Portable neutron dose rate meter

Abstract

The embodiment of the utility model discloses a portable neutron dose rate instrument, which comprises a spherical polyethylene moderator, a cylindrical connecting part is connected to the upper part of the spherical polyethylene moderator, a cylindrical cavity is formed in the center of the spherical polyethylene moderator, and the cylindrical cavity is communicated with the cylindrical connecting part; supporting legs are arranged below the base; the cylindrical polyethylene moderator is adaptively arranged in the cylindrical cavity of the sphere; a spherical cavity is formed in the cylindrical polyethylene moderator, and a connecting hole communicated with the spherical cavity is formed in the upper surface of the cylindrical polyethylene moderator; the hollow cadmium sheet sphere is adaptively arranged in the spherical cavity in the cylindrical polyethylene moderator; the counter is arranged in the cadmium sheet sphere, and a polyethylene moderator material is arranged between the He3 counter and a shell of the cadmium sheet sphere; and the information processing assembly is arranged above the cylindrical polyethylene moderator, and the He3 counter is connected with the information processing assembly through a signal line arranged in the connecting hole.

Description

Technical Field

[0001] The utility model belongs to the technical field of nuclear radiation detection, and particularly relates to a portable neutron dose rate meter. Background Art

[0002] The dose rate monitor is a widely used nuclear instrument, and the neutron dose rate meter is a nuclear instrument for monitoring neutrons.

[0003] Generally, the detection of neutrons by a neutron dose rate meter is achieved as follows: Fast neutrons from the outside enter the polyethylene moderator through the surface of the detector. Some fast neutrons form thermal neutrons through the polyethylene moderator. After partial absorption by the cadmium sheet, the thermal neutrons are transmitted to the He3 counter tube through the small moderator inside the cadmium sheet. Some fast neutrons are transmitted through the air channel of the detector and received by the He3 counter tube through the small moderator. The electrical signal generated by the counter tube is transmitted to the main control board through two components, namely the transmission line and the connector. Among them, the volume of the moderator, the thickness and shape of the cadmium sheet, and the size of the air channel will all affect the neutron signal transmitted to the He3 counter, and thus affect the signal response of the detector. Moreover, the transmission line and the connector structure between the He3 counter and the main control board will determine the stability of the electrical signal transmission. Most neutron dose rate meters use a columnar moderator, and the thickness of the moderator is uneven, resulting in poor moderation effect on neutrons, poor energy response in neutron measurement, insufficient measurement credibility, and large errors. Summary of the Utility Model

[0004] In view of this, some embodiments disclose a portable neutron dose rate meter, including:

[0005] A spherical polyethylene moderator; the spherical polyethylene moderator is a whole sphere, and a cylindrical connecting part is connected above the sphere. A cylindrical cavity is provided in the center of the sphere, and the cylindrical cavity communicates with the cylindrical connecting part. Support legs are provided below the sphere;

[0006] A cylindrical polyethylene moderator; the cylindrical polyethylene moderator is adaptively arranged in the cylindrical cavity of the sphere. A spherical cavity is provided in the cylindrical polyethylene moderator, and a connecting hole is provided on the upper surface of the cylindrical polyethylene moderator, which communicates with the spherical cavity;

[0007] A cadmium sheet sphere; the cadmium sheet sphere is a hollow sphere and is adaptively arranged in the spherical cavity inside the cylindrical polyethylene moderator;

[0008] An He3 counter; the He3 counter is arranged inside the cadmium sheet sphere, and a polyethylene moderator material is provided between the He3 counter and the shell of the cadmium sheet sphere;

[0009] An information processing component; the information processing component is arranged above the cylindrical polyethylene moderator, and the He3 counter is connected to the information processing component through a signal line arranged in the connecting hole.

[0010] Furthermore, for the portable neutron dose rate meter disclosed in some embodiments, a buffer pad is provided outside the He3 counter.

[0011] For the portable neutron dose rate meter disclosed in some embodiments, a fixed tube is provided in the connection hole, and a polytetrafluoroethylene sleeve is further provided in the fixed tube. The signal wire is a copper core wire and is arranged in the polytetrafluoroethylene sleeve.

