Positron annihilation lifetime measurement system

Abstract

The invention relates to a positron annihilation lifetime measurement system, and the system comprises a box assembly which comprises a radioactive source, an operation platform and a detector which are disposed in an operation box, the radioactive source is disposed on the operation platform, the radioactive source is used for emitting positron to a to-be-measured sample, and the detector is used for measuring the positron annihilation lifetime, the shielding layer wraps the outer surface of the box body assembly and shields radiation generated by the radioactive source, a first taking and placing opening is formed in the shielding layer and communicated with an inner cavity of the operation box, the shielding layer is provided with a first shielding door, the first shielding door is hinged to the shielding layer, and the first shielding door can rotate around the hinge point of the first shielding door and the shielding layer. In conclusion, in the embodiment, the shielding layer is arranged to wrap the outer surface of the box body assembly, the box body assembly is isolated from the external environment, the body of an external worker can be prevented from being radiated by the radioactive sample, and safe measurement of the radioactive sample is achieved.

Description

Technical Field

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

[0002] Positron annihilation is a non-destructive and sensitive probe of atomic-level defects in materials, and has unique advantages in the study of material defect distribution and evolution. The positron annihilation lifetime measurement system is a non-destructive research method that uses the life cycle of positron annihilation radiation in condensed matter to study the microstructure, electron momentum distribution, defect state and other information inside the material. It can be used to study the degree of damage of nuclear energy materials under different irradiation temperatures and different irradiation doses, and characterize and analyze the types and concentrations of microscopic defects introduced by irradiation. In related technologies, the positron annihilation lifetime measurement system is used to perform positron annihilation measurements on radioactive samples. In this process, the body of the worker is easily exposed to the radiation of the radioactive sample, resulting in damage. The positron annihilation lifetime measurement system is difficult to safely measure radioactive samples. Summary of the invention

[0003] Based on this, it is necessary to provide a positron annihilation lifetime measurement system to address the problem that the current positron annihilation lifetime measurement system is difficult to safely measure radioactive samples.

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

[0005] A box assembly includes an operating box, wherein a radiation source, an operating platform and a detector are arranged in the operating box, wherein the radiation source is arranged on the operating platform and is used to emit positrons to a sample to be tested, and the detector is arranged on the operating platform and is used to measure the positron annihilation lifetime;

[0006] A shielding layer is coated on the outer surface of the box assembly to shield the radiation generated by the radiation source. The shielding layer is provided with a first access port, the first access port is communicated with the inner cavity of the operation box, and a first shielding door is provided at the position where the first access port is opened on the shielding layer. The first shielding door is hinged to the shielding layer, and the first shielding door 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 box assembly includes a transition box and a connecting channel, the transition box is spaced apart at one side of the operation box, the connecting channel is arranged between the operation box and the transition box, and the inner cavity of the operation box is connected with the inner cavity of the transition box through the connecting channel;

[0008] A connecting door is provided in the transition box, the connecting door is hinged to the cavity wall of the transition box, and can rotate around the hinge point between the connecting door and the transition box to open or close the connecting passage;

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

[0010] In one of the embodiments, 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, which are arranged at intervals along the arrangement direction of the operation box and the transition box, and each of the first operation ports is communicated with the inner cavity of the transition box;

[0012] A first operating door is hingedly connected to the shielding layer at a position corresponding to each of the first operating openings, and each of the first operating doors can rotate around a hinge point between itself and the shielding layer to open and close the corresponding first operating opening.

[0013] In one embodiment, a second operating channel is provided on the shielding layer, and the second operating channel and the first operating channel are arranged at intervals along the arrangement direction of the operating box and the transition box;

[0014] The second operation channel includes a plurality of second operation ports, which are arranged at intervals along the arrangement direction of the operation box and the transition box, and each of the second operation ports is communicated with the inner cavity of the operation box;

[0015] A second operating door is hingedly connected to the shielding layer at a position corresponding to each second operating port, and each second operating door can rotate around a hinge point between itself and the shielding layer to open and close the corresponding second operating port.

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

[0017] The inner wall of each of the first operating ports is in sealing cooperation with the outer surface of the corresponding operating glove, and the inner wall of each of the second operating ports is in sealing cooperation with 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 peep holes are provided on one side of the box assembly, and the plurality of first peep holes are arranged at intervals along the arrangement direction of the operation box and the transition box;

[0020] Among the plurality of first peep holes, a part of the first peep holes are communicated with the inner cavity of the transition box, and another part of the first peep holes are communicated with the inner cavity of the operation box, and a first peep window is embedded in each of the first peep holes;

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

[0022] In one of the embodiments, the detectors include a start gamma detector, a first stop gamma detector, and a second stop gamma detector;

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

[0024] The first stop gamma detector and the second stop gamma detector are arranged one by one 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 stop gamma detector and the second stop gamma detector are used to detect two reversely emitted annihilation gamma rays generated after positron annihilation.

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

[0026] One end of the first air inlet passage is in communication with the inner cavity of the operation box, one end of the first exhaust passage is in communication with the inner cavity of the operation box, and the other end of the first exhaust passage is connected to a first exhaust filter.

[0027] In one embodiment, the positron annihilation lifetime measurement system comprises an isolation plate, the isolation plate is embedded in a wall, an opening is provided on the isolation plate, and the opening penetrates the isolation plate along the first direction;

[0028] The shielding layer passes through the opening, and the first access opening is provided on one side of the shielding layer along the first direction. The side of the isolation plate along the first direction away from the first access opening is flush with the side of the shielding layer along the first direction away from the first access opening.

[0029] The positron annihilation lifetime measurement system in the present embodiment has a radiation source, an operating platform and a detector in an operating box, wherein the radiation source is arranged on the operating platform, and the staff places the sample to be tested on the operating platform, and the detector detects the positron annihilation lifetime emitted by the radiation source to the sample to be tested, so that the staff can judge the type of defects existing in the sample to be tested, and by arranging a shielding layer to cover the outer surface of the box assembly, when the positron annihilation lifetime measurement system detects the radioactive sample to be tested, the box assembly can be isolated from the external environment with the help of the shielding effect of the shielding layer, thereby preventing the radiation generated by the sample to be tested in the operating box from diffusing to the outside world, avoiding the body of the external staff from being irradiated by the radioactive sample, and finally achieving safe measurement of the radioactive sample. In summary, in the present embodiment, by arranging a shielding layer to cover the outer surface of the box assembly, the box assembly is isolated from the external environment, thereby avoiding the body of the external staff from being irradiated by the radioactive sample, and achieving safe measurement of the radioactive sample. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions in the embodiments or exemplary embodiments of the present application, the drawings required for use in the description of the embodiments or exemplary embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0031] Figure 1 It is a horizontal cross-sectional view of a positron annihilation lifetime measurement system in one embodiment of the present application.

