CN111308539A

CN111308539A - αβ measuring instrument

Info

Publication number: CN111308539A
Application number: CN202010215389.7A
Authority: CN
Inventors: 乐爱兵; 涂德海; 张阳天; 薛斌; 刘维娟; 龙文琼; 宗忻
Original assignee: Foundmacro Co ltd
Current assignee: Foundmacro Co ltd
Priority date: 2020-03-24
Filing date: 2020-03-24
Publication date: 2020-06-19
Anticipated expiration: 2040-03-24
Also published as: CN111308539B

Abstract

An αβ measuring instrument is disclosed, the αβ measuring instrument comprising a guard comprising a first grid and a first locating element, a light-shielding element disposed adjacent to the guard comprising a fixture and at least one film layer mounted to the fixture, the fixture comprising a second grid and a second locating element, and the first grid overlapping the second grid in an orthographic projection in a direction of radiation incidence, and a seal locator comprising a securing component engaged with the first locating element and the second locating element, the securing component arranged to secure the light-shielding element and the guard in a αβ measuring instrument.

Description

αβ measuring instrument

Technical Field

The present disclosure relates to the field of nuclear radiation detection technology, and more particularly, to an αβ measuring instrument.

Background

The background description provided herein is for the purpose of generally presenting the context of the disclosure. Work of the presently named inventors, to the extent it is described in this background section, as well as aspects of the description that may not otherwise qualify as prior art at the time of filing, are neither expressly nor impliedly admitted as prior art against the present disclosure.

αβ the measuring instrument is a common nuclear radiation detecting instrument, which can measure α, β surface activity of personnel, equipment and various objects, and the detecting instrument generally adopts double-scintillation technology, and mainly comprises a shell, a protective layer, a silica gel sealing sleeve, a light shielding layer, a plastic scintillator, a photomultiplier and a hardware module.

In order to avoid the blocking of α and β rays, the middle detection area of the fixing sheet is generally designed to be hollow, so that the aluminized polyester film of the shading layer and the film fixing sheet can be only bonded through the periphery, but the problem that the flatness of the film of the shading layer detection area is poor due to insufficient bonding area, wrinkles are easy to occur in the middle part, the appearance of a detection instrument is seriously influenced, in addition, the strength of the shading layer is poor, deformation is easy, and when the shading layer is large in area, the installation manufacturability is poor due to the fact that the material is too soft, and once wrinkles or scratches are generated in the installation process, the shading layer can be scrapped integrally.

Disclosure of Invention

To overcome at least one of the above drawbacks, the present disclosure provides an αβ measuring instrument including a guard including a first grid and a first positioning element, a light shielding member disposed adjacent to the guard including a fixture and at least one film layer mounted to the fixture, the fixture including a second grid and a second positioning element, and an orthographic projection of the first grid and the second grid in a direction of radiation incidence, and a sealing positioning member including a fixing part engaged with the first positioning element and the second positioning element, the fixing part arranged to fix the light shielding member and the guard in the αβ measuring instrument.

In an embodiment of the present disclosure, the shapes of the first and second grids include a triangle, a quadrangle, a pentagon, and a hexagon.

In an embodiment of the disclosure, the first positioning element comprises at least one first recess, the second positioning element comprises at least one second recess, and the fixation part comprises at least two protrusions engaging with the first and second recesses, respectively.

In an embodiment of the disclosure, the position of the first notch relative to the first grid is the same as the position of the second notch relative to the second grid.

In an embodiment of the disclosure, the fixing member comprises a first fixing member engaged with the first positioning element and a second fixing member engaged with the second positioning element.

In an embodiment of the present disclosure, the first positioning element includes at least one hole, and the second positioning element includes at least one pin.

In an embodiment of the present disclosure, the position of the at least one hole relative to the first grid and the position of the at least one stud relative to the second grid are the same.

In an embodiment of the disclosure, the light shielding member includes two thin film layers, the two thin film layers are respectively located at two sides of the fixing member, and the thin film layers are aluminum-plated polyester films.

In an embodiment of the present disclosure, the protection element and the light shielding element are sheet-shaped structures.

In an embodiment of the present disclosure, the αβ measuring apparatus further includes a housing, a scintillator, a photomultiplier tube, and a hardware module, wherein the light-shielding member is located on a side of the scintillator away from the photomultiplier tube, the photomultiplier tube is located between the scintillator and the hardware module, and the housing accommodates therein the shielding member, the light-shielding member, the sealing and positioning member, the scintillator, the photomultiplier tube, and the hardware module of the αβ measuring apparatus.

