Radioactive waste liquid treatment method and system for nuclear medicine department

Abstract

The invention discloses a radioactive waste liquid treatment method and system for the nuclear medicine department, and belongs to the technical field of waste liquid treatment of the nuclear medicine department. The method comprises the steps that waste liquid is discharged into a pre-storage container, concentration detection and nuclide type detection are conducted, and the waste liquid with the concentration detection result lower than a specified limit value is directly discharged into a medical waste water pipeline; other waste liquids are classified and discharged into the corresponding decay tanks according to the half-life periods of nuclide types, the storage time of the waste liquids in the decay tanks is different according to different half-life periods, and the waste liquids in the corresponding decay tanks are discharged in time after the storage time is reached. According to the invention, the amount of the waste liquid actually entering the decay tank is reduced from the source end, and the waste liquid is discharged into the decay tank in a classified manner based on nuclide types, so that the storage time of the waste liquid corresponding to nuclides with short half-life periods in the decay tank can be shortened, the discharge efficiency of most of the waste liquid is improved, and the amount of the waste liquid in the decay tank is effectively reduced.

Description

Technical Field

[0001] The invention relates to the technical field of nuclear medicine waste liquid treatment, and in particular to a nuclear medicine radioactive waste liquid treatment method and system. Background Art

[0002] The radioactive waste liquid of nuclear medicine mainly comes from the diagnosis and treatment process of nuclear medicine. Such as the excrement produced by patients after taking or injecting radioactive drugs, containers for isotopes, cleaning water in the laboratory, labeled compounds, etc. Radioactive nuclides have their own inherent decay laws, and currently most of them use natural decay to reduce and eliminate them. Generally speaking, patients taking radioactive isotopes 131 I. Injection 99m Tc, 18 Excreta produced after administration of F-labeled radiopharmaceuticals, especially in hospitalized patients taking large doses 131 Radioactive domestic water such as urination, defecation and showering after use must be discharged into a special decay pool for decay until it decays to the national emission limit before being discharged. 131 I has a relatively long half-life of 8.02 days. According to regulatory requirements, it must be stored in a decay pool for no less than 180 days or its activity concentration must be lower than 10 Bq / L.

[0003] With the rapid development of nuclear medicine imaging diagnosis and radionuclide therapy in nuclear medicine, the amount of radioactive waste liquid caused by patients' urination, defecation and showering has increased dramatically. In order to meet the requirements of relevant national environmental protection standards, regulations and guidelines, almost all nuclear medicine departments in China currently adopt the method of continuously expanding the volume of decay pools, that is, in the treatment of radioactive waste liquid in nuclear medicine, the main method is to expand the decay pool to cope with the increasing demand for radioactive diagnosis and treatment. Although this method is the simplest and most effective, in order to meet the sharp increase in the amount of radioactive waste liquid, the volume of the decay pool expanded in accordance with the national radiation protection standards has increased sharply, even reaching a volume of several hundred cubic meters, and it is not easy to renovate and expand the old decay pool. The construction of new wards brings huge costs. In addition to the cost of the decay pool itself, there is also the cost of the site. In particular, many hospitals are located in densely populated urban areas, which further increases the difficulty of expansion. Therefore, the way of responding to the increasing demand for radioactive diagnosis and treatment by expanding the decay pool is a huge burden for hospitals, especially in densely populated urban areas, it is more difficult to build such a large radioactive decay pool, which seriously restricts the development of nuclear medicine with important diagnostic and treatment value.

