CN115616648A

CN115616648A - Detection device for trace radioactive elements in silicon dioxide powder

Info

Publication number: CN115616648A
Application number: CN202211171122.8A
Authority: CN
Inventors: 柯瑞林; 王玲; 黄佳敏; 黄骏; 柯冰; 王�锋; 杨艳
Original assignee: Shenzhen Shangou New Material Co ltd
Current assignee: Shenzhen Shangou New Material Co ltd
Priority date: 2022-09-23
Filing date: 2022-09-23
Publication date: 2023-01-17

Abstract

The invention discloses a detection device for trace radioactive elements in silicon dioxide powder, which comprises a reaction box, a storage bin, a fluorescent ring assembly, a converter and a controller, wherein a reaction cavity is formed in the reaction box; the bin is used for containing silicon dioxide powder and is provided with a discharge hole communicated with the reaction cavity; the fluorescent ring assembly is arranged in the reaction cavity and is used for reacting with radioactive elements in the silicon dioxide powder and generating optical signals; the converter is arranged in the reaction cavity and is in butt joint with the fluorescent ring assembly, and the converter is used for collecting the optical signal and converting the optical signal into an electric signal; the controller is connected with the converter and used for outputting the detection result of the radioactive elements in the silicon dioxide powder. The detection device has the advantages of simple structure, low cost, convenience in operation, capability of real-time detection, high detection precision, capability of detecting low-equivalent radioactive elements and capability of being integrated into a production line.

Description

Detection device for trace radioactive elements in silicon dioxide powder

Technical Field

The invention relates to the technical field of nuclear radiation photoelectric conversion, in particular to a detection device for trace radioactive elements in silicon dioxide powder.

Background

In semiconductor memory chips, such as DRAM (dynamic random access memory), SRAM (static random access memory), register bank, cache, and packaging materials for configuring register devices, if radioactive elements, such as U238 and Th234 elements, exceed a certain equivalent, alpha particle rays generated by nuclear decay of the radioactive elements pass through silicon lattices in super-large-scale circuit memory cells (flip-flops, register cells, or random access memory cells), a large number of electron holes are generated, and when the charge amount of the charged particles is equal to the threshold charge amount of the memory cells of the chip, bit flipping will be caused, thereby causing soft failure problems such as single bit error, multiple bit error, and latch-up, etc., causing the stored data to change, and finally causing system errors and even breakdown. With more and more laminated layers of storage chips, narrower and narrower nanometer line width and more extensive application of cloud storage networks, the damage caused by radioactive elements is larger and larger, and the damage is similar to the situation that cosmic high-energy particles break a narrow line in a deep space satellite integrated circuit like a bullet with one gun. Therefore, it is a technical difficulty to effectively control the radioactive elements in the packaging material within the safe range. Therefore, in the manufacturing process of the chip, it is very important in engineering practice and large-scale raw material detection how to detect whether the silicon dioxide powder contains radioactive elements and whether the radioactive elements exceed the standard.

The detection is carried out by adopting a special process, the radioactive elements can be controlled in the range of 0.5PPB, the soft fault risk of storage is fundamentally eliminated, and the qualification rate of the storage chip is obviously improved. The world health organization defines that the upper limit of the domestic water uranium radiation is 30PPB, generally ranges from 3PPB to 5PPB, the average radiation equivalent of the natural environment is 0.23 mu Sv/hr, and the average background radiation comprises four components: the natural cosmic rays account for 17 percent of the natural cosmic rays, the ground surface radiation accounts for 21 percent of the natural cosmic rays, the food and human body radiation contributes 13 percent, and the natural radiation contained in the building materials accounts for 49 percent at most.

Most of the existing detectors are handheld detectors, the minimum equivalent range of the handheld detectors is usually 0.01 mu Sv/hr to 0.001 mu Sv/hr, the price is expensive, more than one hundred thousand dollars is needed, the detectors are not convenient to be integrated into a professional automatic assembly line production environment, and only manual sampling inspection purposes can be carried out, for example: and (4) flickering a counter.

