decay pool; the classification treatment scheme using treatment method b requires two volumes of 0.88m³. 3 The decay pool and two 2.9m³ volumes 3 The decay cell. This small-volume decay cell can be constructed of stainless steel, which overcomes the disadvantages of large-volume concrete decay cells.

[0019] The current best practice for treating radioactive waste from nuclear medicine diagnostics is "mixed collection + temporary storage + purification": ion exchange technology is used to adsorb radionuclides from the waste, thus accelerating discharge. This method is suitable for treating radionuclides with longer half-lives, such as... 131 I (with a half-life of 8.02 days) has a clear advantage, but if we combine products with different half-lives... 131 I, 18 F and 99m Treating Tc radionuclide waste liquid using a "mixed collection + temporary storage + purification" method would greatly increase the complexity and operating cost of a rapid treatment system for nuclear medical waste liquid.

[0020] Therefore, to improve the treatment capacity of waste liquid containing short-period radionuclides generated from nuclear medicine diagnostics and reduce operating costs, this invention adopts a standard HJ1188-2021 trough-type decay pool to temporarily store nuclear medicine waste liquid, and establishes a novel natural decay pool treatment system using the "classified collection + temporary storage + decay" treatment scheme in method b, to solve the contradiction between the increasing number of patients and insufficient waste liquid treatment capacity. This differs from traditional concrete natural decay pools which use a "mixed collection + temporary storage + decay" method. 18 F, 99m Tc and 131 Nuclear medical waste will be treated separately using a stainless steel natural decay tank containing short-lived radionuclides. 18 F or 99m Tc waste liquid is defined as being collected by "classification + buffering + decay". The advantage of the "classification + buffering + decay" method is that the natural decay pool has a small volume and the de-control time is short. Utility Model Content

[0021] One object of this invention is to solve the above-mentioned problems and / or defects, and to provide the advantages that will be described later.

[0022] To achieve these objectives and other advantages of this utility model, a nuclear medicine diagnostic radioactive waste liquid natural decay pool treatment system is provided, comprising: a waste liquid treatment unit, a control unit, a radiation protection unit, a video monitoring unit, a detection unit, a flushing unit that cooperate with the waste liquid treatment unit, and a ventilation unit for air exchange treatment of the space where the waste liquid treatment unit is located.

[0023] The waste liquid treatment unit includes n waste liquid buffer tanks connected in parallel;

[0024] The waste liquid treatment unit, radiation protection unit, detection unit, and rinsing unit together form a subsystem for natural decay pool treatment;

[0025] Two identical sets of equipment are installed at the output end of the radioactive waste liquid for nuclear medicine diagnostics, one for treating the waste containing radioactive waste liquid. 18 F, 99m A subsystem for classifying and buffering decay of Tc waste liquid.

[0026] Preferably, the waste liquid treatment unit is connected to the output end of the radioactive waste liquid for nuclear medicine diagnosis via an inlet pipe, and the waste liquid treatment unit is connected to the inlet end of the sewage network via a drain pipe;

[0027] The inlet pipe is connected to the inlet of each waste liquid buffer tank through a corresponding branch pipe I, and the outlet pipe is connected to the outlet of each waste liquid buffer tank through a corresponding branch pipe II.

[0028] The inlet pipe is equipped with valve I at the front end position that matches the output end of the radioactive waste liquid for nuclear medicine diagnosis;

[0029] Both branch pipe I and branch pipe II are equipped with valve II and valve III, which are connected to the control unit for communication.

[0030] A sludge pump is also installed on the drain pipe.

[0031] Preferably, the detection unit includes:

[0032] A level gauge for monitoring the liquid level in each waste liquid buffer tank;

[0033] Radiation detector I for monitoring the radioactivity in each waste liquid buffer tank;

[0034] Radiation detector II is used to monitor environmental radiation outside the waste liquid buffer tank on site.

[0035] Preferably, the ventilation unit is configured to include: an intake blower installed at the on-site air inlet and an exhaust blower installed at the on-site air outlet.

