Detection device for trace radioactive elements in silicon dioxide powder

Abstract

The present invention discloses a detection device for trace radioactive elements in silica powder, comprising a reaction box, a silo, a fluorescent ring assembly, a converter and a controller, wherein a reaction chamber is formed inside the reaction box; the silo is used to hold silica powder and is provided with a discharge port connected to the reaction chamber; the fluorescent ring assembly is arranged in the reaction chamber to react with the radioactive elements in the silica powder and generate a light signal; the converter is arranged in the reaction chamber and docked with the fluorescent ring assembly, the converter is used to collect the light signal and convert the light signal into an electrical signal; the controller is connected to the converter to output the detection result of the radioactive elements in the silica powder. The detection device of the present invention has the advantages of simple structure, low cost, easy operation, real-time detection, high detection accuracy, ability to detect low-equivalent radioactive elements, and can be integrated into a production line.

Description

Technical Field

[0001] The present invention relates to the technical field of nuclear radiation photoelectric conversion, in particular to a device for detecting trace radioactive elements in silicon dioxide powder. Background Art

[0002] If radioactive elements such as U238 and Th234 are present in the packaging materials of semiconductor memory chips, such as DRAM (dynamic random access memory), SRAM (static random access memory), register banks, caches, and configuration register devices, exceeding a certain concentration, the alpha particle radiation produced by their nuclear decay travels through the silicon lattice within the memory cells (flip-flops, registers, or random access memory cells) of very large circuits, generating a large number of electron holes. When the charge of these charged particles reaches the threshold charge of the chip's memory cells, they can cause bit flips, leading to single-bit errors, multi-bit errors, and soft failures such as latch-up, altering stored data and ultimately causing system errors or even crashes. With the increasing number of memory chip layers, narrowing nanowire widths, and the widespread use of cloud storage networks, the damage caused by radioactive elements will become increasingly severe, similar to how high-energy cosmic particles can disrupt the narrow circuitry of a deep-space satellite integrated circuit with a single bullet. Therefore, effectively controlling radioactive elements within safe limits in packaging materials remains a technical challenge. Therefore, in the chip manufacturing process, how to detect whether the silica powder contains radioactive elements and whether the radioactive elements exceed the standard is extremely important in engineering practice and large-scale raw material testing.

[0003] We use a specialized testing process to control radioactive elements within the 0.5 PPB range, fundamentally eliminating the risk of soft failures in storage and significantly improving the pass rate of memory chips. The World Health Organization sets the upper limit of uranium radiation in domestic water at 30 PPB. Typically, it ranges from 3 to 5 PPB, with fluctuations in spring, summer, autumn, and winter. The average radiation equivalent in the natural environment is 0.23 μSv / hr. This average background radiation consists of four components: cosmic rays from the sky contribute 17%, surface radiation contributes 21%, food and human radiation contribute 13%, and natural radiation from building materials contributes up to 49%.

[0004] Most existing detectors are handheld detectors. Usually, the minimum equivalent range of handheld detectors is 0.01μSv / hr to 0.001μSv / hr. They are relatively expensive, costing more than US$100,000 each. They are not convenient to integrate into professional automated assembly line production environments and can only be used for manual sampling, such as scintillation counters.

[0005] In 1947, American physicist J.W. Coltman and German-American physicist Hartmut Kallmann (1890–) demonstrated that a scintillation counter, consisting of a scintillator, a photomultiplier tube, and electronic instruments, could be used to detect radiation with greater efficiency than a Geiger-Müller counter. A scintillation counter consists of three main components: a scintillator, a light-collecting element, and a photoelectric converter. Many substances can be excited to emit light upon incident particles. Scintillators can be solid, liquid, or gaseous, and are categorized by their chemical properties into inorganic and organic scintillators. The advantages of a scintillation counter include high efficiency and excellent temporal and spatial resolution, reaching 1 nanosecond and millimeter levels. It can detect not only various charged particles but also various uncharged nuclear radiation. It can detect not only the presence of nuclear radiation but also its nature and type. It can count radiation but also determine the energy of the radiating particles based on the pulse amplitude. While the energy resolution of a scintillation detector is not as good as that of a semiconductor detector, it is more adaptable to the environment. In particular, the timing performance, neutron and gamma resolution and internal counting ability of organic scintillators all have unique advantages and are widely used in nuclear physics and particle physics experiments, isotope measurements and radioactivity monitoring.

