Positron annihilation lifetime measurement system

Abstract

The application relates to a positron annihilation lifetime measurement system, which comprises a box assembly, a radioactive source, an operation platform and a detector arranged in the operation box. The radioactive source is arranged on the operation platform and is used for emitting positrons to a sample to be measured. The detector is arranged for measuring the positron annihilation lifetime. A shielding layer is arranged on the outer surface of the box assembly and shields the radiation generated by the radioactive source. A first taking and placing opening is arranged on the shielding layer and is communicated with the inner cavity of the operation box. The shielding layer is provided with a first shielding door which is hinged to the shielding layer. The first shielding door can rotate around the hinge point of the first shielding door and the shielding layer to close and open the first taking and placing opening. In the embodiment, the shielding layer is arranged on the outer surface of the box assembly to isolate the box assembly from the external environment, so that the body of an external worker can be prevented from being radiated by a radioactive sample, and safe measurement of the radioactive sample is realized.

Description

Technical Field

[0001] This application relates to the field of nuclear detection technology, and in particular to a positron annihilation lifetime measurement system. Background Technology

[0002] Positron annihilation is a non-destructive and sensitive probe for atomic-level defects in materials, offering unique advantages in studying the distribution and evolution of material defects. A positron annihilation lifetime measurement system is a non-destructive research method that utilizes the lifetime of annihilation radiation of positrons in condensed matter to study the internal microstructure, electron momentum distribution, and defect states of the material. It can be used to study the degree of damage to nuclear materials under different irradiation temperatures and doses, and to characterize and analyze the types and concentrations of micro-defects introduced by irradiation. However, in related technologies, positron annihilation lifetime measurement systems are used to measure positron annihilation in radioactive samples. During this process, workers are easily exposed to radiation from the radioactive samples, potentially causing injury. Therefore, it is difficult to safely measure radioactive samples using positron annihilation lifetime measurement systems. Summary of the Invention

[0003] Therefore, it is necessary to provide a positron annihilation lifetime measurement system to address the problem that current positron annihilation lifetime measurement systems cannot safely measure radioactive samples.

[0004] A positron annihilation lifetime measurement system, comprising:

[0005] The housing assembly includes an operating box, which contains a radiation source, an operating platform, and a detector. The radiation source is disposed on the operating platform and is used to emit positrons to the sample to be tested. The detector is disposed on the operating platform and is used to measure the annihilation lifetime of the positrons.

[0006] A shielding layer covers the outer surface of the housing assembly to shield the radiation generated by the radiation source. The shielding layer has a first access port that communicates with the inner cavity of the operating box. A first shielding door is provided at the location where the first access port is located on the shielding layer. The first shielding door is hinged to the shielding layer and can rotate around the hinge point between itself and the shielding layer to close and open the first access port.

[0007] In one embodiment, the housing assembly includes a transition box and a connecting channel. The transition box is spaced apart on one side of the operating box, and the connecting channel is disposed between the operating box and the transition box. The inner cavity of the operating box and the inner cavity of the transition box are connected through the connecting channel.

[0008] The transition box is equipped with a connecting door, which is hinged to the cavity wall of the transition box and can rotate around the hinge point between itself and the transition box to open or close the connecting channel.

[0009] The shielding layer is provided with a second access port, which is connected to the inner cavity of the transition box. A second shielding door is provided at the location of the second access port on the shielding layer. The second shielding door is hinged to the shielding layer and can rotate around the hinge point between itself and the shielding layer to close and open the second access port.

[0010] In one embodiment, a first operating channel is provided on one side of the shielding layer;

[0011] The first operation channel includes a plurality of first operation ports. Along the arrangement direction of the operation box and the transition box, the plurality of first operation ports are arranged at intervals, and each first operation port is connected to the inner cavity of the transition box.

[0012] Each of the shielding layers is hinged with a first operating door at each of the first operating ports. Each first operating door can rotate around its hinge point with the shielding layer to open and close the corresponding first operating port.

[0013] In one embodiment, the shielding layer is provided with a second operation channel, and the second operation channel and the first operation channel are spaced apart along the arrangement direction of the operation box and the transition box;

[0014] The second operation channel includes a plurality of second operation ports, which are spaced apart along the arrangement direction of the operation box and the transition box, and each second operation port communicates with the inner cavity of the operation box;

[0015] A second operating door is hinged to each of the second operating ports on the shielding layer. Each second operating door can rotate around its hinge point with the shielding layer to open and close the corresponding second operating port.

[0016] In one embodiment, the positron annihilation lifetime measurement system includes an operating glove, with the operating glove worn inside each of the first operating ports and each of the second operating ports;

[0017] The inner wall of each first operating port is sealed to the outer surface of the corresponding operating glove, and the inner wall of each second operating port is sealed to the outer surface of the corresponding operating glove.

[0018] In one embodiment, the outer surface of the operating glove is covered with a shielding layer.

[0019] In one embodiment, a plurality of first viewing ports are provided on one side of the housing assembly, and the plurality of first viewing ports are spaced apart along the arrangement direction of the operating box and the transition box;

[0020] Of the plurality of first viewing ports, a portion of the first viewing ports are connected to the inner cavity of the transition box, and another portion of the first viewing ports are connected to the inner cavity of the operation box. Each first viewing port is provided with a first viewing window.

[0021] The shielding layer is provided with a plurality of second viewing ports, which are configured one-to-one with a plurality of first viewing ports. Each second viewing port is connected to a corresponding first viewing port, and each second viewing port is embedded with a second viewing window.

[0022] In one embodiment, the detector includes a start gamma detector, a first stop gamma detector, and a second stop gamma detector;

[0023] The initial gamma detector is disposed on one side of the operating platform along the first direction, and the initial gamma detector is used to detect the gamma rays generated by the cascade when the radiation source emits positrons;

[0024] The first and second stopping gamma detectors are respectively arranged on both sides of the operating platform along the second direction. The gravity direction of the operating box, the first direction and the second direction are perpendicular to each other. The first and second stopping gamma detectors are used to detect the two annihilation gamma rays emitted in opposite directions after the annihilation of positrons.

[0025] In one embodiment, the positron annihilation lifetime measurement system includes a first intake and exhaust assembly, which includes a first intake channel and a first exhaust channel;

[0026] One end of the first air intake channel is connected to the inner cavity of the control box, one end of the first exhaust channel is connected to the inner cavity of the control box, and the other end of the first exhaust channel is connected to a first exhaust filter.

[0027] In one embodiment, the positron annihilation lifetime measurement system includes an isolation plate embedded in a wall, the isolation plate having an opening that penetrates the isolation plate along the first direction;

[0028] The shielding layer passes through the opening, and the shielding layer has a first pick-and-place port on one side along the first direction. The isolation plate is flush with the shielding layer on the side away from the first pick-and-place port along the first direction.

[0029] The positron annihilation lifetime measurement system in this embodiment includes a radiation source, an operating platform, and a detector within the operating box. The radiation source is positioned on the operating platform, where the operator places the sample to be tested. The detector detects the positron annihilation lifetime emitted by the radiation source towards the sample, allowing the operator to determine the type of defects present in the sample. By covering the outer surface of the box assembly with a shielding layer, the positron annihilation lifetime measurement system can isolate the box assembly from the external environment when detecting radioactive samples. This prevents radiation generated by the sample inside the operating box from spreading to the outside, avoiding radiation exposure to external personnel and ultimately achieving safe measurement of radioactive samples. In summary, this embodiment, by covering the outer surface of the box assembly with a shielding layer, isolates the box assembly from the external environment, preventing external personnel from being exposed to radiation from the sample and achieving safe measurement of radioactive samples. Attached Figure Description

[0030] To more clearly illustrate the technical solutions in the embodiments or exemplary embodiments of this application, the drawings used in the description of the embodiments or exemplary embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0031] Figure 1 This is a horizontal cross-sectional view of a positron annihilation lifetime measurement system according to an embodiment of this application.

[0032] Figure 2 for Figure 1 The positron annihilation lifetime measurement system shown is a cross-sectional view at point A.

[0033] Figure 3 for Figure 2 The diagram shows a magnified view of the positron annihilation lifetime measurement system at point A.

