Cosmic ray shielding cabin

Abstract

The embodiment of the invention provides a cosmic ray shielding cabin which comprises a plurality of shielding walls, a shielding space is defined by the shielding walls, and each shielding wall sequentially comprises a first polyethylene layer, a first copper layer, a first lead layer and a first carbon steel layer in the direction away from the shielding space. According to the cosmic ray shielding cabin provided by the embodiment of the invention, the composition material does not block hard components in cosmic rays, so that the outer contour size of the shielding wall can be reduced; soft components in cosmic rays and gamma radiation in the surrounding environment are shielded, background counting of a radiation measuring instrument in radiation measurement operation caused by the cosmic rays and secondary particles can be reduced, and the measurement precision can be improved; the first polyethylene layer, the first copper layer, the first lead layer and the first carbon steel layer are sequentially arranged from inside to outside, so that derivative secondary rays generated by reaction of a previous layer of material can be gradually absorbed from inside to outside, and interference on radiation measurement operation in a shielding space is reduced.

Description

Technical Field

[0001] The present application relates to the field of shielding technology, and in particular to a cosmic ray shielding cabin. Background Art

[0002] In the process of measuring trace radionuclides retained in the human body, background radiation will have a great impact on the low-energy gamma and X-ray energy peaks in the measured energy spectrum, which can easily lead to distortion of the measurement results. The background radiation count mainly comes from cosmic rays and secondary rays generated by the interaction between cosmic rays and matter in the environment.

[0003] In the related art, during the measurement process, the person being measured is placed in a shielding cabin made of a single stainless steel or carbon steel material to shield the high-energy gamma rays from the outside world and improve the accuracy of the measurement results of radionuclides emitting higher gamma energy in the human body. However, since this type of shielding cabin has a poor shielding effect on low-energy gamma rays, the measurement results of radionuclides emitting gamma energy less than 50keV (Kiloelectron volt) in the human body, such as transuranic nuclides such as Am-241 and Pu-239, have large errors. Summary of the invention

[0004] In view of this, the embodiments of the present application hope to provide a cosmic ray shielding cabin that reduces the adverse effects of cosmic rays on measuring trace radionuclides retained in the human body.

[0005] To achieve the above purpose, the technical solution of the embodiment of the present application is implemented as follows:

[0006] An embodiment of the present application provides a cosmic ray shielding cabin, which includes a plurality of shielding walls, which are arranged to form a shielding space, and the shielding walls include a first polyethylene layer, a first copper layer, a first lead layer and a first carbon steel layer in sequence along a direction away from the shielding space.

[0007] In some embodiments, along the direction away from the shielding space, the thickness of the first carbon steel layer ranges from 100 mm to 200 mm; and / or the thickness of the first lead layer ranges from 5 mm to 15 mm.

[0008] In some embodiments, along a direction away from the shielding space, the thickness of the first copper layer ranges from 5 mm to 10 mm; and / or the thickness of the first polyethylene layer ranges from 2 mm to 10 mm.

[0009] In some embodiments, a plurality of the shielding walls are spliced ​​with each other, and the peripheral edges of the shielding walls are stepped surfaces, and the stepped surfaces of two adjacent shielding walls are in contact with each other.

[0010] In some embodiments, at least part of the shielding wall is a first shell, the first shell also includes a support frame, the support frame includes a support assembly and a fixing member, the support assembly is clamped between the first polyethylene layer and the first copper layer, and the fixing member connects the support assembly and the first carbon steel layer.

[0011] In some embodiments, the support assembly includes a first support member and a second support member, the first support member extends along a first direction, the second support member extends along a second direction, the thickness direction of the shielding wall, the first direction and the second direction are perpendicular to each other, the first support member is connected to the second support member and at least one of the two is in contact with the inner wall of the first copper layer, and at least one of the first support member and the second support member is connected to the fixing member.

[0012] In some embodiments, the shielding wall includes a top shell, the top shell is located on the top side of the cosmic ray shielding cabin in the vertical direction, and the first shell forms the top shell;

[0013] And / or, the shielding wall includes a side shell, the side shell is located on at least one side of the cosmic ray shielding cabin along the horizontal direction, and the first shell forms the side shell.

[0014] In some embodiments, part of the shielding wall is a side shell, which is located on one side of the cosmic ray shielding cabin in the horizontal direction, and the side shell is provided with a first channel, which passes through the side shell and is connected to the shielding space, and the cosmic ray shielding cabin also includes a shield, which covers the opening of the first channel away from one end of the shielding space and is surrounded by the side shell to form a second channel, which connects the first channel with the outside of the cosmic ray shielding cabin, and the opening of the second channel connecting the outside of the cosmic ray shielding cabin is located below the second channel in the vertical direction.

[0015] In some embodiments, the first channel extends in a horizontal direction, the second channel extends in a vertical direction, and an opening of the second channel connected to the outside of the cosmic ray shielding cabin is lower than an opening of the first channel for connecting to the second channel.

[0016] In some embodiments, the shield includes a plurality of protective walls, which are spliced ​​with each other and surrounded by the side shell to form the second channel, and the shielding wall includes a second polyethylene layer, a second copper layer, a second lead layer and a second carbon steel layer in sequence along the direction away from the second channel.