Coltman (J.W. Coltman) and German physicist Kalman (Hartmut Kallmann, 1890-), U.S. 1947, demonstrated that a scintillation counter (scintillation counter) consisting of a scintillator, photomultiplier tubes and electronics can be used to detect radiation with higher efficiency than the Geiger Miller counter. The scintillation counter is composed of three main parts, namely a scintillator, a light collecting component and a photoelectric conversion device. Many substances can be excited to emit light after the particles are incident, and scintillators can be solid, liquid or gas and can be divided into two categories, namely inorganic scintillators and organic scintillators according to chemical properties. The scintillation counter has the advantages of high efficiency, good time resolution and space resolution, the time resolution reaches 1 nanosecond, and the space resolution reaches millimeter magnitude. The detector not only can detect various charged particles, but also can detect various uncharged nuclear radiation; not only can detect whether nuclear radiation exists, but also can identify the nature and the type of the nuclear radiation; not only can count, but also can determine the energy of the radiation particles according to the pulse amplitude. The energy resolution of the scintillation detector is not as good as that of a semiconductor detector, but the scintillation detector has strong adaptability to the environment. Especially, the timing performance, neutron and gamma resolution capability and liquid scintillation inner counting capability of the organic scintillator have unique advantages, and the organic scintillator is widely applied to nuclear physics and particle physics experiments, isotope measurement and radioactivity monitoring.

However, in the prior art, the probe of the handheld nuclear radiation measuring instrument including the scintillation counter has a simple structure, relatively large additional pointing interference error and inconvenient use due to integration into a process flow; and the method is easily influenced by the surrounding background radiation environment to cause the reduction of the measurement precision of weak radiation, is only suitable for the field detection of high and medium equivalent, and is difficult to achieve the special low equivalent and low cost measurement requirements and effects on an ideal production line.

The above is only for the purpose of assisting understanding of the technical solutions of the present invention, and does not represent an admission that the above is the prior art.

Disclosure of Invention

The invention mainly aims to provide a detection device for trace radioactive elements in silicon dioxide powder, aiming at improving the detection sensitivity of the detection device for the radioactive elements in the silicon dioxide powder, thereby improving the accuracy of the detection device for radiation identification.

In order to achieve the above object, the present invention provides an apparatus for detecting trace amounts of radioactive elements in silica powder, comprising:

the reaction box is internally provided with a reaction cavity;

the bin is used for containing silicon dioxide powder and is provided with a discharge hole communicated with the reaction cavity;

the fluorescent ring assembly is arranged in the reaction cavity and is used for reacting with radioactive elements in the silicon dioxide powder and generating optical signals;

the converter is arranged in the reaction cavity and is in butt joint with the fluorescent ring assembly, and the converter is used for collecting the optical signals and converting the optical signals into electric signals;

and the controller is connected with the converter and used for outputting the detection result of the radioactive elements in the silicon dioxide powder.

In an embodiment, the detection apparatus for trace radioactive elements in silica powder further includes a diversion assembly, the diversion assembly further includes a leading-in pipe and an air pump which are communicated, the leading-in pipe communicates the reaction chamber with the bin and is used for leading the silica powder in the bin into the reaction chamber, and the air pump is used for adjusting the speed of leading the silica powder in the bin into the reaction chamber.

In an embodiment, the fluorescence ring assembly comprises a first fluorescence ring, a second fluorescence ring, and a third fluorescence ring, each of which interfaces with the converter and is configured to react with alpha particles, beta particles, and gamma particles, respectively.

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 germanide.

In an embodiment, the detection apparatus for trace radioactive elements in silica powder further includes a light valve connected to the converter, and the light valve is controlled to open and close at each wavelength band, so that the converter can selectively collect and convert optical signals generated by the first fluorescent ring and/or the second fluorescent ring and/or the third fluorescent ring into corresponding electrical signals.