The αβ measuring instrument of this disclosure not only obviously improves the roughness of light-proof piece, makes the instrument pleasing to the eye, has still improved the intensity of light-proof piece, has prevented its deformation in addition, the αβ measuring instrument of this disclosure has obviously improved the mounting process of light-proof piece, improves installation effectiveness and success rate, reduces the waste of time and material.

Drawings

The present disclosure will become more fully understood from the detailed description and the accompanying drawings. The drawings illustrate one or more embodiments of the disclosure and, together with the written description, serve to explain the principles of the disclosure. Wherever possible, the same reference numbers will be used throughout the drawings to refer to the same or like elements of an embodiment, and wherein:

fig. 1 is a schematic cross-sectional view of an assembled shield, light shield and sealing spacer according to an exemplary embodiment of the present invention.

Fig. 2 is an exploded perspective view of a protection member, a light-shielding member including no film, and a sealing spacer according to an exemplary embodiment of the present invention.

Fig. 3 is a schematic view of a protective shield according to an exemplary embodiment of the invention.

Fig. 4 is a schematic structural view of a light-avoiding member according to an exemplary embodiment of the present invention.

Fig. 5 is an exploded perspective view of a shielding member, a light shielding member without a film, and a sealing spacer according to another exemplary embodiment of the present invention.

Fig. 6 is a partially enlarged cross-sectional schematic view of an αβ gauge according to an exemplary embodiment of the invention.

Fig. 7 is a schematic diagram of an αβ gauge according to an exemplary embodiment of the invention.

The correspondence of reference numerals to components is as follows: 1-guard, 2-fixture, 3-light-avoiding, 4-sealing fixture, 5-scintillator, 6-top cap, 7-photomultiplier, 8-housing, 9-hardware module, 10-bottom cap, 11-first grid, 12-first positioning element, 32-thin film layer, 21-second grid, 22-second positioning element, 40-fixing part, 41-first fixing part, 121-first notch, 221-second notch, 43-pin.

Detailed Description

The present disclosure now will be described more fully hereinafter with reference to the accompanying drawings, in which embodiments of the disclosure are shown. This disclosure may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

Describing an embodiment of the present disclosure with reference to fig. 1 to 7, an αβ measuring instrument in the present disclosure includes a protective member 1, a light-shielding member 3, and a sealing positioning member 4, wherein the protective member 1 includes a first grid 11 and a first positioning member 12, the light-shielding member 3 is disposed adjacent to the protective member 1, the light-shielding member 3 includes a fixing member 2 and at least one thin film layer 32 mounted on the fixing member 2, the fixing member 2 includes a second grid 21 and a second positioning member 22, the shape of the first grid 11 overlaps the shape of the second grid 21 in a direction of radiation incidence, in other words, an orthographic projection of the first grid 11 and the second grid 21 in a direction of light incidence, and the sealing positioning member 4 includes a fixing member 40 mutually engaged with the first positioning member 12 and the second positioning member 22 for fixing the light-shielding member 3 and the protective member 1 in the αβ measuring instrument.

The αβ measuring instrument in the disclosure can obviously improve the flatness of the light shielding piece 3, so that the instrument is more attractive, and secondly, the αβ measuring instrument in the disclosure improves the strength of the light shielding piece 3, so as to prevent the light shielding piece from deforming, moreover, the αβ measuring instrument in the disclosure can obviously improve the installation process of the light shielding piece 3, improve the installation efficiency and the success rate, and reduce the waste of time and materials.

In an exemplary embodiment according to the present disclosure, the first grid 11 in the protection member 1 and the second grid 21 in the fixing member 2 of the light-shielding member 3 are identical in shape, in other words, orthographic projections of the first grid 11 and the second grid 21 in the light incident direction overlap, and may include a triangle, a quadrangle, a pentagon, and a hexagon, preferably, the first grid 11 and the second grid 21 may be a honeycomb hexagonal grid, thereby improving flatness, strength, and manufacturability of the light-shielding member 3, when the shielding region of the hexagonal first grid 11 of the protection member 1 completely overlaps with the shielding region of the hexagonal second grid 21 of the light-shielding member, the detection performance of the αβ measuring instrument may be improved.