[0017] In some embodiments, along a direction away from the second channel, the thickness of the second carbon steel layer ranges from 100 mm to 200 mm; and / or the thickness of the second lead layer ranges from 5 mm to 15 mm.

[0018] In some embodiments, along a direction away from the second channel, the thickness of the second copper layer ranges from 5 mm to 10 mm; and / or the thickness of the second polyethylene layer ranges from 2 mm to 10 mm.

[0019] In some embodiments, a positioning groove is provided on the outer surface of the side shell, and the positioning groove surrounds at least a portion of the peripheral edge of the opening of the first channel away from one end of the shielding space, and a portion of the shield is embedded in the positioning groove.

[0020] In some embodiments, the shielding wall includes a mounting shell and at least one door body, wherein the door body is located on one side of the cosmic ray shielding cabin along the horizontal direction, and the door body and the mounting shell can be movably configured to open or close the shielding space.

[0021] The cosmic ray shielding cabin in the embodiment of the present application is composed of materials that do not block the hard components in cosmic rays, which is beneficial to reducing the outer contour size of the shielding wall; it shields the soft components in cosmic rays and the gamma radiation of the surrounding environment, which is beneficial to reducing the background count of the radiation measuring instrument in the radiation measurement operation caused by cosmic rays and secondary particles, and is beneficial to improving the measurement accuracy; by arranging the first polyethylene layer, the first copper layer, the first lead layer and the first carbon steel layer in sequence from the inside to the outside, it can gradually absorb the derived secondary rays generated by the reaction of the previous layer of material from the inside to the outside, thereby further reducing the interference with the radiation measurement operation in the shielding space. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of a cosmic ray shielding cabin in a closed state in one embodiment of the present application;

[0023] Figure 2 for Figure 1 Schematic diagram of the cosmic ray shield in the open state;

[0024] Figure 3 for Figure 2 Schematic diagram of the section at the AA position;

[0025] Figure 4 for Figure 3 A partial enlarged schematic diagram of position B in the middle;

[0026] Figure 5 is a schematic diagram of a support assembly in an embodiment of the present application;

[0027] Figure 6 for Figure 2 A schematic diagram of the cosmic ray shield in another perspective;

[0028] Figure 7 for Figure 2 A partial cutaway schematic diagram of the cosmic ray shielding cabin in FIG.

[0029] Figure 8 for Figure 7 A partial enlarged schematic diagram of the C position in the middle.

[0030] Description of Reference Numerals

[0031] 10. Shielding wall; 10a. Shielding space; 11. First polyethylene layer; 12. First copper layer; 13. First lead layer; 14. First carbon steel layer; 15. Top shell; 16. Side shell; 16a. First channel; 16b. Positioning groove; 17. Mounting shell; 18. Door body; 19. Support frame; 191. Support assembly; 1911. First support member; 1912. Second support member; 192. Fixing member; 20. Protective cover; 20a. Second channel; 21. Second polyethylene layer; 22. Second copper layer; 23. Second lead layer; 24. Second carbon steel layer; 30. Drive assembly; 31. Motor assembly; 32. First connecting rod; 33. Second connecting rod. DETAILED DESCRIPTION

[0032] It should be noted that, in the absence of conflict, the embodiments and technical features in the embodiments of the present application can be combined with each other, and the detailed description in the specific implementation method should be understood as an explanation of the purpose of the present application and should not be regarded as an improper limitation on the present application.

[0033] In the description of this application, the "vertical direction" orientation or position relationship is based on the attached Figure 1 and Figure 3 The direction of the arrow X shown; the "horizontal direction" direction or position relationship is based on the attached Figure 2 , Figure 3 and Figure 7 The direction of the arrow Y shown; the "first direction" direction or position relationship is based on the attached Figure 5 The direction of the arrow F1 shown; the "second direction" direction or position relationship is based on the attached Figure 5 It should be understood that these directional terms are only for the convenience of describing the present application and simplifying the description, and do 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 limiting the present application.

[0034] The embodiment of the present application provides a cosmic ray shielding cabin. After the measuring part of the radiation measuring instrument enters the cosmic ray shielding cabin with the measured person, the cosmic ray shielding cabin can shield and block the external cosmic rays, so that the measuring part of the radiation measuring instrument can measure the radiation value of the trace radioactive nuclides retained in the measured person's body.

[0035] Specifically, see Figures 1 to 4The cosmic ray shielding cabin includes a plurality of shielding walls 10, which are arranged to form a shielding space 10a. The shielding walls 10 include a first polyethylene layer 11, a first copper layer 12, a first lead layer 13 and a first carbon steel layer 14 in sequence along a direction away from the shielding space 10a.

[0036] That is to say, the external cosmic rays need to pass through the first carbon steel layer 14, the first lead layer 13, the first copper layer 12 and the first polyethylene layer 11 in sequence from the outside to the inside.

[0037] The shielded space 10a is for the subject and the radiation measuring instrument to enter. In the shielded space 10a, the radiation measuring instrument measures the radiation value of the trace radioactive nuclides retained in the subject's body.

[0038] Cosmic rays refer to the particle streams that are shot into the atmosphere from the universe, namely primary cosmic rays, and the secondary products produced by the reaction of these particle streams with atomic nuclei in the atmosphere, namely secondary cosmic rays.