[0004] In the face of this problem, some hospitals have collected online tests or random inspections and followed the " 131The radioactive waste liquid in the decay pool that has reached the standard is discharged in time by the method of "activity concentration <10Bq / L", which can reduce the storage time of some waste liquid in the decay pool, and the total amount of waste liquid in the decay pool is also reduced accordingly. Although this method improves the discharge efficiency of the waste liquid in the decay pool by means of detection, and thus reduces the total amount of waste liquid in the decay pool in time, the amount of waste liquid entering the decay pool also increases greatly due to the sharp increase in the amount of radioactive waste liquid, and due to 131 The half-life of I is relatively long, and the amount discharged is less than the amount entering. Therefore, faced with the sharp increase in the amount of radioactive waste liquid, this measure cannot significantly reduce the amount of radioactive waste liquid in the nuclear medicine department of the decay pool. Therefore, how to significantly reduce the amount of radioactive waste liquid in the nuclear medicine department of the decay pool is an urgent problem to be solved. Summary of the invention

[0005] In view of this, the purpose of the present invention is to provide a method and system for treating radioactive liquid waste in nuclear medicine, so as to solve the problem that the existing method of timely discharging the waste liquid in the decay pool with qualified radionuclide concentration detection still cannot effectively reduce the amount of waste liquid in the decay pool when the amount of radioactive liquid waste is rapidly increasing.

[0006] To achieve the above-mentioned purpose, the present invention provides a method for treating radioactive waste liquid in nuclear medicine. Specifically, the method comprises the following steps:

[0007] 1) Discharge the waste liquid generated by the nuclear medicine department into the pre-storage container and conduct concentration detection on the waste liquid in the pre-storage container;

[0008] 2) When the concentration test result is lower than the specified limit value, the waste liquid in the pre-storage container is discharged into the medical waste water pipeline, otherwise the waste liquid in the pre-storage container is tested for nuclide type;

[0009] According to the correspondence between the nuclide type and the physical half-life, the physical half-life of the detected nuclide type is determined, and the range of the physical half-life of the detected nuclide type is determined according to the preset half-life range judgment standard, and the waste liquid of the nuclide type corresponding to different ranges is discharged into different decay pools;

[0010] The waste liquid in different decay pools is discharged after reaching the waste liquid storage time corresponding to the decay pool. The waste liquid storage time corresponding to the different decay pools is positively correlated with the range of the half-life of the nuclide type of the waste liquid in the decay pool.

[0011] The beneficial effects are as follows: the present invention takes into account the public equipment that can generate waste liquid, such as the restroom of the nuclear medicine department, which is not only used by patients of the nuclear medicine department, but also by family members of patients, staff and other people who do not contain radioactive nuclides in their bodies. Since the waste liquid is generated by the nuclear medicine department, it also flows into the decay pool, resulting in an increase in the amount of waste liquid in the decay pool. Secondly, patients in the nuclear medicine department use different types of nuclides, and the vast majority of patients in the nuclear medicine department are diagnostic patients (that is, patients using short half-life nuclides). 18 F. 99m Tc), and in the prior art, the waste liquid generated by most of these patients is mixed with the waste liquid generated by patients using long half-life nuclides and then flows into the decay pool together, and is discharged together after a set period of time. The set period is a period formulated according to the long half-life nuclides, so the period is too long, resulting in a continuous increase in the amount of waste liquid in the decay pool. Therefore, the method of the present invention first determines whether the waste liquid generated by the nuclear medicine department is generated by the patient before the waste liquid enters the decay pool. This part of the waste liquid does not contain radioactive nuclides and can be identified in time, so it does not need to be discharged into the decay pool, thereby occupying unnecessary decay pool space. That is, it is judged by concentration detection to directly introduce the waste liquid that passes the concentration test (that is, the waste liquid not generated by the patient) into the medical waste water pipeline to reduce the amount of waste liquid flowing into the decay pool from the source. Secondly, after determining that it is the waste liquid generated by the patient, further according to the nuclide type detection results, the nuclides with different half-lives are respectively drained and introduced into the corresponding decay pool, and then the storage time is set in combination with the corresponding decay pool, so that most of the waste liquid with a short physical half-life can be discharged in time after passing the test, thereby further reducing the amount of waste liquid in the decay pool. Therefore, the method of the present invention reduces the amount of waste liquid actually entering the decay pool from the source end, and discharges the waste liquid into different decay pools based on the type of nuclides to reduce the storage time of the waste liquid corresponding to the nuclides with short half-life in the decay pool, thereby improving the discharge efficiency of most of the waste liquid in the decay pool, thereby effectively reducing the amount of waste liquid in the decay pool when facing a sharp increase in the amount of radioactive waste liquid.