[0012] For the portable neutron dose rate meter disclosed in some embodiments, the information processing component includes:

[0013] A shielding cover; the shielding cover is fixedly connected to the upper surface of the cylindrical polyethylene moderator.

[0014] A detection main control board; the detection main control board is arranged in the shielding cover and is connected to the signal wire.

[0015] For the portable neutron dose rate meter disclosed in some embodiments, the cylindrical polyethylene moderator is detachably arranged in the cylindrical cavity of the sphere.

[0016] For the portable neutron dose rate meter disclosed in some embodiments, a structure for fixing the cylindrical polyethylene moderator is provided at the bottom of the arc-shaped cavity.

[0017] For the portable neutron dose rate meter disclosed in some embodiments, it further includes:

[0018] A cover body, which is rotatably connected to the cylindrical connecting part;

[0019] A handle, which is arranged on the cover body;

[0020] A buckle, which is arranged on the cover body and is used to lock the cover body on the cylindrical connecting part.

[0021] For the portable neutron dose rate meter disclosed in some embodiments, one end of the fixed tube is fixedly connected to the detection main control board, and the other end of the fixed tube is fixedly connected to the He3 counter.

[0022] For the portable neutron dose rate meter disclosed in some embodiments, a plurality of air channels communicating with the outside are provided in the spherical polyethylene moderator, and the distribution direction of the air channels is the radial direction of the spherical polyethylene moderator.

[0023] For the portable neutron dose rate meter disclosed in some embodiments, air channels are provided on the cylindrical polyethylene moderator and are correspondingly arranged with the air channels on the spherical polyethylene moderator.

[0024] The portable neutron dosimeter disclosed in the embodiments of the present utility model uses a hollow cadmium sheet sphere, which enhances the energy response and angular response. A fixed tube and a copper core wire are fixedly connected between the counter and the detection main control board, and a polytetrafluoroethylene bushing is arranged between the fixed tube and the copper core wire to ensure the stability of signal transmission and improve the seismic resistance of the device; support legs are arranged below the spherical polyethylene moderator, which can improve the seismic resistance of the device; the buffer pads arranged outside the counter also effectively improve the seismic resistance of the device. Description of the Drawings

[0025] Figure 1 Schematic structural diagram of the portable neutron dosimeter disclosed in some embodiments;

[0026] Figure 2 is Figure 1 Partial enlarged view of the portable neutron dosimeter in

[0027] Reference Signs

[0028] 1 Spherical polyethylene moderator 2 Cylindrical polyethylene moderator

[0029] 3 Cadmium sheet sphere 4 Polyethylene moderator material

[0030] 5 He3 counter 6 Buffer pad

[0031] 7 Information processing component 8 Cover

[0032] 9 Handle 10 Cylindrical connecting part

[0033] 11 Support leg 71 Shielding cover

[0034] 72 Detection main control board 73 Copper core wire

[0035] 74 Fixed tube 75 Polytetrafluoroethylene sleeve Detailed Embodiments

[0036] The special term "embodiment" here, any embodiment described as "exemplary" does not have to be construed as superior to or better than other embodiments. For the performance index tests in the embodiments of the present utility model, unless otherwise specified, conventional test methods in the art are adopted. It should be understood that the terms described herein are only for describing specific embodiments and are not used to limit the content disclosed in the embodiments of the present utility model.

[0037] Unless otherwise specified, the technical and scientific terms used herein have the same meanings as those commonly understood by those of ordinary skill in the technical field to which the present utility model belongs; other test methods and technical means not specifically noted in the present utility model refer to the experimental methods and technical means commonly adopted by those of ordinary skill in the art.