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

[0033] Figure 3 for Figure 2 A locally enlarged schematic diagram of the positron annihilation lifetime measurement system at point A is shown.

[0034] Figure 4 for Figure 1 Main diagram of the positron annihilation lifetime measurement system shown.

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

[0036] Figure 6 for Figure 5 Top view of the positron annihilation lifetime measurement system shown.

[0037] Reference numerals:

[0038] Positron annihilation lifetime measurement system 1000;

[0039] Box assembly 1100, operating box 1110, radiation source 1111, operating platform 1112, detector 1113, starting gamma detector 1113-1, first stopping gamma detector 1113-2, second stopping 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 peep hole 1140, first peep window 1150, first peep 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, threading hole 1211, shielding sleeve 1212, shielding side plate 1220, first shielding member 1221, first shielding portion 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 peephole 1221-7-1, second shielding member 1222, third shielding part 1222-1, first access port 1222-1-1, first shielding door 1222-1-2, second hinge 1222-1-3, first card 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 opening 1222-3-1, second shielding door 1222-3-2, third hinge 1222-3-3, second clamping block 1222-3-4, second hook 1222-3-5, third shielding member 1223, fourth shielding member 1224, interface channel 1224-1, spare interface cover 1224-2, second spare interface 1224-3, shielding bottom plate 1230, second peep window 1240, peep glass member 124 1, first peep glass 1241-1, second peep glass 1241-2, third peep glass 1241-3, fourth peep glass 1241-4, peep glass mounting seat 1242, peep 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 cover 1242-2, second end cover 1242-3, fastener 1242-4;

[0041] A first air intake and exhaust assembly 1300, a first air intake filter 1310, a first air intake channel 1320, a first air intake valve 1330, a first exhaust channel 1340, a first exhaust valve 1350, a first exhaust filter 1360, and a first collection pipeline 1370;

[0042] A second air intake and exhaust assembly 1400, a second air intake filter 1410, a second air intake passage 1420, a second air intake valve 1430, a second exhaust passage 1440, a second exhaust valve 1450, a second exhaust filter 1460, and a second collection pipeline 1470;

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

[0044] Control assembly 1600, mounting arm 1610, display 1620, electrical integrated cabinet 1630;

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

[0046] Isolation plate 1800, opening 1810, first pressure gauge 1820, second pressure gauge 1830;

[0047] Support assembly 1900 , bracket 1910 , support 1920 . DETAILED DESCRIPTION

[0048] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0049] In the description of the present application, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0050] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, if the term "plurality" appears, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0051] In this application, unless otherwise clearly specified and limited, if the terms "installed", "connected", "connected", "fixed" and the like appear, these terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0052] In the present application, unless otherwise clearly specified and limited, if there is a description that a first feature is "above" or "below" a second feature, etc., or similar descriptions appear, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0053] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. If any, 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 implementation method.

[0054] See also Figures 1 to 3 , Figure 1A horizontal cross-sectional view of a positron annihilation lifetime measurement system in an embodiment of the present application is shown. A positron annihilation lifetime measurement system 1000 provided in an embodiment of the present application includes: a box assembly 1100 and a shielding layer 1200. The box assembly 1100 includes an operating box 1110. The operating box 1110 is provided with a radiation source 1111, an operating platform 1112, and a detector 1113. The radiation source 1111 is disposed on the operating platform 1112. The radiation source 1111 is used to emit positrons to a sample to be tested (not shown). The detector 1113 is disposed on the operating platform 1112 and is used to measure the positron annihilation lifetime. The shielding layer 1200 is coated on the outer surface of the box 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, and the first access port 1222-1-1 is connected to the inner cavity of the operating box 1110. The shielding layer 1200 is provided with a first shielding door 1222-1-2 at the position where the first access port 1222-1-1 is opened. The first shielding door 1222-1-2 is hinged to the shielding layer 1200, and the first shielding door 1222-1-2 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 the positron annihilation lifetime measurement system 1000 of the present embodiment, a radiation source 1111, an operation platform 1112 and a detector 1113 are arranged in an operation box 1110. The radiation source 1111 is arranged on the operation platform 1112. The staff places the sample to be tested on the operation platform 1112. The detector 1113 detects the positron annihilation lifetime emitted by the radiation source to the sample to be tested, so that the staff can judge the defect type existing in the sample to be tested. By setting a shielding layer 1200 to cover the outer surface of the box assembly 1100, the positron annihilation lifetime measurement system 1000 can detect the positron annihilation lifetime of the sample to be tested. When testing the radioactive sample to be tested, the shielding effect of the shielding layer 1200 can be used to isolate the box assembly 1100 from the external environment, thereby preventing the radiation generated by the sample to be tested in the operating box 1110 from diffusing to the outside, avoiding the body of the external staff from being irradiated by the radioactive sample, and finally achieving safe measurement of the radioactive sample. In summary, in this embodiment, the shielding layer 1200 is arranged to cover the outer surface of the box assembly 1100, so as to isolate the box assembly 1100 from the external environment, thereby avoiding the body of the external staff from being irradiated by the radioactive sample, and achieving safe measurement of the radioactive sample.