[0012] Based on the above, in step 2), the preset half-life range judgment standard is: when the physical half-life is less than the set number of days, the physical half-life is in the short half-life range, otherwise the physical half-life is in the long half-life range;

[0013] The waste liquid storage time corresponding to the decay pool into which the waste liquid of the nuclide types in the long half-life range is discharged is a first preset time, and the storage time corresponding to the decay pool into which the waste liquid of the nuclide types in the short half-life range is discharged is a second preset time, and the first preset time is greater than the second preset time.

[0014] The present invention takes into account the three main nuclides currently used in nuclear medicine. 18F, one day, that is, 24 hours, has exceeded 10 half-lives, meeting the national emission requirements of "more than 10 half-lives". 99m Tc, storage for 3 days also meets the emission requirements, so the nuclides with short half-life can meet the national emission requirements in a very short storage time, and this part of nuclides is also used by most patients. Therefore, the method of the present invention divides the nuclides with short half-life and long half-life by setting a set number of days, so that the two parts of nuclides are discharged into different decay pools respectively. On the one hand, it can shorten the storage time of the waste liquid of the nuclides with short half-life in the decay pool. On the other hand, the method based on the present invention is divided into two parts, compared with the situation of classification into three parts or more, not only the classification is simple, but also the number of decay pools used is reduced.

[0015] Based on the above, the concentration of the waste liquid in the decay pool that has not reached the waste liquid storage time corresponding to the decay pool is tested. If the concentration of the test result is lower than the specified limit value, the corresponding waste liquid in the decay pool is discharged.

[0016] After the waste liquid is discharged into the corresponding decay pool after classification, the waste liquid in the decay pool is not only discharged according to the storage time limit, but also based on the present invention, the waste liquid in the decay pool is tested between the time of discharge into the decay pool and the time of discharge, so as to further improve the discharge efficiency of the waste liquid in the decay pool.

[0017] Based on the above, the concentration and nuclide type of the waste liquid in the pre-storage container are detected by using a radiation monitoring detector.

[0018] The radiation monitoring detector used in the present invention can accurately detect the concentration of waste liquid and the type of nuclides.

[0019] To achieve the above-mentioned purpose, the present invention also provides a radioactive waste liquid treatment system for the nuclear medicine department, including a pre-storage container, the pre-storage container including a tank body, a water inlet, a first water outlet group and a second water outlet group, the water inlet is connected to the inlet of the waste liquid generated by the nuclear medicine department through a pipeline to discharge the waste liquid generated by the nuclear medicine department into the tank body, the various water outlets of the first water outlet group are connected to the medical waste water pipeline through a pipeline, the different water outlets of the second water outlet group are connected to pipelines connected to different decay pools through pipelines, valves are arranged at the various water outlets of the first water outlet group and the various water outlets of the second water outlet group, the tank body is also provided with a detection device for performing concentration detection and radionuclide type detection on the waste liquid in the tank body, and also includes a control system, the control system is communicatively connected to the detection device and the various valves, the control system is used to execute instructions to implement the steps of the radioactive waste liquid treatment method for the nuclear medicine department introduced above by obtaining the detection results of the detection device and controlling the switch state of each valve, and achieve the same beneficial effects as the method.

[0020] Based on the above, it also includes a toilet arranged in the nuclear medicine department's bathroom, and the inlet of the waste liquid generated by the nuclear medicine department is the outlet of the excretion channel of the toilet.

[0021] The present invention takes into account that the waste liquid generated by the nuclear medicine department mainly comes from the toilet in the nuclear medicine department's bathroom. Therefore, the system in the present invention also includes the toilet part of the nuclear medicine department's bathroom, making the system structure more complete. Based on the setting of the toilet, the present invention can set the pre-storage container and the toilet body as an integrated structure, so that the system structure of the present invention is compact and occupies little space, and the effect of the present invention can be achieved without damaging the floor of the nuclear medicine department.