More specifically, the protection member 1 is installed outside the light-shielding member 3 with a certain gap, for example, a gap of 2-3 mm, between them, for example, as shown in fig. 2, the gap can be achieved by the sealing spacer 4, for example, by a ring of protrusions disposed in the middle of the inner circumference of the sealing spacer, to space the protection member 1 and the light-shielding member 3 apart, when the protection member 1 is disposed as a member with a honeycomb-shaped hexagonal grid, not only can the light-shielding member be protected from being scratched by foreign objects, but also a high radiation transmittance can be achieved, because the area of the grid for preventing the radiation of α, β from being transmitted is small, so that the hexagonal grid of the protection member 1 can also achieve a transmittance of the radiation vertically incident in excess.

In an exemplary embodiment according to the present disclosure, the first positioning element 12 may include one or more first recesses 121, the second positioning element 22 may include one or more second recesses 221, and accordingly, the fixing member 40 may include one or more protrusions. Alternatively, the first positioning element may comprise one or more first protrusions and the second positioning element may comprise one or more second protrusions, and correspondingly, the fixation means may comprise one or more recesses. For example, as seen in fig. 2 to 4, the first and

second recesses

121 and 221 may include a semicircular shape, a rectangular shape, a polygonal shape, or the like. Accordingly, the shape of the protrusion corresponds to the shape of the first recess 121 and the second recess 221, so that the protection member 1 or the light shielding member 3 can be fixed into the sealing and positioning member 4.

The position of the first notch 121 with respect to the first grid 11 is the same as the position of the second notch 221 with respect to the second grid 21, so that it can be ensured that the orthographic projections of the first grid 11 of the shield member 1 and the second grid 21 in the light-shielding member 3 in the direction can completely overlap when viewed from the direction in which the radiation is incident. In particular, the notches of the first positioning element 12 may cross horizontally or vertically with respect to the central grid of the first grid 11, and likewise the notches of the second positioning element 22 cross horizontally or vertically with respect to the central grid of the second grid 21. For example, the first grid 11 may be configured as a honeycomb hexagon, and the notches of the first positioning element 12 may be configured as two, and as shown in fig. 3, a line connecting two notches may coincide with one of the hexagonal grids. Likewise, the second grid 21 may be configured as a honeycomb hexagon, and the two notches of the second positioning element 22 may also be configured as two notches, and the connecting line between two notches also coincides with one of the hexagonal grids. Or the recesses of the second positioning element may be provided in four, wherein a line between two recesses also coincides with one of the hexagonal grids and a line between two other recesses is perpendicular to the one of the hexagonal grids.

In an exemplary embodiment according to the present disclosure, as shown in fig. 2, the shape of the first recess 121 may be the same as the shape of the second recess 221, and the shape of the protrusion of the fixing member 40 matches the shapes of the first recess 121 and the second recess 221, so that the protection cover 1 and the light-shielding member 3 may be firmly fixed to the sealing and positioning member 4, while the first grid 11 of the protection cover 1 and the second grid 21 of the fixing member 2 of the light-shielding member 3 may completely overlap, as viewed from the direction in which the radiation is incident, whereby it may be achieved that the transmittance of the radiation that is vertically incident is not substantially affected, and thus the overall detection efficiency of the αβ measurement instrument is not affected.

In exemplary embodiments according to the present disclosure, the number and structure of the first and

second positioning elements

12 and 22 may be the same. In other embodiments, the number and configuration of the first positioning elements 12 and the second positioning elements 22 may not be the same.

In an exemplary embodiment according to the present disclosure, as shown in fig. 2, the fixing part 40 includes a first fixing part 41 and a second fixing part (not shown in the drawings) provided corresponding to the first fixing part 41. In other words, the first fixing part 41 and the second fixing part are disposed at opposite ends of the sealing spacer along the light path. The first fixing member 41 may be engaged with the first positioning element 12 to fix the protection member 1 into the sealing positioning member 4, and the second fixing member may be engaged with the second positioning element 22 to fix the light shielding member 3 into the sealing positioning member 4. Alternatively, the number of the first fixing parts and the number of the second fixing parts are each set to three, and the structure of one of the fixing parts is different from the other two, and correspondingly, the number of the first positioning elements 12 and the second positioning elements 22 engaged with the first fixing parts 41 and the second fixing parts, respectively, is also three, and the configuration of one of the positioning elements is different from the other two, whereby it can be more accurately ensured that the first grid 11 of the protection member 1 and the second grid 21 of the light-shielding member 3 can be completely overlapped when viewed from the direction in which the radiation is incident. Alternatively, a complete overlap of the first and second grids may be ensured by the different positions in which the first fixing part engaging with the first positioning element and the second fixing part engaging with the second positioning element are arranged.

