Flow-gas proportional counter module

Abstract

The utility model relates to the field of nuclear radiation detection, and discloses a flow-gas proportional counter module. The flow-gas proportional counter module comprises a sample feeding assembly and a probe assembly, the sample feeding assembly comprises a base and a drawing plate connected with the base in a sliding mode, and the drawing plate is provided with a tray used for containing samples; the probe assembly comprises a proportional counter tube arranged above the tray, a shielding shell is arranged outside the proportional counter tube, and the shell is fixedly connected with the base; by arranging the proportional counter tube in the shielding shell, the contact between the proportional counter tube and the external environment is effectively reduced, the electromagnetic shielding effect is improved, the interference of environment temperature and humidity on detection signals is reduced, the signal detection accuracy of the proportional counter tube is improved, and the detection background is reduced.

Description

Technical Field

[0001] The invention relates to the field of nuclear radiation detection, and in particular to a gas flow type proportional counter module. Background Art

[0002] The gas flow proportional counter is a particle detector that uses gas as the working medium and has an output pulse amplitude proportional to the initial ionization. The structure of this detector is mostly cylindrical, with the center being the anode wire, the diameter of the anode wire is generally 20 to 100 μm, and the cylindrical shell is the cathode. The gas used as the working medium of the proportional counter is generally a mixture of an inert gas and a small amount of negatively charged gas. The incident particles collide with the gas atoms in the proportional counter to ionize the atoms, generating electrons and ions. Under the action of the electric field, the electrons move toward the central anode wire, while the positive ions drift toward the cathode at a much slower speed than the electrons. The electrons are accelerated by the strong electric field near the anode wire to gain energy, which can re-ionize the atoms. The detector can convert α and β radiation information into electrical pulse signals, and the output pulse signal amplitude is proportional to the energy of the incident particles. The preamplifier circuit is connected to the anode of the gas flow proportional counter tube to extract the signal. After the coincidence and anti-coincidence circuits detect the data of the signal, the interference signal is eliminated to give the final effective α and β radiation information data.

[0003] The existing gas flow type α and β counter equipment has many parts, complex installation, poor electromagnetic shielding efficiency, high detection background, and is time-consuming and labor-intensive when assembling the equipment and replacing samples. In order to improve the methods that are insufficient in the existing technology, better meet market demand, facilitate mass production, and improve assembly and replacement efficiency, it is necessary to further improve the gas flow type proportional counter. Summary of the invention

[0004] The object of the present invention is to provide a gas flow proportional counter module, which is simple to assemble, improves the electromagnetic shielding effect and reduces the detection background.

[0005] In order to solve the above technical problems, the embodiments of the present invention provide a technical solution as follows:

[0006] A gas flow type proportional counter module comprises a sample delivery component and a probe component. The sample delivery component comprises a base and a drawer plate slidably connected to the base, and a tray for placing samples is provided on the drawer plate; the probe component comprises a proportional counter tube arranged above the tray, and a shielding shell is provided outside the proportional counter tube, and the shell is fixedly connected to the base.

[0007] Furthermore, a detection window is provided opposite to the housing and the tray, and the incident window of the proportional counter tube is provided corresponding to the detection window.

[0008] Furthermore, a preamplifier circuit electrically connected to the anode of the proportional counter tube is provided in the shell, and the preamplifier circuit outputs signals through a preamplifier cable.

[0009] Furthermore, the outer cover of the preamplifier circuit is provided with a shielding cover.

[0010] Furthermore, one end of the front-release cable lead-out shell is provided with a line outlet plug, and the line outlet plug is conductive foam.

[0011] Furthermore, the shell is made of copper.

[0012] Furthermore, a sliding block is fixedly provided on the base along the axial direction, and sliding rails are provided on the draw plate and the sliding block correspondingly. The draw plate can be linearly displaced along the axial direction relative to the base through the cooperation of the sliding rails and the sliding block.

[0013] Furthermore, a stop block is provided at one end of the slide rail, and the stop block can stop the sliding block to limit the linear motion of the draw plate.