[0006] However, in the existing technology, handheld nuclear radiation measuring instruments, including scintillation counters, have simple probe structures, relatively large additional pointing interference errors, and are inconvenient to integrate into process flows. They are also easily affected by the surrounding background radiation environment, resulting in a decrease in the accuracy of weak radiation measurements. They are only suitable for high and medium equivalent on-site detection and it is difficult to achieve the ideal low-equivalent and low-cost measurement requirements and effects on the production line.

[0007] The above content is only used to assist in understanding the technical solution of the invention and does not constitute an admission that the above content is prior art. Summary of the Invention

[0008] The main purpose of the present invention is to provide a detection device for trace radioactive elements in silica powder, aiming to improve the detection sensitivity of the detection device to radioactive elements in silica powder, thereby improving its accuracy in radiation identification.

[0009] To achieve the above objectives, the present invention provides a device for detecting trace radioactive elements in silicon dioxide powder, comprising:

[0010] A reaction box having a reaction chamber formed therein;

[0011] A silo for storing silicon dioxide powder, and provided with a discharge port connected to the reaction chamber;

[0012] a fluorescent ring assembly, disposed in the reaction chamber, for reacting with the radioactive elements in the silica powder and generating a light signal;

[0013] a converter, disposed in the reaction chamber and docked with the fluorescent ring assembly, the converter being used to collect the optical signal and convert the optical signal into an electrical signal;

[0014] A controller is connected to the converter and is used to output the detection result of the radioactive elements in the silicon dioxide powder.

[0015] In one embodiment, the detection device for trace radioactive elements in silica powder further includes a flow guide component, and the flow guide component further includes a connected inlet pipe and an air pump. The inlet pipe connects the reaction chamber with the silo and is used to introduce the silica powder in the silo into the reaction chamber. The air pump is used to adjust the speed at which the silica powder in the silo is introduced into the reaction chamber.

[0016] In one embodiment, the fluorescent ring assembly includes a first fluorescent ring, a second fluorescent ring, and a third fluorescent ring. The first fluorescent ring, the second fluorescent ring, and the third fluorescent ring are all connected to the converter and are used to react with α particles, β particles, and γ particles respectively.

[0017] In one embodiment, the first fluorescent ring is a scintillator containing cesium iodide, and / or the second fluorescent ring is a scintillator containing sodium iodide, and / or the third fluorescent ring is a scintillator containing bismuth germanium.

[0018] In one embodiment, the device for detecting trace radioactive elements in silica powder also includes a light valve connected to the converter. By controlling the opening and closing of the light valve in each band, the converter can selectively collect the light signals generated by the first fluorescent ring and / or the second fluorescent ring and / or the third fluorescent ring and convert them into corresponding electrical signals.

[0019] In one embodiment, the converter includes a connected probe and a conversion unit, the probe is used to collect the light signals generated by the first fluorescent ring and / or the second fluorescent ring and / or the third fluorescent ring, and the conversion unit is used to convert the light signals collected by the probe into electrical signals, the first fluorescent ring, the second fluorescent ring and the third fluorescent ring can be slidably mounted on the outer periphery of the probe, and the distances between the first fluorescent ring, the second fluorescent ring and the third fluorescent ring and the end of the introduction tube can be adjusted.

[0020] In one embodiment, the device for detecting trace radioactive elements in silica powder also includes an audio relay connected to the controller, and the controller can output a first instruction and / or a second instruction to the audio relay. The audio relay adjusts the air pressure of the air pump under the first instruction, and the audio relay adjusts the opening and closing of the light valve in each band under the second instruction.

[0021] In one embodiment, the detection device for trace radioactive elements in silica powder also includes an amplifying filter connected to the audio relay, the amplifying filter includes an amplifying unit and a filtering unit, the output end of the amplifying unit is connected to the input end of the filtering unit, the input end of the amplifying unit is connected to the output end of the converter, and the output end of the filtering unit is connected to the controller, the amplifying unit is used to amplify the electrical signal output by the converter, and the filtering unit is used to independently filter the electrical signal output by the amplifying unit and transmit the filtered electrical signals of each band to the controller in a superimposed manner.