[0022] Based on the above, the toilet is a vacuum toilet.

[0023] The present invention has reduced the amount of solution entering the decay tank by first performing a concentration detection process, and the vacuum toilet is a high-tech environmentally friendly technology that relies on vacuum negative pressure to collect toilet feces and urine. Its greatest technical features are: "extremely low water consumption, completely odorless, and extremely low energy consumption." The wastewater generated during each use is expected to be less than one-tenth of that of an ordinary toilet, thereby greatly reducing the amount of waste liquid entering the decay tank.

[0024] Based on the above, a sensor is provided on the vacuum toilet, and the sensor is used to sense whether the user has left;

[0025] The control system is communicatively connected to the vacuum pump, the water spray device and the sensor of the vacuum toilet, so as to control the vacuum pump of the vacuum toilet to suck the excrement into the pre-storage container after the user leaves, and start the water spray device to clean the vacuum toilet and suck the waste liquid generated by the cleaning into the pre-storage container.

[0026] In the present invention, a sensor is provided for the vacuum toilet, and the corresponding action of the vacuum toilet is controlled based on the sensing result of the sensor, so that after the patient uses the toilet, it can automatically inhale according to the vacuum negative pressure and spray a small amount of water for automatic flushing, thereby realizing intelligent flushing and avoiding the situation where waste liquid remains on the inner wall of the toilet due to the user forgetting to flush.

[0027] Based on the above, it also includes a radiation monitoring detector arranged on the vacuum toilet, which is used to measure the residual radioactive activity in the toilet in real time. The control device is communicatively connected to the radiation monitoring detector on the vacuum toilet so that when the residual radioactive activity in the toilet is measured to exceed a predetermined value, the water spraying device is started again to spray water to clean the vacuum toilet for the second time.

[0028] In the present invention, a radiation detector is arranged on the vacuum toilet. After the vacuum toilet is flushed once, the radiation detector measures the residual radioactive activity in the toilet in real time. If the residual radioactive activity value exceeds a predetermined value, it is automatically flushed again, thereby further ensuring the flushing effect of the vacuum toilet.

[0029] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present invention more obvious and easy to understand, the following specifically cites a preferred embodiment and describes it in detail with the accompanying drawings as follows. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 Flow chart of the method for treating radioactive liquid waste in nuclear medicine of the present invention.

[0031] Figure 2 Structural block diagram of the radioactive liquid waste treatment system of nuclear medicine of the present invention.

[0032] Figure 3 Schematic diagram of the logic of the radioactive liquid waste treatment system in the nuclear medicine department toilet of this embodiment. DETAILED DESCRIPTION

[0033] The technical scheme of the present invention will be clearly and completely described below in conjunction with specific embodiments, but those skilled in the art should understand that the embodiments described below are only used to illustrate the present invention and should not be regarded as limiting the scope of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] Example of radioactive liquid waste treatment system in nuclear medicine department

[0035] like Figure 2 As shown, the system of this embodiment includes a pre-storage container, which includes a tank body, a water inlet, a first water outlet group and a second water outlet group. The water inlet is connected to the inlet of the waste liquid generated by the nuclear medicine department through a pipeline to discharge the waste liquid generated by the nuclear medicine department into the tank body. The various water outlets of the first water outlet group are connected to the medical waste water pipeline through a pipeline, and the different water outlets of the second water outlet group are connected to pipelines connected to different decay pools through pipelines. Valves are set at each water outlet of the first water outlet group and each water outlet of the second water outlet group. A detection device for performing concentration detection and radionuclide type detection on the waste liquid in the tank body is also set in the tank body. The tank body also includes a control system, which is communicatively connected to the detection device and each valve. The control system is used to execute instructions to implement the steps of the radioactive waste liquid treatment method of the nuclear medicine department by obtaining the detection results of the detection device and controlling the switching state of each valve.