[0014] Furthermore, a ball plunger is fixedly provided on the base, and a buffer groove is provided on the pull-out plate corresponding to the ball plunger. The buffer groove is provided with a bottom surface and a stop wall. The ball plunger abuts against the bottom surface of the buffer groove, and the stop wall can stop the ball plunger upward along the axis of the pull-out plate to limit the linear motion of the pull-out plate.

[0015] Furthermore, the bottom surface is an inclined surface, and a vertical distance between an end of the inclined surface close to the stop wall and the ball plunger is smaller than a vertical distance between an end of the inclined surface far from the stop wall and the ball plunger.

[0016] Furthermore, a first magnetic component is fixedly provided on the base, and a second magnetic component is correspondingly provided on the drawer plate. The first magnetic component and the second magnetic component are close to each other and attracted to each other when the tray and the incident window of the proportional counter tube are directly opposite.

[0017] Furthermore, the first magnetic attraction member and / or the second magnetic attraction member is a magnet.

[0018] Furthermore, the probe assembly also includes an air supply pipe and an air outlet pipe connected to the proportional counter tube, and the air supply pipe and the air outlet pipe are connected to an external air source through an air pipe joint.

[0019] Compared with the prior art, the airflow proportional counter module provided by the present invention effectively reduces the contact between the proportional counter tube and the external environment by arranging the proportional counter tube in a shielding shell, thereby increasing the electromagnetic shielding effect, reducing the interference of the ambient temperature and humidity on the detection signal, improving the accuracy of the detection signal of the proportional counter tube, and reducing the detection background; by connecting and fixing the fixed block and the fixed plate, the relative position of the proportional counter tube and the shell detection window is fixed, so that the distance between the incident and the sample of the proportional counter tube remains stable, which is conducive to improving the efficiency and accuracy of sample detection, and is convenient for assembly and mass production. Through the buffering design of the buffer groove and the ball plunger, the vibration of the pumping plate can be effectively reduced during the process of using the pumping plate to transport the sample, and the risk of sample scattering can be reduced. Through the adsorption design of the first magnetic suction member and the second magnetic suction member, the relative position of the sample and the proportional counter tube can be kept stable during the sample detection process, reducing the risk of reduced detection accuracy due to accidental sliding of the pumping plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] One or more embodiments are exemplarily described by pictures in the corresponding drawings, and these exemplified descriptions do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings represent similar elements, and unless otherwise stated, the figures in the drawings do not constitute proportional limitations.

[0021] Figure 1 1 is a schematic diagram of the overall structure of a gas flow proportional counter module in an embodiment of the present invention;

[0022] Figure 2 It is a schematic diagram of the exploded structure of the sample delivery component and the probe component in an embodiment of the present invention;

[0023] Figure 3 is an exploded view of a sample delivery component in an embodiment of the present invention;

[0024] Figure 4 It is a schematic diagram of the structure of an air flow proportional counter in a state where the base is hidden in an embodiment of the present invention.

[0025] Figure 5 1 is an exploded view of the probe assembly in an embodiment of the present invention.

[0026] Explanation of reference numerals: 100, sample delivery assembly; 110, drawer plate; 111, handle; 112, buffer slot; 1121, bottom surface; 1122, stop wall; 113, notch; 114, second magnetic member; 120, tray; 130, slide rail; 131, stop block; 140, first magnetic member; 150, ball plunger; 160, slider; 170, base; 200, probe assembly; 210, shell; 211, cabin bottom; 212, cabin cover; 220, proportional counter tube; 221, air inlet pipe; 222, air outlet pipe; 230, fixing plate; 240, fixing block; 250, detection window; 260, air pipe joint; 270, preamplifier circuit; 271, preamplifier cable; 280, outlet plug. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical scheme and advantages of the present invention clearer, the following will be described in detail with reference to the accompanying drawings. However, it will be appreciated by those skilled in the art that in the various embodiments of the present invention, many technical details are provided in order to enable the reader to better understand the present application. However, even without these technical details and various changes and modifications based on the following embodiments, the technical scheme claimed for protection in the claims of the present application can be implemented.