[0038] As used herein, the terms "substantially" and "about" are used to describe minor fluctuations. For example, they can refer to less than or equal to ±5%, such as less than or equal to ±2%, such as less than or equal to ±1%, such as less than or equal to ±0.5%, such as less than or equal to ±0.2%, such as less than or equal to ±0.1%, such as less than or equal to ±0.05%. Numerical data presented or represented herein in a range format is used only for convenience and brevity and should therefore be interpreted flexibly to include not only the values explicitly recited as the limits of the range, but also all individual values or sub-ranges included within that range. For example, a numerical range of "1 to 5%" should be interpreted to include not only the explicitly recited values of 1% to 5%, but also individual values and sub-ranges within the indicated range. Thus, individual values such as 2%, 3.5%, and 4% and sub-ranges such as 1% to 3%, 2% to 4%, and 3% to 5% etc. are included within this numerical range. This principle also applies to ranges that recite only a single value. In addition, such an interpretation applies regardless of the width of the range or the characteristics described.

[0039] As used herein, including in the claims, conjunctive terms such as "comprising", "including", "carrying", "having", "containing", "involving", "accommodating", etc. are understood to be open-ended, i.e., meaning "including but not limited to". Only the conjunctive terms "consisting of" and "composed of" are closed conjunctive terms.

[0040] For a better illustration of the content of the present utility model, numerous specific details are given in the following specific embodiments. Those skilled in the art should understand that the present utility model can also be implemented without some of these specific details. In the embodiments, some methods, means, instruments, devices, etc. well-known to those skilled in the art are not described in detail in order to highlight the gist of the present utility model.

[0041] On the premise of no conflict, the technical features disclosed in the embodiments of the present utility model can be combined arbitrarily, and the obtained technical solutions belong to the content disclosed in the embodiments of the present utility model.

[0042] In some embodiments, such as Figure 1 , 2 shown, the portable neutron dose rate meter includes:

[0043] Spherical polyethylene moderator 1; The overall shape of the spherical polyethylene moderator 1 is a sphere. A cylindrical connecting part 10 is connected above the spherical polyethylene moderator 1, and there is a cylindrical cavity inside the cylindrical connecting part 10; A cylindrical cavity is arranged at the central position inside the spherical polyethylene moderator 1, and the cylindrical cavity communicates with the cylindrical cavity of the cylindrical connecting part; A cover body 8 is arranged on the cylindrical connecting part 10, and the cover body 8 is rotatably connected to the cylindrical connecting part 10 for opening / closing operations of the cover body; For example, it is arranged to be connected in a hinge manner; Support legs 11 are arranged below the spherical polyethylene moderator 1; Usually, multiple support legs 11 are arranged, symmetrically spaced and fixed outside the spherical polyethylene moderator 1 to form a stable support for the spherical polyethylene moderator 1 and improve its ability to resist vibration; A handle 9 is arranged above the cover body 8 to facilitate holding to open the cover body or facilitate carrying the dosimeter equipment; A buckle can be further arranged on the cover body 8 to facilitate buckling and locking the cover body 8 to the cylindrical connecting part 10;

[0044] Cylindrical polyethylene moderator 2; Usually, the cylindrical polyethylene moderator 2 is an integrally formed independent component, and the cylindrical polyethylene moderator 2 can be adaptively arranged in the cylindrical cavity inside the spherical polyethylene moderator 1; A spherical cavity is arranged in the cylindrical polyethylene moderator 2, and a connecting hole is arranged on the upper surface of the cylindrical polyethylene moderator 2, and the connecting hole communicates with the spherical cavity inside the cylindrical polyethylene moderator 2;

[0045] Usually, in some embodiments, the cylindrical polyethylene moderator 2 is arranged in the cylindrical cavity of the spherical polyethylene moderator 1 in a detachable manner. Usually, the cylindrical polyethylene moderator 2 is an independent component and also serves as a base for installing a cadmium sheet sphere, a neutron tube, an information processing component, etc. The cylindrical polyethylene moderator 2 is arranged in the cylindrical cavity in a detachable manner to facilitate disassembly, replacement, and installation of the cylindrical polyethylene moderator 2 and other components arranged therein;

[0046] In some embodiments, a structure for fixing the cylindrical polyethylene moderator is arranged at the bottom of the cylindrical cavity. A fixing structure is arranged at the bottom of the cylindrical cavity to install the cylindrical polyethylene moderator at a fixed position. For example, fixing columns can be arranged at the bottom of the cylindrical cavity inside the spherical polyethylene moderator 1, and grooves corresponding in position and shape to the fixing columns are arranged at the corresponding positions at the bottom of the cylindrical polyethylene moderator 2;

