Nuclear medicine decay pool waste liquid discharge detection system

Abstract

The invention belongs to the technical field of medical equipment application, and particularly relates to a nuclear medicine decay pool waste liquid discharge detection system. Comprising a decay tank and an activity detector, a sampling mechanism is arranged in the decay tank and comprises a sampling pipe horizontally arranged in the decay tank and a communicating pipe arranged close to the middle of the sampling pipe, the communicating pipe is perpendicular to the sampling pipe, and a sampling pipe is arranged at the end, away from the sampling pipe, of the communicating pipe; according to the radioactive waste liquid sampling device, the sampling mechanism is arranged to be matched with slow entering of the radioactive waste liquid, so that the sampling pipe contains certain air, a probe does not make contact with the radioactive waste liquid in the non-sampling period, and the air in the sampling pipe is extracted through an air pump in the sampling period; the radioactive waste liquid is in contact with the probe under the action of water pressure, so that the detection requirement is met.

Description

Technical Field

[0001] The invention belongs to the technical field of medical equipment application, and in particular relates to a nuclear medicine decay pool waste liquid outlet detection system. Background Art

[0002] Radioactive waste liquids in the field of nuclear medicine are mainly excrement (including vomitus) of patients and examinees, residual liquid of radioactive drugs (reagents), radioactive utensils and washing liquid of radioactive staff, etc. These waste liquids will be discharged into the hospital's sewer system with sewage, and then discharged outside the hospital to pollute the environment. Especially for patients with thyroid diseases, the concentration of 131I in the sewage at the hospital's total discharge port may exceed the limit of national standards on the 2nd to 10th day after taking medication. Therefore, the management of radioactive wastewater in nuclear medicine units cannot be ignored.

[0003] According to relevant national regulations, radioactive waste liquids generated by nuclear medicine diagnosis and treatment and radioactive excrement of patients should be collected separately. At the same time, all Class I workplaces and nuclear medicine units that carry out radiopharmaceutical treatment should be equipped with radioactive wastewater pools (i.e. radioactive decay pools, hereinafter referred to as decay pools) to store radioactive wastewater until it meets the discharge requirements. In order to leave a certain safety space for the development of nuclear medicine in hospitals and changes in emission standards, all nuclear medicine diagnosis and treatment units can set up decay pools if conditions permit.

[0004] In order to ensure the pollution-free discharge of radioactive waste liquid, the radioactive waste liquid can only be discharged after passing the inspection in the decay pool. The existing inspection for the decay pool is activity detection, which uses the activity detector to effectively measure the attenuation degree of the radioactive waste liquid in the decay pool, thereby determining whether it meets the discharge standards.

[0005] In order to avoid harm to staff, the existing activity detection has also been changed from traditional sampling detection to automatic detection. The probe of the activity detector is placed in the decay pool for relevant detection. Although the above detection achieves the purpose of detection to a certain extent, the probe is retained in the decay pool for a long time, which makes it easy for other substances to adhere to the surface of the probe, thereby affecting the accuracy of the detection. Summary of the invention

[0006] In view of the problems existing in decay pool detection, the present invention proposes a nuclear medicine decay pool waste liquid outlet detection system which has reasonable design, simple structure, convenient processing and can avoid the problem of adhesion of detection probes.

[0007] In order to achieve the above-mentioned purpose, the technical solution adopted by the present invention is as follows: the present invention provides a nuclear medicine decay pool waste liquid outlet detection system, including a decay pool and an activity detector, a sampling mechanism is arranged in the decay pool, the sampling mechanism includes a sampling tube horizontally arranged in the decay pool and a connecting tube arranged near the middle of the sampling tube, the connecting tube is arranged vertically with the sampling tube, a sampling tube is arranged at one end of the connecting tube away from the sampling tube, the sampling tube is inclined relative to the connecting tube, one end of the sampling tube close to the sampling tube and one end of the sampling tube away from the connecting tube are both closed, a suction tube is arranged at one end of the sampling tube away from the connecting tube, the suction tube extends out of the decay pool, and the end of the suction tube away from the sampling tube is connected to an air pump, the activity detector is arranged outside the decay pool, and the probe of the activity detector extends into the sampling tube.