In another exemplary embodiment according to the present disclosure, as shown in fig. 5, the first positioning element 12 and the second positioning element 22 may further comprise one or more holes, and the fixing part 40 comprises one or more pins 43, the shape of the pins matching the shape of the holes, so that when the protection member 1 is placed over the light-shielding member 3, the pins may be inserted into the corresponding holes, thereby ensuring the relative fixation between the protection member 1 and the light-shielding member 3. In fig. 5, the pins in the sealing and positioning element 4 corresponding to the holes of the light-shielding element 3 are not shown. Alternatively, the first positioning element may further comprise one or more pins and the second positioning element comprises one or more holes.

The first positioning element 12 may comprise a plurality of holes which are horizontally or vertically crossed with respect to the central grid of the first grid 11, and likewise the second positioning element 22 comprises a plurality of holes which are horizontally or vertically crossed with respect to the central grid of the second grid 21. For example, the first grid 11 may be configured as a honeycomb hexagon, the holes of the first positioning element 12 may be configured as four, and as shown in fig. 3, a first line between two holes may coincide with the grid of the hexagonal grid, and a second line between another two holes may be perpendicular to the first line. The second grid 21 can be provided as honeycomb hexagons and the studs of the second positioning element 22 can be provided as four, and similarly, the first line between two studs can coincide with the grid of the hexagonal grid and the second line between two other holes can also be perpendicular to the first line, so as to ensure that the holes are positioned in the same way with respect to the first grid 11 and the studs are positioned in the same way with respect to the second grid 21. Thereby, when the pins are inserted into the holes, a complete overlap of the first grid 11 and the second grid 21 can be accurately ensured.

In an exemplary embodiment according to the present disclosure, the light shield 3 includes the fixing member 2 and one or more thin film layers 32. Preferably, two film layers 32 are included, the two film layers 32 being respectively located at both sides of the fixing member 2, as shown in fig. 4, one film layer 32 is respectively provided at the upper side and the lower side of the fixing member 2, the film layers 32 may be bonded to the outer peripheral region of the fixing member 2 through the outer peripheral region, and the film layers 32 may be, for example, an aluminum-plated polyester film.

In an exemplary embodiment according to the present disclosure, the protective shield 1 and the light shield 3 are sheet-like structures. In other words, the protection member 1, the fixing member 2, and the film layer 32 are all layered or sheet-like structures, so that the protection member 1 and the light-shielding member 3 are in a laminated structure. For example, when the protection member 1 and the fixing member 2 are both in a honeycomb hexagonal grid, the middle area between the film layer 32 and the fixing member 2 can be more uniformly distributed by arranging the middle area of the grid, so that the flatness of the light shielding member 3 can be effectively improved, and the appearance of the instrument is beautiful; meanwhile, the strength of the light shielding piece 3 is improved, and the deformation of the measuring instrument is prevented; the mounting process of the light-shielding member 3 can also be greatly improved.

Referring now to the drawings to describe in detail exemplary embodiments of the present disclosure, as shown in fig. 1 to 7, an αβ measuring instrument according to an exemplary embodiment of the present disclosure may include a housing 8, a top cover 6, a protection member 1, a light-shielding member 3, a sealing positioning member 4, a scintillator 5, a photomultiplier tube 7, a hardware module 9, a bottom cover 10, etc., wherein the housing 8 may be a shielding case, the housing 8 may accommodate therein the above-mentioned components of the αβ measuring instrument together with the top cover 6, the top cover 6 is mounted on the housing 8, located outside the light-shielding member, the sealing positioning member 4 is located between the top cover 6 and the scintillator 5, the protection member 1 and the light-shielding member 3 may be made of stainless steel, a grid therein may be formed by electrochemical etching, the protection member 1 and the light-shielding member 3 may be located on a side, i.e., a front side, of the scintillator 5, which is far away from the photomultiplier tube 7, and.