[0036] Preferably, the rinsing unit is configured to include:

[0037] Pumps that introduce cleaning water into each waste liquid buffer tank to drain retained solids;

[0038] The water pump is connected to the inlet pipe via a matching connecting pipe I;

[0039] The water pump is connected to an external water source through a matching connecting pipe II;

[0040] Valve IV is installed on the connecting pipeline I.

[0041] This utility model has at least the following beneficial effects: This utility model addresses the issues arising from nuclear medicine diagnostics, including... 18 F and 99m The short-half-life waste liquid of Tc is treated separately using two subsystems, which achieves two effects:

[0042] Firstly, because this invention separates the waste liquid with a long half-life from the waste liquid, it effectively reduces the complexity and operating cost of the nuclear medical waste liquid treatment system compared with the "mixed collection + temporary storage + purification" treatment method.

[0043] Secondly, this utility model is applicable to two types of... 18 F, 99m The Tc waste liquid was treated using two separate subsystems with identical structures. Compared with the "mixed collection + temporary storage + decay" method, this method can reduce the volume of the natural decay pool and improve the treatment efficiency.

[0044] Other advantages, objectives and features of this invention will be partly apparent from the following description, and partly understood by those skilled in the art through study and practice of this invention. Attached Figure Description

[0045] Figure 1 This is a schematic diagram of the structure of a nuclear medicine diagnostic radioactive waste natural decay pool treatment system in one embodiment of the present invention;

[0046] Figure 2 This is a schematic diagram of the structure of the waste liquid treatment unit and other units in one embodiment of the present invention;

[0047] Figure 3 This diagram illustrates the efficient classification and treatment method for radioactive waste liquids used in nuclear medicine diagnostics according to this utility model.

[0048] Figure 4 This is a flowchart of the waste liquid buffer decay subsystem of this utility model. Detailed Implementation

[0049] The present invention will now be described in further detail with reference to the accompanying drawings, so that those skilled in the art can implement it based on the description.

[0050] It should be understood that terms such as “having,” “comprising,” and “including” as used herein do not exclude the presence or addition of one or more other elements or combinations thereof.

[0051] It should be noted that in the description of this utility model, the terms indicating orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of 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.

[0052] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "installed", "equipped with", "sleeved / connected", "connected", etc., should be interpreted broadly. 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 connection within two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0053] Furthermore, in this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Moreover, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0054] Example 1

[0055] A nuclear medicine diagnostic radioactive waste liquid natural decay pool treatment system, the system layout of which is as follows: Figure 1 Structural layout such as Figure 2 As shown, it includes: a waste liquid treatment unit 1, a control unit 2, a radiation protection unit 3, a video monitoring unit 4, a detection unit 5, a flushing unit 6, and a ventilation unit 7 for air exchange treatment of the space where the waste liquid treatment unit is located.

[0056] The video monitoring unit 4 contains multiple cameras installed at the system's working site. Its main function is to collect and temporarily store on-site video signals from each unit of the nuclear medical waste liquid treatment system, allowing management personnel to trace and detect abnormal situations on-site through the video signals.

[0057] Control unit 2 includes a field touch control and remote control platform, consisting of an input module, a communication module, a control module, an execution module, a display module, a timing module, and an alarm module. The input module receives operator commands and the detection results of liquid level and radioactivity from the detection unit, serving as the setpoint and feedback values ​​for the control unit. System parameter settings are also achieved through the input module. The communication module transmits the setpoint and feedback values ​​to the control module. The control module receives the setpoint and feedback values, generates control signals, and outputs them to the execution module through the communication module. In practical applications, the control module acts as a mature, independent unit, primarily implementing monitoring, analysis, and execution control functions through hardware and / or software. The hardware portion utilizes an MCU main control chip (such as CC2530) and an ARM processor platform. The software portion is based on existing technologies, such as the integrated rapid treatment system for nuclear medical radioactive wastewater (patent application number CN202311036067.6) and the pretreatment system and application method for solid-liquid separation of nuclear medical radioactive wastewater (patent application number CN202311036063.8), which are not described further here. The execution module consists of all the valves and pumps in each unit. It receives control signals to adjust the liquid level in the waste liquid buffer tank and starts / stops (closes) the pumps, fans, and valves in each unit. The display module is mainly used for real-time display of operator commands, on-site images, process parameters, and workflow. The timing module starts timing when the system detects a high liquid level in the waste liquid buffer tank and the corresponding inlet valve is closed (waste liquid buffer tank sealing). After 36.7 hours, an audible and visual indication indicates that the natural decay of the nuclide is complete, and third-party radioactivity detection can be initiated. The alarm module generates audible and visual signals when any parameters become abnormal during system operation, prompting operators to handle the situation promptly.