[0056] See also Figures 1 to 3In some embodiments, the box assembly 1100 includes a transition box 1120 and a connecting channel 1130. The transition box 1120 is spaced apart at one side of the operation box 1110. The connecting channel 1130 is disposed between the operation box 1110 and the transition box 1120. The inner cavity of the operation box 1110 is connected to the inner cavity of the transition box 1120 through the connecting channel 1130. A connecting door 1121 is provided in the transition box 1120. The connecting door 1121 is hinged to the cavity wall of the transition box 1120 and can rotate around the hinge point between itself and the transition box 1120 to To open or close the connecting channel 1130, a second access port 1222-3-1 is provided on the shielding layer 1200, and the second access port 1222-3-1 is communicated with the inner cavity of the transition box 1120. A second shielding door 1222-3-2 is provided at the position of the second access port 1222-3-1 of the shielding layer 1200, and the second shielding door 1222-3-2 is hinged to the shielding layer 1200. The second shielding door 1222-3-2 can rotate around the hinge point between itself and the shielding layer 1200 to close and open the second access port 1222-3-1.

[0057] In this embodiment, a transition box 1120 is arranged at an interval on one side of the operating box 1110, the inner cavity of the operating box 1110 is connected with the inner cavity of the transition box 1120 through a connecting channel 1130, and a connecting door 1121 is hinged to the cavity wall of the transition box 1120 to open or close the connecting channel 1130, and the second taking and releasing port 1222-3-1 is connected with the inner cavity of the transition box 1120, and the second shielding door 1222-3-2 is hinged to the shielding layer 1200 to close and open the second taking and releasing port 1222-3-1. The staff can open the second shielding door 1222-3-2, use mechanical equipment to place the lead can (not shown) containing the sample to be tested into the transition box 1120 through the second loading and unloading port 1222-3-1, and then close the second shielding door 1222-3-2 to take the sample to be tested out of the lead can. When the negative pressure in the transition box 1120 is the same as the negative pressure in the operation box 1110, open the connecting door 1121 and place the sample to be tested on the operating platform 1112 in the operation box 1110 through the connecting channel 1130. Finally, close the connecting door 1121 to complete the operation of the sample to be tested entering the operation box 1110. It can be seen from the above analysis that the setting of the transition box 1120 makes it possible for the operation box 1110 to not exchange air with the outside world during the process of placing the sample to be tested into the operation box 1110, thereby avoiding the radiation gas in the operation box 1110 from diffusing to the outside world and causing damage to the staff.

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

[0059] In some embodiments, the material of the transition box 1120 is 06Cr19Ni10 stainless steel, the wall thickness of the transition box 1120 on both sides opposite to each other along its own gravity direction is 30 mm, and the wall thickness of the other box walls reaches 5 mm. The inner surface polishing of the transition box 1120 is not less than Ra0.8μm, and the weld grinding and polishing roughness of the connection between any two adjacent box walls in the transition box 1120 is not less than Ra1.6μm.

[0060] In some embodiments, the transition box 1120 is spaced apart on one side of the operating box 1110 along the second direction, the connecting channel 1130 is disposed between the operating box 1110 and the transition box 1120 , and the inner cavity of the operating box 1110 is connected to the inner cavity of the transition box 1120 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 arranged on the side of the cavity wall of the transition box 1120 close to the operating 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 around the hinge point between itself and the first hinge 1121-2 to open or close the connecting channel 1130.

[0062] In some embodiments, a first protrusion 1121-3 is provided on the side of the connecting door body 1121-1 away from the first hinge 1121-2, and the first protrusion 1121-3 is matched with a first groove (not shown), and the first groove is arranged on the side of the cavity wall of the transition box 1120 close to the operation box 1110. The first protrusion 1121-3 is inserted into 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, the shielding side plate 1220 includes a first shielding member 1221 and a second shielding member 1222, the first shielding member 1221 includes a first shielding portion 1221-1, 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 disposed one by one on opposite sides of the operation box 1110 along the first direction.

[0064] In this embodiment, by providing the first shielding portion 1221-1 and the third shielding portion 1222-1, which are arranged one by one on opposite sides of the operation box 1110 along the first direction, the radiation generated by the sample to be tested in 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 material of the first shielding part 1221-1 is Q235-B carbon steel, the thickness of the first shielding part 1221-1 is 145mm, the material of the third shielding part 1222-1 is Q235-B carbon steel, the thickness of the third shielding part 1222-1 is 110mm, so as to meet the shielding requirements of 1Ci.

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

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

[0068] In some embodiments, the first access port 1222-1-1 is opened in the third shielding part 1222-1, and the first access port 1222-1-1 is connected to the inner cavity of the operation box 1110. The third shielding part 1222-1 is provided with a second hinge 1222-1-3, and the second hinge 1222-1-3 is located on one side of the first access 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 of 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 access port 1222-1-1.

[0069] In some embodiments, a first clamping block 1222-1-4 is provided on the side of the first shielding door 1222-1-2 away from the second hinge 1222-1-3 along the second direction, and a first hook 1222-1-5 is provided on the third shielding portion 1222-1. The first hook 1222-1-5 is located on the side of the first loading and unloading 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 clamping portion (not shown). The first hook 1222-1-5 is slidably connected to the third shielding portion 1222-1 and can move relative to the third shielding portion 1222-1 along the first direction to adjust the spacing between the first clamping portion and the third shielding portion 1222-1 in the first direction, so that the first clamping block 1222-1-4 is clamped into the gap between the first clamping portion and the third shielding portion 1222-1.

[0070] In some embodiments, the shielding layer 1200 includes a shielding cover plate 1210 and a shielding bottom plate 1230 , and the shielding cover plate 1210 and the shielding bottom plate 1230 are disposed one by one on two 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 bottom 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 plate 1210 is made of Q235-B carbon steel, the thickness of the shielding cover plate 1210 is 110 mm, the shielding bottom plate 1230 is made of Q235-B carbon steel, the thickness of the shielding bottom plate 1230 is 110 mm, so as to meet the shielding requirements of 1Ci.

[0073] In some embodiments, the shielding cover plate 1210 extends along the 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 bottom plate 1230 extends along the 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.

[0074] In some embodiments, the first shielding portion 1221 - 1 is connected to the shielding bottom plate 1230 along a side of the operating box 1110 that is away from the shielding cover plate 1210 in the gravity direction.

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

[0076] In some embodiments, the shielding layer 1200 includes a second shielding portion 1221-7, which is arranged on a side of the first shielding portion 1221-1 away from the shielding bottom 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 1210. The second shielding portion 1221-7 extends along the second direction from a side of the operating box 111 away from the transition box 1120 to a side of the transition box 1120 away from the operating box 1110. From the first shielding portion 1221-1 pointing to the shielding cover 1210, the distance between the second shielding portion 1221-7 and the third shielding portion 1222-1 in the first direction gradually decreases.