[0036] like Figure 1 As shown, the method steps of this embodiment include:

[0037] 1) Discharge the waste liquid generated by the nuclear medicine department into the pre-storage container and conduct concentration detection on the waste liquid in the pre-storage container;

[0038] 2) When the concentration test result is lower than the specified limit value, the waste liquid in the pre-storage container is discharged into the medical waste water pipeline, otherwise the waste liquid in the pre-storage container is tested for nuclide type;

[0039] According to the correspondence between the nuclide type and the physical half-life, the physical half-life of the detected nuclide type is determined, and the range of the physical half-life of the detected nuclide type is determined according to the preset half-life range judgment standard, and the waste liquid of the nuclide type corresponding to different ranges is discharged into different decay pools;

[0040] The waste liquid in different decay pools is discharged after reaching the waste liquid storage time corresponding to the decay pool. The waste liquid storage time corresponding to the different decay pools is positively correlated with the range of the half-life of the nuclide type of the waste liquid in the decay pool.

[0041] This embodiment reduces the amount of waste liquid actually entering the decay pool from the source end, and discharges the waste liquid into different decay pools based on the type of nuclides to reduce the storage time of the waste liquid corresponding to the nuclides with short half-life in the decay pool, thereby improving the discharge efficiency of most of the waste liquid in the decay pool, and thus effectively reducing the amount of waste liquid in the decay pool when facing a sharp increase in the amount of radioactive waste liquid. In this embodiment, a radiation monitoring detector is used to accurately detect the concentration of waste liquid and the type of nuclides. And the limit value of this embodiment is consistent with the radioactive waste liquid discharge standard stipulated in "Nuclear Medicine Radiation Protection and Safety Requirements HJ 1188-2021".

[0042] In addition, this embodiment takes into account that currently nuclear medicine mainly uses three types of nuclides as shown in Table 1 below. These three nuclides have different half-lives. 18 F is the shortest (110 minutes), 131 I is the longest (8.04 days). 18 F, one day, that is, 24 hours, has exceeded 10 half-lives, meeting the national emission requirements of "more than 10 half-lives"; 99m Tc, storage for 3 days also meets the emission requirements. 131 I has a longer half-life of 8.04 days. According to direct storage, the natural decay is not less than 10 half-lives, and taking into account 131The β decay of I may cause internal irradiation and greater toxicity. The relevant national standards and regulations require that it must be stored for more than 180 days before it can be discharged. However, since the waste liquids of the above three types of nuclides cannot be distinguished from the source in time, they are all directly discharged into the decay pool. In addition, most patients in most nuclear medicine departments are diagnostic patients (that is, patients using short half-life nuclides). 18 F. 99m Tc), these patients using short half-life radionuclides have excreted a small number of patients using long half-life ( 131 I) The excrement of patients undergoing radionuclide treatment is mixed and discharged into the decay pool, which is an important reason why the decay pools in nuclear medicine are getting bigger and bigger.

[0043] Table 1

[0044] Nuclide name Physical half-life Decay type <![CDATA[ 131 I]]> 8.04d β- <![CDATA[ 99m Tc]]> 6.02h β- <![CDATA[ 18 F]]> 110min β+

[0045] Therefore, nuclides with short half-lives can meet national emission requirements within a very short storage time, and these nuclides are also used by most patients. Therefore, in step 2) of this embodiment, the preset half-life range judgment standard is: when the physical half-life is less than the set number of days, the physical half-life is in the short half-life range, otherwise the physical half-life is in the long half-life range;

[0046] The waste liquid storage time corresponding to the decay pool into which the waste liquid of the nuclide types in the long half-life range is discharged is the first preset time, and the storage time corresponding to the decay pool into which the waste liquid of the nuclide types in the short half-life range is discharged is the second preset time, and the first preset time is greater than the second preset time.

[0047] Based on setting a set number of days to divide the nuclides into short half-life and long half-life, so that the two parts of nuclides are discharged into different decay pools respectively, on the one hand, it can shorten the storage time of the waste liquid of the nuclides with short half-life in the decay pool, and on the other hand, based on the method of dividing into two parts according to the present invention, compared with the situation of classification into three parts or more, not only the classification is simplified, but also the number of decay pools used is reduced.