[0058] The waste liquid treatment unit includes n (n≥2) waste liquid buffer tanks 10 (also called stainless steel natural decay tanks) with the same structure and external lead coating, connected in parallel. If the number of natural decay tanks is n, to ensure continuity, it is necessary to ensure that after the waste liquid fills the n natural decay tanks, the first natural decay tank to be filled has reached the required temporary storage time. Then, the time to fill the next n-1 natural decay tanks is at least the time T of natural decay of the waste liquid.

[0059] The volume V of a single natural decay pool (waste liquid buffer tank) can be calculated from formula (1) as shown in formula (2):

[0060] V=Q×T / (n-1)×(1+k) (2)

[0061] In the above formula, V is the volume of a single natural decay pool (liters), Q is the daily radioactive waste discharge of the patient (liters), T is the natural decay time (days), n is the number of natural decay pools, n≥2, and k is a safety factor of 10%-20%.

[0062] The total volume of all natural decay pools is calculated as shown in equation (3):

[0063] Vn=n×V=Q×T×n / (n-1)×(1+k) (3)

[0064] As can be seen from formula (3), the larger n is, the smaller the total volume of the natural decay pool; similarly, taking the temporary storage and treatment of waste liquid in any hospital as an example, using method b to separately treat a daily discharge of 500 liters of waste liquid containing... 18 F waste liquid. The calculation results of V for a single natural decay pool and Vn for all natural decay pools when n has different values ​​are shown in Table 1 (K = 15%).

[0065] Table 1

[0066]

[0067]

[0068] If the number of patients seeking treatment increases rapidly, the amount of waste liquid temporarily stored can be increased by adding natural decay tanks. If the number of natural decay tanks is n, to ensure continuity, it is necessary to ensure that after the waste liquid fills n natural decay tanks, the first m (1≤m<n) decay tanks have reached the required temporary storage time. Therefore, the time to fill the remaining nm natural decay tanks is at least the time T of the waste liquid's natural decay. The calculation method for the volume V of a single natural decay tank (waste liquid buffer tank) is shown in equation (4) from formula (2).

[0069] V=Q×T / (nm)×(1+k) (4)

[0070] In the above formula, V is the volume of a single natural decay pool (liters), Q is the daily radioactive waste discharge of the patient (liters), T is the natural decay time (days), n is the number of natural decay pools, n≥2, m is the number of natural decay pools, m≥1, and k is a safety factor of 10%-20%.

[0071] The total volume of all natural decay pools is calculated as shown in equation (5):

[0072] Vn=n×V=Q×T×n / (nm)×(1+k) (5)

