Scintillator assembly, scintillator packaging structure and detector

Abstract

The present application discloses a scintillator assembly, a scintillator packaging structure and a detector, and relates to the field of nuclear radiation detection technology. The scintillator assembly includes a plurality of lithium glass scintillator columns, each of which includes a front end face, a rear end face, an inner side face and an outer side face; a plurality of columns are spliced ​​into a hollow columnar structure; the front end face of each column is respectively located at the first end of the columnar structure, and the rear end face is respectively located at the second end of the columnar structure; the first end face of the columnar structure serves as the light emitting surface of the scintillator assembly; the inner side face of each column faces the inner side of the columnar structure, and the outer side face faces the outer side of the columnar structure; the outer side face of the columnar structure serves as the radiation incident surface of the scintillator assembly; the inner side faces of a plurality of lithium glass scintillator columns surround and form a hollow cavity of the columnar structure. The scheme of the present application utilizes slender lithium glass scintillator columns to splice together to obtain a large-sized lithium glass scintillator, which can effectively increase the detection efficiency of the lithium glass scintillator.

Description

Technical Field

[0001] The present invention relates to the technical field of nuclear radiation detection, and in particular to a scintillator assembly, a scintillator packaging structure and a detector. Background Art

[0002] In oil and gas field exploration, neutron logging is a very effective logging method for obtaining physical parameters of gas layers. Neutron logging data can be used to determine reservoir porosity, shale content, rock composition, and distinguish between oil-water layers, oil-gas layers, and water-gas layers. Since neutrons are not charged, they cannot directly cause "ionization" and "excitation" of matter. Neutron detection is mainly achieved by detecting secondary charged particles generated by their interaction with matter. In the past, the oil industry mainly purchased 3 He tubes to test neutrons, 3 He tube is made of high purity 3 He gas as working gas 3 He proportional counter. 3 He pipes often have the following problems when in use: 3 During long-term use or storage of He tubes, air may infiltrate the counter tubes and the negative electrode in the gas may be contaminated and accumulated, which may cause the tubes to fail easily and shorten their service life. 3 The detection efficiency of He tube is directly related to the inflation pressure. Within a certain diameter range, the inflation pressure can only be maintained within a relatively narrow range, which limits its detection efficiency to a certain extent. At the same time, it is difficult to reduce the size of the detector in order to ensure the detection efficiency. In addition, helium has been in short supply in recent years and its price has soared several times. For the above reasons, the oil industry has begun to seek new detection devices. At present, Ce-doped 6 Li glass scintillator, a material that emits light by interacting with neutrons incident on it. Combining a neutron scintillator with a photodetector (such as a photomultiplier tube) can form a scintillation neutron detector, which can be used to detect neutrons. 6 The scintillation neutron detector composed of Li glass scintillator is used as the above 3 The replacement of He detectors will be the future application trend in oil well logging.

[0003] Lithium glass scintillator has a short scintillation decay time, good temperature performance, and high slow neutron detection efficiency. At the same time, lithium glass scintillator does not deliquesce, is resistant to acid and alkali, and can withstand rapid changes in high and low temperatures. Therefore, in harsh environments with corrosive liquids and steam, other scintillators cannot be used, but lithium glass scintillator can still work. Because lithium glass scintillator has strong radiation resistance, it has a long working life. At the same time, its advantages of high detection efficiency can solve the problem of 3 The problem of long life and high detection efficiency exists in He tube applications.

[0004] In general environmental detection, cylindrical lithium glass is used due to the requirements for detection efficiency. However, lithium glass has strict requirements on atmosphere and other conditions during the melting process, so the volume of melted lithium glass is small, and the size of the processed lithium glass cylinder is also small. Since the detection efficiency of the scintillator is related to the size of the scintillator, the size of the scintillator directly processed by the existing technology is small, with a maximum size of about φ25mm×50mm. In some occasions where large-sized lithium glass is required to meet high detection efficiency, it does not meet the detection requirements. To a certain extent, the application of lithium glass scintillator in oil well logging is limited. Summary of the invention

[0005] The embodiments of the present application provide a scintillator assembly, a scintillator packaging structure and a detector, which can solve the problem of application limitations caused by the small size of existing lithium glass scintillators.