In an embodiment, the converter includes a probe and a conversion unit connected to each other, the probe is configured to collect optical signals generated by the first fluorescence ring and/or the second fluorescence ring and/or the third fluorescence ring, the conversion unit is configured to convert the optical signals collected by the probe into electrical signals, the first fluorescence ring, the second fluorescence ring and the third fluorescence ring are slidably sleeved on the periphery of the probe, and distances between the first fluorescence ring, the second fluorescence ring and the third fluorescence ring and the end of the introduction tube are adjustable.

In an embodiment, the device for detecting trace radioactive elements in the silica powder further includes an audio relay connected to the controller, the controller may 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 at each wavelength band under the second instruction.

In an embodiment, the detection apparatus for trace radioactive elements in silica powder further includes an amplifying filter connected to the audio relay, the amplifying filter includes an amplifying unit and a filtering unit, an output end of the amplifying unit is connected to an input end of the filtering unit, an input end of the amplifying unit is connected to an output end of the converter, an output end of the filtering unit is connected to the controller, the amplifying unit is configured to amplify the electrical signals output by the converter, and the filtering unit is configured to perform independent filtering processing on the electrical signals output by the amplifying unit and transmit the filtered electrical signals of respective wave bands to the controller in a superimposed manner.

In an embodiment, the flow guide assembly further comprises a return pipe, one end of the return pipe extends into the reaction chamber, the other end of the return pipe is communicated with the air pump, and the silica powder in the reaction chamber can flow back to the storage bin through the return pipe.

In an embodiment, the air pump is a circulating air pump, and the end of the flow guide pipe is bent towards the fluorescent ring assembly.

According to the technical scheme, the reaction box, the bin, the fluorescent ring assembly, the converter and the controller are integrated into one detection device, so that the detection accuracy of the detection device on radioactive elements in silicon dioxide powder is improved, and the detection device is convenient to integrate into a chip production line. In the technical scheme of the invention, as the silicon dioxide powder and the fluorescent ring component react in the reaction cavity, the reaction box reduces the influence of the external environment on the detection result, greatly reduces the additional interference error caused by background radiation, and further greatly improves the detection accuracy, so that the detection device can accurately perform low equivalent detection on the radioactive elements in the silicon dioxide powder; on the other hand, the detection device can detect a large amount of silicon dioxide powder at one time, is convenient to integrate into a production line, and solves the problem that the existing detection device cannot be integrated into a production line. The device for detecting the trace radioactive elements in the silicon dioxide powder has the advantages of simple structure, low cost, convenience in operation, capability of detecting the trace radioactive elements in real time, high detection accuracy, capability of detecting the low equivalent radioactive elements and capability of being integrated into a production line.

Drawings

In order to more clearly illustrate the embodiments or technical solutions of the present invention, the drawings used in the embodiments or technical solutions of the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.

FIG. 1 is a schematic structural diagram of a device for detecting trace amounts of radioactive elements in a silica powder according to the present invention;

fig. 2 is a decay schematic diagram of the first 2 steps and the last 12 steps of the half-life chain of uranium.

The reference numbers indicate:

reference numerals	Name(s)	Reference numerals	Name(s)
				10	Reaction box	10a	Reaction chamber
20	Stock bin	30	Fluorescent ring assembly
				31	First fluorescent ring	33	Second fluorescent ring
35	Third fluorescent ring	40	Converter with a voltage detection circuit
				41	Probe head	43	Conversion unit
50	Flow guide assembly	51	Ingress pipe
				53	Return pipe	55	Air pump
551	Pump body	553	Air valve
				60	Light valve	70	Audio relay
80	Controller	90	Amplifying filter

The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that, if directional indications (such as up, down, left, right, front, back, 8230; etc.) are involved in the embodiment of the present invention, the directional indications are only used for explaining the relative positional relationship between the components, the motion situation, etc. in a specific posture (as shown in the figure), and if the specific posture is changed, the directional indications are correspondingly changed.