[0039] Specifically, primary cosmic rays are extremely high-energy protons and a small number of alpha particles and various atomic nuclei that enter the upper atmosphere of the Earth from space. The energy of these particles can be greater than 107keV. They interact with atomic nuclei in the atmosphere and produce a large number of secondary particles and photons to form secondary cosmic rays, mainly including muons, electrons, photons and nucleons.

[0040] Among them, muons have great penetrating power and are called the hard component of cosmic rays. In contrast, the nuclear component with weak penetrating power is called the soft component of cosmic rays. According to ground observation data, the nuclear component and the pion component account for 20% in total, the muon component accounts for 10%, and the rest are electrons and gamma rays of the cascade shower component. Although neutrons can be induced in various interactions between primary cosmic rays and atomic nuclei in the atmosphere, it is generally believed that the neutrons produced are only a few percent of the electron density. In the process of cosmic rays penetrating materials, a large number of high-energy electrons, bremsstrahlung, annihilation photons, muons, X-rays and neutrons will be generated due to interactions such as ionization excitation.

[0041] It is understandable that, due to the strong penetrating power of muons, the first polyethylene layer 11, the first copper layer 12, the first lead layer 13 and the first carbon steel layer 14 do not shield the muons, but allow the muons to directly pass through the cosmic ray shielding cabin, thereby making it difficult for the muons to have an adverse effect on the measurement results of the measuring instruments located in the shielding space 10a.

[0042] The first carbon steel layer 14 is used to shield the soft components in cosmic rays and the gamma radiation in the external environment.

[0043] It should be noted that the atomic nuclei in the first carbon steel layer 14 can interact with the soft components in the cosmic rays and the gamma radiation of the surrounding environment to generate secondary rays.

[0044] The first lead layer 13 is used to shield the secondary rays generated by the interaction between the first carbon steel layer 14 and the soft components in the cosmic rays and the gamma radiation of the surrounding environment, and its main function is to absorb scattered radiation and characteristic radiation.

[0045] It should be noted that the hard component muons in the secondary cosmic rays interact with the lead in the first lead layer 13 to emit characteristic X-rays of 75keV and 85keV. In addition, the lead material also contains a certain amount of radioactive nuclides. 210 Pb, 210 Pb decays and emits 46.5 keV gamma rays.

[0046] The first copper layer 12 is used to shield characteristic X-rays derived from the lead in the first lead layer 13 and gamma rays generated by decay.

[0047] It should be noted that copper and cosmic rays can interact with each other and derive corresponding characteristic X-rays.

[0048] The first polyethylene layer 11 is used to absorb characteristic X-rays emitted by the interaction between copper in the first copper layer 12 and cosmic rays.

[0049] It can be understood that compared with lead, copper and polyethylene, carbon steel has higher structural strength. Therefore, the first carbon steel layer 14 forms the main load-bearing structure of the shielding wall 10, so that the first polyethylene layer 11, the first copper layer 12 and the first lead layer 13 are fixed to the first carbon steel layer 14, thereby reducing the deformation and collapse of the first polyethylene layer 11, the first copper layer 12 and the first lead layer 13 under the action of gravity, which may have an adverse effect on the normal work of the subject in the shielding space 10a.

[0050] The cosmic ray shielding cabin in the embodiment of the present application is composed of materials that do not block the hard components in cosmic rays, which is beneficial to reducing the outer contour size of the shielding wall 10; it shields the soft components in cosmic rays and the gamma radiation of the surrounding environment, which is beneficial to reducing the background count of the radiation measuring instrument in the radiation measurement operation caused by cosmic rays and secondary particles, and is beneficial to improving the measurement accuracy; by arranging the first polyethylene layer 11, the first copper layer 12, the first lead layer 13 and the first carbon steel layer 14 in sequence from the inside to the outside, it can gradually absorb the derived secondary rays generated by the reaction of the previous layer of material from the inside to the outside, thereby further reducing the interference with the radiation measurement operation in the shielding space 10a.

[0051] In some embodiments, see Figure 4, along the direction away from the shielding space 10a, the first polyethylene layer 11, the first copper layer 12, the first lead layer 13 and the first carbon steel layer 14 are stacked in sequence.

[0052] The specific carbon steel material type used in the first carbon steel layer 14 is not limited, for example, grade A Q235 steel. The specific components and related mass fractions of this grade of carbon steel can refer to the Chinese national standard "Carbon Structural Steel" (GB / T 700-2006).

[0053] In some embodiments, see Figure 3 , along the direction away from the shielding space 10a, the thickness of the first carbon steel layer 14 ranges from 100 mm (millimetre) to 200 mm, that is, 100 mm ≤ D4 ≤ 200 mm.

[0054] The thickness of the first carbon steel layer 14 refers to the dimension of the first carbon steel layer 14 along a direction away from the shielding space 10 a .

[0055] In this way, the first carbon steel layer 14 can meet the requirement of attenuation of the soft components in cosmic rays and the gamma radiation of the surrounding environment.

[0056] The specific thickness of the first carbon steel layer 14 may be 100 mm, 110 mm, 120 mm, 130 mm, 140 mm, 150 mm, 160 mm, 170 mm, 180 mm, 190 mm, 200 mm, etc.