[0006] In a first aspect, a scintillator assembly is provided, comprising:

[0007] A plurality of lithium glass scintillator columns, each of which comprises a front end face, a rear end face, an inner side face and an outer side face;

[0008] A plurality of the lithium glass scintillator columns are spliced ​​into a hollow columnar structure;

[0009] Wherein, the front end face of each lithium glass scintillator column is respectively located at the first end of the columnar structure, and the rear end face is respectively located at the second end of the columnar structure; the first end face of the columnar structure serves as the light emitting surface of the scintillator assembly;

[0010] The inner side surface of each of the lithium glass scintillator columns faces the inner side of the columnar structure, and the outer side surface faces the outer side of the columnar structure; the outer side surface of the columnar structure serves as the radiation incident surface of the scintillator assembly;

[0011] The inner side surfaces of the plurality of lithium glass scintillator columns surround and form a hollow cavity in the columnar structure.

[0012] Optionally, a light-guiding medium is disposed in the cavity.

[0013] Optionally, the cavity is in the shape of a regular prism;

[0014] The light-guiding medium is in the shape of a regular prism matched with the cavity, and the side length of the bottom surface of the light-guiding medium is less than or equal to the side length of the bottom surface of the cavity.

[0015] Optionally, the light-guiding medium and the plurality of lithium glass scintillator columns are connected by gap fitting; or

[0016] The light-guiding medium and the plurality of lithium glass scintillator columns are respectively provided with mortise and tenon structures that cooperate with each other, and the light-guiding medium and the plurality of lithium glass scintillator columns are connected through the mortise and tenon structures.

[0017] Optionally, the light-guiding medium is an optical glass or optical silicone gel light guide.

[0018] Optionally, the cross-section of the lithium glass scintillator column is trapezoidal or rectangular.

[0019] Optionally, the thickness between the inner side and the outer side of the lithium glass scintillator column is less than or equal to 3 mm.

[0020] Optionally, the light-guiding medium is coupled to the plurality of lithium glass scintillator columns via an optical coupling medium;

[0021] Two adjacent lithium glass scintillator columns are coupled via an optical coupling medium.

[0022] In a second aspect, a scintillator packaging structure is provided, comprising the scintillator assembly as described above, and further comprising:

[0023] The scintillator assembly is encapsulated in the shell; wherein an optical window is provided at one end of the shell, and a rear end cover is provided at the other end; the light emitting surface of the scintillator assembly is connected to the optical window, and the second end surface is connected to the rear end cover.

[0024] Optionally, the light emitting surface of the scintillator assembly is coupled to the optical window via an optical coupling medium, and a rear light reflecting layer is provided between the second end surface and the rear end cover;

[0025] A side light reflecting layer is arranged between the outer side surface of the scintillator assembly and the outer shell.

[0026] Optionally, a rear vibration reduction layer is further provided between the rear light reflection layer and the rear cover;

[0027] A side vibration reduction layer is also arranged between the side light reflecting layer and the shell.

[0028] In a third aspect, a detector is provided, comprising a photomultiplier tube, and further comprising: a scintillator packaging structure as described above, wherein an optical window of the scintillator packaging structure is coupled to the photomultiplier tube via an optical coupling medium.

[0029] In an embodiment of the present application, the scintillator assembly includes a plurality of lithium glass scintillator columns, each of which includes a front end face, a rear end face, an inner side face and an outer side face, and the plurality of lithium glass scintillator columns are spliced ​​into a hollow columnar structure. The front end face of each lithium glass scintillator column is respectively located at the first end of the columnar structure, and the rear end face is respectively located at the second end of the columnar structure; the first end of the columnar structure serves as the light-emitting surface of the scintillator assembly. The inner side face of each lithium glass scintillator column faces the inner side of the columnar structure, and the outer side face faces the outer side of the columnar structure; the outer side face of the columnar structure serves as the radiation incident surface of the scintillator assembly. The hollow columnar structure is obtained by splicing a plurality of lithium glass scintillator columns, which effectively increases the surface area of ​​the radiation incident surface of the lithium glass scintillator, thereby effectively increasing the detection efficiency of the lithium glass scintillator. The inner side faces of the plurality of lithium glass scintillator columns surround a hollow cavity of the columnar structure, and the hollow structural design avoids the lithium glass scintillator being too thick, which affects the energy resolution of neutrons and gamma rays, and ensures the detection accuracy. In this way, by splicing thin and long lithium glass scintillator columns, a hollow columnar scintillator assembly is obtained, which provides a large-sized lithium glass scintillator and can effectively increase the surface area of ​​the lithium glass scintillator, thereby effectively increasing the detection efficiency of the lithium glass scintillator and solving the problem of limitations caused by the small size of existing lithium glass. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 A schematic diagram showing the three-dimensional structure of a lithium glass scintillator column provided in an embodiment of the present application;