[0022] In one embodiment, the flow guide assembly further includes a reflux pipe, one end of which extends into the reaction chamber and the other end is connected to the air pump, so that the silica powder in the reaction chamber can flow back into the silo through the reflux pipe.

[0023] In one embodiment, the air pump is a circulating air pump, and the end of the flow guide tube is bent toward the fluorescent ring assembly.

[0024] The technical solution of the present invention integrates the reaction box, the silo, the fluorescent ring assembly, the converter and the controller into a detection device, which not only improves the detection accuracy of the detection device for radioactive elements in silica powder, but also makes the detection device easy to integrate into the chip production line. In the technical solution of the present invention, since the silica powder and the fluorescent ring assembly react in the reaction chamber, the reaction box reduces the influence of the external environment on the detection results, greatly reduces the additional interference error caused by background radiation, and thus greatly improves the detection accuracy, so that the detection device of the present invention can accurately detect low-equivalent radioactive elements in silica powder; on the other hand, the detection device of the present invention can detect large quantities of silica powder at one time, which is easy to integrate into the production line, solving the problem that existing detection devices cannot be integrated into the production line. The detection device for detecting trace radioactive elements in silica powder of the present invention has the advantages of simple structure, low cost, easy operation, real-time detection, high detection accuracy, ability to detect low-equivalent radioactive elements and can be integrated into the production line. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0026] Figure 1 It is a schematic structural diagram of a device for detecting trace radioactive elements in silicon dioxide powder according to the present invention;

[0027] Figure 2 Schematic diagram of the decay of the first 2 steps and the last 12 steps of the half-life chain of uranium.

[0028] Description of Figure Numbers:

[0029] Label name Label name 10 reaction box 10a reaction chamber 20 Silo 30 Fluorescent ring assembly 31 First fluorescent ring 33 Second fluorescent ring 35 The third fluorescent ring 40 converter 41 Probe 43 Conversion Unit 50 Diversion components 51 Introduction tube 53 reflux pipe 55 air pump 551 Pump body 553 air valve 60 light valve 70 Audio relay 80 Controller 90 Amplification filter

[0030] The purpose, features and advantages of the present invention will be further described with reference to the accompanying drawings and in conjunction with the embodiments. DETAILED DESCRIPTION

[0031] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0032] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indications will also change accordingly.

[0033] In addition, if the embodiments of the present invention include descriptions of "first," "second," etc., these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of the technical features indicated. Therefore, features specified as "first" or "second" may explicitly or implicitly include at least one of these features. Furthermore, if "and / or" appears throughout the text, it means including three parallel solutions. For example, "A and / or B" includes Solution A, Solution B, or solutions that meet both requirements A and B. Furthermore, the technical solutions of the various embodiments may be combined, but this must be based on the ability of a person of ordinary skill in the art to implement them. If the combination of technical solutions is inconsistent or unimplementable, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection claimed by the present invention. As used herein, "includes," "comprising," "containing," "having," or other variations are intended to encompass non-exclusive inclusions, and no distinction is made between these terms. The term "comprising" means that other steps and components may be added without affecting the final result. The term "comprising" also encompasses the terms "mainly consisting of" and "essentially consisting of." The compositions and methods / processes of the present invention comprise, consist of, and consist essentially of the essential elements and limitations described herein, as well as any additional or optional ingredients, components, steps, or limitations described herein.

[0034] The present invention provides a device for detecting trace radioactive elements in silicon dioxide powder.

[0035] See also Figure 1 In an embodiment of the present invention, the detection device includes a reaction box 10, a silo 20, a flow guide assembly 50, a fluorescent ring assembly 30, a converter 40, and a controller 80. A reaction chamber 10a is formed inside the reaction box 10, and a discharge port is provided on the silo 20. The flow guide assembly 50 includes an inlet pipe 51, the end of which is bent toward the fluorescent ring assembly 30. The inlet pipe 51 connects the reaction chamber 10a with the silo 20 and is used to introduce the silica powder in the silo 20 into the reaction chamber 10a. The fluorescent ring assembly 30 is disposed in the reaction chamber 10a and is used to react with the radioactive elements in the silica powder and generate a light signal. The converter 40 is disposed in the reaction chamber 10a and is connected to the fluorescent ring assembly 30. The converter 40 is used to collect the light signal and convert the light signal into an electrical signal. The controller 80 is connected to the converter 40 and is used to output the detection result of the radioactive elements in the silica powder based on the electrical signal.