[0057] The specific manufacturing method of the first carbon steel layer 14 is not limited. For example, multiple layers of carbon steel plates of standard thickness are stacked and fixed by welding or the like.

[0058] It is understood that the first lead layer 13 is made of low-background lead material. Specifically, the radioactivity content of the lead material in the first lead layer 13 is lower than 200 Bq / t (Becquerel per ton) to reduce the radioactive nuclides in the lead material. 210 Pb interferes with measurement operations.

[0059] In some embodiments, see Figure 4 , along the direction away from the shielding space 10a, the thickness of the first lead layer 13 ranges from 5mm to 15mm, that is, 5mm≤D3≤15mm.

[0060] The thickness of the first lead layer 13 refers to the dimension of the first lead layer 13 in a direction away from the shielding space 10 a .

[0061] This is beneficial to reducing the cost of manufacturing the first lead layer 13 and also facilitates the first lead layer 13 to meet the requirement of attenuation amplitude of secondary rays generated by the interaction of the first carbon steel layer 14 with the soft components in cosmic rays and the gamma radiation of the surrounding environment.

[0062] The specific thickness of the first lead layer 13 can be 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 11mm, 12mm, 13mm, 14mm, 15mm, etc.

[0063] In some embodiments, see Figure 4 , along the direction away from the shielding space 10a, the thickness of the first copper layer 12 ranges from 5 mm to 10 mm, that is, 5 mm ≤ D2 ≤ 10 mm.

[0064] The thickness of the first copper layer 12 refers to the dimension of the first copper layer 12 in a direction away from the shielding space 10 a .

[0065] This is beneficial to reducing the cost of manufacturing the first copper layer 12 and also beneficial for the first copper layer 12 to meet the requirements for the attenuation amplitude of the characteristic X-rays derived from the lead in the first lead layer 13 and the gamma-rays generated by decay.

[0066] In some embodiments, the first copper layer 12 is made of oxygen-free copper material.

[0067] The thickness of the first copper layer 12 may specifically be 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, 10 mm, etc.

[0068] In some embodiments, see Figure 4 , along the direction away from the shielding space 10a, the thickness of the first polyethylene layer 11 ranges from 2 mm to 10 mm, that is, 2 mm ≤ D1 ≤ 10 mm.

[0069] The thickness of the first polyethylene layer 11 refers to the dimension of the first polyethylene layer 11 in a direction away from the shielding space 10 a .

[0070] In this way, the first polyethylene layer 11 is conducive to meeting the required attenuation effect on the characteristic X-rays emitted by the interaction between the copper in the first copper layer 12 and cosmic rays. The polyethylene material is relatively soft, which is conducive to reducing the probability of the person being measured and the radiation measuring instrument being injured and damaged by collision in the shielded space 10a.

[0071] The thickness of the first polyethylene layer 11 can specifically be 2 mm, 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, 10 mm, etc.

[0072] In some embodiments, see Figures 2 to 4The plurality of shielding walls 10 are spliced ​​with each other, the peripheral edges of the shielding walls 10 are stepped surfaces, and the stepped surfaces of two adjacent shielding walls 10 fit each other.

[0073] The stepped surface forms a plurality of bending sections at the joint between two adjacent shielding walls 10, so that after cosmic rays and other secondary rays in the surrounding environment enter the joint, they need to undergo multiple reflections, thereby reducing the possibility of cosmic rays and secondary rays being emitted from the joint and entering the shielding space 10a.

[0074] In some embodiments, see Figure 3 and Figure 4 The edge of the first carbon steel layer 14 is provided with a plurality of stepped surfaces. The thickness of the first carbon steel layer 14 is larger than that of the other layers, so that it is convenient to process and form a plurality of stepped surfaces.

[0075] In some embodiments, see Figure 4 On the same shielding wall 10, the first lead layer 13, the first copper layer 12 and the first polyethylene layer 11 are stacked on each other, and in the projection plane perpendicular to the stacking direction between the three, the projection outline of the first lead layer 13, the projection outline of the first copper layer 12 and the projection outline of the first polyethylene layer 11 increase successively, so as to form a step surface between the first lead layer 13 and the first copper layer 12, and between the first copper layer 12 and the first polyethylene layer 11.

[0076] In some embodiments, see Figure 4 At least part of the shielding wall 10 is a first shell, and the first shell also includes a support frame 19, the support frame 19 includes a support component 191 and a fixing member 192, the support component 191 is sandwiched between the first polyethylene layer 11 and the first copper layer 12, and the fixing member 192 connects the support component 191 and the first carbon steel layer 14.

[0077] It is understandable that the density of copper and lead is relatively large and the structural strength of both is lower than that of carbon steel. Therefore, the first copper layer 12 and the first lead layer 13 are easily deformed under the action of external force and their own gravity.

[0078] The supporting assembly 191 and the first carbon steel layer 14 are connected by a fixing member 192, so that the first copper layer 12 and the first lead layer 13 are sandwiched between the supporting assembly 191 and the first carbon steel layer 14, and the position and shape of the first copper layer 12 and the first lead layer 13 are constrained to reduce the adverse effects of deformation of the two on the shielding effect.