[0031] Figure 2 A schematic diagram showing the three-dimensional structure of a scintillator assembly provided in an embodiment of the present application;

[0032] Figure 3 A schematic diagram showing the three-dimensional structure of another scintillator assembly provided in an embodiment of the present application;

[0033] Figure 4 express Figure 3 A top view of the structure;

[0034] Figure 5 A schematic diagram showing the three-dimensional structure of another scintillator assembly provided in an embodiment of the present application;

[0035] Figure 6 express Figure 5 A top view of the structure;

[0036] Figure 7 A schematic diagram showing the mortise and tenon structure of a scintillator assembly provided in an embodiment of the present application;

[0037] Figure 8 A schematic diagram showing a scintillator packaging structure provided in an embodiment of the present application;

[0038] Fig. 9 A test energy spectrum diagram showing a hollow scintillator assembly without a light-guiding medium provided in an embodiment of the present application;

[0039] Fig.10 A test energy spectrum diagram of a scintillator assembly having a hollow light-guiding medium provided in an embodiment of the present application.

[0040] Description of reference numerals:

[0041] 100-scintillator assembly; 10-lithium glass scintillator column; 11-front end face; 12-rear end face; 13-inner side face; 14-outer side face; 15-columnar structure; 151-first end; 152-second end; 153-cavity; 16-light-guiding medium; 17-optical coupling medium; 200-housing; 21-optical window; 22-rear end cover; 23-rear end light reflection layer; 24-side light reflection layer; 25-rear end vibration reduction layer; 26-side vibration reduction layer; 27-laser welding point. DETAILED DESCRIPTION

[0042] The following will be combined with the drawings in the embodiments of the present application to clearly describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field belong to the scope of protection of this application.

[0043] The terms "first", "second", etc. in the specification and claims of the present application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than those illustrated or described here, and the objects distinguished by "first" and "second" are generally of the same type, and the number of objects is not limited. For example, the first object can be one or more. In addition, "and / or" in the specification and claims represents at least one of the connected objects, and the character " / " generally represents that the objects associated with each other are in an "or" relationship.

[0044] The scintillator assembly, scintillator packaging structure and detector provided in the embodiments of the present application are described in detail below through some embodiments and their application scenarios in combination with the accompanying drawings.

[0045] Embodiment 1

[0046] In the field of environmental detection such as oil well logging, lithium glass scintillator has been widely used due to its advantages of strong radiation resistance, long service life and high detection efficiency. However, lithium glass scintillator has strict requirements on atmosphere and other conditions during its growth process, so the volume of melted lithium glass scintillator is relatively small. In some occasions, large-sized lithium glass scintillator is required to meet high detection efficiency. Therefore, the small size of lithium glass scintillator limits its application in oil well logging to a certain extent.

[0047] In order to solve the limitation brought by the small size of existing lithium glass, the embodiments of the present application provide a large-sized lithium glass scintillator and its packaging structure.

[0048] See also Figure 1-7 As shown, the embodiment of the present application provides a scintillator assembly 100, including:

[0049] A plurality of lithium glass scintillator columns 10, each of which comprises a front end face 11, a rear end face 12, an inner side face 13 and an outer side face 14;

[0050] A plurality of the lithium glass scintillator columns 10 are spliced ​​into a hollow columnar structure 15;

[0051] The front end face 11 of each lithium glass scintillator column 10 is located at the first end 151 of the columnar structure 15, and the rear end face 12 is located at the second end 152 of the columnar structure 15; the end face of the first end 151 of the columnar structure 15 serves as the light emitting surface of the scintillator assembly 100;

[0052] The inner side surface 13 of each lithium glass scintillator column 10 faces the inner side of the columnar structure 15, and the outer side surface 14 faces the outer side of the columnar structure 15; the outer side surface of the columnar structure 15 serves as the radiation incident surface of the scintillator assembly 100;

[0053] The inner side surfaces 13 of the plurality of lithium glass scintillator columns 10 surround and form a hollow cavity 153 in the columnar structure 15 .