In addition, if there is a description of "first", "second", etc. in an embodiment of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the feature. In addition, if appearing throughout the text, "and/or" is meant to include three juxtaposed aspects, taking "A and/or B" as an example, including either the A aspect, or the B aspect, or both A and B satisfied aspects. In addition, technical solutions between the embodiments may be combined with each other, but must be based on the realization of the technical solutions by a person skilled in the art, and when the technical solutions are contradictory to each other or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention. The use of "including," "comprising," "containing," "having," or other variations thereof herein, is meant to encompass non-exclusive inclusions, as well as non-exclusive distinctions between such terms. The term "comprising" means that other steps and ingredients can be added that do not affect the end result. The term "comprising" also includes the terms "consisting essentially of and" consisting essentially of 82303030A ". 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 of the additional or optional ingredients, components, steps, or limitations described herein.

The invention provides a detection device for trace radioactive elements in silicon dioxide powder.

Referring to fig. 1, in the embodiment of the present invention, the detecting apparatus includes a reaction chamber 10, a bin 20, a flow guide assembly 50, a fluorescence ring assembly 30, a converter 40, and a controller 80; a reaction cavity 10a is formed inside the reaction box 10, a discharge hole is formed on the bin 20, the flow guide assembly 50 comprises an inlet pipe 51, the tail end of the inlet pipe 51 is bent towards the direction of the fluorescent ring assembly 30, and the inlet pipe 51 communicates the reaction cavity 10a with the bin 20 and is used for introducing the silicon dioxide powder in the bin 20 into the reaction cavity 10 a; the fluorescent ring assembly 30 is arranged in the reaction chamber 10a and is used for reacting with radioactive elements in the silicon dioxide powder and generating optical signals; the converter 40 is disposed in the reaction chamber 10a and is abutted against the fluorescent ring assembly 30, and the converter 40 is used for collecting the optical signal and converting the optical signal into an electrical signal; the controller 80 is connected to the converter 40, and is configured to output a detection result of the radioactive element in the silica powder according to the electrical signal.

More specifically, the controller 80 is a computer, and is disposed outside the reaction box 10, the storage bin 20, the diversion assembly 50, the fluorescence ring assembly 30, and the converter 40 are all sealed in the reaction box 10, and the reaction box 10 is a light-tight, nuclear radiation-proof and heat-dissipating box to avoid the influence of the external environment on the reaction process of the radioactive elements in the silica powder to be detected and the fluorescence ring assembly 30, thereby improving the detection sensitivity. In an embodiment, the material of the reaction chamber 10 is lead, the reaction chamber 10 includes a lower chamber body and an upper cover plate, the lower chamber body is in a half-football shape, the upper cover plate is in a flat-top half-round shape matching with the lower chamber body, the upper cover plate covers the lower chamber body to achieve the purpose of sealing and radiation protection, the converter 40 is disposed in the middle of the reaction chamber 10a, the converter 40 includes a probe 41 and a conversion unit 43 which are connected, the probe 41 is in an oblique-mouth cylindrical structure and is vertically disposed in the reaction chamber 10a, the fluorescence ring assembly 30 is sleeved on the periphery of the probe 41, the probe 41 is used for collecting optical signals generated by the fluorescence ring assembly 30, and the conversion unit 43 is used for converting the optical signals collected by the probe 41 into electrical signals; the cavity wall of the reaction cavity 10a is completely plated with silver, the reaction light generated by the outer ring curved surface of the fluorescence ring assembly 30 is emitted outwards, reaches the cavity wall of the reaction cavity 10a, is finally focused back to the fluorescence ring assembly 30 after being reflected once or more times, the reaction light generated by the inner ring curved surface of the fluorescence ring assembly 30 is directly focused into the probe 41 positioned at the center of the fluorescence ring assembly 30 once, and the fluorescence ring assembly 30 serving as a focusing lens is responsible for focusing the light to the conversion unit 43 through the probe 41 twice.