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

[0078] In some embodiments, the material of the second shielding portion 1221 - 7 is Q235-B carbon steel, and the thickness of the second shielding portion 1221 - 7 is 110 mm 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 a side of the transition box 1120 away from the first shielding portion 1221-1 along the first direction, and the fifth shielding portion 1222-3 extends along the second direction from a side of the operating box 1110 close to the transition box 1120 to a side of the transition box 1120 away from the operating box 1110.

[0080] In this embodiment, by setting 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 to be tested can be prevented from diffusing to the outside from the side of the transition box 1120 away from the first shielding part 1221-1 along the first direction.

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

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

[0083] In some embodiments, the second access port 1222-3-1 is arranged on the fifth shielding portion 1222-3, and the second access port 1222-3-1 is connected to the inner cavity of the transition box 1120. A third hinge 1222-3-3 is provided on one side of the second access port 1222-3-1 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 access port 1222-3-1.

[0084] In some embodiments, a second blocking block 1222-3-4 is provided on the side of the second shielding door 1222-3-2 away from the third hinge 1222-3-3 along the second direction, a second hook 1222-3-5 is provided on the fifth shielding portion 1222-3, the second hook 1222-3-5 is located on the side of the second taking and releasing port 1222-3-1 away from the third hinge 1222-3-3 along the second direction, the second hook 1222-3-5 has a second clamping portion (not shown), the second hook 1222-3-5 is slidably connected to the fifth shielding portion 1222-3, and can move relative to the fifth shielding portion 1222-3 along the first direction to adjust the spacing between the second clamping portion and the fifth shielding portion 1222-3 in the first direction, so that the second blocking block 1222-3-4 is clamped into the gap between the second clamping portion and the fifth shielding portion 1222-3.

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

[0086] In this embodiment, by disposing the fourth shielding portion 1222 - 2 on the side of the operating box 1110 close to the transition box 1120 , it is possible to prevent radiation generated by the sample to be tested from diffusing from the side of the operating box 1110 close to the transition box 1120 to the outside.

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

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

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

[0090] In this embodiment, by arranging the third shielding member 1223 on the side of the transition box 1120 away from the operating 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 operating box 1110 along the second direction, from the inside of the operating box 1110 and the transition box 1120 to the outside.

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

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

[0093] In some embodiments, the shielding layer 1200 includes a fourth shielding member 1224, which is disposed on a 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 portion 1221-1 on one side along the first direction, and is connected to the fifth shielding portion 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 is connected to the shielding bottom plate 1230 on the other side.

[0094] In this embodiment, by arranging 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 from the inside of the operating box 1110 and the transition box 1120 to the outside.

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

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

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

[0098] In this embodiment, by setting the first operation port 1221-2-1 to be connected with the inner cavity of the transition box 1120, the staff can wear shielding gloves and put their hands into the inner cavity of the transition box 1120 through the first operation port 1221-2-1, and then open the lead tank containing the sample to be tested and take the sample to be tested out of the lead tank; by setting a plurality of first operation ports 1221-2-1 to be arranged at intervals along the arrangement direction of the operation box 1110 and the transition box 1120, the staff can put their hands into the inner cavity of the transition box 1120 through the plurality of first operation ports 1221-2-1 in turn along the direction from the transition box 1120 to the operation box 1110, so as to move the sample to be tested along the direction between the operation box 1110 and the transition box 1120. 20 is arranged in an arrangement direction, close to the operation box 1110, so that it is convenient 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 arranging a first operating door 1221-3 hingedly connected at the position corresponding to each first operating port 1221-2-1 on the shielding layer 1200, each first operating door 1221-3 can rotate around its own hinge point with the shielding layer 1200 to open and close the corresponding first operating port 1221-2-1, so that when the staff does not move the sample to be tested, the first operating port 1221-2-1 is isolated from the outside world, thereby preventing the radiation generated by the sample to be tested from the first operating port 1221-2-1 and spreading from the transition box 1120 to the outside world.

[0099] In some embodiments, the first shielding portion 1221-1 is provided with a first operating channel 1221-2, and the first operating channel 1221-2 includes a plurality of first operating ports 1221-2-1. The plurality of first operating ports 1221-2-1 are arranged at intervals along the arrangement direction of the operating box 1110 and the transition box 1120, and each first operating port 1221-2-1 is connected to the inner cavity of the transition box 1120. A first operating door 1221-3 is hinged at the position corresponding to each first operating port 1221-2-1 on the first shielding portion 1221-1, and each first operating door 1221-3 can rotate around the hinge point between itself and the first shielding portion 1221-1 to open and close the corresponding first operating port 1221-2-1.

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

[0101] In this embodiment, by setting the second operation port 1221-4-1 to be connected with the inner cavity of the operation box 1110, the staff can wear shielding gloves and put their hands into the inner cavity of the operation box 1110 through the second operation port 1221-4-1 to move the position of the sample to be tested in the operation box 1110; by setting a plurality of second operation ports 1221-4-1 to be arranged at intervals along the arrangement direction of the operation box 1110 and the transition box 1120, the staff can sequentially put their hands into the inner cavity of the operation box 1110 through the plurality of second operation ports 1221-4-1 in the direction from the transition box 1120 to the operation box 1110 to move the sample to be tested toward the operation platform 1112. in the direction of rotation until the sample to be tested is placed on the operating platform 1112; a second operating door 1221-5 is hingedly connected to each second operating port 1221-4-1 on the shielding layer 1200, and each second operating door 1221-5 can rotate around its own hinge point with the shielding layer 1200 to open and close the corresponding second operating port 1221-4-1, so that when the staff's hand withdraws from the inner cavity of the operating box 1110 from the second operating port 1221-4-1, the first operating port 1221-2-1 is isolated from the outside world, thereby preventing the radiation generated by the sample to be tested from the second operating port 1221-4-1 and spreading from the operating box 1110 to the outside world.

