Gamma compensated neutron imaging detector based on linear array detector

Abstract

The utility model discloses a neutron imaging detector with gamma compensation based on a linear array detector, which comprises a PCB (printed circuit board), a fixing plate and a scintillator layer, and is characterized in that the fixing plate is positioned on the PCB and is used for fixing the scintillator layer; a pixel acquisition layer is arranged between the scintillator layer and the mounting part of the fixed plate; high-precision signal acquisition is realized by taking linear array photodiodes in one-dimensional arrangement as a pixel acquisition layer, a scintillator layer is formed by alternately distributing and mutually fitting a plurality of pieces of 6LiF glass and 7LiF glass, one photodiode is arranged below each of the 6LiF glass and the 7LiF glass, and a shading layer is arranged between the 6LiF glass and the 7LiF glass; as the 6LiF glass and the 7LiF glass are the same in area and thickness, the intensity of X-rays and gamma-rays in the 6LiF glass and the 7LiF glass is the same, neutrons, the X-rays and the gamma-rays can be detected by matching the 6LiF glass with the photodiode, and only the X-rays and the gamma-rays can be detected by matching the 7LiF glass with the photodiode, so that the X-rays and the gamma-rays can be deducted by subtracting detection data of the 6LiF glass and the 7LiF glass. The purpose of neutron detection imaging is achieved.

Description

Technical Field

[0001] This utility model belongs to the field of neutron detector technology, specifically relating to a neutron imaging detector with gamma compensation based on a linear array detector. Background Technology

[0002] Traditional neutron imaging detectors typically employ a single neutron-sensitive layer structure, which is susceptible to gamma-ray interference in mixed radiation fields, leading to a significant reduction in the signal-to-noise ratio of the imaging signal. Existing methods for suppressing gamma noise through physical shielding or electronic discrimination suffer from sensitivity loss or high system complexity. Therefore, subtracting gamma interference, especially in integral imaging research, is a technical challenge in identifying and subtracting X-rays and gamma rays. Linear array detectors based on lithium isotope neutron conversion layers use an accumulation method to achieve neutron imaging testing, but they cannot effectively eliminate X-ray and gamma-ray interference, greatly reducing the effectiveness of this technology and rendering it unsuitable for application. Therefore, it is necessary to design a neutron imaging detector that effectively subtracts X-ray and gamma-ray interference. Utility Model Content

[0003] The purpose of this invention is to provide a neutron imaging detector with gamma compensation based on a linear array detector. The linear array detector uses one-dimensionally arranged linear photodiodes as independent detection units, i.e., the pixel acquisition layer, to achieve high-precision signal acquisition. The scintillator layer consists of several... 6 LiF glass and 7 LiF glass is arranged in an alternating and bonded configuration, and 6 LiF glass and 7 A photodiode is placed beneath each LiF glass. 6 LiF glass and 7 A light-shielding layer is placed between the LiF glass panes to prevent light from crossing between them; because 6 LiF glass and 7 LiF glass has the same area and thickness, therefore 6 LiF glass and 7 The intensity of X-rays and gamma rays is the same in LiF glass. 6 LiF glass combined with photodiodes can detect neutrons, X-rays, and gamma rays, while 7 LiF glass paired with a photodiode can only detect X-rays and gamma rays. Therefore, subtracting the detection data from the photodiode can achieve the subtraction of X-rays and gamma rays, thus achieving the purpose of neutron detection imaging.

[0004] This utility model is achieved through the following technical solution:

[0005] A neutron imaging detector with gamma compensation based on a linear array detector includes a PCB board, a mounting plate, and a scintillator layer. The mounting plate includes a fixing part and a mounting part, which are arranged perpendicularly to each other. The fixing part is used to connect to the PCB board, and the mounting part is used to mount the scintillator layer. A pixel acquisition layer and an adhesive layer are disposed between the scintillator layer and the mounting part of the mounting plate. The pixel acquisition layer is connected to the mounting part, and the scintillator layer and the pixel acquisition layer are bonded and fixed together by the adhesive layer.

[0006] Furthermore, the scintillator layer includes several 6 LiF glass and 7 LiF glass, the 6 LiF glass and 7 LiF glass has a rectangular structure of equal size, the aforementioned 6 LiF glass and 7 The number of LiF glasses is the same, the 6 LiF glass and 7 The LiF glass is arranged in a straight line, alternating with each other, and is attached to the fixed plate.