The diversion assembly 50 further comprises a first delivery pipe, a second delivery pipe and a return pipe 53, wherein one end of each of the first delivery pipe and the second delivery pipe is arranged in the reaction cavity 10a, the other end of each of the first delivery pipe and the second delivery pipe extends out of the reaction box 10, when the content of radioactive elements in the silicon dioxide powder is detected to be not over standard, the qualified silicon dioxide powder in the reaction cavity 10a is guided to a first material carrying box through the first delivery pipe, and then the first material carrying box carries the qualified silicon dioxide powder to flow into the next station in the production line for processing; when the content of radioactive elements in the silicon dioxide powder is detected to exceed the standard, guiding the unqualified silicon dioxide powder in the reaction cavity 10a to a second material loading box through the second delivery pipe, and then enabling the unqualified silicon dioxide powder loaded in the second material loading box to flow to the previous station in the production line for reworking treatment so as to remove the radioactive elements; one end of the return pipe 53 extends into the reaction chamber 10a, the other end of the return pipe is communicated with the bin 20, and when the silica powder in the reaction kettle needs to be detected for multiple times, the silica powder in the reaction chamber 10a returns to the bin 20 to wait for re-detection.

Before the radiation detection of the silica powder, a reference sample with standard radiation equivalent is needed to calibrate the final equivalent reading of the system under the conditions of standard temperature, standard flow rate and standard optical band. In the process of carrying out radiation detection on the silicon dioxide powder, the reaction temperature of the silicon dioxide powder and the fluorescent ring component 30 can be controlled to obtain electric signal oscillograms at different temperatures, the detection is carried out for multiple times at the same temperature, the corresponding oscillograms are analyzed to obtain detection results, and the detection accuracy and precision can be further improved by carrying out comprehensive analysis and data fusion on the multiple detection results.

The reaction temperature of the silica powder to be measured and the fluorescence ring assembly 30 can be controlled by providing a constant temperature environment, for example: the detection device is placed in a constant temperature environment, and the temperature requirement can be met after the overall temperature is stable. The skilled person can set the specific reaction temperature according to the detection requirement to meet the requirements of different detection processes, and is not limited herein.

According to the technical scheme of the invention, the reaction box 10, the bin 20, the fluorescent ring assembly 30, the converter 40 and the controller 80 are integrated into one detection device, so that the detection accuracy of the detection device on radioactive elements in silicon dioxide powder is improved, and the detection device is convenient to integrate into a chip production line. In the technical scheme of the invention, as the silicon dioxide powder and the fluorescent ring assembly 30 react in the reaction cavity 10a, the reaction box 10 reduces the influence of the external environment on the detection result, greatly reduces the additional interference error caused by background radiation, further greatly improves the detection accuracy, and enables the detection device of the invention to accurately perform low equivalent detection on radioactive elements in the silicon dioxide powder; on the other hand, the detection device can detect a large amount of silicon dioxide powder at one time, is convenient to integrate into a production line, and solves the problem that the existing detection device cannot be integrated into a production line. The device for detecting the trace radioactive elements in the silicon dioxide powder has the advantages of simple structure, low cost, convenience in operation, capability of detecting the trace radioactive elements in real time, high detection accuracy, capability of detecting the low equivalent radioactive elements and capability of being integrated into a production line.

Further, the diversion assembly 50 further includes an air pump 55, the air pump 55 is communicated with the lead-in pipe 51 and the return pipe 53, the air pump 55 is used for adjusting the speed of the silica powder in the storage bin 20 leading into the reaction chamber 10a, and is used for adjusting the speed of the silica powder in the reaction chamber 10a returning into the storage bin 20. Under the action of the air pump 55, the inlet pipe 51 is capable of guiding the silica powder in the silo 20 to the reaction chamber 10a under high pressure. In an embodiment, the air pump 55 is a circulating air pump 55, and the air pump 55 introduces tornado-shaped high-speed circulating gas into the introducing pipe 51, so as to create more one-to-one contact opportunities for the silica powder to be detected and the fluorescence ring assembly 30, enhance the intensity of the optical signal generated by the reaction of the silica powder to be detected and the fluorescence ring assembly 30, further enable more optical signals to be collected by the converter 40, and enable the detection result to be more accurate.