[0036] More specifically, the controller 80 is a computer, which is arranged outside the reaction box 10. The silo 20, the guide assembly 50, the fluorescent ring assembly 30 and the converter 40 are all sealed in the reaction box 10. The reaction box 10 is a light-proof, nuclear radiation-proof and heat-dissipating box to avoid the external environment from affecting the reaction process between the radioactive elements in the silica powder to be tested and the fluorescent ring assembly 30, thereby improving the detection sensitivity. In one embodiment, the material of the reaction box 10 is metallic lead, and the reaction box 10 includes a lower box body and an upper cover plate. The lower box body is in the shape of a semi-rugby ball, and the upper cover plate is a flat-top semicircular shape that matches the lower box body. The upper cover plate covers the lower box body to achieve the purpose of sealing and radiation protection. The converter 40 is arranged in the middle of the reaction chamber 10a, and the converter 40 includes a connected probe 41 and a conversion unit 43. The probe 41 is an oblique columnar structure and is vertically arranged in the reaction chamber 10a. The fluorescent ring assembly 30 is sleeved on the periphery of the probe 41, and the probe 41 is used to The optical signal generated by the fluorescent ring assembly 30 is collected, and the conversion unit 43 is used to convert the optical signal collected by the probe 41 into an electrical signal; the cavity wall of the reaction chamber 10a is all silver-plated, and the reaction light generated by the outer curved surface of the fluorescent ring assembly 30 is emitted outward and reaches the cavity wall of the reaction chamber 10a. After one or more reflections, it is finally focused back to the fluorescent ring assembly 30. The reaction light generated by the inner curved surface of the fluorescent ring assembly 30 is directly focused once onto the probe 41 located at its center. The fluorescent ring assembly 30 acts as a focusing lens and is responsible for secondary focusing the light through the probe 41 to the conversion unit 43.

[0037] The flow guide assembly 50 further includes a first outlet pipe, a second outlet pipe and a return pipe 53. One end of each of the first outlet pipe and the second outlet pipe is arranged in the reaction chamber 10a, and the other end extends out of the reaction box 10. When it is detected that the radioactive element content in the silica powder does not exceed the standard, the qualified silica powder in the reaction chamber 10a is guided to the first loading box through the first outlet pipe, and then the first loading box carries the qualified silica powder to the next station in the production line for processing; when the radioactive element content in the silica powder is detected to be within the standard, the first loading box carries the qualified silica powder to the next station in the production line for processing. When the content of radioactive elements exceeds the standard, the unqualified silica powder in the reaction chamber 10a is guided to the second loading box through the second outlet pipe, and then the second loading box carries the unqualified silica powder to the previous workstation in the production line for rework to remove radioactive elements; one end of the reflux pipe 53 extends into the reaction chamber 10a, and the other end is connected to the silo 20. When the silica powder in the reactor needs to be tested multiple times, the silica powder in the reaction chamber 10a flows back to the silo 20 to wait for re-testing.

[0038] It should be noted that before performing radiation testing on silica powder, the system's final equivalent reading must be calibrated using a reference sample with a standard radiation equivalent under standard temperature, standard flow rate, standard flow velocity, and standard light wavelength. During radiation testing of silica powder, the reaction temperature between the silica powder and the fluorescent ring assembly 30 can be controlled to obtain electrical signal waveforms at different temperatures. Multiple tests can be performed at the same temperature, and the corresponding waveforms analyzed to obtain test results. Comprehensive analysis and data fusion of multiple test results can further improve the accuracy and precision of the test.

[0039] The reaction temperature between the silica powder to be tested and the fluorescent ring assembly 30 can be controlled by providing a constant temperature environment. For example, the detection device can be placed in a constant temperature environment and the temperature requirement can be met after the overall temperature stabilizes. Those skilled in the art can set a specific reaction temperature based on the detection requirements to meet the needs of different detection processes, and this is not particularly limited here.