[0034] Figure 4 for Figure 1 The diagram shows the main view of the positron annihilation lifetime measurement system.

[0035] Figure 5 for Figure 4 The diagram shows the structure of the positron annihilation lifetime measurement system without the first shielding component.

[0036] Figure 6 for Figure 5 The diagram shows a top view of the positron annihilation lifetime measurement system.

[0037] Figure label:

[0038] Positron annihilation lifetime measurement system 1000;

[0039] Box assembly 1100, operation box 1110, radiation source 1111, operation platform 1112, detector 1113, initial gamma detector 1113-1, first stop gamma detector 1113-2, second stop gamma detector 1113-3, transition box 1120, connecting door 1121, connecting door body 1121-1, first hinge 1121-2, first protrusion 1121-3, connecting channel 1130, first viewing port 1140, first viewing window 1150, first viewing glass plate 1151, first mounting flange 1152, first pressure cover 1153, first baffle 1153-1, first pressure plate 1153-2, first fastener 1153-3;

[0040] Shielding layer 1200, shielding cover 1210, wiring hole 1211, shielding sleeve 1212, shielding side plate 1220, first shielding component 1221, first shielding part 1221-1, first operating channel 1221-2, first operating port 1221-2-1, first operating door 1221-3, second operating channel 1221-4, second operating port 1221-4-1, second operating door 1221-5, operating gloves 1221-6, second shielding Part 1221-7, Second viewing port 1221-7-1, Second shielding component 1222, Third shielding part 1222-1, First access port 1222-1-1, First shielding door 1222-1-2, Second hinge 1222-1-3, First locking block 1222-1-4, First hook 1222-1-5, First spare interface 1222-1-6, Sampling pipe 1222-1-7, Fourth shielding part 1222-2, Fifth shielding part 1 222-3, Second access port 1222-3-1, Second shielding door 1222-3-2, Third hinge 1222-3-3, Second locking block 1222-3-4, Second hook 1222-3-5, Third shielding component 1223, Fourth shielding component 1224, Interface channel 1224-1, Spare interface cover 1224-2, Second spare interface 1224-3, Shielding base plate 1230, Second viewing window 1240, Viewing glass component 124 1. First viewing glass 1241-1, second viewing glass 1241-2, third viewing glass 1241-3, fourth viewing glass 1241-4, viewing glass mounting base 1242, viewing glass mounting hole 1242-1, first mounting hole section 1242-1-1, second mounting hole section 1242-1-2, third mounting hole section 1242-1-3, first end cap 1242-2, second end cap 1242-3, fastener 1242-4;

[0041] The first intake and exhaust assembly 1300, the first intake filter 1310, the first intake passage 1320, the first intake valve 1330, the first exhaust passage 1340, the first exhaust valve 1350, the first exhaust filter 1360, and the first collection pipe 1370.

[0042] Second intake and exhaust assembly 1400, second intake filter 1410, second intake passage 1420, second intake valve 1430, second exhaust passage 1440, second exhaust valve 1450, second exhaust filter 1460, second collection pipe 1470.

[0043] Lighting assembly 1500, first light 1510, second light 1520;

[0044] Control component 1600, mounting arm 1610, display 1620, electrical integration cabinet 1630;

[0045] Image acquisition component 1700, first camera 1710, second camera 1720;

[0046] The isolation plate is 1800, the opening is 1810, the first pressure gauge is 1820, and the second pressure gauge is 1830.

[0047] Support component 1900, bracket 1910, support 1920. Detailed Implementation

[0048] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0049] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and 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 application.

[0050] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0051] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0052] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "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. Similarly, "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.

[0053] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0054] Please see Figures 1 to 3 , Figure 1This diagram shows a horizontal cross-sectional view of a positron annihilation lifetime measurement system according to an embodiment of this application. The positron annihilation lifetime measurement system 1000 provided in this embodiment includes: a housing assembly 1100 and a shielding layer 1200. The housing assembly 1100 includes an operating box 1110, which houses a radiation source 1111, an operating platform 1112, and a detector 1113. The radiation source 1111 is mounted on the operating platform 1112 and is used to emit positrons to a sample (not shown). The detector 1113 is mounted on the operating platform 1112 and is used to measure the positron annihilation lifetime. A shielding layer 1200 covers the outer surface of the housing assembly 1100 to shield the radiation generated by the radiation source 1111. The shielding layer 1200 is provided with a first access port 1222-1-1, which communicates with the inner cavity of the operating box 1110. A first shielding door 1222-1-2 is provided at the location where the first access port 1222-1-1 is located on the shielding layer 1200. The first shielding door 1222-1-2 is hinged to the shielding layer 1200 and can rotate around the hinge point between itself and the shielding layer 1200 to close and open the first access port 1222-1-1.

[0055] In this embodiment, the positron annihilation lifetime measurement system 1000 includes an operating box 1110 containing a radiation source 1111, an operating platform 1112, and a detector 1113. The radiation source 1111 is positioned on the operating platform 1112. The operator places the sample to be tested on the operating platform 1112, and the detector 1113 detects the positron annihilation lifetime emitted by the radiation source towards the sample. This allows the operator to determine the type of defects present in the sample. By providing a shielding layer 1200 covering the outer surface of the box assembly 1100, the positron annihilation lifetime measurement system 1000 can effectively detect positrons with radioactive content. When testing a radioactive sample, the shielding layer 1200 can be used to isolate the chamber assembly 1100 from the external environment, thereby preventing the radiation generated by the sample inside the chamber 1110 from spreading to the outside world and avoiding radiation exposure to external personnel. This ultimately achieves safe measurement of the radioactive sample. In summary, in this embodiment, by setting the shielding layer 1200 to cover the outer surface of the chamber assembly 1100, the chamber assembly 1100 is isolated from the external environment, which can prevent external personnel from being exposed to radiation from the radioactive sample and achieve safe measurement of the radioactive sample.

[0056] Please see Figures 1 to 3In some embodiments, the housing assembly 1100 includes a transition box 1120 and a connecting channel 1130. The transition box 1120 is spaced apart on one side of the operating box 1110, and the connecting channel 1130 is disposed between the operating box 1110 and the transition box 1120. The inner cavity of the operating box 1110 and the inner cavity of the transition box 1120 are connected through the connecting channel 1130. The transition box 1120 is provided with a connecting door 1121, which is hinged to the cavity wall of the transition box 1120 and can rotate about its hinge point with the transition box 1120. The connection channel 1130 is opened or closed. The shielding layer 1200 is provided with a second pick-up and drop-off port 1222-3-1, which is connected to the inner cavity of the transition box 1120. A second shielding door 1222-3-2 is provided at the location of the second pick-up and drop-off port 1222-3-1 on the shielding layer 1200. The second shielding door 1222-3-2 is hinged to the shielding layer 1200 and can rotate around the hinge point between itself and the shielding layer 1200 to close and open the second pick-up and drop-off port 1222-3-1.

[0057] In this embodiment, a transition box 1120 is spaced apart on one side of the operation box 1110. The inner cavity of the operation box 1110 and the inner cavity of the transition box 1120 are connected through a connecting channel 1130. A connecting door 1121 is hinged to the cavity wall of the transition box 1120 to open or close the connecting channel 1130. The second take-up and put-out port 1222-3-1 is connected to the inner cavity of the transition box 1120. The second shielding door 1222-3-2 is hinged to the shielding layer 1200 to close and open the second take-up and put-out port 1222-3-1. This allows staff to open the second shielding door 1222-3-2 and use mechanical equipment to place the lead container (not shown) containing the sample to be tested into the transition box 1120 through the second loading / unloading port 1222-3-1. Then, the second shielding door 1222-3-2 is closed, and the sample to be tested is removed from the lead container. When the negative pressure in the transition box 1120 is the same as the negative pressure in the operating box 1110, the connecting door 1121 is opened, and the sample to be tested is placed on the operating platform 1112 in the operating box 1110 through the connecting channel 1130. Finally, the connecting door 1121 is closed, completing the operation of placing the sample to be tested into the operating box 1110. As can be seen from the above analysis, the setting of the transition box 1120 ensures that the operating box 1110 does not need to exchange air with the outside during the process of placing the sample to be tested into the operating box 1110, thus avoiding the diffusion of radiation gas in the operating box 1110 to the outside and causing harm to the staff.