[0073] In practice, the waste liquid treatment unit is connected to the nuclear medical waste liquid discharge outlet, the flushing unit, and the sewage network via inlet pipes, flushing water pipes, and outlet pipes, respectively. The waste liquid buffer tanks are cuboid water tanks made of stainless steel; the number n can be determined based on the waste liquid treatment volume and the volume of the buffer tanks. The n waste liquid buffer tanks sequentially receive nuclear medical waste liquid in real time. When the liquid level is high, the tank is sealed. After 36.7 hours of sealing, a sample is taken for testing and discharge if it passes; otherwise, the sealing time is extended until it passes the test and is discharged. A level gauge is placed inside the waste liquid buffer tank for real-time online monitoring of the liquid level and feedback to the control unit. Radiation detector I is placed inside the waste liquid buffer tank for real-time online detection of the radioactivity of the buffer liquid and feedback to the control unit. The sampling port is the sampling channel for monitoring the activity of the buffer waste liquid. Radiation detector II is placed outside the on-site waste liquid buffer tanks for real-time online detection of the environmental radiation dose rate. Valves placed on the pipelines receive control commands from the control unit to open or close the pipelines. The main function of the waste liquid collection / buffering / discharge unit is to adopt a "first-in, first-out" stacking operation mode for waste liquid, receive waste liquid in real time, buffer it for 36.7 hours until it has completed natural decay, and discharge it after passing the radioactivity test.

[0074] The waste liquid treatment unit 1, radiation protection unit 3, detection unit 5, and rinsing unit 6 constitute a subsystem 8 for natural decay pool treatment. In practical applications, the radiation protection unit 1 consists of a lead layer wrapped around the surface of the waste liquid buffer tank 10 and its connecting pipes. The thickness of the lead layer is determined by the maximum activity of the buffered waste liquid. The main function of the radiation protection unit is to shield the radiation generated by the buffered waste liquid, ensuring the radiation safety of personnel and the environment.

[0075] Two identical sets of equipment are installed at the output end 9 of the radioactive waste liquid for nuclear medicine diagnostics, one for processing radioactive waste containing... 18 Subsystem I80, which buffers and decays waste liquid, for... 99m Subsystem II81 for buffering decay of Tc waste liquid.

[0076] Specifically, this solution employs a "classification and collection + temporary storage + decay" approach in the efficient classification and treatment process of radioactive waste liquids used in nuclear medicine. Figure 1 As shown, from an overall structural perspective, the nuclear medicine diagnostic radioactive waste natural decay pool treatment system includes components with identical structure and function for treating radioactive waste containing... 18 Subsystem I80, which buffers and decays waste liquid, for... 99m The Tc waste liquid is buffered and decayed by a subsystem II81, which includes a shared video monitoring unit 4, control unit 2, and ventilation unit 7. Each subsystem includes: a waste liquid treatment unit 1, a radiation protection unit 3, a detection unit 5, and a rinsing unit 6.

[0077] Working principle: such as Figure 3 As shown, 18 F waste liquid buffer decay subsystem and99m The Tc waste liquid buffer decay subsystems operate on the same workflow, except their decay times are 36.7 hours and 120.4 hours respectively. The following description uses the core... 18 The workflow of the F waste liquid buffer decay subsystem is explained, such as... Figure 4 As shown, its workflow is as follows:

[0078] Step 1: Waste liquid collection

[0079] Includes 18 Waste liquid F enters the first waste liquid buffer tank in real time through the inlet pipe. When the liquid level is high, the waste liquid is switched to the second waste liquid buffer tank until the nth waste liquid buffer tank is full.

[0080] Step 2: Waste liquid buffering

[0081] The timer starts when the waste liquid buffer tank reaches a high level and is sealed.

[0082] Step 3: Waste liquid release

[0083] The timer has reached 36.7 hours. 18 After the F nuclide completes its natural decay, it passes the radioactivity test conducted by a third-party organization and is then discharged from the drain pipe into the hospital's sewage network.

[0084] Step 4: Rinse

[0085] The solids remaining in the waste liquid buffer tank are flushed out.

[0086] Example 2

[0087] This second embodiment is a preferred embodiment of the present invention, and its specific structure is as follows: Figures 1-2 As shown, it discloses the following improvements based on implementation method 1:

[0088] The waste liquid treatment unit 1 is connected to the nuclear medicine diagnostic radioactive waste liquid output end 9 through the inlet pipe 11, and the waste liquid treatment unit 1 is connected to the sewage network inlet end through the drain pipe 12.