[0028] like Figure 1-5 As shown, the gas flow proportional counter module provided by the present invention includes a sample delivery component 100 and a probe component 200, wherein the sample delivery component 100 is used for sample delivery, and the probe component 200 is used for sample detection. The sample delivery component 100 includes a base 170, and a drawer plate 110 slidably connected to the base 170, and a tray 120 for placing samples is provided on the drawer plate 110; the probe component 200 includes a proportional counter tube 220 disposed above the tray 120, and a shielding shell 210 is provided outside the proportional counter tube 220, and the shell 210 is fixedly connected to the base 170.

[0029] like Figure 5As shown, the probe assembly 200 includes a shell 210 of a boxed structure, the shell 210 includes a bottom 211 and a hatch 212 fixed to the open end of the bottom 211, a proportional counter tube 220 is provided inside the shell 210, and an air inlet pipe 221 and an air outlet pipe 222 connected to the proportional counter tube 220, a preamplifier circuit 270 is electrically connected to the anode of the proportional counter tube 220, the preamplifier circuit 270 is used to process the detection signal of the proportional counter tube 220, preferably, the preamplifier circuit 270 is provided with a shielding cover, and the preamplifier circuit 270 is connected to the single-chip microcomputer through a preamplifier cable 271 to output and analyze the detection signal. A detection window 250 is provided on the cabin bottom 211 corresponding to the position of the incident window of the proportional counter tube 220. A fixed height fixing block 240 is provided at the edge of the detection window 250. The proportional counter tube 220 is restricted and fixed in the housing 210 by the combination of the fixing plate 230 and the fixing block 240, and the distance between the incident window of the proportional counter tube 220 and the detection window 250 is maintained. This is conducive to ensuring the stability of the distance between the incident window of the proportional counter tube 220 and the sample, facilitating the selection of the optimal detection distance, improving the efficiency and accuracy of the proportional counter detection, and reducing the detection background. Specifically, the top of the proportional counter tube 220 is fixedly connected to the fixing plate 230 by fasteners, so that the incident window of the proportional counter tube 220 and the detection window 250 are arranged opposite each other, and then the edge of the fixing plate 230 is fixedly connected to the fixing block 240 by fasteners, so that the proportional counter tube 220 is fixedly arranged in the housing 210, the vertical distance between the incident window and the detection window 250 is kept stable, and the distance between the incident window of the proportional counter tube 220 and the sample is ensured to be stable. Through the cooperation of the fixing block 240 and the fixing plate 230, the distance between the incident window and the sample can be conveniently selected to improve the detection efficiency. At the same time, the assembly is simple and convenient for mass production.

[0030] In another embodiment, the top of the proportional counter tube 220 is directly fixed to the hatch cover 212 by fasteners, the hatch cover 212 is fixedly connected to the cabin bottom 211, and the incident window of the proportional counter tube 220 faces the detection window 250 of the cabin bottom 211, so that the proportional counter tube 220 is fixedly connected to the shell 210, maintaining the stability of the vertical distance between the incident window and the detection window 250, and ensuring the stability of the distance between the incident window of the proportional counter tube 220 and the sample.

[0031] The proportional counter tube 220 and the preamplifier circuit 270 are accommodated in the shell 210, which can effectively reduce the interference of electromagnetic interference on the detection signal of the proportional counter tube 220, reduce the contact between the proportional counter tube 220 and the preamplifier circuit 270 and the external environment, and effectively reduce the interference of ambient temperature and humidity on the detection signal, which is beneficial to increase the accuracy of the sample detection signal.

[0032] In one embodiment, an air pipe connector 260 is provided at the end of the shell 210. One end of the air pipe connector 260 is a right-angle connector exposed on the outside of the shell 210 for connecting to an external air source pipeline, and the other end is a pagoda-shaped connector provided on the inside of the shell 210 for connecting to the air inlet pipe 221 and the air outlet pipe 222 of the proportional counter tube 220.

[0033] Preferably, a line plug 280 is provided at the position where the front-end cable 271 is led out of the shell 210. The front-end cable 271 passes through the interlayer of the line plug 280 and then leads out of the shell 210 to be connected to the outside. Preferably, the line plug 280 is conductive foam, which can further reduce electromagnetic interference.