[0054] At this time, a plurality of thin and long lithium glass scintillator columns 10 are spliced ​​together to obtain a hollow columnar scintillator assembly 100, which provides a large-sized lithium glass scintillator and can effectively increase the surface area of ​​the lithium glass scintillator, thereby effectively increasing the detection efficiency of the lithium glass scintillator. Figure 1 As shown, each lithium glass scintillator column 10 has a small volume, is easy to process and is not limited by growth processing. Each lithium glass scintillator column 10 includes a front end face 11, a rear end face 12, an inner side face 13 and an outer side face 14. Figure 2As shown, the inner side surfaces 13 of the multiple lithium glass scintillator columns 10 face inward, the outer side surfaces 14 face outward, the front end surface 11 is at the first end 151, and the rear end surface 12 is at the second end 152, which are spliced ​​into a columnar structure 15 with a hollow cavity 153. A large-sized scintillator assembly 100 is obtained by splicing multiple lithium glass scintillator columns 10, which effectively increases the surface area of ​​the incident surface of the radiation, thereby effectively increasing the detection efficiency of the lithium glass scintillator. Among them, the hollow structure design is adopted to make the wall thickness of the lithium glass scintillator thinner, so as to avoid the lithium glass scintillator being too thick and affecting the energy resolution of neutrons and gamma rays, thereby ensuring the accuracy of detection. The solution of the embodiment of the present application solves the problem of limitations caused by the small size of the existing lithium glass.

[0055] As an optional implementation, Figure 2-7 As shown, the cavity 153 formed by the inner side surfaces 13 of the plurality of lithium glass scintillator columns 10 is in the shape of a regular prism.

[0056] At this time, by adopting a regular prism-shaped structural design, multiple lithium glass scintillator columns 10 can be evenly distributed in all directions, and the incident surface of the scintillator assembly 100 receiving radiation rays is also evenly distributed in all directions, ensuring that the scintillator assembly 100 has a strong detection capability for radiation rays in all directions, thereby improving the ability of oil logging.

[0057] The cavity 153 formed by the inner side surfaces 13 of the plurality of lithium glass scintillator columns 10 may be in the shape of a regular hexagonal prism, a regular heptagonal prism, a regular octagonal prism, etc., which may be adjusted according to the use requirements. The regular hexagonal prism in the figure is only an example.

[0058] As an optional implementation, Figure 1-4 As shown, the cross section of the lithium glass scintillator column 10 can be a trapezoid. The side where the upper base of the trapezoid is located is the inner side 13, and the side where the lower base is located is the outer side 14. The inner side 13 of multiple lithium glass scintillator columns 10 faces inward and the outer side 14 faces outward, and can be spliced ​​into a compact columnar structure 15. At this time, not only the cavity 153 of the columnar structure 15 is a regular prism, but the columnar structure 15 as a whole is also a regular prism, which further ensures the detection capability of the scintillator assembly 100 for radiation rays in all directions and improves the stability of the structure.

[0059] Among them, when the cross-section of the lithium glass scintillator column 10 is a trapezoid, the sum of the bottom angles of two adjacent trapezoids of two lithium glass scintillator columns 10 can be set not to differ too much from the vertex angle of the regular polygon of the cavity 153. The sum of the bottom angles of the two trapezoids can be set equal to the vertex angle of the regular polygon of the cavity 153. This measure is to prevent light loss at the joints of the lithium glass strips.

[0060] As another optional implementation, Figure 5-6 As shown, the cross section of the lithium glass scintillator column 10 can also be a rectangle. The side where the longer side of the rectangle is located is the inner side 13, and the side where the other longer side is located is the outer side 14. The inner side 13 of multiple lithium glass scintillator columns 10 faces inward, and the outer side 14 faces outward, and can be spliced ​​into a compact columnar structure 15. At this time, the columnar structure 15 is similar to a regular prism as a whole, and the incident surface of the scintillator assembly 100 receiving radiation rays is also evenly distributed in all directions, which can also achieve the effect of further ensuring the scintillator assembly 100's ability to detect radiation rays in all directions.

[0061] In the embodiment of the present application, two adjacent lithium glass scintillator columns 10 can be coupled via an optical coupling medium 17. At this time, when two adjacent lithium glass scintillator columns 10 contact each other, they can be coupled via the optical coupling medium to fill the tiny gap between the two contact surfaces, further preventing light loss.

[0062] The optical coupling medium 17 may be a high temperature resistant elastic coupling medium silicone gel with high optical transmittance, but is not limited thereto.

[0063] In the embodiment of the present application, if the gap between two adjacent lithium glass scintillator columns 10 is large, such as when the cross-section of the lithium glass scintillator column 10 is rectangular, a light reflection layer can be provided on the adjacent surfaces of the two lithium glass scintillator columns 10 to prevent light loss.