[0047] In some embodiments, multiple fixing columns are arranged at the bottom of the cylindrical cavity, and multiple grooves are arranged at the bottom of the cylindrical polyethylene moderator, corresponding to each other one by one;

[0048] Cadmium sheet sphere 3; Usually, the cadmium sheet sphere 3 is a hollow sphere, and the cadmium sheet sphere 3 is adaptively arranged in the spherical cavity arranged inside the cylindrical polyethylene moderator 2;

[0049] He3 counter 5; The He3 counter 5 is also known as a neutron tube. Usually, the He3 counter is arranged in a spherical cavity within the cadmium sheet sphere 3. Further, a polyethylene moderating material 4 is provided between the He3 counter 5 and the housing of the cadmium sheet sphere 3. The polyethylene moderating material 4 completely wraps the He3 counter and stably arranges it within the cadmium sheet sphere 3; To enhance the seismic resistance of the He3 counter 5, a buffer pad 6 is provided outside the He3 counter 5. Usually, the buffer pad 6 is provided between the polyethylene moderating material 4 and the He3 counter 5; For example, a buffer pad 6 can be provided below the He3 counter 5; Usually, the polyethylene moderating material 4 can also be formed into a structurally stable component, serving as an independent small moderator, which is convenient for installation.

[0050] Information processing component 7; The information processing component 7 is arranged and installed above the cylindrical polyethylene moderator 2. The He3 counter 5 and the information processing component 7 are connected by a signal line arranged in a connection hole.

[0051] In some embodiments, the information processing component 7 includes: a shielding cover 71, and the shielding cover 71 is fixedly connected to the upper surface of the cylindrical polyethylene moderator 2; a detection main control board 72, and the detection main control board 72 is arranged within the shielding cover 71 and is arranged to be connected to the signal line.

[0052] Further, a fixing tube 74 is arranged in the connection hole, and a polytetrafluoroethylene sleeve 75 is further arranged within the fixing tube 74. The signal line is a copper core wire 73 and is arranged within the polytetrafluoroethylene sleeve; Usually, the fixing tube 74 fits within the connection hole, tightly cooperates with the connection hole, and is fixed in position.

[0053] One end of the fixing tube 74 is fixedly connected to the detection main control board 72, and the other end of the fixing tube 74 is fixedly connected to the He3 counter 5.

[0054] The fixing tube 74 is tightly provided with a polytetrafluoroethylene sleeve 75 in a fitting manner. The polytetrafluoroethylene sleeve 75 is mutually adapted to the connection head of the He3 counter 5 in order to fix it; One end of the copper core wire 73 arranged within the polytetrafluoroethylene sleeve 75 is connected to the connection head of the He3 counter 5, and the other end of the copper core wire 73 is connected to the detection main control board 72.

[0055] Usually, a plurality of air channels communicating with the outside are arranged within the spherical polyethylene moderator 1. The layout direction of the air channels is the radial direction of the spherical polyethylene moderator. With the air through holes arranged in this direction, one side points to and communicates with the external air, and the other side points to the internal neutron tube.

[0056] Usually, air channels are arranged on the cylindrical polyethylene moderator 2, corresponding to the air channels on the spherical polyethylene moderator.

[0057] When the portable neutron dose rate meter is in the detection operation, fast neutrons in the environment outside the spherical polyethylene moderator 1 enter the spherical polyethylene moderator 1 and the cylindrical polyethylene moderator 2 from its surface. A part of the fast neutrons form thermal neutrons through the spherical polyethylene moderator 1 and the cylindrical polyethylene moderator 2. After being partially absorbed by the cadmium sheet sphere 3, the thermal neutrons are transmitted to the He3 counter 5 through the small moderator inside the cadmium sheet sphere 3; a part of the fast neutrons are transmitted through the air channels in the spherical moderator 1 and the cylindrical moderator 2 and received by the He3 counter 5 through the small moderator; the electrical signal generated by the He3 counter 5 is transmitted to the detection main control board 72 through the copper core wire 73, and through further information processing, the neutron detection result can be obtained.