[0058] In some embodiments, the operating box 1110 is made of 06Cr19Ni10 stainless steel. The wall thickness of the operating box 1110 on both sides along its own gravity direction is greater than or equal to 30mm, and the wall thickness of the remaining boxes is greater than or equal to 5mm. The inner surface of the operating box 1110 is polished to a roughness of not less than Ra0.8μm. At the connection between any two adjacent boxes in the operating box 1110, the weld roughness is ground and polished to a roughness of not less than Ra1.6μm.

[0059] In some embodiments, the transition box 1120 is made of 06Cr19Ni10 stainless steel. The wall thickness of the transition box 1120 on both sides along its own gravity direction is 30mm, and the wall thickness of the remaining boxes reaches 5mm. The inner surface of the transition box 1120 is polished to a roughness of not less than Ra0.8μm. At the connection between any two adjacent boxes in the transition box 1120, the weld roughness is ground and polished to not less than Ra1.6μm.

[0060] In some embodiments, the transition box 1120 is spaced apart on one side of the operation box 1110 along the second direction, and the connecting channel 1130 is disposed between the operation box 1110 and the transition box 1120. The inner cavity of the operation box 1110 and the inner cavity of the transition box 1120 are connected through the connecting channel 1130.

[0061] In some embodiments, the connecting door 1121 includes a connecting door body 1121-1, a first hinge 1121-2, and a first protrusion 1121-3. The first hinge 1121-2 is disposed on the side of the cavity wall of the transition box 1120 near the operation box 1110. One side of the connecting door body 1121-1 is hinged to the first hinge 1121-2. The connecting door body 1121-1 can rotate about its hinge point with the first hinge 1121-2 to open or close the connecting channel 1130.

[0062] In some embodiments, the connecting door body 1121-1 is provided with a first protrusion 1121-3 on the side opposite to the first hinge 1121-2. The first protrusion 1121-3 is in concave-convex engagement with a first groove (not shown). The first groove is provided on the cavity wall of the transition box 1120 on the side close to the operation box 1110. The first protrusion 1121-3 is engaged in the first groove when the connecting door body 1121-1 closes the connecting channel 1130, and the first protrusion 1121-3 is disengaged from the first groove when the connecting door body 1121-1 opens the connecting channel 1130.

[0063] In some embodiments, the shielding layer 1200 includes a shielding side plate 1220, which includes a first shielding member 1221 and a second shielding member 1222. The first shielding member 1221 includes a first shielding portion 1221-1, and the second shielding member 1222 includes a third shielding portion 1222-1. The first shielding portion 1221-1 and the third shielding portion 1222-1 are respectively disposed on opposite sides of the operation box 1110 along the first direction.

[0064] In this embodiment, by setting the first shielding part 1221-1 and the third shielding part 1222-1, which are respectively set on opposite sides of the operation box 1110 along the first direction, the radiation generated by the sample to be tested inside the operation box 1110 can be prevented from diffusing from the operation box 1110 to the outside along the first direction.

[0065] In some embodiments, the first shielding part 1221-1 is made of Q235-B carbon steel and has a thickness of 145mm, and the third shielding part 1222-1 is made of Q235-B carbon steel and has a thickness of 110mm, in order to meet the shielding requirements of 1Ci.

[0066] In some embodiments, the first shielding portion 1221-1 extends along a second direction from the side of the operation box 1110 away from the transition box 1120 to the side of the transition box 1120 away from the operation box 1110.

[0067] In some embodiments, the third shielding portion 1222-1 extends along a second direction from the side of the operating box 1110 away from the transition box 1120 to the side of the operating box 1110 near the transition box 1120.

[0068] In some embodiments, a first pick-up / placement port 1222-1-1 is provided on a third shielding part 1222-1. The first pick-up / placement port 1222-1-1 communicates with the inner cavity of the operation box 1110. A second hinge 1222-1-3 is provided on the third shielding part 1222-1-1. The second hinge 1222-1-3 is located on one side of the first pick-up / placement port 1222-1-1 along the second direction. The first shielding door 1222-1-2 is hinged to the second hinge 1222-1-3 on one side along the second direction. The first shielding door 1222-1-2 can rotate around the hinge point between itself and the second hinge 1222-1-3 to open or close the first pick-up / placement port 1222-1-1.

[0069] In some embodiments, the first shielding door 1222-1-2 is provided with a first locking block 1222-1-4 on the side of the first shielding door 1222-1-2 away from the second hinge 1222-1-3 along the second direction, and the third shielding part 1222-1 is provided with a first hook 1222-1-5. The first hook 1222-1-5 is located on the side of the first pick-up and put-out port 1222-1-1 away from the second hinge 1222-1-3 along the second direction. The first hook 1222-1-5 has a first locking part (not shown). The first hook 1222-1-5 is slidably connected to the third shielding part 1222-1 and can move relative to the third shielding part 1222-1 along the first direction to adjust the distance between the first locking part and the third shielding part 1222-1 in the first direction, so that the first locking block 1222-1-4 is engaged in the gap between the first locking part and the third shielding part 1222-1.

[0070] In some embodiments, the shielding layer 1200 includes a shielding cover plate 1210 and a shielding base plate 1230, which are respectively disposed on opposite sides of the operating box 1110 along its own gravity direction.

[0071] In this embodiment, by setting a shielding cover plate 1210 on one side of the operating box 1110 along its own gravity direction and a shielding base plate 1230 on the other side, the radiation generated by the sample to be tested can be prevented from diffusing from the operating box 1110 and the transition box 1120 to the outside along the gravity direction of the operating box 1110.

[0072] In some embodiments, the shielding cover 1210 is made of Q235-B carbon steel and has a thickness of 110mm, and the shielding base plate 1230 is made of Q235-B carbon steel and has a thickness of 110mm, in order to meet the shielding requirements of 1Ci.

[0073] In some embodiments, the shielding cover 1210 extends along a second direction from the side of the operating box 1110 away from the transition box 1120 to the side of the transition box 1120 away from the operating box 1110; the shielding base plate 1230 extends along a second direction from the side of the operating box 1110 away from the transition box 1120 to the side of the transition box 1120 away from the operating box 1110 along the second direction.

[0074] In some embodiments, the first shielding part 1221-1 is connected to the shielding base plate 1230 on the side opposite to the shielding cover plate 1210 along the gravity direction of the operating box 1110.

[0075] In some embodiments, the third shielding part 1222-1 is connected to the shielding cover plate 1210 on one side along the gravity direction of the operating box 1110, and to the shielding base plate 1230 on the other side.

[0076] In some embodiments, the shielding layer 1200 includes a second shielding portion 1221-7. The second shielding portion 1221-7 is disposed on the side of the first shielding portion 1221-1 away from the shielding base plate 1230 along the gravity direction of the operating box 1110. One end of the second shielding portion 1221-7 along the gravity direction of the operating box 1110 is connected to the first shielding portion 1221-1, and the other end is connected to the shielding cover plate 1210. The second shielding portion 1221-7 extends along a second direction from the side of the operating box 111 away from the transition box 1120 to the side of the transition box 1120 away from the operating box 1110. From the direction of the first shielding portion 1221-1 toward the shielding cover plate 1210, the distance between the second shielding portion 1221-7 and the third shielding portion 1222-1 gradually decreases in the first direction.

[0077] In this embodiment, the first shielding part 1221-1 and the second shielding part 1221-7 together form the first shielding member 1221, which is used to prevent the radiation generated by the sample to be tested from the operation box 1110 and the transition box 1120 from spreading to the outside along the side opposite to the third shielding part 1222-1.

[0078] In some embodiments, the second shielding part 1221-7 is made of Q235-B carbon steel and has a thickness of 110mm to meet the shielding requirements of 1Ci.

[0079] In some embodiments, the second shielding member 1222 includes a fifth shielding portion 1222-3, which is disposed on the side of the transition box 1120 away from the first shielding portion 1221-1 along a first direction, and extends along a second direction from the side of the operation box 1110 near the transition box 1120 to the side of the transition box 1120 away from the operation box 1110.