[0007] Furthermore, the aforementioned 6 LiF glass and 7 A light-shielding layer is placed between the LiF glass panes.

[0008] Furthermore, the light-shielding layer is made of a metallic material and has a thickness of 2μm-3μm.

[0009] Furthermore, a magnesium oxide light-shielding layer is provided on the surface of the scintillator layer.

[0010] Furthermore, the thickness of the magnesium oxide light-shielding layer is 10μm-30μm.

[0011] Furthermore, the pixel acquisition layer includes a plurality of photodiodes whose sides are attached to each other, and each photodiode has a corresponding [missing information - likely a number]. 6 LiF glass or 7 LiF glass.

[0012] Furthermore, the fixing part of the fixing plate is provided with a set of mounting holes, which are used to install the fixing plate.

[0013] Compared with the prior art, this utility model has the following advantages and beneficial effects:

[0014] In this invention, a linear array detector uses one-dimensionally arranged linear photodiodes as independent detection units, i.e., the pixel acquisition layer, to achieve high-precision signal acquisition. The scintillator layer consists of several... 6 LiF glass and 7 The LiF glass is arranged in an alternating and bonded configuration.6 LiF glass and 7 A photodiode is placed beneath each LiF glass. 6 LiF glass and 7 A light-shielding layer is placed between the LiF glass panes to prevent light from crossing between them; because 6 LiF glass and 7 LiF glass has the same area and thickness, therefore 6 LiF glass and 7 The intensity of X-rays and gamma rays is the same in LiF glass. 6 LiF glass combined with photodiodes can detect neutrons, X-rays, and gamma rays, while 7 LiF glass paired with a photodiode can only detect X-rays and gamma rays. Therefore, subtracting the detection data from the photodiodes can achieve the subtraction of X-rays and gamma rays, thus achieving the purpose of neutron detection imaging. Attached Figure Description

[0015] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings in the embodiments will be briefly described below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the assembly structure of the gamma-compensated neutron imaging detector based on a linear array detector according to this utility model.

[0017] Figure 2 This is a cross-sectional view of the assembly structure of the scintillator layer and the pixel acquisition layer in this utility model.

[0018] Wherein: 1-PCB board, 2-fixing board, 21-fixing part, 22-mounting part, 3-pixel acquisition layer, 31-photodiode, 4-scintillator layer, 41- 6 LiF glass, 42- 7 LiF glass, 43-light-shielding layer, 44-magnesium oxide light-shielding layer, 5-adhesive layer. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some embodiments of this utility model, but not all embodiments.

[0020] Example 1:

[0021] A gamma-compensated neutron imaging detector based on a linear array detector, such as Figure 1 and Figure 2 As shown, the system includes a PCB board 1, a fixing plate 2, and a scintillator layer 4. The fixing plate 2 includes a fixing part 21 and a mounting part 22. The fixing plate 2 has an L-shaped structure, and the fixing part 21 and the mounting part 22 are arranged perpendicularly to each other. The fixing part 21 is used to connect the PCB board 1 and has a set of mounting holes. The fixing plate 2 is fixed to the PCB board 1 by bolts that cooperate with the mounting holes. The mounting part 22 is used to set the scintillator layer 4, which is located on the side of the mounting part 22. A pixel acquisition layer 3 and an adhesive layer 5 are provided between the scintillator layer 4 and the mounting part 22 of the fixing plate 2. The pixel acquisition layer 3 is connected to the mounting part 22, and the scintillator layer 4 and the pixel acquisition layer 3 are bonded and fixed by the adhesive layer 5. The adhesive layer 5 is preferably made of epoxy resin, which has adhesiveness and light transmittance. A magnesium oxide light-shielding layer 44 is provided on the surface of the scintillator layer 4 to avoid external light interference. The thickness of the magnesium oxide light-shielding layer 44 is 20 μm.