As shown in fig. 3, the protection member 1 is in a film shape, the periphery is in a ring shape, and the middle is in a honeycomb hexagonal grid, so that not only can the fixing member 2 in the light-shielding member be accurately positioned, but also the light-shielding member 3 can be protected, and the damage caused by scratching the film of the light-shielding member 3 by foreign objects in use can be avoided. For ease of positioning, both sides of the protection member 1 are provided with recesses, e.g. arc-shaped recesses.

As shown in fig. 2, the fixing member 2 is formed in a film shape, has a ring-shaped outer periphery and a honeycomb-shaped hexagonal grid in the middle, which is consistent with the shape, size and installation position of the protection member 1, so that the protection member 1 can be accurately positioned, and grooves, such as arc-shaped grooves, identical to those of the protection member 1 are provided on both sides of the fixing member 2, so that the grids of the protection member 1 and the grids of the fixing member 2 of the light-shielding member 3 can be completely overlapped, thereby not affecting the transmittance of the vertical incidence of the rays, and further not affecting the overall detection efficiency of the αβ measuring instrument.

As shown in FIG. 4, the light shielding member 3 comprises a film fixing member 2 and two layers of aluminum-plated polyester films 32. the light shielding member 3 is mounted at the front end of the plastic scintillator 5 to prevent the entrance of external light from affecting the detection result, since the penetration ability of α rays is very weak, at least 2 layers of aluminum-plated polyester films with thickness of 2-5 μm can be generally used for the light shielding member 3. the film fixing member 2 is adhesively fixed between the two layers of aluminum-plated polyester films, the grooves at the periphery of the film layers are correspondingly trimmed according to the grooves of the fixing member 2 to expose the grooves at the periphery of the fixing member 2. because the periphery of the fixing member 2 is annular and the middle part is a honeycomb hexagonal grid, not only the bonding area of the aluminum-plated polyester films and the fixing member 2 can be increased, but also the contact area of the fixing member 2 and the middle part of the films can be increased and the contact parts can be uniformly distributed.

Referring to fig. 1-2 and 6-7, the sealing spacer 4 may be a silicone sealing sleeve, and a ring of spacer, such as a ring, may be disposed in the middle of the inner circumference of the sealing spacer 4, so that a space for accommodating the shielding member 1 is defined above the spacer, and a space for accommodating the light shielding member 3 is defined below the spacer, while the shielding member 1 and the light shielding member 3 are isolated. Above and below the silicone sealing boot are provided fixing parts 40 which can be engaged with the positioning element 12 of the protection member 1 and the positioning element 22 of the fixing member 2, i.e., a first fixing part 41 engaged with the first positioning element 11 and a second fixing part engaged with the second positioning element 22, such as one or more protrusions configured to match and engage with the groove of the protection member 1 and the groove of the fixing member 2, respectively, so that the protection member 1 and the light shield 3 can be securely mounted. Thereby, a complete overlapping of the honeycomb hexagonal grids of the shielding member 1 and the film fixing member 2 in the direction of normal incidence of the radiation can be achieved, thereby not affecting the transmittance of the normal incidence of the radiation and further not affecting the overall detection efficiency.

Referring to fig. 6, in addition, when the sealing and positioning member 4 is implemented as a silicone sealing sleeve, it can also simultaneously isolate external light, thereby effectively ensuring the accuracy of the measuring instrument, specifically, the plastic scintillator 5 is installed in an inner groove below the silicone sealing sleeve 4, and is tightly arranged with the light-shielding member 3, and the top cover 6 and the housing 8 of the measuring instrument can be screwed or pressed tightly, so that the silicone sealing sleeve 4 is elastically pressed, thereby achieving the light shielding of the measuring instrument, when α, β rays pass through the light-shielding member 3 from the detection window and enter the plastic scintillator 5, the ionization and excitation of scintillator atoms are caused, the excited atoms excite scintillation photons with wavelengths in or near the visible light, the scintillation photons strike the cathode of the photomultiplier tube 7 through light transmission processes such as reflection, transmission, etc., generate photoelectrons, after multiplication, generate current signals, and finally the current signals are processed and displayed by the hardware module 9, thereby achieving the detection of radiation of α, β, or the final detection result can be output through an external display device.