[0102] In some embodiments, a second operating channel 1221-4 is provided on the first shielding portion 1221-1, and the second operating channel 1221-4 and the first operating channel 1221-2 are spaced apart along the arrangement direction of the operating box 1110 and the transition box 1120. The second operating channel 1221-4 includes a plurality of second operating ports 1221-4-1, and the plurality of second operating ports 1221-4-1 are spaced apart along the arrangement direction of the operating box 1110 and the transition box 1120, and each second operating port 1221-4-1 is connected to the inner cavity of the operating box 1110, and a second operating door 1221-5 is hinged at the position corresponding to each second operating port 1221-4-1 on the first shielding portion 1221-1, and each second operating door 1221-5 can rotate around the hinge point between itself and the first shielding portion 1221-1 to open and close the corresponding second operating port 1221-4-1.

[0103] See also Figures 1 to 3 In some embodiments, the positron annihilation lifetime measurement system 1000 includes an operating glove 1221-6, and an operating glove 1221-6 is inserted into 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 with the outer surface of the corresponding operating glove 1221-6, and the inner wall of each second operating port 1221-4-1 is sealed with the outer surface of the corresponding operating glove 1221-6.

[0104] In this embodiment, by setting the inner wall of each first operation port 1221-2-1 to be sealed with the outer surface of the corresponding operation glove 1221-6, the radiation generated by the sample to be tested can be prevented from leaking to the outside through the gap between the inner wall of the first operation port 1221-2-1 and the outer surface of the corresponding operation glove 1221-6; by setting the inner wall of each second operation port 1221-4-1 to be sealed with the outer surface of the corresponding operation glove 1221-6, the radiation generated by the sample to be tested can be prevented from leaking to the outside through the gap between the inner wall of the second operation port 1221-4-1 and the outer surface of the corresponding operation glove 1221-6.

[0105] In some embodiments, the first operating port 1221-2-1 includes a first operating hole segment (not shown) and a second operating hole segment (not shown) that are coaxially arranged and interconnected. The first operating hole segment passes through the first shielding portion 1221-1, and the second operating hole segment passes through the box wall of the transition box 1120. The aperture of the first operating hole segment is larger than the aperture of the second operating hole segment. The inner wall of the second operating hole segment of the first operating port 1221-2-1 is sealed and matched with 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 segment (not shown) and a fourth operating hole segment (not shown) that are coaxially arranged and interconnected. The third operating hole segment penetrates the first shielding portion 1221-1, and the fourth operating hole segment penetrates the box wall of the operating box 1110. The aperture of the third operating hole segment is larger than the aperture of the fourth operating hole segment. The inner wall of the third operating hole segment of the second operating port 1221-4-1 is sealed with the outer surface of the corresponding operating glove 1221-6.

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

[0108] In this embodiment, by coating 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 damage to the human body, thereby ensuring the safety of the operator.

[0109] It should be noted that the above-mentioned 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, 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, and the thickness of the operating glove 1221-6 is 0.8 mm.

[0111] See also Figures 1 to 3 In some embodiments, a plurality of first peep ports 1140 are provided on one side of the box assembly 1100, and the plurality of first peep ports 1140 are arranged at intervals along the arrangement direction of the operation box 1110 and the transition box 1120. Among the plurality of first peep ports 1140, a part of the first peep ports 1140 are communicated with the inner cavity of the transition box 1120, and another part of the first peep ports 1140 are communicated with the inner cavity of the operation box 1110, and a first peep window 1150 is embedded in each first peep port 1140. A plurality of second peep ports 1221-7-1 are provided on the shielding layer 1200, and the plurality of second peep ports 1221-7-1 are arranged one-to-one corresponding to the plurality of first peep ports 1140, and each second peep port 1221-7-1 is communicated with the corresponding first peep port 1140, and a second peep window 1240 is embedded in each second peep port 1221-7-1.

[0112] In this embodiment, the staff can observe the position of the sample to be tested in the inner cavity of the transition box 1120 through the first peep hole 1140 connected to the inner cavity of the transition box 1120; by embedding the first peep window 1150 in the first peep hole 1140 connected to the inner cavity of the transition box 1120, the staff can observe the position of the sample to be tested in the transition box 1120 through the first peep window 1150, and prevent the radiation generated by the sample to be tested from diffusing from the inner cavity of the transition box 1120 to the outside through the first peep hole 1140; by arranging a first peep window 1150 connected to the inner cavity of the transition box 1120 on the shielding layer 1200, the staff can observe the position of the sample to be tested in the transition box 1120 through the first peep window 1150. The second peep port 1221-7-1 corresponding to the opening 1140 is convenient for the staff to observe the position of the sample to be tested in the transition box 1120 through the second peep port 1221-7-1 and the first peep window 1150; by embedding the second peep window 1240 in the second peep port 1221-7-1, the radiation generated by the sample to be tested is isolated from the outside world, and it is convenient for the staff to observe the position of the sample to be tested in the transition box 1120 through the second peep window 1240 and the first peep window 1150 embedded in the first peep port 1140 connected to the inner cavity of the transition box 1120.

[0113] The staff can observe the position of the sample to be tested in the inner cavity of the operation box 1110 through the first peep hole 1140 connected to the inner cavity of the operation box 1110; by embedding the first peep window 1150 in the first peep hole 1140 connected to the inner cavity of the operation box 1110, the staff can observe the position of the sample to be tested in the operation box 1110 through the first peep window 1150, and prevent the radiation generated by the sample to be tested from diffusing from the inner cavity of the operation box 1110 to the outside through the first peep hole 1140; by arranging a first peep window 1150 connected to the first peep hole 1140 on the shielding layer 1200 0 corresponding to the second peep port 1221-7-1, so that the staff can observe the position of the sample to be tested in the operation box 1110 through the second peep port 1221-7-1 and the first peep window 1150; by embedding the second peep window 1240 in the second peep port 1221-7-1, the radiation generated by the sample to be tested is isolated from the outside world, and it is convenient for the staff to observe the position of the sample to be tested in the operation box 1110 through the second peep window 1240 and the first peep window 1150 embedded in the first peep port 1140 connected to the inner cavity of the operation box 1110.

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

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

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

[0117] In some embodiments, the first viewing glass plate 1151 is PC glass with a thickness greater than or equal to 12 mm.