[0040] The technical solution of the present invention integrates the reaction box 10, the silo 20, the fluorescent ring assembly 30, the converter 40 and the controller 80 into a detection device, which not only improves the detection accuracy of the detection device for radioactive elements in silica powder, but also makes the detection device easy to integrate into the chip production line. In the technical solution of the present invention, since the silica powder and the fluorescent ring assembly 30 react in the reaction chamber 10a, the reaction box 10 reduces the influence of the external environment on the detection results, greatly reduces the additional interference error caused by background radiation, and thus greatly improves the detection accuracy, so that the detection device of the present invention can accurately perform low-equivalent detection of radioactive elements in silica powder; on the other hand, the detection device of the present invention can detect large quantities of silica powder at one time, which is easy to integrate into the production line, solving the problem that the existing detection device cannot be integrated into the production line. The device for detecting trace radioactive elements in silicon dioxide powder of the present invention has the advantages of simple structure, low cost, easy operation, real-time detection, high detection accuracy, ability to detect low-equivalent radioactive elements, and ability to be integrated into a production line.

[0041] Furthermore, the flow guide assembly 50 also includes an air pump 55, which is connected to the inlet pipe 51 and the return pipe 53. The air pump 55 is used to adjust the speed at which the silica powder in the silo 20 is introduced into the reaction chamber 10a, and to adjust the speed at which the silica powder in the reaction chamber 10a flows back into the silo 20. Under the action of the air pump 55, the inlet pipe 51 is able to guide the silica powder in the silo 20 into the reaction chamber 10a at high pressure. In one embodiment, the air pump 55 is a circulating air pump 55, which introduces a tornado-like vortex of high-speed circulating gas into the inlet pipe 51, thereby creating more one-on-one contact opportunities between the silica powder to be tested and the fluorescent ring assembly 30, enhancing the intensity of the optical signal generated by the reaction between the silica powder to be tested and the fluorescent ring assembly 30, thereby allowing more optical signals to be collected by the converter 40, resulting in more accurate detection results.

[0042] The air pump 55 includes a pump body 551 and an air valve 553 connected thereto. The pump body 551 is in communication with the inlet pipe 51. The air valve 553 is used to control the air pressure in the pump body 551, thereby controlling the speed at which the inlet pipe 51 introduces the silica powder into the reaction chamber 10a. If the speed at which the silica powder is introduced into the reaction chamber 10a is controllable, the silica powder to be tested can be introduced into the reaction chamber 10a in batches to react with the fluorescent ring assembly 30. This can generate multiple sets of test results, allowing for comprehensive analysis of the test results and improving the accuracy of the test results.

[0043] Furthermore, the fluorescent ring assembly 30 can react with α particles, β particles and γ particles and generate corresponding light signals.

[0044] See also Figure 2 Because the natural abundance of U is as high as 99%, it is a trace radioactive element. During its decay, U primarily releases three radioactive elements: α, β, and γ. Therefore, in the chip manufacturing process, to detect whether the radioactive elements in the raw material silica powder exceed the standard on the assembly line, it is only necessary to focus on detecting whether the α heavy particle radiation, β light particle radiation, and γ light wave radiation in the silica powder exceed the standard. Therefore, to further improve detection accuracy and reduce device cost, the device for detecting trace radioactive elements in silica powder of the present invention only needs to detect whether the content of α particles, β particles, and γ particles in the silica powder exceeds the standard. That is, the fluorescent ring assembly 30 of the present invention is made of a material that reacts with α particles, β particles, and γ particles to generate light signals.

[0045] Specifically, the fluorescent ring assembly 30 is composed of a scintillator. The principle of the reaction between the scintillator and the radioactive element is as follows: the energy levels of isolated atoms in the scintillator overlap and intersect to form crystal energy bands. These energy bands can be divided into valence bands and conduction bands, with a certain width of band gap between them. When ionizing radiation enters the crystal, electrons originally in the valence band are excited and transition to the conduction band. After a period of time (typically about 0.1 microseconds), the electrons de-excite back to the valence band, releasing photons in this process. The photon energy is equal to the difference between the energy of the electron before and after the transition. Generally, the band gap is wide, so the energy of the photons released by the transition is high, exceeding the visible light range and entering the ultraviolet light range. If impurities such as Tl (activators) are doped into the scintillator crystal, some local energy levels can be generated in the original band gap. In this way, electrons may fall into these local energy levels when they are excited and de-excited again. The corresponding energy difference is also smaller than before, so the energy of the photons released by de-excitation is lower than before, that is, falling into the visible light range.