Next, an assembly process of αβ measurement instrument according to an exemplary embodiment of the present disclosure will be described, in which first, the photomultiplier tube 7 may be mounted on the upper end of the inner cavity of the measurement instrument housing 8, then, the plastic scintillator 5 is mounted on the photomultiplier tube 7, then, the light shielding member 3 is mounted below the silicone sealing sleeve, the shielding member is mounted on the silicone sealing sleeve, then, the silicone sealing sleeve with the shielding member and the light shielding member 3 mounted thereon is integrally mounted on the plastic scintillator 5, and is fixed firmly by the top cover 6, and finally, the hardware module 9 and the bottom cover 10 are mounted.

The terminology used herein is for the purpose of exemplification of the disclosure only and should not be construed as limiting the meaning or scope of the disclosure. As used in this specification, the singular forms may include the plural forms unless the context clearly dictates otherwise. Furthermore, the terms "comprises" and/or "comprising," when used in this specification, do not specify the presence of stated shapes, integers, steps, acts, operations, elements, components, and/or groups thereof, nor preclude the presence or addition of one or more other different shapes, integers, steps, operations, elements, components, and/or groups thereof, or groups thereof. Spatially relative terms such as "above …", "above …", "above", "below …", "below …", "below …", "below" and the like are used herein for ease of description to describe the relationship of one element or feature to another element (element) or feature(s) as shown in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation (e.g., packaging), in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as below, beneath or beneath other elements or features would then be oriented above or beneath the other elements or features. Thus, the exemplary term "above …" may include orientations of "above …" and "below …". It is to be understood that the relative terms are intended to encompass different orientations of the device in addition to the orientation depicted in the figures.

As used herein, terms such as "first," "second," and the like, are used to describe various components, assemblies, regions, layers and/or sections. It will be apparent, however, that no member, component, region, layer or section should be limited by these terms. These terms are only used to distinguish one element, component, region, layer or section from another element, component, region, layer or section. Thus, a first element, component, region, layer or section that will be described may also refer to a second element, component, region, layer or section without departing from the scope of the disclosure.

The foregoing description of the exemplary embodiments of the present disclosure has been presented for the purposes of illustration and description only and is not intended to be exhaustive or to limit the disclosure to the precise forms disclosed. Many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to explain the principles of the disclosure and its practical application to enable others skilled in the art to utilize the disclosure and various embodiments and with various modifications as are suited to the particular use contemplated. Alternative embodiments will become apparent to those skilled in the art to which the present disclosure pertains without departing from its spirit and scope. Accordingly, the scope of the present disclosure is defined by the appended claims rather than by the foregoing description and the exemplary embodiments described therein.

Claims

1. An αβ measuring instrument, comprising:

a guard including a first grid and a first positioning element;

a light shielding member disposed adjacent to the shielding member, including a fixing member and at least one film layer mounted to the fixing member, the fixing member including a second grid and a second positioning element, and an orthographic projection of the first grid and the second grid in a direction in which the radiation is incident; and

a seal positioning member comprising a securing component engaged with the first positioning element and the second positioning element, the securing component arranged to secure the light shield and the guard in the αβ gauge.

2. The αβ gauge of claim 1, wherein the first and second grids have shapes including triangular, quadrilateral, pentagonal, hexagonal.

3. The αβ gauge of claim 1, wherein the first positioning element includes at least one first notch, the second positioning element includes at least one second notch, and the securing feature includes at least two protrusions that engage the first and second notches, respectively.

4. The αβ gauge of claim 3, wherein the first notch is located at the same position relative to the first grid as the second notch is located relative to the second grid.

5.αβ measuring instrument according to claim 3 or 4, wherein the fixing member comprises a first fixing member engaging with a first positioning element and a second fixing member engaging with a second positioning element.

6. The αβ gauge of claim 1, wherein the first positioning element includes at least one hole and the second positioning element includes at least one pin.

7. The αβ gauge of claim 6, wherein the position of the at least one hole relative to the first grid and the position of the at least one stud relative to the second grid are the same.

8. The αβ measuring instrument of claim 1, wherein the light shielding member comprises two thin film layers respectively disposed at two sides of the fixing member, and the thin film layers are aluminum-plated polyester films.

9. The αβ gauge of claim 1, wherein the guard and the light shield are in a sheet-like configuration.

10. The αβ gauge of claim 1, further comprising a housing, the scintillator, the photomultiplier tube, and the hardware module, wherein the light shield is located on a side of the scintillator remote from the photomultiplier tube, the photomultiplier tube is located between the scintillator and the hardware module, and the housing houses the shield, the light shield, the seal retainer, the scintillator, the photomultiplier tube, and the hardware module of the αβ gauge therein.