[0064] In the embodiment of the present application, a light reflection layer may be provided on the outer side surface 14 and the rear end surface 12 of each lithium glass scintillator column 10 to prevent light loss.

[0065] The light reflection layer may be made of a material with high reflection efficiency, such as a white diffuse reflection layer (polytetrafluoroethylene film, etc.), or a mirror reflection film (aluminum coating, aluminum foil, etc.), but is not limited thereto.

[0066] In the embodiment of the present application, the thickness between the inner side 13 and the outer side 14 of the lithium glass scintillator column 10 can be determined according to actual needs. In order to effectively distinguish neutrons and gamma rays, the thickness between the inner side 13 and the outer side 14 of the lithium glass scintillator column 10 can be set to be less than or equal to 3 mm.

[0067] Preferably, the thickness between the inner side 13 and the outer side 14 of the lithium glass scintillator column 10 is selected to be 2 mm. In this case, the wall thickness of the lithium glass scintillator is relatively thin, which can effectively distinguish neutrons and gamma rays and improve detection efficiency.

[0068] In the embodiment of the present application, the scintillator assembly 100 is set to a hollow structure to ensure that the wall thickness of the lithium glass scintillator is relatively thin, thereby avoiding the influence of the excessive thickness of the lithium glass scintillator on the energy resolution of neutrons and gamma rays. However, the applicant has found through experiments that for large-sized scintillators, if the aspect ratio is small (for example, less than 1), the overall light output uniformity of the hollow scintillator assembly 100 is good, and the discrimination effect of neutrons and gamma rays is good, but if the aspect ratio is large (for example, greater than 1), the light output uniformity of the hollow scintillator assembly 100 will be affected, and the main reason is that the air in the cavity 153 will have a certain influence on the light transmission.

[0069] In order to prevent the influence of the air in the cavity 153 on the light transmission, optionally, a light guiding medium 16 is provided in the cavity 153 .

[0070] At this time, by arranging the light-guiding medium 16 in the cavity 153 , the uniformity of the overall light output of the scintillator assembly 100 can be significantly improved, and the discrimination effect of neutrons and gamma rays can be enhanced.

[0071] like Fig. 9 As shown, when the hollow structure is designed and there is no light-guiding medium 16 in the middle, the scintillator assembly 100 has a poor effect of distinguishing the gamma peak (the first peak) and the neutron peak (the second peak), and the neutron peak energy resolution is low. Fig.10 As shown, when there is a light-guiding medium 16 in the middle, the gamma peak and the neutron peak can be clearly distinguished under the same conditions again, that is, the neutron peak energy resolution is better.

[0072] The light guide medium 16 may be optical glass, such as quartz or other high light transmittance optical glass. Alternatively, the light guide medium 16 may be optical silicone gel light guide, which has the characteristics of high temperature resistance and high light transmittance.

[0073] In the embodiment of the present application, the contact surfaces of the light-guiding medium 16 and the multiple lithium glass scintillator columns 10 can be coupled via an optical coupling medium 17 to fill the tiny gaps between the light-guiding medium 16 and the multiple lithium glass scintillator columns 10, thereby improving the light-guiding effect, and further improving the overall light output uniformity of the scintillator assembly 100, thereby improving the discrimination effect of neutrons and gamma rays.

[0074] As mentioned above, the optical coupling medium 17 may be a high temperature resistant elastic coupling medium silicone gel with high optical transmittance, but is not limited thereto.

[0075] As mentioned above, the cavity 153 formed by the inner side surfaces 13 of multiple lithium glass scintillator columns 10 can be a regular prism. When the cavity 153 is a regular prism, in order to achieve the coordinated installation of the light-guiding medium 16 and the cavity 153, optionally, the light-guiding medium 16 is a regular prism adapted to the cavity 153, and the side length of the bottom surface of the light-guiding medium 16 is less than or equal to the side length of the bottom surface of the cavity 153.

[0076] At this time, the light guiding medium 16 can be placed into the cavity 153 to achieve a good light guiding effect.

[0077] As an optional implementation, Figure 3-6 As shown, the light guide medium 16 and the plurality of lithium glass scintillator columns 10 can be connected by gap fit. At this time, the light guide medium 16 and the plurality of lithium glass scintillator columns 10 are closely matched to ensure the stability of the structure and improve the light guide effect.

