Nuclear radiation detector composed of PMMA light guide

Abstract

A nuclear radiation detector composed of a PMMA light guide comprises a PMMA light guide plate, a scintillator plate, an optical coupling silica gel layer and a photomultiplier, and is characterized in that the PMMA light guide plate and the scintillator plate are connected through the optical coupling silica gel layer, and the scintillator plate is arranged on the top surface of the PMMA light guide plate; an embedded groove is formed in the PMMA light guide plate; the photomultiplier is installed in the embedded groove and located on one side of the PMMA light guide plate, and an optical coupling silicone grease layer is arranged between the photomultiplier and the embedded groove; according to the device, light attenuation can be greatly reduced, far-end light collection is increased, overall consistency is improved, and alpha and beta detection efficiency is improved; the dead zone light loss can be reduced, the light collection efficiency is improved, the detection efficiency of the tail end is improved, the overall consistency is further improved, and the alpha and beta detection efficiency is further improved; according to the invention, the overall dimension of the detector assembly can be reduced, the distance from the detector assembly to the far end is also increased, the light collection efficiency is improved, and the overall consistency and the alpha-beta detection efficiency are further improved.

Description

Technical Field

[0001] The utility model relates to the technical field of detectors, in particular to a nuclear radiation detector composed of a PMMA light guide. Background Art

[0002] Alpha-beta detectors are instruments or devices used to detect alpha particles and beta particles.

[0003] Most of the existing large-area alpha-beta detectors adopt cavity-type devices. This type of device uses air to conduct light, and there is no coupling between the photomultiplier tubes. The light collection efficiency is low, and the consistency of each point on the detection surface is poor, resulting in low alpha-beta efficiency. Moreover, since the scintillator is a 0.5-mm thick sheet, the sheet will bend and deform after long-term use. Content of the Utility Model

[0004] The technical problem to be solved by the utility model is to provide a nuclear radiation detector composed of a PMMA light guide, which can effectively solve the problems raised in the above background art.

[0005] To solve the above problems, the technical solution adopted by the utility model is: a nuclear radiation detector composed of a PMMA light guide, including a PMMA light guide plate, a scintillator plate, an optical coupling silica gel layer, and a photomultiplier tube. It is characterized in that the PMMA light guide plate is connected to the scintillator plate through the optical coupling silica gel layer, and the scintillator plate is arranged on the top surface of the PMMA light guide plate; an embedded groove is arranged inside the PMMA light guide plate; the photomultiplier tube is installed in the embedded groove, the photomultiplier tube is located on one side of the PMMA light guide plate, and an optical coupling silicone grease layer is arranged between the photomultiplier tube and the embedded groove.

[0006] As a further preferred solution of the utility model, it further includes a housing, a photomultiplier tube socket, a high-voltage circuit board, an amplifier circuit board, a distribution board, and an outlet gland; the photomultiplier tube socket is sleeved on the photomultiplier tube; the PMMA light guide plate, the high-voltage circuit board, the amplifier circuit board, and the distribution board are installed inside the housing, and the distribution board is welded to the photomultiplier tube socket; the outlet gland is embedded on one side of the housing; the cables of the high-voltage circuit board, the amplifier circuit board, and the distribution board are led out from the outlet gland.

[0007] As a further preferred solution of the utility model, the optical coupling silica gel layer adopts HT-SL600 optical coupling silica gel.

[0008] As a further preferred solution of the utility model, the optical coupling silicone grease layer adopts HT-SL612 optical coupling silicone grease.

[0009] As a further preferred solution of the utility model, the edge of the PMMA light guide plate adopts a chamfer design.

[0010] As a further preferred solution of the present utility model, it further includes a film covering frame; the film covering frame is sleeved on the outer shell.

[0011] Compared with the prior art, the present utility model provides a nuclear radiation detector composed of a PMMA light guide, having the following beneficial effects:

[0012] The device enables the scintillation light to be transmitted by a PMMA light guide with a light transmittance greater than 97%, greatly reducing light attenuation, increasing light collection at the distal end, improving overall consistency, and improving αβ detection efficiency; chamfering is performed on the dead angle of the PMMA light guide to reduce dead zone light loss and improve light collection efficiency. At the same time, the detection efficiency at the end is increased, further improving overall consistency and further improving αβ detection efficiency. The photomultiplier tube adopts an embedded technology, which not only reduces the overall external dimension of the detector assembly but also shortens the distance to the distal end. The optical coupling silicone grease couples the photomultiplier tube and the PMMA light guide together, improving light collection efficiency, and further improving overall consistency and αβ detection efficiency. Description of the Drawings