[0034] Preferably, the shell 210 is made of copper, and the shielding cavity formed can further increase the electromagnetic shielding effect and reduce the detection background.

[0035] like Figure 3-4 As shown, in one embodiment, the tray 120 can move relative to the base 170 and the probe assembly 200 along with the drawer 110, so that the sample is in the detection position or the pick-up position. In the detection position, the tray 120 is directly opposite to the detection window 250 of the probe assembly 200, that is, the axis of the tray 120 and the detection window 250 coincide, so that more sample radiation light can pass through the detection window 250, so as to increase the efficiency and accuracy of the detection; in the pick-up position, the tray 120 and the probe assembly 200 are staggered, so that the staff can more conveniently pick up and place the sample.

[0036] In one embodiment, the base 170 includes a bottom wall and side walls extending vertically along two opposite edges of the bottom wall. The base 170 is generally in a U-shaped groove structure, and the probe assembly 200 is fixedly arranged at the open end of the U-shaped groove. The bottom wall is provided with a slider 160 along the central axis, and the draw plate 110 is provided with a slide rail 130 along the central axis on the side facing the bottom wall. One end of the slide rail 130 is arranged in the plane of the draw plate 110, and the other end axially extends beyond the plane of the draw plate 110. A stop block 131 is provided at one end of the slide rail 130 beyond the plane of the draw plate 110. The slide rail 130 is arranged in cooperation with the slider 160. The slide rail 130 can slide back and forth along the slider 160 in a straight line. The stop block 131 can abut against the slider 160 when the slide rail 130 moves, so as to limit the moving position of the slide rail 130 relative to the slider 160, and prevent the slide rail 130 from detaching from the slider 160 when it moves in a single direction. Preferably, two sliders 160 are provided to increase the stability of the pumping plate 110 when it moves relative to the base 170 .

[0037] In another embodiment, two groups of sliders 160 are symmetrically provided on the bottom wall along both sides of the central axis, and the drawer plate 110 is correspondingly provided with two slide rails 130 , and the slide rails 130 are axially slidably connected relative to the sliders 160 .

[0038] A handle 111 is provided at one end of the drawer plate 110 away from the stop block 131, and a second magnetic component 114 is provided at the end close to the handle 111. A first magnetic component 140 is provided on the base 170 corresponding to the second magnetic component 114. When the tray 120 moves to the detection position with the drawer plate 110, an adsorption force is generated between the first magnetic component 140 and the second magnetic component 114, which is beneficial to maintaining the relative position stability of the drawer plate 110 and the base 170, increasing the stability of the position of the drawer plate 110 and the tray 120 relative to the detection window 250 during detection, and preventing the drawer plate 110 from accidentally sliding, which may reduce the detection efficiency and accuracy. Preferably, when in the detection position, a gap is provided between the first magnetic member 140 and the second magnetic member 114, and the non-contact release is prevented to prevent excessive adsorption force, which may cause vibration when the draw plate 110 moves. For example, when the draw plate 110 needs to be pulled to change its position due to excessive adsorption force, excessive force is applied to overcome the adsorption force of the first magnetic member 140 and the second magnetic member 114, causing the draw plate 110 to accelerate violently, resulting in the scattering of samples in the tray 120. Preferably, when the draw plate 110 is in the detection position, the distance between the first magnetic member 140 and the second magnetic member 114 is 0.5 mm-2 mm.

[0039] In one embodiment, the first magnetic member 140 and the second magnetic member 114 are both magnets, and the polarities of the opposite ends of the first magnetic member 140 and the second magnetic member 114 are opposite. In another embodiment, the first magnetic member 140 is a magnet, and the second magnetic member 114 is made of a material that can be magnetically attracted, such as iron, cobalt, nickel, alloys thereof, and ferrite.