[0078] Or, as another optional implementation, such as Figure 7 As shown, the light guide medium 16 and the plurality of lithium glass scintillator columns 10 may be provided with mutually matching mortise and tenon structures 18, and the light guide medium 16 and the plurality of lithium glass scintillator columns 10 are connected via the mortise and tenon structures 18. At this time, the mortise and tenon structures 18 may also be used to achieve a tight connection between the light guide medium 16 and the plurality of lithium glass scintillator columns 10, thereby ensuring the stability of the structure and improving the light guide effect.

[0079] The scintillator assembly 100 of the embodiment of the present application can be used in environmental detection fields such as oil logging, such as neutron logging, but is not limited thereto. The large-sized scintillator assembly 100 obtained by splicing a plurality of small-sized lithium glass scintillator columns 10 effectively increases the surface area of ​​the incident surface of the radiation, thereby effectively increasing the detection efficiency of the lithium glass scintillator. Among them, the hollow structure design is adopted to make the wall thickness of the lithium glass scintillator thinner, so as to avoid the lithium glass scintillator being too thick and affecting the energy resolution of neutrons and gamma rays, thereby ensuring the accuracy of detection. And a light-guiding medium 16 can be added to the hollow cavity 153 to further improve the discrimination effect of neutron peaks and gamma peaks. The solution of the embodiment of the present application solves the problem of limitations caused by the small size of existing lithium glass.

[0080] Embodiment 2

[0081] like Figure 8 As shown, the embodiment of the present application further provides a scintillator packaging structure, including the scintillator assembly 100 as described above, and further including:

[0082] The housing 200, the scintillator assembly 100 is encapsulated in the housing 200; wherein, an optical window 21 is provided at one end of the housing 200, and a rear end cover 22 is provided at the other end; the light emitting surface of the scintillator assembly 100 is connected to the optical window 21, and the end face of the second end 152 is connected to the rear end cover 22.

[0083] At this time, the large-sized scintillator assembly 100 obtained by splicing a plurality of thin and long lithium glass scintillator columns 10 is encapsulated in a housing 200, and the housing 200 can shield and protect the scintillator columns 10. An optical window 21 is provided on the housing 200, and the light-emitting surface of the scintillator assembly 100, that is, the front end surfaces 11 of the plurality of lithium glass scintillator columns 10, is connected to the optical window 21. The light emitted by the scintillator assembly 100 excited by the radiation rays can pass through the optical window 21 through the light-emitting surface to achieve the purpose of detection.

[0084] The scintillator packaging structure of the embodiment of the present application, the scintillator assembly 100 uses a large-sized lithium glass scintillator obtained by splicing a plurality of small-sized lithium glass scintillator columns 10, which effectively increases the surface area of ​​the incident surface of the radiation, thereby effectively increasing the detection efficiency of the lithium glass scintillator. Among them, the hollow structure design is adopted to make the wall thickness of the lithium glass scintillator thinner, so as to avoid the lithium glass scintillator being too thick and affecting the energy resolution of neutrons and gamma rays, thereby ensuring the accuracy of detection. And the light-guiding medium 16 can be embedded in the hollow cavity 153 to further improve the discrimination effect of neutron peaks and gamma peaks. The solution of the embodiment of the present application solves the problem of limitations caused by the small size of existing lithium glass.

[0085] The housing 200 may be made of metal, such as stainless steel or titanium alloy, to ensure the firmness and reliability of the housing 200 , but is not limited thereto.

[0086] Optionally, the light emitting surface of the scintillator assembly 100 is coupled to the optical window 21 via an optical coupling medium 17. At this time, the optical coupling medium 17 can fill a small gap between the light emitting surface of the scintillator assembly 100 and the optical window 21 to avoid light loss.

[0087] Among them, when a light-guiding medium 16 is set in the cavity 153, the light-emitting surface of the scintillator assembly 100 theoretically includes the front end face 11 of the lithium glass scintillator column 10 and the end face of the light-guiding medium 16. The front end face 11 of the lithium glass scintillator column 10 and the optical window 21, as well as the light-guiding medium 16 and the optical window 21 can be coupled respectively through the optical coupling medium 17 to fill the gap and avoid light loss.

[0088] The optical coupling medium 17 may be a high temperature resistant elastic coupling medium silicone gel with high optical transmittance, but is not limited thereto.

[0089] Optionally, a rear light reflection layer 23 is disposed between the end surface of the second end 152 of the scintillator assembly 100 and the rear end cover 22. At this time, the rear light reflection layer 23 can reflect light to avoid light loss.