The air pump 55 includes a pump body 551 and an air valve 553 connected to each other, the pump body 551 is communicated with the introducing pipe 51, and the air valve 553 is used for controlling the air pressure of the pump body 551, and further controlling the speed of introducing the silica powder into the reaction chamber 10a through the introducing pipe 51. Under the condition that the speed of introducing the silicon dioxide powder into the reaction cavity 10a is controllable, the silicon dioxide powder to be detected can be introduced into the reaction cavity 10a in batches to react with the fluorescent ring assembly 30, so that a plurality of groups of detection results can be generated, the detection results can be comprehensively analyzed, and the accuracy of the detection results can be improved.

Further, the fluorescence ring assembly 30 can react with alpha particles, beta particles, and gamma particles and generate corresponding optical signals.

Referring to fig. 2, since the natural abundance of U element is as high as 99%, U element belongs to trace radioactive element, and U element mainly releases three kinds of radioactive elements of α, β, and γ in the decay process; therefore, in the chip manufacturing process, as for how to detect whether the radioactive elements in the raw material silicon dioxide powder exceed the standard on the production line, only the alpha heavy particle rays, the beta light particle rays and the gamma light wave rays in the silicon dioxide powder exceed the standard are required to be detected. Therefore, in order to further improve the detection accuracy and reduce the device cost, the detection device for trace radioactive elements in the silica powder of the present invention only needs to detect whether the contents of α particles, β particles, and γ particles in the silica powder exceed the standard, that is, the fluorescence ring assembly 30 of the present invention is made of a material that can react with the α particles, β particles, and γ particles and generate optical signals.

Specifically, the fluorescence ring assembly 30 is composed of a scintillator. The principle of the reaction of the scintillator with the radioactive element is as follows: energy levels in isolated atoms in the scintillator are mutually staggered and overlapped to form crystal energy bands, the energy bands can be divided into a valence band and a conduction band, a forbidden band with a certain width exists between the valence band and the conduction band, when ionizing radiation enters the crystal, electrons originally in the valence band are excited and jump to the conduction band, and then the electrons are excited back to the valence band after a period of time (with a typical value of about 0.1 microsecond), photons can be released in the process, and the photon energy is equal to the energy difference of the energy bands before and after the electrons; in general, the forbidden band is wide, so the energy of the photons released by transition is high and exceeds the range of visible light to enter ultraviolet light; if impurities (activators) such as Tl are incorporated into the scintillator crystal, some local energy levels may be generated in the original forbidden band, so that electrons may fall to these local energy levels when excited and de-excited again, and the corresponding energy difference is smaller than the original, so that the energy of the de-excited photons is lower than the original energy, i.e. falls within the visible range.

Scintillators can be solid, liquid or gas, and can be classified into inorganic scintillators and organic scintillators according to chemical properties. The solid inorganic scintillator generally refers to an inorganic salt crystal containing a small amount of activator mixture, and the luminous efficiency can be obviously improved after the pure inorganic salt crystal is added with the activator; the most commonly used inorganic crystal is a thallium-activated sodium iodide crystal, i.e., sodium iodide (thallium), the maximum achievable diameter is more than 500 mm, and the inorganic crystal has high luminous efficiency and gamma ray detection efficiency; other inorganic crystals also comprise cesium iodide (thallium), lithium iodide (europium), zinc sulfide (silver) and the like, which have characteristics, and newly appeared bismuth germanate semiconductors and the like; inorganic scintillators, both gaseous and liquid, are commonly made from inert gases and their liquefied states, such as xenon, krypton, argon, neon, helium, and the like. Most of the organic scintillators belong to aromatic hydrocarbon compounds with benzene ring structures and can be divided into organic crystal scintillators, liquid scintillators and plastic scintillators; the organic crystal mainly comprises anthracene, stilbene, naphthalene and the like, has higher fluorescence efficiency, but is not easy to be made into a large volume; the liquid scintillator and the plastic scintillator are both composed of a solvent, a solute and a wavelength conversion agent, and the difference is that the solvent of the plastic scintillator is solid at normal temperature; the radioactive sample to be tested can also be dissolved in the liquid scintillator, and the window-free scintillator can effectively react with the rays with very low energy; the liquid scintillator and the plastic scintillator can be easily manufactured into various shapes and sizes; the plastic scintillator can also be made into an optical fiber ring, so that the plastic scintillator can be conveniently coupled with the photoelectric device in a focusing way under various geometric conditions. One skilled in the art can select different types of scintillators to form the fluorescence ring assembly 30 according to different detection requirements.