[0040] A buffer groove 112 is provided at one end of the drawer plate 110 away from the handle 111, and the buffer groove 112 includes a bottom surface 1121 and a stop wall 1122 extending vertically along the bottom surface 1121. A ball plunger 150 is provided on the base 170 corresponding to the buffer groove 112. When the drawer plate 110 moves to the detection position, the ball plunger 150 abuts against the bottom surface 1121 of the buffer groove 112, which can increase the damping of the horizontal movement of the drawer plate 110, make the horizontal movement of the drawer plate 110 smoother, reduce the vibration of the drawer plate, and prevent the sample from detaching from the tray 120 or causing the sample powder to scatter. Preferably, the bottom surface 1121 of the buffer groove 112 is an inclined surface, and the distance between the bottom surface 1121 of the buffer groove 112 near the handle 111 and the ball plunger 150 is smaller than the distance between the bottom surface 1121 of the buffer groove 112 near the stop block 131 and the ball plunger 150. The closer to the detection position, the smaller the distance between the bottom surface 1121 and the ball plunger 150, that is, the greater the pressure of the buffer groove 112 on the ball plunger 150, and therefore, the greater the damping of the horizontal movement of the draw plate 110, until the stop wall 1122 abuts against the ball plunger 150, the movement of the draw plate 110 is stopped, and the draw plate 110 moves to the detection position. At the same time, an adsorption force is generated between the first magnetic suction component 140 and the second magnetic suction component 114 to maintain the stability of the relative position of the draw plate 110 and the probe assembly 200. The ball plunger 150, also known as a spring plunger or a positioning bead, is a load device composed of a housing, a spring, a ball or a cylinder, and is a commonly used accessory for mechanical structures in the prior art. The structure of the ball plunger 150 will not be described in detail herein.

[0041] The tray 120 is placed on the drawer plate 110, and a groove for accommodating the tray 120 is provided on the drawer plate 110. When the tray 120 is accommodated in the groove, its upper surface is basically flush with the upper surface of the drawer plate 110 or slightly lower than the upper surface of the drawer plate 110. The groove is provided with a notch 113 to facilitate the removal and placement of the tray 120.

[0042] In one embodiment, the incident window material of the proportional counter tube 220 is an aluminum-coated Mylar film with an effective diameter of Φ50 mm and a thickness of about 0.2 mg / cm2, which facilitates the entry of particles with weak penetrating power such as α and β into the proportional counter tube 220 .

[0043] When in use, first, pull the handle 111 to move the draw plate 110 until the stop block 131 abuts against the slider 160, the tray 120 and the probe assembly 200 are staggered, and the sample is placed on the tray 120. The handle 111 is held to push the draw plate 110. During the movement of the draw plate 110, the buffer groove 112 abuts against the ball plunger 150 to bring about damping in the horizontal direction, which can effectively reduce the vibration of the sample caused by the non-uniform motion during the movement, which is conducive to maintaining the stability of the sample shape. When the stopping wall 1122 abuts against the ball plunger 150, the drawer 110 moves to the detection position, so that the sample tray 120 faces the detection window 250, and the α and β radiation light of the sample enters the proportional counter tube 220 from the incident window of the proportional counter tube 220. The proportional counter tube 220 converts the α and β radiation information into electronic pulse signals and outputs the signals through the preamplifier circuit 270 and the preamplifier cable 271, and the amplitude of the output electronic pulse signal is proportional to the energy of the incident particles.

[0044] The airflow proportional counter module provided by the present invention effectively reduces the contact between the proportional counter tube and the external environment by arranging the proportional counter tube in a shielding shell, thereby increasing the electromagnetic shielding effect, reducing the interference of the ambient temperature and humidity on the detection signal, improving the accuracy of the detection signal of the proportional counter tube, and reducing the detection background; by connecting and fixing the fixed block and the fixed plate, the relative position of the proportional counter tube and the shell detection window is fixed, so that the distance between the incident proportional counter tube and the sample remains stable, which is conducive to improving the efficiency and accuracy of sample detection, and is convenient for assembly and mass production. Through the buffering design of the buffer groove and the ball plunger, the vibration of the pumping plate can be effectively reduced during the process of using the pumping plate to transport the sample, and the risk of sample scattering can be reduced. Through the adsorption design of the first magnetic suction member and the second magnetic suction member, the relative position of the sample and the proportional counter tube can be kept stable during the sample detection process, reducing the risk of reduced detection accuracy due to accidental sliding of the pumping plate.