[0048] In order to further improve the discharge efficiency of the waste liquid in the decay pool, the present embodiment also performs concentration detection on the waste liquid in the decay pool that has not reached the waste liquid storage time corresponding to the decay pool. If the concentration of the detection result is lower than the specified limit value, the corresponding waste liquid in the decay pool is discharged. After being classified and discharged into the corresponding decay pool, the waste liquid in the decay pool is not only discharged according to the storage time limit, but also based on the present invention, the waste liquid in the decay pool is detected between the discharge into the decay pool and the reaching of the discharge time, so as to further improve the discharge efficiency of the waste liquid in the decay pool, and significantly reduce the amount of waste liquid in the decay pool.

[0049] The system of this embodiment can be applied to public facilities that can generate waste liquid, such as toilets or shower rooms in nuclear medicine departments.

[0050] When the device of this embodiment is applied to a shower room, the system of this embodiment can be added at the water outlet of the shower room (for example, the shower floor drain), so that the wastewater generated in the shower room first flows into the pre-storage container of the system of this embodiment, and the radioactivity concentration of the wastewater in the pre-storage container is measured in real time. Wastewater that meets national standards (i.e., the result of concentration detection is lower than the prescribed limit value) can be directly discharged into the hospital sewage system, while wastewater with a radioactivity concentration higher than the national prescribed value can be drained into the corresponding decay pool according to the type of nuclide with different half-lives.

[0051] When the system of this embodiment is applied to the bathroom of the nuclear medicine department, the inlet of the waste liquid generated by the nuclear medicine department is the outlet of the excretion channel of the toilet. By adding the system of this embodiment to the outlet of the excretion channel of the toilet, the waste water generated by the toilet first flows into the pre-storage container of the system of this embodiment, and the radioactive activity concentration of the waste water in the pre-storage container is measured in real time. Waste water that meets national standards (that is, the result of concentration detection is lower than the prescribed limit value) can be directly discharged into the hospital sewage system, and waste water with a radioactive activity concentration higher than the national prescribed value can be drained into the corresponding decay pool according to the type of nuclide.

[0052] When applied to the bathroom of the nuclear medicine department, the system of this embodiment also includes the toilet part of the bathroom of the nuclear medicine department, making the system structure more complete, and based on the setting of the toilet, the system of this embodiment can set the pre-storage container and the toilet body as an integrated structure, so that the system of this embodiment has a compact structure and occupies little space, and the effect of the system of this embodiment can be achieved without damaging the floor of the nuclear medicine department.

[0053] like Figure 3 As shown, the toilet used in this embodiment is a vacuum toilet, and a sensor is provided on the vacuum toilet for sensing whether the user has left. The control system is communicatively connected to the vacuum pump, the water spray device and the sensor of the vacuum toilet, so as to control the vacuum pump of the vacuum toilet to suck the excrement into the pre-storage container after the user has left, and start the water spray device to clean the vacuum toilet and suck the waste liquid generated by the cleaning into the pre-storage container. The vacuum toilet is also provided with a radiation monitoring detector for measuring the residual radioactive activity in the toilet in real time. The control device is also communicatively connected to the radiation monitoring detector on the vacuum toilet, so as to start the water spray device again to spray and clean the vacuum toilet for the second time when the residual radioactive activity in the toilet is measured to exceed a predetermined value (the predetermined value is adjustable).

[0054] Based on the setting of the vacuum toilet part of this embodiment, firstly, the waste water generated during each use is expected to be less than one tenth of that of the previous ordinary toilet, thereby greatly reducing the amount of waste liquid entering the decay pool; secondly, by setting the vacuum toilet with a sensor and a radiation monitoring detector, after the patient goes to the toilet, it can automatically inhale according to the vacuum negative pressure and spray a small amount of water for automatic flushing, realizing intelligent flushing, avoiding the situation where the user forgets to flush and the waste liquid remains on the inner wall of the toilet, and through the radiation detector, after the vacuum toilet is flushed once, the residual radioactive activity in the toilet is measured in real time. If the residual radioactive activity value exceeds the preset value, it will be automatically flushed again, further ensuring the flushing effect of the vacuum toilet.