[0080] In this embodiment, by placing the fifth shielding part 1222-3 on the side of the transition box 1120 away from the first shielding part 1221-1 along the first direction, the radiation generated by the sample under test can be prevented from diffusing from the side of the transition box 1120 away from the first shielding part 1221-1 along the first direction to the outside.

[0081] In some embodiments, the fifth shielding part 1222-3 is made of Q235-B carbon steel and has a thickness of 110mm to meet the shielding requirements of 1Ci.

[0082] In some embodiments, the fifth shielding part 1222-3 is connected to the shielding cover plate 1210 on one side along the gravity direction of the operating box 1110, and to the shielding base plate 1230 on the other side.

[0083] In some embodiments, the second pick-up and release port 1222-3-1 is disposed on the fifth shielding part 1222-3. The second pick-up and release port 1222-3-1 communicates with the inner cavity of the transition box 1120. The second pick-up and release port 1222-3-1 is provided with a third hinge 1222-3-3 on one side along the second direction. The second shielding door 1222-3-2 is hinged to the third hinge 1222-3-3 and can rotate around the hinge point between itself and the third hinge 1222-3-3 to open or close the second pick-up and release port 1222-3-1.

[0084] In some embodiments, the second shielding door 1222-3-2 is provided with a second locking block 1222-3-4 on the side opposite to the third hinge 1222-3-3 along the second direction, and the fifth shielding part 1222-3 is provided with a second hook 1222-3-5. The second hook 1222-3-5 is located on the side of the second take-up and put-out port 1222-3-1 opposite to the third hinge 1222-3-3 along the second direction. The second hook 1222-3-5 has a second locking part (not shown). The second hook 1222-3-5 is slidably connected to the fifth shielding part 1222-3 and can move relative to the fifth shielding part 1222-3 along the first direction to adjust the distance between the second locking part and the fifth shielding part 1222-3 in the first direction, so that the second locking block 1222-3-4 is engaged in the gap between the second locking part and the fifth shielding part 1222-3.

[0085] In some embodiments, the distance between the third shielding part 1222-1 and the first shielding part 1221-1 in the first direction is a first value, and the distance between the fifth shielding part and the first shielding part 1221-1 in the first direction is a second value, wherein the first value is greater than the second value; the second shielding member 1222 includes a fourth shielding part 1222-2, which is disposed on the side of the operating box 1110 near the transition box 1120 and located between the third shielding part 1222-1 and the fifth shielding part 1222-3. The fourth shielding part 1222-2 extends along the first direction, with one end of the fourth shielding part 1222-2 connected to the third shielding part 1222-1 and the other end connected to the fifth shielding part 1222-3.

[0086] In this embodiment, by placing the fourth shielding part 1222-2 on the side of the operation box 1110 near the transition box 1120, the radiation generated by the sample under test can be prevented from diffusing to the outside from the side of the operation box 1110 near the transition box 1120.

[0087] In some embodiments, the fourth shielding part 1222-2 is made of Q235-B carbon steel and has a thickness of 110mm to meet the shielding requirements of 1Ci.

[0088] In some embodiments, the shielding base plate 1230 is connected to the shielding cover plate 1210 on one side along the gravity direction of the operating box 1110, and to the shielding base plate 1230 on the other side.

[0089] In some embodiments, the shielding layer 1200 includes a third shielding member 1223, which is disposed on the side of the transition box 1120 away from the operation box 1110 along the second direction. The third shielding member 1223 is connected to the first shielding part 1221-1 on one side along the first direction and to the fifth shielding part on the other side.

[0090] In this embodiment, by placing the third shield 1223 on the side of the transition box 1120 away from the operation box 1110 along the second direction, the radiation generated by the sample to be tested can be prevented from diffusing from the side of the transition box 1120 away from the operation box 1110 along the second direction to the outside.

[0091] In some embodiments, the third shielding element 1223 is made of Q235-B carbon steel and has a thickness of 110mm to meet the shielding requirements of 1Ci.

[0092] In some embodiments, the third shielding member 1223 is connected to the shielding cover plate 1210 on one side along the gravity direction of the operating box 1110, and to the shielding base plate 1230 on the other side.

[0093] In some embodiments, the shielding layer 1200 includes a fourth shielding member 1224. The fourth shielding member 1224 is disposed on the side of the operating box 1110 away from the transition box 1120 along the second direction. The fourth shielding member 1224 is connected to the first shielding part 1221-1 on one side along the first direction and to the fifth shielding part on the other side. The fourth shielding member 1224 is connected to the shielding cover plate 1210 on one side along the gravity direction of the operating box 1110 and to the shielding bottom plate 1230 on the other side.

[0094] In this embodiment, by placing the fourth shielding member 1224 on the side of the operating box 1110 away from the transition box 1120 along the second direction, the radiation generated by the sample to be tested can be prevented from diffusing from the side of the operating box 1110 away from the transition box 1120 along the second direction to the outside.

[0095] In some embodiments, the fourth shielding element 1224 is made of Q235-B carbon steel and has a thickness of 110mm to meet the shielding requirements of 1Ci.

[0096] In some embodiments, the fourth shielding member 1224 is connected to the shielding cover plate 1210 on one side along the gravity direction of the operating box 1110, and to the shielding base plate 1230 on the other side.

[0097] Please see Figures 1 to 3 In some embodiments, a first operation channel 1221-2 is provided on one side of the shielding layer 1200. The first operation channel 1221-2 includes a plurality of first operation ports 1221-2-1. Along the arrangement direction of the operation box 1110 and the transition box 1120, the plurality of first operation ports 1221-2-1 are arranged at intervals. Each first operation port 1221-2-1 is connected to the inner cavity of the transition box 1120. A first operation door 1221-3 is hinged to the shielding layer 1200 at the position corresponding to each first operation port 1221-2-1. Each first operation door 1221-3 can rotate around its hinge point with the shielding layer 1200 to open and close the corresponding first operation port 1221-2-1.

[0098] In this embodiment, by setting the first operating port 1221-2-1 to communicate with the inner cavity of the transition box 1120, the operator can wear shielding gloves and insert their hand into the inner cavity of the transition box 1120 through the first operating port 1221-2-1 to open the lead container containing the sample to be tested and remove the sample from the lead container. By setting multiple first operating ports 1221-2-1 to be spaced apart along the arrangement direction of the operating box 1110 and the transition box 1120, the operator can sequentially insert their hand into the inner cavity of the transition box 1120 through multiple first operating ports 1221-2-1 in the direction from the transition box 1120 to the operating box 1110 to move the sample to be tested along the direction from the operating box 1110 to the transition box 1120. The arrangement of the 20 is closer to the operation box 1110, which makes it easier for the staff to put the sample to be tested into the inner cavity of the operation box 1110 through the connecting channel 1130. By setting the shielding layer 1200 to hinge the first operation door 1221-3 at the position corresponding to each first operation port 1221-2-1, each first operation door 1221-3 can rotate around its hinge point with the shielding layer 1200 to open and close the corresponding first operation port 1221-2-1. This is to isolate the first operation port 1221-2-1 from the outside when the staff does not move the sample to be tested, thereby preventing the radiation generated by the sample to be tested from the first operation port 1221-2-1 from spreading from the transition box 1120 to the outside.

[0099] In some embodiments, the first shielding part 1221-1 is provided with a first operation channel 1221-2, which includes a plurality of first operation ports 1221-2-1. Along the arrangement direction of the operation box 1110 and the transition box 1120, the plurality of first operation ports 1221-2-1 are arranged at intervals. Each first operation port 1221-2-1 communicates with the inner cavity of the transition box 1120. A first operation door 1221-3 is hinged to the first shielding part 1221-1 at the position corresponding to each first operation port 1221-2-1. Each first operation door 1221-3 can rotate around its hinge point with the first shielding part 1221-1 to open and close the corresponding first operation port 1221-2-1.