[0089] The inlet pipe 11 is connected to the inlet of each waste liquid buffer tank 10 through a corresponding branch pipe I 13, and the outlet pipe 12 is connected to the outlet of each waste liquid buffer tank through a corresponding branch pipe II 14.

[0090] The inlet pipe 11 is equipped with a valve I 15 at the front end position that cooperates with the nuclear medicine diagnostic radioactive waste liquid output end 9. The valve I 14 is used to control whether the waste liquid treatment unit 1 is in working state. When the valve I 15 is open, waste liquid is sent to each waste liquid buffer tank.

[0091] Branch pipe I 13 and branch pipe II 14 are each equipped with valve II 16 and valve III 17, which are connected to control unit 2. Valve II 16 is used to switch the working state of each waste liquid buffer tank 10. When the corresponding valve II 16 on branch pipe I 13 is opened, the corresponding waste liquid buffer tank 10 is in working state. The function of valve III 17 is to switch whether to discharge sludge to the outside after decay is completed by the opening state of valve III 17.

[0092] The drain pipe is also equipped with a sludge pump 18, and the sludge to be discharged is pumped out by the sludge pump and transported to the sewage network. Each waste liquid buffer tank 10 is also equipped with a corresponding sampling port, which is used by third-party institutions and users to sample the waste liquid inside each waste liquid buffer tank 10 as needed, and to test the activity value of the waste liquid to determine whether its decay has reached the index.

[0093] Example 3

[0094] This third embodiment is a preferred embodiment of the present invention, and its specific structure is as follows: Figures 1-2 As shown, it discloses the following improvements based on implementation method 1:

[0095] The detection unit 5 includes:

[0096] A level gauge 50 is used to monitor the liquid level of each waste liquid buffer tank 10;

[0097] Radiation detector I51 for monitoring the radioactivity in each waste liquid buffer tank 10;

[0098] Radiation detector II52 is used to monitor environmental radiation outside the waste liquid buffer tank at the site.

[0099] Working Principle: The detection unit 5 includes a level gauge 50, radiation detector I 51, and radiation detector II 52 inside the waste liquid buffer tank. Its main function is to collect and display the system's process parameters and feed them back to the control unit. This allows the control unit to switch the operating state of the waste liquid buffer tank based on the level gauge's height information (e.g., when one waste liquid buffer tank reaches a high level, the valve on the corresponding inlet pipe is closed, and then the valves on other idle waste liquid buffer tanks are opened, completing the switching of operating states between the waste liquid buffer tanks). Additionally, the radiation detectors are used to detect the activity value of the waste liquid during later decay stages to determine if its decay has reached the target. Radiation detector II 52 is used to monitor the environmental radiation outside the waste liquid buffer tank in real time. Operators can use this monitoring data to determine whether on-site inspection and manual operation are permitted.

[0100] Example 4

[0101] This embodiment 4 is a preferred embodiment of the present invention, and its specific structure is as follows: Figures 1-2As shown, it discloses the following improvements based on implementation method 1:

[0102] The ventilation unit 7 is configured to include: an intake blower 70 installed at the on-site air inlet and an exhaust blower 71 installed at the on-site air outlet.

[0103] The working principle of the ventilation unit includes an intake blower, an exhaust blower, an on-site air inlet, an air outlet, and corresponding pipes. Its main function is to facilitate the cross-flow of odorous gases generated by the fermentation and decomposition of organic matter in the waste liquid in the waste liquid buffer tank with the external air (i.e., the treatment site is usually laid out in an isolated manner (such as setting up an independent room where the treatment system is located, and the on-site air inlet and outlet are arranged relatively to facilitate cross-flow), while avoiding the accumulation of flammable gases that may be generated on-site and cause safety accidents.

[0104] Example 5

[0105] This embodiment 4 is a preferred embodiment of the present invention, and its specific structure is as follows: Figure 2 As shown, it discloses the following improvements based on implementation method 1:

[0106] The flushing unit 6 is configured to include:

[0107] Pump 60 inputs cleaning water into each waste liquid buffer tank 10 to drain the retained solids;

[0108] The water pump 60 is connected to the inlet pipe 11 through a matching connecting pipe I 61;

[0109] The water pump 60 is connected to an external water source through a matching connecting pipe II 62;

[0110] A valve Ⅲ63 is installed on the connecting pipeline Ⅰ61.