[0008] Preferably, the probe of the activity detector is arranged close to the connecting pipe.

[0009] Preferably, the sampling mechanisms are arranged on the decay cell at intervals up and down.

[0010] Preferably, the sampling tubes of the sampling mechanism are arranged in different lengths in the decay cell.

[0011] Preferably, a protective tube is mounted outside the probe of the activity detector, and the protective tube is arranged between the sampling tube and the decay cell.

[0012] Compared with the prior art, the advantages and positive effects of the present invention are:

[0013] 1. The present invention provides a nuclear medicine decay pool waste liquid outlet detection system, which utilizes the setting of a sampling mechanism to cooperate with the slow entry of radioactive waste liquid to allow a certain amount of air to be contained in the sampling tube, thereby preventing the probe from contacting the radioactive waste liquid during non-sampling. During sampling, an air pump is used to extract the air in the sampling tube, so that the radioactive waste liquid is in contact with the probe under the action of water pressure, thereby meeting the detection requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0015] Figure 1 A schematic diagram of the structure of a nuclear medicine decay pool waste liquid outlet detection system provided in Example 1;

[0016] In the above figures, 1. decay cell; 2. activity detector probe; 3. sampling mechanism; 31. sampling tube; 32. connecting tube; 33. sampling tube; 34. suction tube; 35. protection tube; 4. air pump. DETAILED DESCRIPTION

[0017] In order to more clearly understand the above-mentioned purpose, features and advantages of the present invention, the present invention is further described below in conjunction with the accompanying drawings and embodiments. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0018] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways than those described herein. Therefore, the present invention is not limited to the specific embodiments of the following disclosure.

[0019] Embodiment 1, as Figure 1 As shown, the present embodiment aims to provide a nuclear medicine decay pool 1 waste liquid outlet detection system that can effectively protect the activity detector probe 2. To this end, the nuclear medicine decay pool 1 waste liquid outlet detection system provided in the present embodiment includes a decay pool 1 and an activity detector. In the present embodiment, the decay pool 1 is an intermittent decay pool 1, and its working principle is: after a decay pool 1 is filled with wastewater, it is closed, and the next decay pool 1 is activated. When the last decay pool 1 is activated, the wastewater in the first decay pool 1 has reached the discharge standard. After the last decay pool 1 is filled with wastewater, the first decay pool 1 is put into use. After this type of decay pool 1 is filled, the wastewater no longer moves, which is convenient for subsequent detection. The activity detector can be an existing commonly used activity detector.

[0020] Considering that the detection methods of the existing activity detector are mainly divided into two types: manual sampling and online sampling, there are safety issues in manual sampling, but the activity detector is not affected. There is no safety problem in online sampling, but its probe will be immersed for a long time to affect the detection accuracy. Therefore, if the two are effectively combined, the purpose of complementarity can be achieved, thereby achieving the purpose of safety without affecting the detection accuracy. Therefore, in order to achieve the above purpose, a sampling mechanism 3 is arranged in the decay pool 1, and the sampling mechanism 3 includes a sampling tube 31 horizontally arranged in the decay pool 1 and a connecting tube 32 vertically arranged on the sampling tube 31. The connecting tube 32 is connected to the sampling tube 31, and a sampling tube 33 is arranged at one end of the connecting tube 32 away from the sampling tube 31. The sampling tube 33 is inclined relative to the connecting pipe 32, and the end of the sampling tube 31 close to the sampling tube 33 and the end of the sampling tube 33 away from the connecting pipe 32 are both closed. Since the waste liquid in the decay pool 1 rises slowly and the sampling tube 31 is horizontally arranged, as the height of the radioactive waste liquid continues to increase, the air in the sampling tube 31 will be continuously discharged, so that the radioactive waste liquid fills the sampling tube 31. Since the connecting pipe 32 is vertically arranged and the end of the sampling tube 33 is sealed, the air therein will not be discharged, but will only be continuously squeezed under the pressure of the radioactive waste liquid. In this way, the radioactive waste liquid will fill part or all of the connecting pipe 32, but will not fill the sampling tube 33, so that the sampling tube 33 is filled with a certain amount of compressed air.