[0100] Please see Figures 1 to 3 In some embodiments, the shielding layer 1200 is provided with a second operation channel 1221-4, which is spaced apart from the first operation channel 1221-2 along the arrangement direction of the operation box 1110 and the transition box 1120. The second operation channel 1221-4 includes a plurality of second operation ports 1221-4-1, which are spaced apart along the arrangement direction of the operation box 1110 and the transition box 1120. Each second operation port 1221-4-1 is connected to the inner cavity of the operation box 1110. A second operation door 1221-5 is hinged to the shielding layer 1200 at the position corresponding to each second operation port 1221-4-1. Each second operation door 1221-5 can rotate around its hinge point with the shielding layer 1200 to open and close the corresponding second operation port 1221-4-1.

[0101] In this embodiment, by providing a second operating port 1221-4-1 that communicates with the inner cavity of the operating box 1110, operators can wear protective gloves and insert their hands into the inner cavity of the operating box 1110 through the second operating port 1221-4-1 to move the sample to be tested within the operating box 1110. By providing multiple second operating ports 1221-4-1 spaced apart along the arrangement direction of the operating box 1110 and the transition box 1120, operators can sequentially insert their hands into the inner cavity of the operating box 1110 through multiple second operating ports 1221-4-1 in the direction from the transition box 1120 towards the operating box 1110 to move the sample to be tested closer to the operating platform 1112. The sample is moved in the direction of the test until it is placed on the operating platform 1112. A second operating door 1221-5 is hinged to each second operating port 1221-4-1 on the shielding layer 1200. Each second operating door 1221-5 can rotate around its hinge point with the shielding layer 1200 to open and close the corresponding second operating port 1221-4-1. This is to isolate the first operating port 1221-2-1 from the outside when the operator's hand is removed from the inner cavity of the operating box 1110 through the second operating port 1221-4-1, and to prevent the radiation generated by the sample from the test from the second operating port 1221-4-1 from spreading from the operating box 1110 to the outside.

[0102] In some embodiments, the first shielding part 1221-1 is provided with a second operation channel 1221-4. The second operation channel 1221-4 and the first operation channel 1221-2 are arranged at intervals along the arrangement direction of the operation box 1110 and the transition box 1120. The second operation channel 1221-4 includes a plurality of second operation ports 1221-4-1. The plurality of second operation ports 1221-4-1 are arranged at intervals along the arrangement direction of the operation box 1110 and the transition box 1120. Each second operation port 1221-4-1 communicates with the inner cavity of the operation box 1110. A second operation door 1221-5 is hinged to the first shielding part 1221-1 at the position corresponding to each second operation port 1221-4-1. Each second operation door 1221-5 can rotate around its hinge point with the first shielding part 1221-1 to open and close the corresponding second operation port 1221-4-1.

[0103] Please see Figures 1 to 3 In some embodiments, the positron annihilation lifetime measurement system 1000 includes an operating glove 1221-6. An operating glove 1221-6 is worn inside each first operating port 1221-2-1 and each second operating port 1221-4-1. The inner wall of each first operating port 1221-2-1 is sealed to the outer surface of the corresponding operating glove 1221-6, and the inner wall of each second operating port 1221-4-1 is sealed to the outer surface of the corresponding operating glove 1221-6.

[0104] In this embodiment, by ensuring that the inner wall of each first operating port 1221-2-1 is sealed to the outer surface of the corresponding operating glove 1221-6, radiation generated by the sample under test can be prevented from leaking to the outside through the gap between the inner wall of the first operating port 1221-2-1 and the outer surface of the corresponding operating glove 1221-6. Similarly, by ensuring that the inner wall of each second operating port 1221-4-1 is sealed to the outer surface of the corresponding operating glove 1221-6, radiation generated by the sample under test can be prevented from leaking to the outside through the gap between the inner wall of the second operating port 1221-4-1 and the outer surface of the corresponding operating glove 1221-6.

[0105] In some embodiments, the first operating port 1221-2-1 includes a first operating hole section (not shown) and a second operating hole section (not shown) that are coaxially arranged and interconnected. The first operating hole section penetrates the first shielding part 1221-1, and the second operating hole section penetrates the box wall of the transition box 1120. The diameter of the first operating hole section is larger than the diameter of the second operating hole section. The inner wall of the second operating hole section of the first operating port 1221-2-1 is sealed to the outer surface of the corresponding operating glove 1221-6.

[0106] In some embodiments, the second operating port 1221-4-1 includes a third operating hole section (not shown) and a fourth operating hole section (not shown) that are coaxially arranged and interconnected. The third operating hole section penetrates the first shielding part 1221-1, and the fourth operating hole section penetrates the box wall of the operating box 1110. The diameter of the third operating hole section is larger than the diameter of the fourth operating hole section. The inner wall of the third operating hole section of the second operating port 1221-4-1 is sealed to the outer surface of the corresponding operating glove 1221-6.

[0107] Please see Figures 1 to 3 In some embodiments, the outer surface of the operating gloves 1221-6 is covered with a shielding layer (not shown).

[0108] In this embodiment, by covering the outer surface of the operating glove 1221-6 with a shielding layer, the radiation generated by the sample to be tested can be prevented from penetrating the outer surface of the operating glove 1221-6 and causing harm to the human body, thereby ensuring the safety of the operator.

[0109] It should be noted that the aforementioned shielding layer refers to a lead layer with a thickness of 0.1 mm.

[0110] In some embodiments, the operating glove 1221-6 is made of high-quality neoprene rubber, and the length of the operating glove 1221-6 is greater than or equal to 810 mm, so that the operator's hand can reach deeper into the operating box 1110 or the transition box 1120. The thickness of the operating glove 1221-6 is 0.8 mm.

[0111] Please see Figures 1 to 3 In some embodiments, a plurality of first viewing ports 1140 are provided on one side of the housing assembly 1100. The plurality of first viewing ports 1140 are spaced apart along the arrangement direction of the operating box 1110 and the transition box 1120. Among the plurality of first viewing ports 1140, a portion of the first viewing ports 1140 communicates with the inner cavity of the transition box 1120, and another portion of the first viewing ports 1140 communicates with the inner cavity of the operating box 1110. Each first viewing port 1140 is embedded with a first viewing window 1150. A plurality of second viewing ports 1221-7-1 are provided on the shielding layer 1200. The plurality of second viewing ports 1221-7-1 are arranged one-to-one with the plurality of first viewing ports 1140. Each second viewing port 1221-7-1 communicates with the corresponding first viewing port 1140. Each second viewing port 1221-7-1 is embedded with a second viewing window 1240.

[0112] In this embodiment, the operator can observe the position of the sample to be tested within the cavity of the transition box 1120 through the first viewing port 1140, which communicates with the cavity of the transition box 1120. By embedding a first viewing window 1150 within the first viewing port 1140, the operator can observe the position of the sample to be tested within the transition box 1120 through the first viewing window 1150, and prevent radiation generated by the sample to be tested from diffusing from the cavity of the transition box 1120 to the outside through the first viewing port 1140. Furthermore, by providing a viewing window 1150 on the shielding layer 1200, the operator can observe the position of the sample to be tested within the transition box 1120, and prevent radiation generated by the sample to be tested from diffusing from the cavity of the transition box 1120 to the outside through the first viewing port 1140. The second viewing port 1221-7-1 corresponding to the first viewing port 1140 allows staff to observe the position of the sample to be tested in the transition box 1120 through the first viewing window 1150 via the second viewing port 1221-7-1. By embedding the second viewing window 1240 within the second viewing port 1221-7-1, the radiation generated by the sample to be tested is isolated from the outside world, and it also allows staff to observe the position of the sample to be tested in the transition box 1120 via the first viewing window 1150 embedded in the first viewing port 1140, which is connected to the inner cavity of the transition box 1120, through the second viewing window 1240.

[0113] Staff can observe the position of the sample to be tested within the inner cavity of the operating box 1110 through the first viewing port 1140, which communicates with the inner cavity of the operating box 1110. A first viewing window 1150 is embedded within the first viewing port 1140, allowing staff to observe the position of the sample to be tested within the operating box 1110, and preventing radiation generated by the sample from diffusing from the inner cavity of the operating box 1110 to the outside through the first viewing port 1140. A connection is made to the shielding layer 1200 via the first viewing port 1140. The second viewing port 1221-7-1 corresponding to 0 allows staff to observe the position of the sample to be tested in the operating box 1110 through the first viewing window 1150 via the second viewing port 1221-7-1; by embedding the second viewing window 1240 in the second viewing port 1221-7-1, the radiation generated by the sample to be tested is isolated from the outside world, and it also allows staff to observe the position of the sample to be tested in the operating box 1110 via the first viewing window 1150 embedded in the first viewing port 1140 which communicates with the inner cavity of the operating box 1110 through the second viewing window 1240.