[0022] Example 2:

[0023] This embodiment, based on the above embodiment, further defines the scintillator layer 4 and the pixel acquisition layer 3, such as... Figure 2 As shown, scintillator layer 4 includes several 6 LiF (lithium fluoride 6) glass 41 and 7 LiF (lithium fluoride 7) glass 42, 6 LiF glass 41 and 7 All LiF glass 42 are of equal size and have a rectangular structure. 6 LiF glass 41 and 7 The number of LiF glass 42 is the same. 6 LiF glass 41 and 7 The LiF glass 42s are arranged in a straight, alternating pattern on the fixing plate 2 and are fitted together. 6 LiF glass 41 bonded to one 7 One of the LiF glass 42, 7 The other side of the LiF glass 42 is attached to another... 6 LiF glass 41 is arranged alternately in sequence; and in 6 LiF glass 41 and 7 A light-shielding layer 43 is disposed between the LiF glass 42; the light-shielding layer 43 is made of copper and has a thickness of 2μm; the pixel acquisition layer 3 includes a number of photodiodes 31 whose sides are attached to each other, the number of photodiodes 31 being equal to the number of photodiodes 31. 6 LiF glass 41 and 7 The total number of LiF glass 42 is the same, and one photodiode 31 is correspondingly provided on each photodiode 31. 6 LiF glass 41 or7 LiF glass 42; due to 6 LiF glass 41 and 7 The area and thickness of LiF glass 42 are the same, therefore 6 LiF glass 41 and 7 The X-ray and gamma-ray intensities are the same in LiF glass 42. 6 LiF glass 41 paired with photodiode 31 can detect neutrons, X-rays, and gamma rays, while 7 The LiF glass 42 paired with the photodiode 31 can only detect X-rays and gamma rays. Therefore, subtracting the final detection data from the photodiode 31 can achieve the subtraction of X-rays and gamma rays, thus achieving the purpose of neutron detection imaging. The other parts of this embodiment are the same as those in the above embodiments, and will not be repeated here.

[0024] In the description of this utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", and "outer" used to indicate the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship that the utility model product is usually placed in during use. They are only used to facilitate the description of this utility model and to simplify the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0025] Furthermore, the use of terms such as "horizontal" or "vertical" in the description of this utility model does not imply that the component is required to be absolutely horizontal or suspended, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0026] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0027] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Any simple modifications or equivalent changes made to the above embodiments based on the technical essence of the present utility model shall fall within the protection scope of the present utility model.

Claims

1. A neutron imaging detector with gamma compensation based on a linear array detector, characterized in that, The device includes a PCB board, a fixing plate, and a scintillator layer. The fixing plate includes a fixing part and a mounting part, which are arranged perpendicularly to each other. The fixing part is used to connect the PCB board, and the mounting part is used to set the scintillator layer. A pixel acquisition layer and an adhesive layer are provided between the scintillator layer and the mounting part of the fixing plate. The pixel acquisition layer is connected to the mounting part, and the scintillator layer and the pixel acquisition layer are bonded and fixed together by the adhesive layer.

2. The gamma-compensated neutron imaging detector based on a linear array detector as described in claim 1, characterized in that, The scintillator layer includes several 6 LiF glass and 7 LiF glass, the 6 LiF glass and 7 LiF glass has a rectangular structure of equal size, the aforementioned 6 LiF glass and 7 The number of LiF glasses is the same, the 6 LiF glass and 7 The LiF glass is arranged in a straight line, alternating with each other, and is attached to the fixed plate.

3. The gamma-compensated neutron imaging detector based on a linear array detector as described in claim 2, characterized in that, The 6 LiF glass and 7 A light-shielding layer is placed between the LiF glass panes.

4. The gamma-compensated neutron imaging detector based on a linear array detector as described in claim 3, characterized in that, The light-shielding layer is made of metal material and has a thickness of 2μm-3μm.

5. The gamma-compensated neutron imaging detector based on a linear array detector as described in claim 1, characterized in that, The surface of the scintillator layer is provided with a magnesium oxide light-shielding layer.

6. The gamma-compensated neutron imaging detector based on a linear array detector as described in claim 5, characterized in that, The thickness of the magnesium oxide light-shielding layer is 10μm-30μm.

7. The gamma-compensated neutron imaging detector based on a linear array detector as described in claim 2, characterized in that, The pixel acquisition layer includes several photodiodes whose sides are attached to each other, and each photodiode has a corresponding photodiode. 6 LiF glass or 7 LiF glass.

8. The gamma-compensated neutron imaging detector based on a linear array detector as described in claim 1, characterized in that, The fixing part of the fixing plate is provided with a set of mounting holes, which are used to install the fixing plate.

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