[0058] The portable neutron dose rate meter disclosed in the embodiment of the present invention adopts a hollow cadmium sheet sphere, which enhances the energy response and angular response. The counter and the detection main control board are fixedly connected by a fixed tube and a copper core wire. A polytetrafluoroethylene bushing is arranged between the fixed tube and the copper core wire to ensure the stability of signal transmission and improve the seismic resistance of the device; support legs are arranged below the spherical polyethylene moderator to improve the seismic resistance of the device; the buffer pads arranged outside the counter also effectively improve the seismic resistance of the device.

[0059] The technical solutions disclosed in the embodiments of the present invention and the technical details disclosed in the embodiments are only exemplary illustrations of the inventive concept of the present invention, and do not constitute a limitation on the technical solutions of the embodiments of the present invention. Any conventional changes, substitutions or combinations made to the technical details disclosed in the embodiments of the present invention have the same inventive concept as the present invention and are within the protection scope of the claims of the present invention.

Claims

1. Portable neutron dose rate meter, characterized in that, Including: Spherical polyethylene moderator; the spherical polyethylene moderator is a whole sphere, a cylindrical connecting part is connected above the sphere, a cylindrical cavity is arranged in the center of the sphere, and the cylindrical cavity communicates with the cylindrical connecting part; support legs are arranged below the sphere. Cylindrical polyethylene moderator; the cylindrical polyethylene moderator is adaptively arranged in the cylindrical cavity of the sphere; a spherical cavity is arranged in the cylindrical polyethylene moderator, and a connecting hole is arranged on the upper surface of the cylindrical polyethylene moderator and communicates with the spherical cavity. Cadmium sheet sphere; the cadmium sheet sphere is a hollow sphere and is adaptively arranged in the spherical cavity inside the cylindrical polyethylene moderator. He3 counter; the He3 counter is arranged inside the cadmium sheet sphere, and a polyethylene moderator material is arranged between the He3 counter and the shell of the cadmium sheet sphere. Information processing component; the information processing component is arranged and installed above the cylindrical polyethylene moderator, and the He3 counter and the information processing component are connected by a signal line arranged in the connecting hole.

2. The portable neutron dose rate meter according to claim 1, wherein A buffer pad is arranged outside the He3 counter.

3. The portable neutron dose rate meter according to claim 1, wherein A fixing tube is arranged in the connecting hole, a polytetrafluoroethylene sleeve is further arranged in the fixing tube, and the signal line is a copper core wire and is arranged in the polytetrafluoroethylene sleeve.

4. The portable neutron dose rate meter according to claim 3, characterized in that, The information processing component includes: Shielding cover; the shielding cover is fixedly connected to the upper surface of the cylindrical polyethylene moderator. Detection main control board; the detection main control board is arranged inside the shielding cover and is connected to the signal line.

5. The portable neutron dose rate meter according to claim 1, characterized in that, The cylindrical polyethylene moderator is arranged in the cylindrical cavity of the sphere in a detachable manner.

6. The portable neutron dose rate meter according to claim 5, characterized in that, A structure for fixing the cylindrical polyethylene moderator is arranged at the bottom of the arc-shaped cavity.

7. The portable neutron dose rate meter according to claim 1, characterized in that, Also including: Cover body, which is rotatably connected to the cylindrical connecting part. Handle, which is arranged on the cover body. Snap fastener, which is arranged on the cover body and is used to lock the cover body on the cylindrical connecting part.

8. The portable neutron dose rate meter according to claim 4, wherein One end of the fixing tube is fixedly connected to the detection main control board, and the other end of the fixing tube is fixedly connected to the He3 counter.

9. The portable neutron dose rate meter according to claim 1, characterized in that, A plurality of air channels communicating with the outside are arranged in the spherical polyethylene moderator, and the layout direction of the air channels is the radial direction of the spherical polyethylene moderator.

10. The portable neutron dose rate meter according to claim 9, characterized in that, Air channels are arranged on the cylindrical polyethylene moderator and are correspondingly arranged with the air channels on the spherical polyethylene moderator.

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