[0114] In some embodiments, a first viewing port 1140 is disposed on the side of the operation box 1110 and the transition box 1120 away from the third shielding part 1222-1 along the first direction, and a second viewing port 1221-7-1 is disposed on the second shielding part 1221-7.

[0115] In some embodiments, the central axis of the second viewing port 1221-7-1 coincides with the central axis of the first viewing port 1140 and is parallel to the central axis of the second shielding portion 1221-7.

[0116] In some embodiments, the first viewing window 1150 includes a first viewing glass plate 1151 and a first mounting flange 1152. The first mounting flange 1152 is sleeved on the outer periphery of the first viewing glass plate 1151 and is disposed on the side of the housing assembly 1100 near the shielding layer 1200.

[0117] In some embodiments, the first viewing glass plate 1151 is PC glass with a thickness of 12 mm or more.

[0118] In some embodiments, the first viewing window 1150 includes a first cover 1153, the first cover 1153 includes a first baffle 1153-1, a first pressure plate 1153-2 and a first fastener 1153-3. The first baffle 1153-1 is disposed around the outer periphery of the first mounting flange 1152 and is disposed on the side of the housing assembly 1100 near the shielding layer 1200. The first pressure plate 1153-2 is disposed on the side of the first baffle 1153-1 away from the housing assembly 1100 and is disposed around the outer periphery of the first viewing glass plate 1151. The first pressure plate 1153-2 is provided with the first fastener 1153-3. The first fastener 1153-3 applies a clamping force to the first mounting flange 1152 to press the first mounting flange 1152 against the side of the housing assembly 1100 near the shielding layer 1200.

[0119] In this embodiment, the first mounting flange 1152 is pressed against the first mounting flange 1152 by the first fastener 1153-3, thereby pressing the first mounting flange 1152 against the side of the housing assembly 1100 near the shielding layer 1200, thereby fixing the first viewing glass plate 1151. The structure is simple and facilitates the installation of the first viewing glass plate 1151.

[0120] In some embodiments, the first viewing window 1150 includes a first seal disposed between the outer peripheral surface of the first viewing glass plate 1151 and the inner wall of the first mounting flange 1152.

[0121] In some embodiments, the second viewing window 1240 includes a viewing glass element 1241 and a viewing glass mounting base 1242, the viewing glass mounting base 1242 being embedded in the second viewing port 1221-7-1, and the viewing glass element 1241 being embedded in the viewing glass mounting base 1242.

[0122] In some embodiments, the peep glass mounting base 1242 includes a peep glass mounting hole 1242-1, the peep glass mounting hole 1242-1 includes a first mounting hole segment 1242-1-1, the first mounting hole segment 1242-1-1 is disposed on the side of the peep glass mounting base 1242 near the operation box 1110, and the peep glass component 1241 includes a first peep glass 1241-1, the first peep glass 1241-1 passing through the first mounting hole segment 1242-1-1.

[0123] In some embodiments, the first viewing glass 1241-1 is ZF6 lead glass with a thickness of 60 mm or more.

[0124] In some embodiments, the viewing glass mounting hole 1242-1 includes a third mounting hole segment 1242-1-3, which is disposed on the side of the viewing glass mounting base 1242 away from the operation box 1110. The third mounting hole segment 1242-1-3 is coaxially disposed with the first mounting hole segment 1242-1-1 and communicates with each other. The viewing glass component 1241 includes a third viewing glass 1241-3, which passes through the third mounting hole segment 1242-1-3.

[0125] In some embodiments, the third viewing glass 1241-3 is ZF6 lead glass with a thickness of 60 mm or more.

[0126] In some embodiments, the peep glass mounting hole 1242-1 includes a second mounting hole segment 1242-1-2, one end of which communicates with the first mounting hole segment 1242-1-1, and the other end of which communicates with the third mounting hole segment 1242-1-3. The central axis of the second mounting hole segment 1242-1-2 is collinear with the central axis of the first mounting hole segment 1242-1-1 and the central axis of the third mounting hole segment 1242-1-3. The peep glass component 1241 includes a second peep glass 1241-2, which is inserted into the second mounting hole segment 1242-1-2.

[0127] In some embodiments, the second viewing glass 1241-2 is ZF6 lead glass with a thickness of 60 mm or more.

[0128] In some embodiments, the viewing glass mounting base 1242 includes a first end cap 1242-2, which covers the outside of the first mounting hole section 1242-1-1 and contacts the side of the first viewing glass 1241-1 opposite to the second viewing glass 1241-2 to prevent the first viewing glass 1241-1 from falling out of the first mounting hole section 1242-1-1. The first end cap 1242-2 is provided with a first end cap hole (not shown). Along the central axis direction of the first mounting hole section 1242-1-1, the outline of the projection of the first viewing glass 1241-1 on the second viewing glass 1241-2 surrounds the outside of the outline of the projection of the first end cap hole on the second viewing glass 1241-2.

[0129] In some embodiments, the peep glass mounting base 1242 includes a second end cap 1242-3, which covers the outside of the third mounting hole section 1242-1-3 and contacts the side of the third peep glass 1241-3 opposite to the second peep glass 1241-2 to prevent the third peep glass 1241-3 from falling out of the third mounting hole section 1242-1-3. The second end cap 1242-3 has a receiving groove (not shown) on the side near the third mounting hole section 1242-1-3. (Peeping glass element 1241...) Includes a fourth viewing glass 1241-4, which is disposed in a receiving groove. The second end cap 1242-3 has a second end cap hole (not shown) on the side opposite to the third mounting hole section 1242-1-3. The second end cap hole communicates with the receiving groove. Along the central axis of the third mounting hole section 1242-1-3, the outer contour of the projection of the fourth viewing glass 1241-4 on the second viewing glass 1241-2 surrounds the outer contour of the projection of the second end cap hole on the second viewing glass 1241-2.

[0130] In some embodiments, the fourth viewing glass 1241-4 is tempered glass with a thickness of 5 mm or more.

[0131] In some embodiments, along the central axis direction of the first mounting hole segment 1242-1-1, the outer contour of the projection of the third mounting hole segment 1242-1-3 on the second end cover 1242-3 surrounds the outer contour of the projection of the fourth viewing glass 1241-4 on the second end cover 1242-3; the outer contour of the projection of the second mounting hole segment 1242-1-2 on the second end cover 1242-3 surrounds the outer contour of the projection of the third mounting hole segment 1242-1-3 on the second end cover 1242-3; and the outer contour of the projection of the first mounting hole segment 1242-1-1 on the second end cover 1242-3 surrounds the outer contour of the projection of the second mounting hole segment 1242-1-2 on the second end cover 1242-3.

[0132] In some embodiments, the peep glass mounting base 1242 includes a fastener 1242-4, which is disposed around the outside of the first mounting hole section 1242-1-1, and is used to mount the peep glass mounting base 1242 to the second shielding portion 1221-7.

[0133] Please see Figures 1 to 3In some embodiments, the detector 1113 includes a starting gamma detector 1113-1, a first stopping gamma detector 1113-2, and a second stopping gamma detector 1113-3. The starting gamma detector 1113-1 is disposed on one side of the operating platform 1112 along the first direction and is used to detect the gamma rays generated by the cascade when the radioactive source 1111 emits positrons. The first stopping gamma detector 1113-2 and the second stopping gamma detector 1113-3 are disposed on both sides of the operating platform 1112 along the second direction, corresponding to each other. The gravity direction of the operating box 1110, the first direction, and the second direction are perpendicular to each other. The first stopping gamma detector 1113-2 and the second stopping gamma detector 1113-3 are used to detect the two annihilated gamma rays emitted in opposite directions after the annihilation of positrons.