[0055] Taking the three main nuclides currently used in nuclear medicine as an example, the system of this embodiment can achieve the following process when applied to the bathroom of nuclear medicine: the sensor senses that someone uses the toilet and then leaves, notifies the vacuum pump to start sucking excrement; starts water spraying for cleaning and pumps it away; decides whether to spray water for cleaning a second time based on the real-time measurement results of the radiation detector; automatically measures the concentration of the waste liquid in the container (i.e., the pre-storage container) and performs nuclide analysis; confirms whether it is lower than the limit value, and if it is lower than the limit value, it is directly discharged into the medical waste water pipeline; if it is higher than the limit value, it is determined what nuclide it is, and if it is a long half-life ( 131 I) is discharged into the decay pool where the long half-life nuclide waste liquid is stored. If it is a short half-life ( 99m Tc or 18 F), it is discharged into the decay pool for storing short half-life nuclide waste liquid; when the storage time of the waste liquid in the decay pool reaches the standard discharge time, it is discharged.

[0056] In this embodiment, waste liquid without radionuclides (activity below the limit value) is not introduced into the decay pool, and the amount of flushing water is greatly reduced by using a vacuum water-saving toilet, so as to reduce the amount of radioactive waste liquid entering the decay pool from the source; through real-time radiation monitoring, the amount of radioactive waste liquid entering the decay pool is reduced from the source while ensuring that it is flushed clean; before the patient excretes and the vacuum toilet starts to extract waste liquid, real-time nuclide identification is used to distinguish long half-life ( 133 I) and short half-life ( 99m Tc or 18 F), respectively discharged into different decay pools, so as to reduce the storage time of most of the waste liquid of short half-life nuclides according to the classified storage, and further reduce the amount of waste liquid in the decay pool. Furthermore, in the case of a sharp increase in the amount of radioactive waste liquid, there is no need to expand the volume of the decay pool too much, that is, this embodiment can further reduce the volume of the decay pool.

[0057] Example of a method for treating radioactive liquid waste in nuclear medicine

[0058] The method of this implementation includes the following steps:

[0059] 1) Discharge the waste liquid generated by the nuclear medicine department into the pre-storage container and conduct concentration detection on the waste liquid in the pre-storage container;

[0060] 2) When the concentration test result is lower than the specified limit value, the waste liquid in the pre-storage container is discharged into the medical waste water pipeline, otherwise the waste liquid in the pre-storage container is tested for nuclide type;

[0061] According to the correspondence between the nuclide type and the physical half-life, the physical half-life of the detected nuclide type is determined, and the range of the physical half-life of the detected nuclide type is determined according to the preset half-life range judgment standard, and the waste liquid of the nuclide type corresponding to different ranges is discharged into different decay pools;

[0062] The waste liquid in different decay pools is discharged after reaching the waste liquid storage time corresponding to the decay pool. The waste liquid storage time corresponding to the different decay pools is positively correlated with the range of the half-life of the nuclide type of the waste liquid in the decay pool.

[0063] The method steps of this embodiment can be implemented by a radioactive liquid waste treatment system. The specific radioactive liquid waste treatment system for implementing the radioactive liquid waste treatment method steps of this embodiment has been introduced in detail in the embodiment of the radioactive liquid waste treatment system in the nuclear medicine department, and will not be repeated here.

[0064] Although the present invention has been described in detail above by general description and specific embodiments, it is obvious to those skilled in the art that some modifications or improvements can be made to the present invention. Therefore, these modifications or improvements made without departing from the spirit of the present invention all belong to the scope of protection claimed by the present invention.