[0013] Figure 1 It is a schematic structural diagram of a PMMA light guide plate assembly;

[0014] Figure 2 is Figure 1 the schematic sectional view of the structure in

[0015] Figure 3 is Figure 2 the enlarged schematic diagram of the structure of label C in

[0016] Figure 4 It is a partial schematic diagram of the structure of the present utility model;

[0017] Figure 5 is Figure 4 the schematic sectional view of the structure in

[0018] Figure 6 It is a partial schematic diagram of the structure of the present utility model;

[0019] Wherein: 1. PMMA light guide plate; 2. Scintillator plate; 3. Optical coupling silicone layer; 4. Embedded groove; 5. Photomultiplier tube; 6. Chamfer; 7. Optical coupling silicone grease layer; 8. Photomultiplier tube socket; 9. Sub-distribution board; 10. High-voltage circuit board; 11. Amplification circuit board; 12. Outgoing cable gland; 13. Outer shell; 14. Film covering frame; Detailed Embodiments

[0020] It should be noted that if there are directional indications (such as up, down, left, right, front, back...) involved in the embodiments of the present utility model, the directional indications are only used to explain the relative positional relationship, movement conditions, etc. between components in a certain specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0021] In addition, if there are descriptions such as "first", "second", etc. involved in the embodiments of the present utility model, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly specifying the quantity of the indicated technical features.

[0022] In addition, if "and / or" or "and / or" appears throughout the text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, or solution B, or a solution where A and B are satisfied simultaneously.

[0023] In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the fact that those skilled in the art can implement them. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

[0024] Referring to Figures 1-3 , the present utility model provides a nuclear radiation detector composed of a PMMA light guide, including a PMMA light guide plate 1, a scintillator plate 2, an optical coupling silica gel layer 3, and a photomultiplier tube 5. It is characterized in that the scintillator plate 2 is a plastic scintillator sheet; the PMMA light guide plate 1 and the scintillator plate 2 are connected through the optical coupling silica gel layer 3, wherein the scintillator plate 2 is arranged on the top surface of the PMMA light guide plate 1; an embedded groove 4 is arranged inside the PMMA light guide plate 1; the photomultiplier tube 5 is installed in the embedded groove 4, the photomultiplier tube 5 is located on one side of the PMMA light guide plate 1, and an optical coupling silicone grease layer 7 is arranged between the photomultiplier tube 5 and the embedded groove 4.

[0025] Referring to Figures 4-6 , as a further preferred solution of the present utility model, it further includes a housing 13, a photomultiplier tube socket 8, a high-voltage circuit board 10, an amplifier circuit board 11, a distribution board 9, and an outlet gland 12; the photomultiplier tube socket 8 is sleeved with the photomultiplier tube 5; the PMMA light guide plate 1, the high-voltage circuit board 10, the amplifier circuit board 11, and the distribution board 9 are installed inside the housing 13, and the distribution board 9 is welded to the photomultiplier tube socket 8; the outlet gland 12 is embedded on one side of the housing 13; the cables of the high-voltage circuit board 10, the amplifier circuit board 11, and the distribution board 9 are led out from the outlet gland 12.

[0026] As a further preferred embodiment of the present utility model, the optical coupling silica gel layer 3 adopts HT-SL600 optical coupling silica gel to improve the light transmittance.

[0027] As a further preferred embodiment of the present utility model, the optical coupling silicone grease layer 7 adopts HT-SL612 or HT-SL610 optical coupling silicone grease.

[0028] As a further preferred embodiment of the present utility model, the edge of the PMMA light guide plate 1 is designed with a chamfer 6 to improve the light collection efficiency, increase the detection efficiency at the end, and improve the overall consistency.

[0029] As a further preferred embodiment of the present utility model, it further includes a film covering frame 14; the film covering frame 14 is sleeved on the outer shell 13.

[0030] As a specific embodiment of the present utility model: The PMMA light guide material is processed into the shape of the PMMA light guide plate 1 and milled with a chamfer into the style of chamfer 6, and then polished as a whole;

[0031] The plastic scintillator sheet is cut into the shape of the scintillator plate 2;

[0032] A layer of optical coupling silica gel layer 3 is laid flat on the PMMA light guide plate 1 and then put into a vacuum chamber to evacuate until there are no bubbles in the optical coupling silica gel layer 3;

[0033] Take out a scintillator plate 2 and place it on the optical coupling silica gel layer 3, and then continue to evacuate until there are no bubbles between the scintillator plate 2 and the optical coupling silica gel layer 3, and then take it out;