[0111] Working principle: The flushing unit consists of a water pump, an external water source, valves and connecting pipelines. Its main function is to connect the external water source with the waste liquid treatment unit 1 through the connecting pipelines. When valve III is opened, the water is pumped out by the power of the water pump and transported to the waste liquid buffer tank through the connecting pipelines to flush out the solids retained in the waste liquid buffer tank.

[0112] The above solutions are merely illustrative examples of preferred embodiments, but are not limited thereto. When implementing this invention, appropriate substitutions and / or modifications can be made according to the user's needs.

[0113] The number of devices and processing scale described herein are for the purpose of simplifying the description of this utility model. Applications, modifications, and variations of this utility model will be readily apparent to those skilled in the art.

[0114] Although embodiments of this utility model have been disclosed above, they are not limited to the applications listed in the specification and embodiments. It can be applied to various fields suitable for this utility model. Other modifications can be readily implemented by those skilled in the art. Therefore, without departing from the general concept defined by the claims and their equivalents, this utility model is not limited to the specific details and examples shown and described herein.

Claims

1. A natural decay pool treatment system for radioactive waste liquid from nuclear medicine diagnostics, comprising: A waste liquid treatment unit, and a control unit, a radiation protection unit, a video monitoring unit, a detection unit, and a flushing unit that cooperate with the waste liquid treatment unit, characterized in that it also includes a ventilation unit for air exchange treatment of the space where the waste liquid treatment unit is located; The waste liquid treatment unit includes n waste liquid buffer tanks connected in parallel; The waste liquid treatment unit, radiation protection unit, detection unit, and rinsing unit together form a subsystem for natural decay pool treatment; Two identical sets of equipment are installed at the output end of the radioactive waste liquid for nuclear medicine diagnostics, one for treating the waste containing radioactive waste liquid. 18 F, 99m A subsystem for classifying and buffering decay of Tc waste liquid.

2. The nuclear medicine diagnostic radioactive waste natural decay pool treatment system as described in claim 1, characterized in that, The waste liquid treatment unit is connected to the output end of the radioactive waste liquid for nuclear medicine diagnosis via an inlet pipe, and the waste liquid treatment unit is connected to the inlet end of the sewage network via a drain pipe. The inlet pipe is connected to the inlet of each waste liquid buffer tank through a corresponding branch pipe I, and the outlet pipe is connected to the outlet of each waste liquid buffer tank through a corresponding branch pipe II. The inlet pipe is equipped with valve I at the front end position that matches the output end of the radioactive waste liquid for nuclear medicine diagnosis; Both branch pipe I and branch pipe II are equipped with valve II and valve III, which are connected to the control unit for communication. A sludge pump is also installed on the drain pipe.

3. The nuclear medicine diagnostic radioactive waste natural decay pool treatment system as described in claim 1, characterized in that, The detection unit includes: A level gauge for monitoring the liquid level in each waste liquid buffer tank; Radiation detector I for monitoring the radioactivity in each waste liquid buffer tank; Radiation detector II is used to monitor environmental radiation outside the waste liquid buffer tank on site.

4. The nuclear medicine diagnostic radioactive waste natural decay pool treatment system as described in claim 1, characterized in that, The ventilation unit is configured to include: an intake blower installed at the on-site air inlet and an exhaust blower installed at the on-site air outlet.

5. The nuclear medicine diagnostic radioactive waste natural decay pool treatment system as described in claim 1, characterized in that, The rinsing unit is configured to include: Pumps that introduce cleaning water into each waste liquid buffer tank to drain retained solids; The water pump is connected to the inlet pipe via a matching connecting pipe I; The water pump is connected to an external water source through a matching connecting pipe II; Valve IV is installed on the connecting pipeline I.

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