[0046] Scintillators can be solid, liquid, or gaseous, and can be divided into two major categories based on their chemical properties: inorganic and organic. Solid inorganic scintillators generally refer to inorganic salt crystals containing a small amount of an activator mixture. Adding an activator to pure inorganic salt crystals significantly improves their luminescence efficiency. The most commonly used inorganic crystal is sodium iodide (SIO) crystal activated with thallium, which can be as large as 500 mm in diameter and has high luminescence efficiency and gamma-ray detection efficiency. Other inorganic crystals include cesium iodide (TH), lithium iodide (EUR), and zinc sulfide (AG), each with its own unique characteristics. Newly emerging inorganic crystals include bismuth germanate semiconductors. Gas and liquid inorganic scintillators are often made from inert gases and their liquefied forms, such as xenon, krypton, argon, neon, and helium. Organic scintillators are mostly aromatic hydrocarbons with a benzene ring structure and can be divided into organic crystal scintillators, liquid scintillators, and plastic scintillators. Organic crystals, such as anthracene, stilbene, and naphthalene, have high fluorescence efficiency but are difficult to manufacture in large volumes. Both liquid and plastic scintillators are composed of a solvent, a solute, and a wavelength converter, but the difference is that the solvent in plastic scintillators is solid at room temperature. Radioactive samples to be tested can also be dissolved in liquid scintillators, and this "windowless" scintillator can effectively react with very low-energy radiation. Liquid and plastic scintillators can be easily manufactured in various shapes and sizes. Plastic scintillators can also be manufactured into optical fiber rings, facilitating focused coupling with optoelectronic devices under various geometric conditions. Those skilled in the art can select different types of scintillators to manufacture the fluorescent ring assembly 30 based on different detection requirements.

[0047] In one embodiment, the fluorescent ring assembly 30 includes a first fluorescent ring 31, a second fluorescent ring 33, and a third fluorescent ring 35. The first fluorescent ring 31, the second fluorescent ring 33, and the third fluorescent ring 35 are all connected to the probe 41 and are respectively configured to react with alpha particles, beta particles, and gamma particles. The first fluorescent ring 31, the second fluorescent ring 33, and the third fluorescent ring 35 are all transparent crystals, typically made of crystal phosphor, transparent anthracene plastic, or a plastic-encapsulated organic liquid. They emit fluorescence when exposed to ionizing radiation. In a typical embodiment, the first fluorescent ring 31 is a scintillator containing cesium iodide, the second fluorescent ring 33 is a scintillator containing sodium iodide, and the third fluorescent ring 35 is a scintillator containing bismuth germanium.

[0048] In one embodiment, the probe 41 is a fiber optic probe, the conversion unit 43 is a photomultiplier tube or an avalanche diode, the first fluorescent ring 31, the second fluorescent ring 33 and the third fluorescent ring 35 are arranged on the periphery of the probe 41, and the probe 41 is used to collect the light signals generated by the first fluorescent ring 31 and / or the second fluorescent ring 33 and / or the third fluorescent ring 35, and the conversion unit 43 is used to convert the light signals collected by the probe 41 into electrical signals and amplify them.

[0049] Based on the above embodiment, in one embodiment, the first fluorescent ring 31, the second fluorescent ring 33, and the third fluorescent ring 35 can all be slidably mounted on the outer periphery of the probe 41, and the distances between the first fluorescent ring 31, the second fluorescent ring 33, and the third fluorescent ring 35 and the end of the introduction tube 51 can be adjusted. In the technical solution of the present invention, changes in the introduction speed of the silica powder into the reaction chamber 10a affect the movement trajectory of the silica powder after it is discharged from the introduction tube 51, thereby affecting the contact area between the silica powder and the first fluorescent ring 31, the second fluorescent ring 33, and the third fluorescent ring 35, thereby affecting the intensity of the light signals generated by the first fluorescent ring 31, the second fluorescent ring 33, and the third fluorescent ring 35. By sliding and adjusting the first fluorescent ring 31, the second fluorescent ring 33, and the third fluorescent ring 35 to an appropriate height, the contact area between the silica powder and the first fluorescent ring 31, the second fluorescent ring 33, and the third fluorescent ring 35 can be maximized, thereby improving detection accuracy.