[0079] The specific type of the fixing part 192 is not limited. For example, the fixing part 192 is a screw. A threaded hole is provided on the surface of the first carbon steel layer 14 close to the shielding space 10a. The supporting assembly 191 is provided with a penetrating countersunk hole. The fixing part 192 passes through the countersunk hole, the through hole of the first copper layer 12, and the through hole of the first lead layer 13 and extends into the threaded hole of the first carbon steel layer 14. The threaded connection facilitates the installation and disassembly of the fixing part 192. The countersunk hole is used to prevent the fixing part 192 from protruding from the first polyethylene layer 11, making it easier for the first polyethylene layer 11 to cover the fixing part 192.

[0080] The first polyethylene layer 11 covers the support frame 19 so that the person being measured and the radiation measuring instrument will not directly collide with the support frame 19 . The first polyethylene layer 11 plays a buffering role.

[0081] The specific structural form of the support assembly 191 is not limited.

[0082] For example, see Figure 5 The support assembly 191 includes a first support member 1911 and a second support member 1912. The first support member 1911 extends along the first direction, and the second support member 1912 extends along the second direction. The thickness direction, the first direction and the second direction of the shielding wall 10 are perpendicular to each other. The first support member 1911 is connected to the second support member 1912 and at least one of the two is in contact with the inner wall of the first copper layer 12. At least one of the first support member 1911 and the second support member 1912 is connected to the fixing member 192.

[0083] In this way, the first support member 1911 and the second support member 1912 are conducive to forming a frame structure, which is conducive to reducing the weight of the support component 191 while restraining the first copper layer 12 and the first lead layer 13, thereby facilitating the disassembly and assembly of the support component 191.

[0084] The specific method of manufacturing the first support member 1911 and the second support member 1912 is not limited. For example, the first support member 1911 and the second support member 1912 are both made of rectangular stainless steel pipes, and the first support member 1911 and the second support member 1912 are connected by welding.

[0085] Understandably, see Figure 5 , the number of the first support members 1911 and the number of the second support members 1912 are both multiple.

[0086] It is understandable that all shielding walls 10 may include the support frame 19 , that is, all shielding walls 10 are the first shell; or part of the shielding walls 10 may be the first shell.

[0087] In some embodiments, see Figure 3 and Figure 4The shielding wall 10 includes a top shell 15 , which is located at the top side of the cosmic ray shielding cabin along the vertical direction, and the first shell forms the top shell 15 .

[0088] The top case 15 forms a top surface of the shielding space 10 a , and includes a supporting frame 19 .

[0089] In this way, the support frame 19 reduces the risk of collapse and deformation of the first copper layer 12 and the first lead layer 13 in the top shell 15 under the action of gravity, which is beneficial to maintaining the position and shape of the first copper layer 12 and the first lead layer 13, so that the shielding effect of the first copper layer 12 and the first lead layer 13 meets the requirements.

[0090] It can be understood that the cosmic ray shielding cabin may have only one top shell 15 or may have multiple top shells 15 .

[0091] In some embodiments, see Figure 3 and Figure 4 The shielding wall 10 includes a side shell 16 , which is located at at least one side of the cosmic ray shielding cabin along the horizontal direction, and the first shell forms the side shell 16 .

[0092] The side housing 16 forms a surface of at least one side of the shielding space 10 a in the horizontal direction, and includes a support frame 19 .

[0093] In this way, the support frame 19 reduces the probability of the first copper layer 12 and the first lead layer 13 in the top shell 15 being bent and deformed due to shaking and their own gravity, which is beneficial to maintaining the position and shape of the first copper layer 12 and the first lead layer 13, so that the shielding effect of the first copper layer 12 and the first lead layer 13 meets the requirements.

[0094] The specific number of the side shells 16 is not limited, and can be one or more.

[0095] In some embodiments, see Figure 1 , Figures 6 to 8 Part of the shielding wall 10 is a side shell 16, which is located on one side of the cosmic ray shielding cabin along the horizontal direction. The side shell 16 is provided with a first channel 16a, which runs through the side shell 16 and is connected to the shielding space 10a. The cosmic ray shielding cabin also includes a shield 20, which covers the opening of the first channel 16a at one end away from the shielding space 10a and is surrounded by the side shell 16 to form a second channel 20a, and the second channel 20a connects the first channel 16a with the outside of the cosmic ray shielding cabin.

[0096] In this way, the first channel 16a and the second channel 20a make the shielded space 10a communicate with the outside of the cosmic ray shielding cabin. On the one hand, the relevant pipelines of the radiation measuring instrument can enter the shielded space 10a through the first channel 16a and the second channel 20a, so that the radiation measuring instrument can work normally; on the other hand, the first channel 16a and the second channel 20a can play a ventilation role, so that the measured person can normally participate in the measurement work in the shielded space 10a.

[0097] It can be understood that it is necessary to reduce the probability of cosmic rays entering the shielded space 10a through the first channel 16a and the second channel 20a.

[0098] Specifically, see Figure 7 The opening of the second channel 20a connecting to the outside of the cosmic ray shielding cabin is located below the second channel 20a in the vertical direction.

[0099] That is, the opening of the second passage 20a communicating with the outside of the cosmic ray shielding cabin faces the ground.