[0045] Those skilled in the art will appreciate that the above-mentioned embodiments are specific examples for implementing the present invention, and in actual applications, various changes may be made thereto in form and detail without departing from the spirit and scope of the present invention.

Claims

1. A gas flow proportional counter module, characterized in that: The invention comprises a sample delivery component (100) and a probe component (200), wherein the sample delivery component (100) comprises a base (170) and a draw plate (110) slidably connected to the base (170), wherein a tray (120) for placing a sample is provided on the draw plate (110); and the probe component (200) comprises a proportional counter tube (220) arranged above the tray (120), wherein a shielding shell (210) is provided outside the proportional counter tube (220), and wherein the shell (210) is fixedly connected to the base (170).

2. The gas flow proportional counter module according to claim 1, characterized in that: The housing (210) and the tray (120) are provided with a detection window (250) facing each other, and the incident window of the proportional counter tube (220) is arranged corresponding to the detection window (250).

3. The gas flow proportional counter module according to claim 1, characterized in that: A preamplifier circuit (270) electrically connected to the anode of the proportional counter tube (220) is disposed in the housing (210), and the preamplifier circuit (270) outputs signals via a preamplifier cable (271).

4. The gas flow proportional counter module according to claim 3, characterized in that: The outer cover of the preamplifier circuit (270) is provided with a shielding cover.

5. The gas flow proportional counter module according to claim 3, characterized in that: An outlet plug (280) is provided at one end of the front-end cable (271) leading out of the housing (210), and the outlet plug (280) is conductive foam.

6. The gas flow proportional counter module according to claim 1, characterized in that: The housing (210) is made of copper.

7. The gas flow proportional counter module according to claim 1, characterized in that: The base (170) is fixedly provided with a slider (160) along the axial direction, and the draw plate (110) and the slider (160) are provided with slide rails (130) correspondingly, and the draw plate (110) can be linearly displaced along the axial direction relative to the base (170) through the cooperation between the slide rails (130) and the slider (160).

8. The gas flow proportional counter module according to claim 7, characterized in that: A stop block (131) is provided at one end of the slide rail (130), and the stop block (131) can stop with the slider (160) to limit the linear movement of the draw plate (110).

9. The gas flow proportional counter module according to claim 1, characterized in that: A ball plunger (150) is fixedly arranged on the base (170); a buffer groove (112) is arranged on the draw plate (110) corresponding to the ball plunger (150); the buffer groove (112) is provided with a bottom surface (1121) and a stop wall (1122); the ball plunger (150) abuts against the bottom surface (1121) of the buffer groove (112); the stop wall (1122) can stop the ball plunger (150) axially upward along the draw plate (110), thereby limiting the linear movement of the draw plate (110).

10. The gas flow proportional counter module according to claim 9, characterized in that: The bottom surface (1121) is an inclined surface, and the vertical distance between the end of the inclined surface close to the stop wall (1122) and the ball plunger (150) is smaller than the vertical distance between the end of the inclined surface far from the stop wall (1122) and the ball plunger (150).

11. The gas flow proportional counter module according to claim 1, characterized in that: A first magnetic attraction component (140) is fixedly provided on the base (170), and a second magnetic attraction component (114) is correspondingly provided on the draw plate (110). When the tray (120) and the incident window of the proportional counter tube (220) are directly opposite, the first magnetic attraction component (140) and the second magnetic attraction component (114) are close to each other and are attracted to each other.

12. The gas flow proportional counter module according to claim 11, characterized in that: The first magnetic attraction component (140) and / or the second magnetic attraction component (114) is a magnet.

13. The gas flow proportional counter module according to claim 1, characterized in that: The probe assembly (200) further comprises an air supply pipe and an air outlet pipe (222) connected to the proportional counter tube (220); the air supply pipe and the air outlet pipe (222) are connected to an external air source via an air pipe joint (260).

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