[0134] In this embodiment, since the positrons generated by the radiation source 1111 are isotropically emitted into the inner cavity of the operating box 1110, some positrons enter the sample to be tested and are annihilated, while others do not enter the sample or penetrate it, ultimately annihilating in the wall of the operating box 1110. Annihilation of positrons in both the sample material and the wall material of the operating box 1110 will generate annihilated gamma photons. It is necessary to eliminate the influence of positron annihilation cases in the wall material of the operating box 1110 on the measurement. This is achieved by setting a first stop gamma detector 1113-2 and a second stop gamma detector 1113-3, which are correspondingly positioned in the operating box. Along the second direction on both sides of the platform 1112, since the two annihilation gamma rays generated by the annihilation of positrons on the wall of the operating box 1110 will not be detected simultaneously by the first stop gamma detector 1113-2 and the second stop gamma detector 1113-3, the above setting can eliminate positron annihilation cases in non-test samples by simultaneously detecting the two counter-emitted annihilation gamma rays generated after positron annihilation, screen out positron annihilation cases in the test samples, reduce the interference of positron annihilation cases in non-test samples on the detection results, and improve the detection accuracy of the positron annihilation lifetime measurement system 1000 on the test samples.

[0135] In some embodiments, the initial gamma detector 1113-1 is responsible for... 22 The 1.28 MeV gamma rays generated by the cascaded emission of positrons from the Na radioactive source are detected. The first stop gamma detector 1113-2 and the second stop gamma detector 1113-3 detect the two 0.511 MeV annihilation gamma rays emitted in opposite directions after the annihilation of the positrons, respectively.

[0136] Please see Figures 4 to 6In some embodiments, the positron annihilation lifetime measurement system 1000 includes a first intake and exhaust assembly 1300, which includes a first intake channel 1320 and a first exhaust channel 1340. One end of the first intake channel 1320 is connected to the inner cavity of the operation box 1110, and one end of the first exhaust channel 1340 is connected to the inner cavity of the operation box 1110. The other end of the first exhaust channel 1340 is connected to a first exhaust filter 1360.

[0137] In this embodiment, by setting one end of the first air intake channel 1320 to communicate with the inner cavity of the operating box 1110, dry and pure gas can be transmitted into the inner cavity of the operating box 1110. By setting one end of the first exhaust channel 1340 to communicate with the inner cavity of the operating box 1110, and the other end to be connected to the first exhaust filter 1360, the radiant gas in the inner cavity of the operating box 1110 can leave the operating box 1110 through the first exhaust channel 1340, and be discharged to the subsequent pipeline (not shown) after being filtered by the first exhaust filter 1360.

[0138] In some embodiments, the first intake and exhaust assembly 1300 is disposed on the shielding cover 1210.

[0139] In some embodiments, the first exhaust filter 1360 is used to filter radioactive substances from the gas.

[0140] In some embodiments, the first intake and exhaust assembly 1300 includes a first intake filter 1310, one end of the first intake channel 1320 is connected to the inner cavity of the control box 1110, and the other end is connected to the first intake filter 1310.

[0141] In some embodiments, the first intake and exhaust assembly 1300 includes a first intake valve 1330, which is disposed in the first intake passage 1320 and is used to adjust the gas flow rate through the first intake passage 1320.

[0142] In some embodiments, the first intake and exhaust assembly 1300 includes a first exhaust valve 1350, which is disposed in the first exhaust passage 1340 and is used to adjust the gas flow rate through the first exhaust passage 1340.

[0143] In some embodiments, the first intake and exhaust assembly 1300 includes a first collection pipe 1370, which is connected to the exhaust port of the first exhaust filter 1360 and is used to collect the gas filtered by the first exhaust filter 1360 so that the staff can judge the filtration effect of the first exhaust filter 1360 based on the gas filtered by the first exhaust filter 1360.

[0144] In some embodiments, the positron annihilation lifetime measurement system 1000 includes a second intake and exhaust assembly 1400, which includes a second intake passage 1420, a second exhaust passage 1440, and a second exhaust filter 1460. One end of the second intake passage 1420 is connected to the inner cavity of the transition box 1120, and the other end is connected to the second exhaust filter 1460.

[0145] In some embodiments, the second intake and exhaust assembly 1400 is disposed on the shielding cover 1210.

[0146] In some embodiments, the second intake and exhaust assembly 1400 includes a second intake filter 1410, one end of the second intake passage 1420 is connected to the inner cavity of the transition box 1120, and the other end is connected to the second intake filter 1410.

[0147] In some embodiments, the second intake and exhaust assembly 1400 includes a second intake valve 1430, which is disposed in the second intake passage 1420 and is used to adjust the gas flow rate through the second intake passage 1420.

[0148] In some embodiments, the second intake and exhaust assembly 1400 includes a second exhaust valve 1450, which is disposed in the second exhaust passage 1440 and is used to regulate the gas flow rate through the second exhaust passage 1440.

[0149] In some embodiments, the second intake and exhaust assembly 1400 includes a second collection pipe 1470, which is connected to the exhaust port of the second exhaust filter 1460 for collecting gas filtered by the second exhaust filter 1460, so that the operator can judge the filtration effect of the second exhaust filter 1460 based on the gas filtered by the second exhaust filter 1460.

[0150] In some embodiments, the positron annihilation lifetime measurement system 1000 includes an illumination assembly 1500, which includes a first illumination lamp 1510 and a second illumination lamp 1520. The first illumination lamp 1510 is disposed on the shielding cover 1210 and is used to emit light into the inner cavity of the operation box 1110 to illuminate the inner cavity of the operation box 1110. The second illumination lamp 1520 is disposed on the shielding cover 1210 and is used to emit light into the inner cavity of the transition box 1120 to illuminate the inner cavity of the transition box 1120.

[0151] In some embodiments, the positron annihilation lifetime measurement system 1000 includes a support assembly 1900, which includes a bracket 1910 and supports 1920. The bracket 1910 is disposed on the side of the shielding base plate 1230 away from the shielding cover plate 1210. A plurality of supports 1920 are spaced apart on the side of the bracket 1910 away from the shielding base plate 1230. Each support 1920 is slidably connected to the bracket 1910 and can move relative to the bracket 1910 along the direction of gravity of the operating box 1110.

[0152] Please see Figures 4 to 6 In some embodiments, the positron annihilation lifetime measurement system 1000 includes an isolation plate 1800, which is embedded in a wall (not shown). The isolation plate 1800 has an opening 1810 that penetrates the isolation plate 1800 along a first direction. A shielding layer 1200 passes through the opening 1810. The shielding layer 1200 has a first pick-up and drop-off port 1222-1-1 on one side along the first direction. The side of the isolation plate 1800 opposite to the first pick-up and drop-off port 1222-1-1 along the first direction is flush with the side of the shielding layer 1200 opposite to the first pick-up and drop-off port 1222-1-1 along the first direction.

[0153] In this embodiment, an isolation plate 1800 is embedded in the wall. The isolation plate 1800 has an opening 1810, and a shielding layer 1200 passes through the opening 1810. The shielding layer 1200 has a first pick-up and drop-off port 1222-1-1 on one side along the first direction. The side of the isolation plate 1800 away from the first pick-up and drop-off port 1222-1-1 along the first direction is flush with the side of the shielding layer 1200 away from the first pick-up and drop-off port 1222-1-1 along the first direction. This allows the housing assembly 1100 of the positron annihilation lifetime measurement system 1000 to be placed within the space enclosed by the wall, thereby better isolating the radiation generated by the sample under test from the external environment and preventing the radiation generated by the sample under test from spreading to the outside and causing damage to the human body.

[0154] In some embodiments, the positron annihilation lifetime measurement system 1000 includes a control component 1600, which includes a mounting arm 1610 and a display 1620. The display 1620 is spaced apart on the side of the isolation plate 1800 away from the third shielding portion 1222-1 along a first direction. The display 1620 is electrically connected to a first illumination lamp 1510 and a second illumination lamp 1520 and is used to control the illumination and extinguishing of the first illumination lamp 1510 and the second illumination lamp 1520. The mounting arm 1610 is disposed between the display 1620 and the isolation plate 1800. The mounting arm 1610 extends along the first direction, with one end connected to the display 1620 and the other end connected to the isolation plate 1800.