[0100] It is understandable that cosmic rays mainly enter the atmosphere from space, and the main propagation direction of cosmic rays is from top to bottom. Therefore, it is difficult for cosmic rays to directly enter the second channel 20a through the opening of the second channel 20a connected to the outside of the cosmic ray shielding cabin, thereby reducing the probability of cosmic rays entering the shielding space 10a.

[0101] In some embodiments, see Figure 7 The first channel 16a extends in the horizontal direction, the second channel 20a extends in the vertical direction, and the opening of the second channel 20a connected to the outside of the cosmic ray shielding cabin is lower than the opening of the first channel 16a for connecting with the second channel 20a.

[0102] In this way, even if cosmic rays enter the second channel 20a, it is difficult for them to propagate in a straight line into the first channel 16a. They need to be reflected and deflected in the second channel 20a before they can enter the first channel 16a. During the cosmic ray emission process, at least part of the cosmic rays can be shielded and absorbed by the shield 20 and the side shell 16, which is beneficial to reduce the cosmic rays entering the first channel 16a.

[0103] It is understandable that the shield 20 itself also needs to shield cosmic rays to reduce the probability of cosmic rays passing through the shield 20 and entering the first channel 16 a.

[0104] In some embodiments, the shield 20 includes a plurality of protective walls, which are spliced ​​with each other and enclosed with the side shell 16 to form a second channel 20a, and the shielding wall 10 includes a second polyethylene layer 21, a second copper layer 22, a second lead layer 23 and a second carbon steel layer 24 in sequence along the direction away from the second channel 20a.

[0105] That is to say, the external cosmic rays need to pass through the second carbon steel layer 24, the second lead layer 23, the second copper layer 22 and the second polyethylene layer 21 in sequence from the outside to the inside.

[0106] In this way, by arranging the second polyethylene layer 21, the second copper layer 22, the second lead layer 23 and the second carbon steel layer 24 in sequence from the inside to the outside, while shielding and absorbing cosmic rays, they can gradually absorb the derived secondary rays generated by the reaction of the previous layer of material from the inside to the outside, thereby further reducing the probability of cosmic rays and derived secondary rays entering the first channel 16a.

[0107] In some embodiments, see Figure 4 , along the direction away from the second channel 20a, the second polyethylene layer 21, the second copper layer 22, the second lead layer 23 and the second carbon steel layer 24 are stacked in sequence.

[0108] The specific carbon steel material type used for the second carbon steel layer 24 is not limited, for example, grade A Q235 steel.

[0109] In some embodiments, see Figure 3 , along the direction away from the second channel 20a, the thickness of the second carbon steel layer 24 ranges from 100 mm to 200 mm, that is, 100 mm ≤ D4 ≤ 200 mm.

[0110] The thickness of the second carbon steel layer 24 refers to the dimension of the second carbon steel layer 24 along a direction away from the second channel 20 a .

[0111] In this way, the second carbon steel layer 24 can meet the requirement of attenuating the soft components in cosmic rays and the gamma radiation of the surrounding environment.

[0112] The specific thickness of the second carbon steel layer 24 may be 100 mm, 110 mm, 120 mm, 130 mm, 140 mm, 150 mm, 160 mm, 170 mm, 180 mm, 190 mm, 200 mm, etc.

[0113] The specific manufacturing method of the second carbon steel layer 24 is not limited. For example, multiple layers of carbon steel plates of standard thickness are stacked and fixed by welding or the like.

[0114] It is understandable that the second lead layer 23 is made of low-background lead material. Specifically, the radioactive content of the lead material in the second lead layer 23 is lower than 200 Bq / t, so as to reduce the radioactive nuclides in the lead material. 210 Pb interferes with measurement operations.

[0115] In some embodiments, see Figure 4, along the direction away from the second channel 20a, the thickness of the second lead layer 23 ranges from 5 mm to 15 mm, that is, 5 mm ≤ D3 ≤ 15 mm.

[0116] The thickness of the second lead layer 23 refers to the dimension of the second lead layer 23 in a direction away from the second channel 20 a .

[0117] This is beneficial to reducing the cost of manufacturing the second lead layer 23 and also facilitates the second lead layer 23 to meet the requirement of attenuation of secondary rays generated by the interaction of the second carbon steel layer 24 with the soft components in cosmic rays and the gamma radiation of the surrounding environment.

[0118] The specific thickness of the second lead layer 23 can be 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 11mm, 12mm, 13mm, 14mm, 15mm, etc.

[0119] In some embodiments, see Figure 4 , along the direction away from the second channel 20a, the thickness of the second copper layer 22 ranges from 5 mm to 10 mm, that is, 5 mm ≤ D2 ≤ 10 mm.

[0120] The thickness of the second copper layer 22 refers to the dimension of the second copper layer 22 along a direction away from the second channel 20 a .

[0121] This is beneficial to reducing the cost of manufacturing the second copper layer 22 and also beneficial for the second copper layer 22 to meet the requirements for the attenuation amplitude of the characteristic X-rays derived from the lead in the second lead layer 23 and the gamma rays generated by decay.

[0122] In some embodiments, the second copper layer 22 is made of oxygen-free copper material.

[0123] The thickness of the second copper layer 22 may specifically be 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, 10 mm, etc.