Claims

1. A method for treating radioactive liquid waste in nuclear medicine, characterized in that: The steps include: 1) Discharge the waste liquid generated by the nuclear medicine department into the pre-storage container and conduct concentration detection on the waste liquid in the pre-storage container; 2) When the concentration test result is lower than the specified limit value, the waste liquid in the pre-storage container is discharged into the medical waste water pipeline, otherwise the waste liquid in the pre-storage container is tested for nuclide type; According to the correspondence between the nuclide type and the physical half-life, the physical half-life of the detected nuclide type is determined, and the range of the physical half-life of the detected nuclide type is determined according to the preset half-life range judgment standard, and the waste liquid of the nuclide type corresponding to different ranges is discharged into different decay pools; The waste liquid in different decay pools is discharged after reaching the waste liquid storage time corresponding to the decay pool. The waste liquid storage time corresponding to the different decay pools is positively correlated with the range of the half-life of the nuclide type of the waste liquid in the decay pool.

2. The method for treating radioactive liquid waste in nuclear medicine according to claim 1, characterized in that: In step 2), the preset half-life range is determined by: when the physical half-life is less than the set number of days, the physical half-life is in the short half-life range, otherwise the physical half-life is in the long half-life range; The waste liquid storage time corresponding to the decay pool into which the waste liquid of the nuclide types in the long half-life range is discharged is a first preset time, and the storage time corresponding to the decay pool into which the waste liquid of the nuclide types in the short half-life range is discharged is a second preset time, and the first preset time is greater than the second preset time.

3. The method for treating radioactive liquid waste in nuclear medicine according to claim 1, characterized in that: The concentration of the waste liquid in the decay pool that has not reached the waste liquid storage time corresponding to the decay pool is tested. If the concentration of the test result is lower than the specified limit value, the corresponding waste liquid in the decay pool is discharged.

4. The method for treating radioactive liquid waste in nuclear medicine according to claim 1, characterized in that: The concentration and nuclide type of the waste liquid in the pre-storage container are detected by radiation monitoring detectors.

5. A radioactive waste liquid treatment system for nuclear medicine, characterized in that: The invention comprises a pre-storage container, which comprises a tank body, a water inlet, a first water outlet group and a second water outlet group. The water inlet is connected to an inlet of waste liquid generated by the nuclear medicine department through a pipeline to discharge the waste liquid generated by the nuclear medicine department into the tank body. The water outlets of the first water outlet group are connected to a medical waste water pipeline through a pipeline. The different water outlets of the second water outlet group are connected to pipelines connected to different decay pools through pipelines. Valves are arranged at the water outlets of the first water outlet group and the water outlets of the second water outlet group. A detection device for performing concentration detection and radionuclide type detection on the waste liquid in the tank body is also arranged in the tank body. The invention also comprises a control system, which is communicatively connected to the detection device and the valves. The control system is used to execute instructions to realize the steps of the method for treating radioactive waste liquid in the nuclear medicine department as described in any one of claims 1 to 4 by obtaining the detection results of the detection device and controlling the switch status of the valves.

6. The radioactive liquid waste treatment system for nuclear medicine according to claim 5, characterized in that: It also includes a toilet arranged in the nuclear medicine department bathroom, and the inlet of the waste liquid generated by the nuclear medicine department is the outlet of the excretion channel of the toilet.

7. The radioactive liquid waste treatment system for nuclear medicine according to claim 6, characterized in that: The toilet is a vacuum toilet.

8. The radioactive liquid waste treatment system for nuclear medicine according to claim 7, characterized in that: The vacuum toilet is provided with a sensor, and the sensor is used to sense whether the user has left; The control system is communicatively connected to the vacuum pump, the water spray device and the sensor of the vacuum toilet, so as to control the vacuum pump of the vacuum toilet to suck the excrement into the pre-storage container after the user leaves, and start the water spray device to clean the vacuum toilet and suck the waste liquid generated by the cleaning into the pre-storage container.

9. The radioactive liquid waste treatment system for nuclear medicine according to claim 8, characterized in that: It also includes a radiation monitoring detector arranged on the vacuum toilet, which is used to measure the residual radioactive activity in the toilet in real time. The control device is communicatively connected to the radiation monitoring detector on the vacuum toilet so that when the residual radioactive activity in the toilet is measured to exceed a predetermined value, the water spraying device is started again to spray water to clean the vacuum toilet for the second time.

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