[0118] In some embodiments, the first peep window 1150 includes a first pressure cover 1153, the first pressure 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 arranged around the periphery of the first mounting flange 1152, and is arranged on the side of the box assembly 1100 close to the shielding layer 1200, the first pressure plate 1153-2 is arranged on the side of the first baffle 1153-1 away from the box assembly 1100, and is arranged around the periphery of the first peep glass plate 1151, the first pressure plate 1153-2 is provided with a 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 to the side of the box assembly 1100 close to the shielding layer 1200.

[0119] In this embodiment, a clamping force is applied to the first mounting flange 1152 by the first fastener 1153-3 to press the first mounting flange 1152 against the side of the box assembly 1100 close to the shielding layer 1200, thereby fixing the first peek glass plate 1151. The structure is simple and the installation of the first peek glass plate 1151 is convenient.

[0120] In some embodiments, the first peep window 1150 includes a first sealant, which is disposed between the outer circumference of the first peep glass plate 1151 and the inner wall of the first mounting flange 1152 .

[0121] In some embodiments, the second peep window 1240 includes a peep glass piece 1241 and a peep glass mounting seat 1242 . The peep glass mounting seat 1242 is embedded in the second peep port 1221 - 7 - 1 , and the peep glass piece 1241 is embedded in the peep glass mounting seat 1242 .

[0122] In some embodiments, the peep glass mounting seat 1242 includes a peep glass mounting hole 1242-1, the peep glass mounting hole 1242-1 includes a first mounting hole section 1242-1-1, the first mounting hole section 1242-1-1 is arranged on a side of the peep glass mounting seat 1242 close to the operating box 1110, and the peep glass component 1241 includes a first peep glass 1241-1, and the first peep glass 1241-1 is passed through the first mounting hole section 1242-1-1.

[0123] In some embodiments, the first peep glass 1241 - 1 is ZF6 lead glass with a thickness greater than or equal to 60 mm.

[0124] In some embodiments, the peep glass mounting hole 1242-1 includes a third mounting hole section 1242-1-3, the third mounting hole section 1242-1-3 is arranged on the side of the peep glass mounting seat 1242 away from the operating box 1110, the third mounting hole section 1242-1-3 is coaxially arranged with the first mounting hole section 1242-1-1, and are interconnected, the peep glass component 1241 includes a third peep glass 1241-3, and the third peep glass 1241-3 is passed through the third mounting hole section 1242-1-3.

[0125] In some embodiments, the third peep glass 1241 - 3 is ZF6 lead glass with a thickness greater than or equal to 60 mm.

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

[0127] In some embodiments, the second peep glass 1241 - 2 is ZF6 lead glass with a thickness greater than or equal to 60 mm.

[0128] In some embodiments, the peep glass mounting seat 1242 includes a first end cover 1242-2, and the first end cover 1242-2 is covered on the outer side of the first mounting hole section 1242-1-1 and contacts the side of the first peep glass 1241-1 away from the second peep glass 1241-2 to prevent the first peep glass 1241-1 from falling from the first mounting hole section 1242-1-1. A first end cover hole (not shown) is provided on the first end cover 1242-2. Along the central axis direction of the first mounting hole section 1242-1-1, the outer contour line of the projection of the first peep glass 1241-1 on the second peep glass 1241-2 surrounds the outer contour line of the projection of the first end cover hole on the second peep glass 1241-2.

[0129] In some embodiments, the peep glass mounting seat 1242 includes a second end cover 1242-3, which is disposed on the outer side of the third mounting hole section 1242-1-3 and contacts the side of the third peep glass 1241-3 away from the second peep glass 1241-2 to prevent the third peep glass 1241-3 from falling from the third mounting hole section 1242-1-3. The second end cover 1242-3 is provided with a receiving groove on one side of the third mounting hole section 1242-1-3 (not shown). The fourth peep glass 1241-4 is included, and the fourth peep glass 1241-4 is arranged in the accommodating groove. The second end cover 1242-3 is provided with a second end cover hole (not shown) on the side away from the third mounting hole section 1242-1-3. The second end cover hole is connected to the accommodating groove. Along the central axis direction of the third mounting hole section 1242-1-3, the outer contour line of the projection of the fourth peep glass 1241-4 on the second peep glass 1241-2 surrounds the outer contour line of the projection of the second end cover hole on the second peep glass 1241-2.

[0130] In some embodiments, the fourth peep glass 1241 - 4 is a tempered glass with a thickness greater than or equal to 5 mm.

[0131] In some embodiments, in the direction of the central axis of the first mounting hole section 1242-1-1, the outer contour line of the projection of the third mounting hole section 1242-1-3 on the second end cover 1242-3 surrounds the outer side of the outer contour line of the projection of the fourth peep glass 1241-4 on the second end cover 1242-3; the outer contour line of the projection of the second mounting hole section 1242-1-2 on the second end cover 1242-3 surrounds the outer side of the outer contour line of the projection of the third mounting hole section 1242-1-3 on the second end cover 1242-3; the outer contour line of the projection of the first mounting hole section 1242-1-1 on the second end cover 1242-3 surrounds the outer side of the outer contour line of the projection of the second mounting hole section 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 outer side of the first mounting hole section 1242 - 1 - 1 , and the fastener 1242 - 4 is used to mount the peep glass mounting base 1242 on the second shielding portion 1221 - 7 .

[0133] See also Figures 1 to 3In some embodiments, the detector 1113 includes a start gamma detector 1113-1, a first stop gamma detector 1113-2 and a second stop gamma detector 1113-3. The start gamma detector 1113-1 is arranged on one side of the operating platform 1112 along the first direction. The start gamma detector 1113-1 is used to detect the gamma rays cascaded when the radiation source 1111 emits positrons. The first stop gamma detector 1113-2 and the second stop gamma detector 1113-3 are arranged one by one on both sides of the operating platform 1112 along the second direction. The gravity direction, the first direction and the second direction of the operating box 1110 are perpendicular to each other. The first stop gamma detector 1113-2 and the second stop gamma detector 1113-3 are used to detect two annihilation gamma rays emitted in opposite directions after the annihilation of the positrons.