[0124] In some embodiments, see Figure 4 , along the direction away from the second channel 20a, the thickness of the second polyethylene layer 21 ranges from 2 mm to 10 mm, that is, 2 mm ≤ D1 ≤ 10 mm.

[0125] The thickness of the second polyethylene layer 21 refers to the dimension of the second polyethylene layer 21 along a direction away from the second channel 20 a .

[0126] In this way, the second polyethylene layer 21 can meet the required attenuation effect on the characteristic X-rays emitted by the interaction between the copper in the second copper layer 22 and cosmic rays. The polyethylene material is relatively soft, which helps to reduce the probability of the person being measured and the radiation measuring instrument being injured and damaged by collision in the second channel 20a.

[0127] The thickness of the second polyethylene layer 21 may specifically be 2 mm, 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, 10 mm, etc.

[0128] The specific method of splicing the multiple retaining walls is not limited, for example, two adjacent retaining walls are fixed by screws and angle steels.

[0129] In some embodiments, see Figure 7 The peripheral edge of the guard wall is a stepped surface, and the stepped surfaces of two adjacent guard walls fit each other.

[0130] The stepped surface forms a plurality of bending sections in the joint between two adjacent protective walls, so that after cosmic rays and other secondary rays in the surrounding environment enter the joint, they need to undergo multiple reflections, thereby reducing the possibility of cosmic rays and secondary rays being emitted from the joint and entering the second channel 20a.

[0131] In some embodiments, see Figure 8 A positioning groove 16b is provided on the outer surface of the side shell 16, and the positioning groove 16b surrounds at least part of the peripheral edge of the opening of the first channel 16a away from the shielding space 10a, and a part of the shield 20 is embedded in the positioning groove 16b.

[0132] In this way, on the one hand, the groove wall of the positioning groove 16b can play a positioning role for the shield 20; on the other hand, the joint between the shield 20 and the side shell 16 can form multiple bending sections, so that after cosmic rays and other secondary rays in the surrounding environment enter the joint, they need to undergo multiple reflections, thereby reducing the possibility of cosmic rays and secondary rays being emitted from the joint and entering the first channel 16a.

[0133] The specific installation method between the shield 20 and the side shell 16 is not limited. For example, the shield 20 and the side shell 16 are fixed by screws to facilitate the disassembly and assembly of the two.

[0134] In some embodiments, see Figure 1 , Figure 2 and Figure 6 The shielding wall 10 includes a mounting shell 17 and at least one door 18. The door 18 is located on at least one side of the cosmic ray shielding cabin along the horizontal direction. The door 18 and the mounting shell 17 can be movably configured to open or close the shielding space 10a.

[0135] When the door 18 is in a state of opening the shielding space 10a, at least one side of the shielding space 10a in the horizontal direction is open to form an opening, so that the person being measured can enter the shielding space 10a through the opening.

[0136] When the door 18 is in the closed shielding space 10a, the radiation value generated by the trace radioactive nuclides retained in the body of the subject is detected by the radiation measuring instrument.

[0137] In some embodiments, the door body 18 is the side housing 16 .

[0138] In some embodiments, see Figure 6 , the side housing 16 forms a mounting housing 17 .

[0139] In some embodiments including the shield 20, see Figure 6 The protective cover 20 is disposed on the mounting shell 17 .

[0140] The number of the door bodies 18 is not limited, and can be one or two. The number of the mounting shells 17 is not limited, and can be one or two.

[0141] The specific method of realizing the movable configuration between the door body 18 and the mounting shell 17 is not limited.

[0142] For example, see Figure 6 The door body 18 and the mounting shell 17 are hinged so that the two can rotate relative to each other. The cosmic ray shielding cabin also includes a driving component 30, which is arranged in one of the door body 18 and the mounting shell 17, and the driving part of the driving component 30 is connected to the other to drive the door body 18 to rotate relative to the mounting shell 17.

[0143] In some embodiments, see Figure 6 The driving assembly 30 includes a motor assembly 31, a first connecting rod 32 and a second connecting rod 33. The motor assembly 31 is arranged on the mounting shell 17. The output end of the motor assembly 31 is fixed to one end of the first connecting rod 32. The other end of the first connecting rod 32 is rotatably connected to one end of the second connecting rod 33. The other end of the second connecting rod 33 is rotatably connected to the door body 18.

[0144] The motor assembly 31 drives the first connecting rod 32 to rotate, thereby causing the second connecting rod 33 to drive the door body 18 to move.

[0145] The door body 18 is rotatably connected to the mounting housing 17 via a hinge. A rotating shaft and a bearing are provided in the hinge. The rotating shaft passes through the bearing to reduce the friction force that needs to be overcome to push the door body 18 .

[0146] The number of hinges between the mounting housing 17 and the single door body 18 can be multiple or one.

[0147] In a power-off state, the door body 18 can be removed from the mounting housing 17 by taking out the rotating shaft in the hinge, so that the person being tested can enter and exit the shielding space 10a.

[0148] The bearing in the hinge can be a radial thrust ball bearing to improve the bearing capacity of the door body 18; it can also be a single-row tapered roller bearing to withstand the torque caused by the deadweight of the door body 18; it can also be both.

[0149] It is understandable that the motor assembly 31 includes a motor and a reducer. The motor is equipped with a brake, which can automatically lock the position of the door body 18 when the door is opened or closed.