[0090] Among them, when a light-guiding medium 16 is set in the cavity 153, the end face of the second end 152 of the scintillator assembly 100 theoretically includes the rear end face 12 of the lithium glass scintillator column 10 and the end face of the light-guiding medium 16, and the rear end light reflecting layer 23 can simultaneously cover the rear end face 12 of the lithium glass scintillator column 10 and the end face of the light-guiding medium 16 to avoid light loss.

[0091] Optionally, a side light reflection layer 24 is provided between the outer side surface of the scintillator assembly 100 and the housing 200 to reflect light and avoid light loss.

[0092] The rear light reflection layer 23 and the side light reflection layer 24 may be made of a white diffuse reflection layer, such as a polytetrafluoroethylene film, or a mirror reflection film, such as an aluminum coating, aluminum foil, etc., but are not limited thereto.

[0093] Optionally, a rear vibration reduction layer 25 is further provided between the rear light reflection layer 23 and the rear cover 22 ; and a side vibration reduction layer 26 is further provided between the side light reflection layer 24 and the housing 200 .

[0094] At this time, by respectively providing vibration-damping layers between the rear light reflection layer 23 and the rear cover 22 , and between the side light reflection layer 24 and the housing 200 , the vibration and impact resistance of the overall scintillator packaging structure can be improved.

[0095] The rear vibration damping layer 25 and the side vibration damping layer 26 may be made of elastic vibration damping materials. Specifically, the side vibration damping layer 26 may be made of high temperature resistant elastic rubber, and the rear vibration damping layer 25 may be made of rubber pads or spring pads, but is not limited thereto.

[0096] The rear end cover 22 and the housing 200 can be sealed by laser welding to further improve the vibration and impact resistance of the overall scintillator packaging structure. Figure 8 As shown, the laser welding point 27 between the rear end cover 22 and the housing 200 can improve the vibration and impact resistance.

[0097] A specific application example of the embodiment of the present application is illustrated below.

[0098] like Figure 8As shown, the embodiment of the present application provides a large-size lithium glass scintillator packaging structure applicable to the field of oil well logging, which is composed of a metal shell 200 and a scintillator assembly 100, and the scintillator assembly 100 is encapsulated in the shell 200. The scintillator assembly 100 is spliced ​​by a plurality of small-size lithium glass scintillator columns 10, and a quartz glass light-guiding medium 16 is embedded in the cavity 153. The shell 200 includes an optical window 21 and a rear end cover 22. The light-emitting surface of the scintillator assembly 100 is connected to the optical window 21, wherein the light-emitting surface of the scintillator assembly 100 and the optical window 21 are coupled through an optical coupling medium 17. The end face of the second end 152 of the scintillator assembly 100 is connected to the rear end cover 22, and a rear end light reflection layer 23 and a rear end shock absorption layer 25 are sequentially arranged between the end face of the second end 152 of the scintillator assembly 100 and the rear end cover 22. A side light reflection layer 24 and a side shock absorption layer 26 are sequentially arranged between the outer side surface of the scintillator assembly 100 and the shell 200.

[0099] The scintillator packaging structure of the embodiment of the present application, the scintillator assembly 100 is made of a plurality of small-sized lithium glass scintillator columns 10, which effectively increases the surface area of ​​the incident surface of the radiation, thereby effectively increasing the detection efficiency of the lithium glass scintillator. And the hollow structure design is adopted, so that the wall thickness of the lithium glass scintillator is thinner, and the light-guiding medium 16 can be embedded in the hollow cavity 153, which effectively improves the discrimination effect of the neutron peak and the gamma peak. The solution of the embodiment of the present application solves the problem of limitations caused by the small size of the existing lithium glass. And the packaging structure of the embodiment of the present application has strong vibration and impact resistance and good stability.

[0100] It should be noted that the scintillator assembly involved in the embodiment of the present application has the same technical features as the above-mentioned scintillator assembly embodiment and can achieve the same technical effects. To avoid repetition, it will not be described again here.

[0101] Embodiment 3

[0102] The embodiment of the present application further provides a detector, including a photomultiplier tube, and also including: the scintillator packaging structure as described above, wherein the optical window of the scintillator packaging structure is coupled to the photomultiplier tube via an optical coupling medium.