[0134] In this embodiment, since the positrons generated by the radiation source 1111 are isotropically emitted toward the inner cavity of the operation box 1110, a part of the positrons enter the sample to be tested and are annihilated, and another part of the positrons do not enter the sample to be tested or penetrate the sample to be tested, and finally are annihilated in the box wall of the operation box 1110. After the positrons are annihilated in the material of the sample to be tested and the box wall material of the operation box 1110, annihilation gamma photons will be generated. It is necessary to eliminate the influence of the positron annihilation case in the box wall material of the operation box 1110 on the measurement. By setting the first stop gamma detector 1113-2 and the second stop gamma detector 1113-3, which are set one by one in the operation box 1110, On both sides of the working platform 1112 along the second direction, since the two annihilation gamma rays generated by the annihilation of the positrons in the box 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-mentioned setting can simultaneously detect the two reversely emitted annihilation gamma rays generated after the positron annihilation, eliminate the positron annihilation cases in the samples not to be tested, screen out the positron annihilation cases in the samples to be tested, reduce the interference of the positron annihilation cases in the samples not to be tested on the detection results, and improve the detection accuracy of the positron annihilation lifetime measurement system 1000 for the samples to be tested.

[0135] In some embodiments, the starting gamma detector 1113-1 is responsible for 22 The 1.28 MeV gamma rays generated by the cascade when the Na radiation source emits positrons are detected, and the first stop gamma detector 1113-2 and the second stop gamma detector 1113-3 respectively detect the two reversely emitted 0.511 MeV annihilation gamma rays generated after the positron annihilation.

[0136] See also Figures 4 to 6In some embodiments, the positron annihilation lifetime measurement system 1000 includes a first air intake and exhaust assembly 1300, which includes a first air intake channel 1320 and a first exhaust channel 1340, one end of the first air intake channel 1320 is connected to the inner cavity of the operating box 1110, one end of the first exhaust channel 1340 is connected to the inner cavity of the operating box 1110, and 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 inlet channel 1320 to be connected to the inner cavity of the operation box 1110, dry and pure gas can be transmitted to the inner cavity of the operation box 1110, and by setting one end of the first exhaust channel 1340 to be connected to the inner cavity of the operation box 1110, and the other end is connected to the first exhaust filter 1360, so that the radiated gas in the inner cavity of the operation box 1110 can leave the operation box 1110 through the first exhaust channel 1340, and be discharged to a subsequent pipeline (not shown) after being filtered by the first exhaust filter 1360.

[0138] In some embodiments, the first air 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 in the gas.

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

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

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

[0143] In some embodiments, the first air 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 filtering 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 air inlet and exhaust assembly 1400, which includes a second air inlet channel 1420, a second exhaust channel 1440 and a second exhaust filter 1460, one end of the second air inlet channel 1420 is connected to the inner cavity of the transition box 1120, one end of the second air inlet channel 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 air intake and exhaust assembly 1400 is disposed on the shielding cover 1210 .

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

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

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

[0149] In some embodiments, the second air intake and exhaust assembly 1400 includes a second collection pipe 1470, which is connected to the exhaust port of the second exhaust filter 1460 and is used to collect gas filtered by the second exhaust filter 1460, so that the staff can judge the filtering 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 a lighting assembly 1500, and the lighting assembly 1500 includes a first lighting lamp 1510 and a second lighting lamp 1520. The first lighting lamp 1510 is disposed on the shielding cover 1210, and is used to emit light to the inner cavity of the operating box 1110 to illuminate the inner cavity of the operating box 1110; the second lighting lamp 1520 is disposed on the shielding cover 1210, and is used to emit light to 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, the support assembly 1900 includes a bracket 1910 and a support 1920, the bracket 1910 is arranged on the side of the shielding base plate 1230 away from the shielding cover plate 1210, and a plurality of supports 1920 are arranged at intervals 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 gravity direction of the operating box 1110.

[0152] See also 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). An opening 1810 is provided on the isolation plate 1800, and the opening 1810 penetrates the isolation plate 1800 along a first direction. The shielding layer 1200 is passed through the opening 1810. A first access port 1222-1-1 is provided on one side of the shielding layer 1200 along the first direction. A side of the isolation plate 1800 away from the first access port 1222-1-1 along the first direction is flush with a side of the shielding layer 1200 away from the first access port 1222-1-1 along the first direction.

[0153] In this embodiment, an isolation plate 1800 is embedded in the wall, an opening 1810 is provided on the isolation plate 1800, the shielding layer 1200 is passed through the opening 1810, and a first access port 1222-1-1 is provided on one side of the shielding layer 1200 along the first direction. The side of the isolation plate 1800 away from the first access port 1222-1-1 along the first direction is flush with the side of the shielding layer 1200 away from the first access port 1222-1-1 along the first direction, so that the box assembly 1100 of the positron annihilation lifetime measurement system 1000 can be placed in the space enclosed by the wall, thereby better isolating the radiation generated by the sample to be tested from the external environment, preventing the radiation generated by the sample to be tested from diffusing to the outside world 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 a side of the isolation plate 1800 away from the third shielding portion 1222-1 along the first direction. The display 1620 is electrically connected to the first lighting lamp 1510 and the second lighting lamp 1520 for controlling the lighting and extinguishing of the first lighting lamp 1510 and the second lighting 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. One end of the mounting arm 1610 is connected to the display 1620, and the other end is connected to the isolation plate 1800.

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

[0156] In some embodiments, the positron annihilation lifetime measurement system 1000 includes an image acquisition component 1700, and the image acquisition component 1700 includes a first camera 1710 and a second camera 1720. A plurality of first cameras 1710 are arranged in the operating box 1110 to photograph the various devices in the operating box 1110 in an all-round and blind-angle manner. Each first camera 1710 is electrically connected to the display 1620 through an electrical integrated cabinet 1630, and the photographed information is transmitted to the display 1620 for display; a plurality of second cameras 1720 are arranged in the transition box 1120 to photograph the various devices in the transition box 1120 in an all-round and blind-angle manner. Each second camera 1720 is electrically connected to the display 1620 through an electrical integrated cabinet 1630, and the photographed information is transmitted to the display 1620 for display.