[0021] At the same time, a suction pipe 34 is provided at one end of the sampling tube 33 away from the connecting pipe 32. The suction pipe 34 extends out of the decay pool 1, and the end of the suction pipe 34 away from the sampling tube 33 is connected to the air pump 4. In this way, when the air pump 4 extracts a certain amount of air from the sampling tube 33, the pressure of the air in the sampling tube 33 is less than the pressure of the radioactive waste liquid, and the radioactive waste liquid will continue to fill the sampling tube 33. At this time, the activity detector is arranged outside the decay pool 1, and the probe of the activity detector extends into the sampling tube 33. In this way, more and more radioactive waste liquid enters the sampling tube 33, thereby contacting the probe to complete the detection. Since the sampling tube 31 is connected to the decay pool 1, the liquids therein will flow, so the detection result is also the result in the decay pool 1. After the detection is completed, if the discharge requirement is not met, the air pump 4 pumps air into the sampling tube 33 to increase the pressure in the sampling tube 33, thereby discharging the radioactive waste liquid. The inclined arrangement of the sampling tube 33 facilitates the compression of air and the flow of liquid.

[0022] In this way, the probe is not immersed in the radioactive waste liquid for a long time, and the sampling process only needs to use the air pump 4 to pump air, and the directly discharged air will not pose a safety hazard. Similarly, the amount of air pumped in and the amount of air discharged are consistent, and there will be no impact on the decay pool 1.

[0023] Taking into account the content of the waste liquid in the existing decay pool 1 and the magnitude of the pressure generated, in this embodiment, the probe of the activity detector is arranged close to the connecting pipe 32.

[0024] In order to ensure the accuracy of sampling, in this embodiment, the sampling mechanism 3 is arranged at intervals on the decay pool 1. At the same time, the sampling tubes 31 of the sampling mechanism 3 are arranged in different lengths in the decay pool 1. In this way, the accuracy of detection is ensured through multi-point sampling.

[0025] Considering the inclined setting of the sampling tube 33, a part of the probe may be exposed to the outside, for this reason, a protective tube 35 is also set outside the probe of the activity detector, and the protective tube 35 is arranged between the sampling tube 33 and the decay cell 1. In this way, through the protection of the protective tube 35, the probe is fully protected.

[0026] The above description is only a preferred embodiment of the present invention and does not limit the present invention in other forms. Any technician familiar with the profession may use the technical content disclosed above to change or modify it into an equivalent embodiment with equivalent changes and apply it to other fields. However, any simple modification, equivalent change and modification made to the above embodiment based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still falls within the protection scope of the technical solution of the present invention.

Claims

1. A nuclear medicine decay pool waste liquid effluent detection system, comprising a decay pool and an activity detector, characterized in that: A sampling mechanism is arranged in the decay pool, and the sampling mechanism includes a sampling tube horizontally arranged in the decay pool and a connecting tube arranged near the middle of the sampling tube, the connecting tube is arranged vertically to the sampling tube, a sampling tube is arranged at one end of the connecting tube away from the sampling tube, the sampling tube is inclined relative to the connecting tube, one end of the sampling tube close to the sampling tube and one end of the sampling tube away from the connecting tube are both closed, a suction tube is arranged at one end of the sampling tube away from the connecting tube, the suction tube extends out of the decay pool, and one end of the suction tube away from the sampling tube is connected to an air pump, the activity detector is arranged outside the decay pool, and a probe of the activity detector extends into the sampling tube.

2. The nuclear medicine decay pool waste liquid outlet detection system according to claim 1, characterized in that: The probe of the activity detector is arranged close to the connecting pipe.

3. The nuclear medicine decay pool waste liquid outlet detection system according to claim 2, characterized in that: The sampling mechanism is arranged on the decay pool at intervals up and down.

4. The nuclear medicine decay pool waste liquid outlet detection system according to claim 3, characterized in that: The sampling tubes of the sampling mechanism are arranged in different lengths in the decay pool.

5. The nuclear medicine decay pool waste liquid outlet detection system according to claim 4, characterized in that: The probe of the activity detector is also covered with a protection tube, and the protection tube is arranged between the sampling tube and the decay cell.

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