[0050] In the above embodiment, the converter 40 can simultaneously collect the optical signals generated by the first fluorescent ring 31, the second fluorescent ring 33, and the third fluorescent ring 35, and can also selectively collect the optical signals generated by one or both of the first fluorescent ring 31, the second fluorescent ring 33, and the third fluorescent ring 35. Generally, silica powder does not emit α-rays, β-rays, and γ-rays simultaneously, and often even emits only one of the three types of radiation. Based on this, in the detection device of the present invention, the converter 40 can selectively collect the optical signals generated by the first fluorescent ring 31, the second fluorescent ring 33, or the third fluorescent ring 35, thereby increasing the sensitivity of the converter 40 to each wavelength band. This can further enhance the visualization of the detection results output by the controller 80 and avoid unrecognizable results due to waveform amplitudes being too small or too large due to wavelength sensitivity.

[0051] In one embodiment, the detection device further includes a light valve 60 connected to the converter 40. By controlling the opening and closing of the light valve 60 in each wavelength band, the photoelectric sensor can selectively collect the light signals generated by the first fluorescent ring 31 and / or the second fluorescent ring 33 and / or the third fluorescent ring 35 and convert them into corresponding electrical signals, thereby further improving the sensitivity of the converter 40 and thus improving the detection accuracy of the detection device.

[0052] In one embodiment, the detection device also includes an audio relay 70 connected to the controller 80. The controller 80 can output a first instruction and / or a second instruction to the audio relay 70. The audio relay 70 adjusts the air pressure of the air pump 55 under the first instruction, and the audio relay 70 adjusts the opening and closing of the light valve 60 in each band under the second instruction, so that the detection process is automated and the detection can be carried out smoothly without human intervention, thereby reducing the labor consumption of nuclear protection.

[0053] In more detail, the audio relay 70 is connected to the controller 80 via a first high-fidelity audio cable, and the controller 80 transmits the first control instruction and the second control instruction to the audio relay 70 via the first high-fidelity audio cable; the controller 80 is connected to the converter 40 via a second high-fidelity audio cable; the outer peripheries of the first high-fidelity audio cable and the second high-fidelity audio cable are wrapped with shielding tape to avoid interference with the signal during transmission, which is conducive to making the detection results more accurate.

[0054] In one embodiment, the detection device further includes an amplifying filter 90 connected to the audio relay 70, which responds to and matches the spectra of three types of rays (α rays, β rays, and γ rays). The amplifying filter 90 includes an amplifying unit and a filtering unit. The input end of the amplifying unit is connected to the output end of the converter 40 through the audio relay 70, the output end of the amplifying unit is connected to the input end of the filtering unit, and the output end of the filtering unit is connected to the controller 80 through the audio relay 70. The amplifying unit is used to amplify the strength of the electrical signal output by the converter 40. The filtering unit is used to independently filter the electrical signal output by the amplifying unit and superimpose the filtered electrical signals of each band. The signals are then transmitted to the controller 80 via high-fidelity wiring shared with the audio relay 70. The controller 80 outputs the detection equivalent result of the radioactive element in the measured silica powder based on the electrical signal output by the filter. The controller 80 is responsible for implementing digital filtering and intelligent error statistics, which can improve the intelligent noise removal and visualization of the detection result output by the controller 80. Since the amplifier amplifies the effective voltage of the electrical signal, it also amplifies the noise signal. The filtering process performed by the filter improves the signal-to-noise ratio, avoids the influence of interference noise, and is conducive to further improving the precision and accuracy of the detection device.