[0103] In the detector of the embodiment of the present application, the scintillator assembly 100 in the scintillator packaging structure is formed by splicing a plurality of small-sized lithium glass scintillator columns 10, which effectively increases the surface area of ​​the incident surface of the radiation, thereby effectively increasing the detection efficiency of the lithium glass scintillator. The hollow structure design is adopted, so that the wall thickness of the lithium glass scintillator is relatively thin, and the light-guiding medium 16 can be embedded in the hollow cavity 153, which effectively improves the discrimination effect of the neutron peak and the gamma peak. The solution of the embodiment of the present application solves the problem of limitation caused by the small size of the existing lithium glass.

[0104] It should be noted that the scintillator packaging structure involved in the embodiment of the present application has the same technical features as the above-mentioned scintillator packaging structure embodiment and can achieve the same technical effects. To avoid repetition, it will not be described again here.

[0105] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0106] Although the preferred embodiments of the present invention have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the embodiments of the present invention.

[0107] Finally, it should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or terminal device including the elements.

[0108] The embodiments of the present application are described above in conjunction with the accompanying drawings, but the present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present application, ordinary technicians in this field can also make many forms without departing from the purpose of the present application and the scope of protection of the claims, all of which are within the protection of the present application.

Claims

1. A scintillator assembly, characterized in that: include: A plurality of lithium glass scintillator columns, each of which comprises a front end face, a rear end face, an inner side face and an outer side face; A plurality of the lithium glass scintillator columns are spliced ​​into a hollow columnar structure; Wherein, the front end face of each of the lithium glass scintillator columns is respectively located at the first end of the columnar structure, and the rear end face is respectively located at the second end of the columnar structure; the first end face of the columnar structure serves as the light emitting surface of the scintillator assembly; The inner side surface of each of the lithium glass scintillator columns faces the inner side of the columnar structure, and the outer side surface faces the outer side of the columnar structure; the outer side surface of the columnar structure serves as the radiation incident surface of the scintillator assembly; The inner side surfaces of the plurality of lithium glass scintillator columns surround and form a hollow cavity in the columnar structure.

2. The scintillator assembly according to claim 1, characterized in that: A light-guiding medium is arranged in the cavity.

3. The scintillator assembly according to claim 2, characterized in that: The cavity is in the shape of a regular prism; The light-guiding medium is in the shape of a regular prism matched with the cavity, and the side length of the bottom surface of the light-guiding medium is less than or equal to the side length of the bottom surface of the cavity.

4. The scintillator assembly according to claim 2 or 3, characterized in that: The light-guiding medium and the plurality of lithium glass scintillator columns are connected by gap fitting; or The light-guiding medium and the plurality of lithium glass scintillator columns are respectively provided with mortise and tenon structures that cooperate with each other, and the light-guiding medium and the plurality of lithium glass scintillator columns are connected through the mortise and tenon structures.

5. The scintillator assembly according to claim 2 or 3, characterized in that: The light-guiding medium is optical glass or optical silicone gel light guide.

6. The scintillator assembly according to any one of claims 1 to 3, characterized in that: The cross section of the lithium glass scintillator column is trapezoidal or rectangular.

7. The scintillator assembly according to any one of claims 1 to 3, characterized in that: The thickness between the inner side and the outer side of the lithium glass scintillator column is less than or equal to 3 mm.

8. The scintillator assembly according to claim 2 or 3, characterized in that: The light-guiding medium is coupled to the plurality of lithium glass scintillator columns via an optical coupling medium; Two adjacent lithium glass scintillator columns are coupled via an optical coupling medium.

9. A scintillator packaging structure, characterized in that: The scintillator assembly according to any one of claims 1 to 8, further comprising: The scintillator assembly is encapsulated in the shell; wherein an optical window is provided at one end of the shell, and a rear end cover is provided at the other end; the light emitting surface of the scintillator assembly is connected to the optical window, and the second end surface is connected to the rear end cover.

10. The scintillator packaging structure according to claim 9, characterized in that: The light emitting surface of the scintillator assembly is coupled to the optical window via an optical coupling medium, and a rear light reflecting layer is provided between the second end surface and the rear end cover; A side light reflecting layer is arranged between the outer side surface of the scintillator assembly and the outer shell.

11. The scintillator packaging structure according to claim 10, characterized in that: A rear vibration reduction layer is also provided between the rear light reflection layer and the rear cover; A side vibration reduction layer is also arranged between the side light reflecting layer and the shell.

12. A detector comprising a photomultiplier tube, characterized in that: Also includes: According to any one of claims 9 to 11, the optical window of the scintillator packaging structure is coupled to the photomultiplier tube via an optical coupling medium.

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