[0157] In some embodiments, the positron annihilation lifetime measurement system 1000 includes a first air pressure sensor (not shown) and a second air pressure sensor (not shown). The first air pressure sensor is arranged in the inner cavity of the operating box 1110, and is used to detect the pressure inside the operating box 1110. The second air pressure sensor is arranged 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 air pressure sensor, and is used to display the data detected by the first air pressure sensor. The second pressure gauge 1830 is electrically connected to the second air pressure sensor, and is used to display the data detected by the second air pressure sensor.

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

[0159] In some embodiments, a plurality of first spare interfaces 1222 - 1 - 6 are provided on the third shielding portion 1222 - 1 , and each first spare interface 1222 - 1 - 6 is used to plug in wires electrically connected to devices in the operation box 1110 and the transition box 1120 .

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

[0161] In some embodiments, an interface channel 1224-1 is provided on the fourth shielding member 1224, and a spare interface cover 1224-2 is passed through the interface channel 1224-1. The spare interface cover 1224-2 isolates the interface channel 1224-1 from the outside world. A plurality of second spare interfaces 1224-3 are provided on the spare interface cover 1224-2, and each second spare interface 1224-3 is used to plug in wires electrically connected to the equipment in the operating box 1110 and the transition box 1120.

[0162] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described 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 above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. A positron annihilation lifetime measurement system, characterized in that: The positron annihilation lifetime measurement system comprises: A box assembly includes an operating box, wherein a radiation source, an operating platform and a detector are arranged in the operating box, wherein the radiation source is arranged on the operating platform and is used to emit positrons to a sample to be tested, and the detector is arranged on the operating platform and is used to measure the positron annihilation lifetime; A shielding layer is coated on the outer surface of the box assembly to shield the radiation generated by the radiation source. The shielding layer is provided with a first access port, the first access port is communicated with the inner cavity of the operation box, and a first shielding door is provided at the position where the first access port is opened on the shielding layer. The first shielding door is hinged to the shielding layer, and the first shielding door can rotate around the hinge point between itself and the shielding layer to close and open the first access port.

2. The positron annihilation lifetime measurement system according to claim 1, characterized in that: The box assembly includes a transition box and a connecting channel, wherein the transition box is arranged at a distance on one side of the operation box, and the connecting channel is arranged between the operation box and the transition box, and the inner cavity of the operation box is connected with the inner cavity of the transition box through the connecting channel; A connecting door is provided in the transition box, the connecting door is hinged to the cavity wall of the transition box, and can rotate around the hinge point between the connecting door and the transition box to open or close the connecting passage; The shielding layer is provided with a second access port, the second access port is communicated with the inner cavity of the transition box, and the shielding layer is provided with a second shielding door at the position of the second access port. The second shielding door is hinged to the shielding layer, and the second shielding door can rotate around the hinge point between itself and the shielding layer to close and open the second access port.

3. The positron annihilation lifetime measurement system according to claim 2, 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, which are arranged at intervals along the arrangement direction of the operation box and the transition box, and each of the first operation ports is communicated with the inner cavity of the transition box; A first operating door is hingedly connected to the shielding layer at a position corresponding to each of the first operating openings, and each of the first operating doors can rotate around a hinge point between itself and the shielding layer to open and close the corresponding first operating opening.

4. The positron annihilation lifetime measurement system according to claim 3, characterized in that: A second operating channel is provided on the shielding layer, and the second operating channel and the first operating channel are arranged at intervals 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 arranged at intervals along the arrangement direction of the operation box and the transition box, and each of the second operation ports is communicated with the inner cavity of the operation box; A second operating door is hingedly connected to the shielding layer at a position corresponding to each second operating port, and each second operating door can rotate around a hinge point between itself and the shielding layer to open and close the corresponding second operating port.

5. The positron annihilation lifetime measurement system according to claim 4, characterized in that: The positron annihilation lifetime measurement system comprises an operating glove, wherein each of the first operating openings and each of the second operating openings is provided with the operating glove; The inner wall of each of the first operating ports is in sealing cooperation with the outer surface of the corresponding operating glove, and the inner wall of each of the second operating ports is in sealing cooperation with the outer surface of the corresponding operating glove.

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

7. The positron annihilation lifetime measurement system according to claim 5, characterized in that: A plurality of first peep holes are provided on one side of the box assembly, and the plurality of first peep holes are arranged at intervals along the arrangement direction of the operation box and the transition box; Among the plurality of first peep holes, a part of the first peep holes are communicated with the inner cavity of the transition box, and another part of the first peep holes are communicated with the inner cavity of the operation box, and a first peep window is embedded in each of the first peep holes; The shielding layer is provided with a plurality of second peep ports, which are arranged one-to-one with the plurality of first peep ports, each of the second peep ports is connected with the corresponding first peep port, and each of the second peep ports is embedded with a second peep window.

8. The positron annihilation lifetime measurement system according to any one of claims 1 to 7, characterized in that: The detectors include a start gamma detector, a first stop gamma detector, and a second stop gamma detector; The initial gamma detector is arranged on one side of the operating platform along the first direction, and is used to detect gamma rays generated by the cascade when the radiation source emits positrons; The first stop gamma detector and the second stop gamma detector are arranged one by one 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 stop gamma detector and the second stop gamma detector are used to detect two reversely emitted annihilation gamma rays generated after positron annihilation.

9. The positron annihilation lifetime measurement system according to claim 8, characterized in that: The positron annihilation lifetime measurement system comprises a first air intake and exhaust assembly, wherein the first air intake and exhaust assembly comprises a first air intake channel and a first exhaust channel; One end of the first air inlet passage is in communication with the inner cavity of the operation box, one end of the first exhaust passage is in communication with the inner cavity of the operation box, and the other end of the first exhaust passage is connected to a first exhaust filter.

10. The positron annihilation lifetime measurement system according to claim 8, characterized in that: The positron annihilation lifetime measurement system comprises an isolation plate, the isolation plate is embedded in the wall, an opening is provided on the isolation plate, and the opening passes through the isolation plate along the first direction; The shielding layer passes through the opening, and the first access opening is provided on one side of the shielding layer along the first direction. The side of the isolation plate along the first direction away from the first access opening is flush with the side of the shielding layer along the first direction away from the first access opening.

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