[0150] In some embodiments, the cosmic ray shielding cabin further comprises a control device, which is electrically connected to the motor assembly 31. After the control device is programmed, the multiple doors 18 can be automatically opened and closed in a predetermined order through a button switch, and the rotation speed and opening angle of the door 18 can be programmably adjusted, so that the door 18 opens and closes slowly, smoothly, safely and reliably.

[0151] In some embodiments, the cosmic ray shielding cabin further comprises a laser sensor, which is disposed at the door body 18 and the opening of the shielding space 10a, and is used to emit a laser to sense whether there is a foreign object in the preset scanning area. When it is determined that there is a foreign object in the preset scanning area, the control device controls the motor assembly 31 to stop driving the door body 18 to move.

[0152] The above is only a preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A cosmic ray shielding cabin, characterized in that: The cosmic ray shielding cabin includes a plurality of shielding walls, which are arranged to form a shielding space. The shielding walls sequentially include a first polyethylene layer, a first copper layer, a first lead layer and a first carbon steel layer in a direction away from the shielding space.

2. The cosmic ray shielding cabin according to claim 1, characterized in that: In a direction away from the shielding space, the thickness of the first carbon steel layer ranges from 100 mm to 200 mm; And / or, the thickness of the first lead layer ranges from 5 mm to 15 mm.

3. The cosmic ray shielding cabin according to claim 1, characterized in that: Along the direction away from the shielding space, the thickness of the first copper layer ranges from 5 mm to 10 mm; And / or, the thickness of the first polyethylene layer ranges from 2 mm to 10 mm.

4. The cosmic ray shielding cabin according to claim 1, characterized in that: The plurality of shielding walls are spliced ​​with each other, the peripheral edges of the shielding walls are stepped surfaces, and the stepped surfaces of two adjacent shielding walls are fitted with each other.

5. The cosmic ray shielding cabin according to claim 1, characterized in that: At least part of the shielding wall is a first shell, the first shell also includes a support frame, the support frame includes a support component and a fixing part, the support component is sandwiched between the first polyethylene layer and the first copper layer, and the fixing part connects the support component and the first carbon steel layer.

6. The cosmic ray shielding cabin according to claim 5, characterized in that: The support assembly includes a first support member and a second support member, the first support member extends along a first direction, the second support member extends along a second direction, the thickness direction of the shielding wall, the first direction and the second direction are perpendicular to each other, the first support member is connected to the second support member and at least one of the two is in contact with the inner wall of the first copper layer, and at least one of the first support member and the second support member is connected to the fixing member.

7. The cosmic ray shielding cabin according to claim 5, characterized in that: The shielding wall comprises a top shell, the top shell is located on the top side of the cosmic ray shielding cabin in the vertical direction, and the first shell forms the top shell; And / or, the shielding wall includes a side shell, the side shell is located on at least one side of the cosmic ray shielding cabin along the horizontal direction, and the first shell forms the side shell.

8. The cosmic ray shielding cabin according to claim 1, characterized in that: Part of the shielding wall is a side shell, which is located on one side of the cosmic ray shielding cabin in the horizontal direction. The side shell is provided with a first channel, which runs through the side shell and is connected to the shielding space. The cosmic ray shielding cabin also includes a shield, which covers the opening of the first channel away from one end of the shielding space and is surrounded by the side shell to form a second channel, which connects the first channel with the outside of the cosmic ray shielding cabin, and the opening of the second channel connecting the outside of the cosmic ray shielding cabin is located below the second channel in the vertical direction.

9. The cosmic ray shielding cabin according to claim 8, characterized in that: The first channel extends in a horizontal direction, the second channel extends in a vertical direction, and an opening of the second channel communicating with the outside of the cosmic ray shielding cabin is lower than an opening of the first channel for communicating with the second channel.

10. The cosmic ray shielding cabin according to claim 8, characterized in that: The shield includes a plurality of protective walls, which are spliced ​​with each other and surrounded by the side shell to form the second channel. The shielding wall includes a second polyethylene layer, a second copper layer, a second lead layer and a second carbon steel layer in sequence along a direction away from the second channel.

11. The cosmic ray shielding cabin according to claim 10, characterized in that: In a direction away from the second channel, the thickness of the second carbon steel layer ranges from 100 mm to 200 mm; And / or, the thickness of the second lead layer ranges from 5 mm to 15 mm.

12. The cosmic ray shielding cabin according to claim 10, characterized in that: Along the direction away from the second channel, the thickness of the second copper layer ranges from 5 mm to 10 mm; And / or, the thickness of the second polyethylene layer is in the range of 2 mm to 10 mm.

13. The cosmic ray shielding cabin according to claim 8, characterized in that: A positioning groove is provided on the outer surface of the side shell, and the positioning groove surrounds at least a portion of the peripheral edge of the opening of the first channel away from one end of the shielding space, and a part of the shield is embedded in the positioning groove.

14. The cosmic ray shielding cabin according to claim 1, characterized in that: The shielding wall includes a mounting shell and at least one door body, wherein the door body is located on one side of the cosmic ray shielding cabin along the horizontal direction, and the door body and the mounting shell can be movably configured to open or close the shielding space.

Images