[0034] Let it stand for 12 hours to solidify the optical coupling silica gel layer 3, so that the scintillator 2 and the PMMA light guide plate 1 are bonded and not easily bent and deformed, improving the toughness;

[0035] At this time, the optical coupling silica gel layer 3 bonds and couples the PMMA light guide plate 1 and the scintillator plate 2 together;

[0036] The distribution board 9 is welded to the photomultiplier tube socket 8 and the cable is welded well;

[0037] The photomultiplier tube socket 8 welded with the distribution board 9 is installed on the photomultiplier tube 5;

[0038] After cleaning the embedded groove 4, apply a layer of optical coupling silicone grease layer 7 in the embedded groove 4, and then install the photomultiplier tube 5 installed with the distribution board 9 and the photomultiplier tube socket 8;

[0039] During the whole operation process, it is necessary to ensure that there are no bubbles and impurities between the PMMA light guide plate 1 and the scintillator plate 2;

[0040] The outlet gland 12 is installed on the outer shell 13;

[0041] Install the high-voltage circuit board 10 on the housing 13 and weld the cables well;

[0042] Install the amplifier circuit board 11 on the housing 13 and weld the cables well;

[0043] Put the previously assembled PMMA light guide component into the housing 13 and fix it with glue;

[0044] Connect the cables of the distribution board 9, high-voltage circuit board 10, and amplifier circuit board 11 and lead them out from the outlet gland 12;

[0045] Fix two layers of 2-μm-thick Mylar film on the film covering frame 14 with glue, and ensure that the film has no wrinkles or damages;

[0046] Lock the outlet gland 12 and install the film covering frame 14 on the housing 13;

[0047] So far, the overall component assembly is completed, and relevant tests can be carried out later (test whether the electronics is normal, test whether the film leaks light, test whether the connection part leaks light, test the overall detection efficiency, test the overall uniformity).

[0048] As needed, the installation, setting, providing, or connection methods described above include but are not limited to installation, setting, or connection by means such as screws, riveting, welding, or socketing, fixing, etc., and the installation, setting, or connection methods are selected according to the working scenario requirements.

[0049] The above are only the preferred embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. Any equivalent structural transformation made under the inventive concept of the present invention by using the content of the specification and drawings of the present invention, or any direct / indirect application in other related technical fields is included in the patent protection scope of the present invention.

Claims

1. A nuclear radiation detector composed of PMMA light guide, comprising a PMMA light guide plate (1), a scintillator plate (2), an optical coupling silicone layer (3) and a photomultiplier tube (5), characterized in that: The PMMA light guide plate (1) and the scintillator plate (2) are connected via an optical coupling silicone layer (3), wherein the scintillator plate (2) is arranged on the top surface of the PMMA light guide plate (1); an embedded groove (4) is arranged inside the PMMA light guide plate (1); the photomultiplier tube (5) is installed in the embedded groove (4), the photomultiplier tube (5) is located on one side of the PMMA light guide plate (1), and an optical coupling silicone grease layer (7) is arranged between the photomultiplier tube (5) and the embedded groove (4).

2. The nuclear radiation detector composed of PMMA light guide according to claim 1, characterized in that: The invention also comprises a housing (13), a photomultiplier tube base (8), a high-voltage circuit board (10), an amplifying circuit board (11), a voltage dividing plate (9) and an outlet Gland head (12); the photomultiplier tube base (8) is sleeved with the photomultiplier tube (5); the PMMA light guide plate (1), the high-voltage circuit board (10), the amplifying circuit board (11) and the voltage dividing plate (9) are installed inside the housing (13), and the voltage dividing plate (9) is welded to the photomultiplier tube base (8); the outlet Gland head (12) is embedded in one side of the housing (13); and the cables of the high-voltage circuit board (10), the amplifying circuit board (11) and the voltage dividing plate (9) are led out from the outlet Gland head (12).

3. The nuclear radiation detector composed of PMMA light guide according to claim 1, characterized in that: The optical coupling silicone layer (3) is made of HT-SL600 optical coupling silicone.

4. The nuclear radiation detector composed of PMMA light guide according to claim 1, characterized in that: The optical coupling silicone grease layer (7) adopts HT-SL612 optical coupling silicone grease.

5. The nuclear radiation detector composed of PMMA light guide according to claim 1, characterized in that: The edge of the PMMA light guide plate (1) is designed with a chamfer (6).

6. The nuclear radiation detector composed of PMMA light guide according to claim 2, characterized in that: It also comprises a film covering frame (14); the film covering frame (14) is sleeved on the outer shell (13).

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