[0155] In some embodiments, the control component 1600 includes an electrical integrated cabinet 1630, which is disposed on the shielding cover 1210. The display 1620 is electrically connected to the first lighting lamp 1510 and the second lighting lamp 1520 through the electrical integrated cabinet 1630.

[0156] In some embodiments, the positron annihilation lifetime measurement system 1000 includes an image acquisition component 1700, which includes a first camera 1710 and a second camera 1720. Multiple first cameras 1710 are installed inside the operation box 1110 to capture images of the various devices within the operation box 1110 from all angles without blind spots. Each first camera 1710 is electrically connected to a display 1620 via an electrical integration cabinet 1630 and transmits the captured information to the display 1620 for display. Multiple second cameras 1720 are installed inside the transition box 1120 to capture images of the various devices within the transition box 1120 from all angles without blind spots. Each second camera 1720 is electrically connected to a display 1620 via an electrical integration cabinet 1630 and transmits the captured information to the display 1620 for display.

[0157] In some embodiments, the positron annihilation lifetime measurement system 1000 includes a first pressure sensor (not shown) and a second pressure sensor (not shown). The first pressure sensor is disposed in the inner cavity of the operating box 1110 and is used to detect the pressure inside the operating box 1110. The second pressure sensor is disposed in the inner cavity of the transition box 1120 and is used to detect the pressure inside the transition box 1120. A first pressure gauge 1820 and a second pressure gauge 1830 are provided on the isolation plate 1800. The first pressure gauge 1820 is electrically connected to the first pressure sensor and is used to display the data detected by the first pressure sensor. The second pressure gauge 1830 is electrically connected to the second pressure sensor and is used to display the data detected by the second pressure sensor.

[0158] In some embodiments, the shielding cover plate 1210 is provided with a plurality of wire holes 1211, some of which are connected to the inner cavity of the operation box 1110 and others are connected to the inner cavity of the transition box 1120. Each wire hole 1211 is provided with an electric wire. The detector 1113, the first lighting lamp 1510, the second lighting lamp 1520, the first camera 1710, the second camera 1720, the first pressure sensor and the second pressure sensor in the box assembly 1100 are all connected to the electric wire. Each electric wire is provided with a shielding sleeve 1212 between the electric wire and the wall of the corresponding wire hole 1211 to prevent the radiation generated by the sample to be tested from the gap between the wire hole 1211 and the electric wire from the operation box 1110 or the transition box 1120 to the outside.

[0159] In some embodiments, the third shielding part 1222-1 is provided with a plurality of first spare interfaces 1222-1-6, each of which is used to plug in a wire that is electrically connected to the equipment in the operation box 1110 and the transition box 1120.

[0160] In some embodiments, the third shielding part 1222-1 is provided with a sampling pipe 1222-1-7, which is connected to the inner cavity of the operation box 1110, so that the operator can collect the gas in the operation box 1110 by opening / closing the sampling pipe 1222-1-7.

[0161] In some embodiments, the fourth shielding member 1224 is provided with an interface channel 1224-1, and a spare interface cover plate 1224-2 is provided inside the interface channel 1224-1. The spare interface cover plate 1224-2 isolates the interface channel 1224-1 from the outside. The spare interface cover plate 1224-2 is provided with a plurality of second spare interfaces 1224-3, and each second spare interface 1224-3 is used to plug in a wire that is electrically connected to the equipment in the operation box 1110 and the transition box 1120.

[0162] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0163] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A positron annihilation lifetime measurement system, characterized in that, The positron annihilation lifetime measurement system includes: The housing assembly includes an operating box, which contains a radiation source, an operating platform, and a detector. The radiation source is disposed on the operating platform and is used to emit positrons to the sample to be tested. The detector is disposed on the operating platform and is used to measure the annihilation lifetime of the positrons. A shielding layer is provided on the outer surface of the housing assembly to shield the radiation generated by the radiation source. The shielding layer is provided with a first access port, which communicates with the inner cavity of the operating box. A first shielding door is provided at the location where the first access port is opened on the shielding layer. The first shielding door is hinged to the shielding layer and can rotate around the hinge point between itself and the shielding layer to close and open the first access port. The housing assembly includes a transition box and a connecting channel. The transition box is spaced apart on one side of the operating box, and the connecting channel is located between the operating box and the transition box. The inner cavity of the operating box and the inner cavity of the transition box are connected through the connecting channel. The transition box is equipped with a connecting door, which is hinged to the cavity wall of the transition box and can rotate around the hinge point between itself and the transition box to open or close the connecting channel. The shielding layer is provided with a second access port, which communicates with the inner cavity of the transition box. The shielding layer is provided with a second shielding door at the location where the second access port is opened. The second shielding door is hinged to the shielding layer and can rotate around the hinge point between itself and the shielding layer to close and open the second access port. The detector includes a starting gamma detector, a first stopping gamma detector, and a second stopping gamma detector; The initial gamma detector is disposed on one side of the operating platform along the first direction, and the initial gamma detector is used to detect the gamma rays generated by the cascade when the radiation source emits positrons; The first and second stopping gamma detectors are respectively arranged on both sides of the operating platform along the second direction. The gravity direction of the operating box, the first direction and the second direction are perpendicular to each other. The first and second stopping gamma detectors are used to detect the two annihilation gamma rays emitted in opposite directions after the annihilation of positrons.

2. The positron annihilation lifetime measurement system according to claim 1, characterized in that, A first operating channel is provided on one side of the shielding layer; The first operation channel includes a plurality of first operation ports. Along the arrangement direction of the operation box and the transition box, the plurality of first operation ports are arranged at intervals, and each first operation port is connected to the inner cavity of the transition box. Each of the shielding layers is hinged with a first operating door at each of the first operating ports. Each first operating door can rotate around its hinge point with the shielding layer to open and close the corresponding first operating port.

3. The positron annihilation lifetime measurement system according to claim 2, characterized in that, The shielding layer is provided with a second operating channel, and the second operating channel and the first operating channel are spaced apart along the arrangement direction of the operating box and the transition box; The second operation channel includes a plurality of second operation ports, which are spaced apart along the arrangement direction of the operation box and the transition box, and each second operation port communicates with the inner cavity of the operation box; A second operating door is hinged to each of the second operating ports on the shielding layer. Each second operating door can rotate around its hinge point with the shielding layer to open and close the corresponding second operating port.

4. The positron annihilation lifetime measurement system according to claim 3, characterized in that, The positron annihilation lifetime measurement system includes an operating glove, and the operating glove is worn inside each of the first operating ports and each of the second operating ports; The inner wall of each first operating port is sealed to the outer surface of the corresponding operating glove, and the inner wall of each second operating port is sealed to the outer surface of the corresponding operating glove.

5. The positron annihilation lifetime measurement system according to claim 4, characterized in that, The outer surface of the operating gloves is covered with a shielding layer.

6. The positron annihilation lifetime measurement system according to claim 4, characterized in that, The box assembly has a plurality of first viewing ports on one side, and the plurality of first viewing ports are spaced apart along the arrangement direction of the operation box and the transition box; Of the plurality of first viewing ports, a portion of the first viewing ports are connected to the inner cavity of the transition box, and another portion of the first viewing ports are connected to the inner cavity of the operation box. Each first viewing port is provided with a first viewing window. The shielding layer is provided with a plurality of second viewing ports, which are configured one-to-one with a plurality of first viewing ports. Each second viewing port is connected to a corresponding first viewing port, and each second viewing port is embedded with a second viewing window.

7. The positron annihilation lifetime measurement system according to claim 1, characterized in that, The positron annihilation lifetime measurement system includes a first intake and exhaust assembly, which includes a first intake channel and a first exhaust channel. One end of the first air intake channel is connected to the inner cavity of the control box, one end of the first exhaust channel is connected to the inner cavity of the control box, and the other end of the first exhaust channel is connected to a first exhaust filter.

8. The positron annihilation lifetime measurement system according to claim 1, characterized in that, The positron annihilation lifetime measurement system includes an isolation plate embedded in a wall, and the isolation plate has an opening that penetrates the isolation plate along the first direction. The shielding layer passes through the opening, and the shielding layer has a first pick-and-place port on one side along the first direction. The isolation plate is flush with the shielding layer on the side away from the first pick-and-place port along the first direction.

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