[0055] The foregoing examples are merely illustrative and serve to illustrate some of the features of the method of the present invention. The appended claims are intended to claim the widest possible scope that can be envisioned, and the embodiments presented herein are merely illustrative of selected implementations according to a combination of all possible embodiments. Therefore, it is the applicant's intention that the appended claims are not limited by the selection of examples illustrating the features of the present invention. Some numerical ranges used in the claims also include subranges therein, and variations in these ranges should also be interpreted as being covered by the appended claims where possible.

Claims

1. A device for detecting trace radioactive elements in silicon dioxide powder, characterized in that: include: A reaction box having a reaction chamber formed therein; A silo for storing silicon dioxide powder, and provided with a discharge port connected to the reaction chamber; a fluorescent ring assembly, disposed in the reaction chamber, for reacting with the radioactive elements in the silica powder and generating a light signal; a converter, disposed in the reaction chamber and docked with the fluorescent ring assembly, the converter being used to collect the optical signal and convert the optical signal into an electrical signal; a controller connected to the converter and configured to output a detection result of radioactive elements in the silicon dioxide powder; A flow guide assembly, the flow guide assembly also includes a connected inlet pipe and a circulating air pump, and also includes a reflux pipe, the inlet pipe connects the reaction chamber with the silo and is used to introduce the silica powder in the silo into the reaction chamber, the circulating air pump is used to pass circulating gas into the inlet pipe to adjust the speed at which the silica powder in the silo is introduced into the reaction chamber; one end of the reflux pipe extends into the reaction chamber, and the other end is connected to the circulating air pump, the silica powder in the reaction chamber can be refluxed into the silo through the reflux pipe, and the circulating air pump is also used to adjust the speed at which the silica powder in the reaction chamber flows back into the silo; The fluorescent ring assembly includes a first fluorescent ring, a second fluorescent ring and a third fluorescent ring. The first fluorescent ring, the second fluorescent ring and the third fluorescent ring are all connected to the converter and are used to react with alpha particles, beta particles and gamma particles respectively.

2. The device for detecting trace radioactive elements in silicon dioxide powder according to claim 1, wherein: The first fluorescent ring is a scintillator containing cesium iodide, and / or the second fluorescent ring is a scintillator containing sodium iodide, and / or the third fluorescent ring is a scintillator containing bismuth germanium.

3. The device for detecting trace radioactive elements in silicon dioxide powder according to claim 1, wherein: It also includes a light valve connected to the converter. By controlling the opening and closing of the light valve in each band, the converter can selectively collect the light signals generated by the first fluorescent ring and / or the second fluorescent ring and / or the third fluorescent ring and convert them into corresponding electrical signals.

4. The device for detecting trace radioactive elements in silicon dioxide powder according to claim 3, wherein: The converter includes a connected probe and a conversion unit, the probe is used to collect the light signals generated by the first fluorescent ring and / or the second fluorescent ring and / or the third fluorescent ring, and the conversion unit is used to convert the light signals collected by the probe into electrical signals. The first fluorescent ring, the second fluorescent ring and the third fluorescent ring can be slidably mounted on the outer periphery of the probe, and the distances between the first fluorescent ring, the second fluorescent ring and the third fluorescent ring and the end of the introduction tube can be adjusted.

5. The device for detecting trace radioactive elements in silicon dioxide powder according to claim 1, wherein: It also includes an audio relay connected to the controller, and the controller can output a first instruction and / or a second instruction to the audio relay. The audio relay adjusts the air pressure of the air pump under the first instruction, and the audio relay adjusts the opening and closing of the light valve in each band under the second instruction.

6. The device for detecting trace radioactive elements in silicon dioxide powder according to claim 1, wherein: It also includes an amplifying filter connected to the audio relay, the amplifying filter includes an amplifying unit and a filtering unit, the output end of the amplifying unit is connected to the input end of the filtering unit, the input end of the amplifying unit is connected to the output end of the converter, and the output end of the filtering unit is connected to the controller. The amplifying unit is used to amplify the electrical signal output by the converter, and the filtering unit is used to independently filter the electrical signal output by the amplifying unit and superimpose the filtered electrical signals of each band and transmit them to the controller.

7. The device for detecting trace radioactive elements in silicon dioxide powder according to any one of claims 1 to 6, characterized in that: The end of the introduction tube is bent toward the fluorescent ring assembly.

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