In one embodiment, the fluorescence ring assembly 30 comprises a first fluorescence ring 31, a second fluorescence ring 33, and a third fluorescence ring 35, the first fluorescence ring 31, the second fluorescence ring 33, and the third fluorescence ring 35 all interface with the probe 41 and are used to react with alpha particles, beta particles, and gamma particles, respectively. The first fluorescent ring 31, the second fluorescent ring 33 and the third fluorescent ring 35 are all in the shape of transparent crystals, are usually made of crystal phosphor, transparent anthracene plastic or plastic-sealed organic liquid, and emit fluorescence when receiving ionizing radiation. In an exemplary 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 germanide.

In an embodiment, the probe 41 is a fiber optic probe, the conversion unit 43 is a photomultiplier or an avalanche diode, the first fluorescence ring 31, the second fluorescence ring 33 and the third fluorescence ring 35 are sleeved on the periphery of the probe 41, the probe 41 is configured to collect optical signals generated by the first fluorescence ring 31 and/or the second fluorescence ring 33 and/or the third fluorescence ring 35, and the conversion unit 43 is configured to convert the optical signals collected by the probe 41 into electrical signals and amplify the electrical signals.

In addition to the above embodiments, in one embodiment, the first fluorescent ring 31, the second fluorescent ring 33 and the third fluorescent ring 35 are all slidably sleeved on the 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 introducing pipe 51 are all adjustable. In the technical solution of the present invention, a change in the introduction speed of the silica powder into the reaction chamber 10a affects the movement trajectory of the silica powder after being introduced from the introduction pipe 51, and further affects 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 optical signal generated by the first fluorescent ring 31, the second fluorescent ring 33, and the third fluorescent ring 35; the first fluorescent ring 31, the second fluorescent ring 33 and the third fluorescent ring 35 are adjusted to appropriate heights in a sliding manner, so that 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 increased as much as possible, and the detection accuracy can be improved.

In the above embodiment, the converter 40 may simultaneously collect the light signals generated by the first fluorescent ring 31, the second fluorescent ring 33 and the third fluorescent ring 35, and may selectively collect the light signals generated by one or both of the first fluorescent ring 31, the second fluorescent ring 33 and the third fluorescent ring 35. In general, the silica powder does not release α rays, β rays, and γ rays at the same time, or even releases one of the three rays individually in many cases, and based on this, in the detection apparatus of the present invention, the converter 40 may selectively collect the optical signals generated by the first fluorescence ring 31, the second fluorescence ring 33, or the third fluorescence ring 35, so as to improve the sensitivity of the converter 40 to each wavelength band, and further improve the visualization of the detection result output by the controller 80, thereby avoiding the result that the amplitude of the waveform diagram is too small or large to be identified due to the wavelength band sensitivity.

In an embodiment, the detection apparatus further includes a light valve 60 connected to the converter 40, and the opening and closing of the light valve 60 at each wavelength band can be controlled to enable the photoelectric sensor to selectively collect and convert the optical signals generated by the first fluorescent ring 31, the second fluorescent ring 33 and/or the third fluorescent ring 35 into corresponding electrical signals, so as to further improve the sensitivity of the converter 40, and thus improve the detection accuracy of the detection apparatus.

In an embodiment, the detection apparatus further includes an audio relay 70 connected to the controller 80, the controller 80 may 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 wavelength band under the second instruction, so that the detection process is automated, the detection can be performed smoothly without manual intervention, and the manual consumption of nuclear protection is reduced.

In more detail, the audio relay 70 is connected to the controller 80 through a first hi-fi audio line, and the controller 80 transmits the first control command and the second control command to the audio relay 70 through the first hi-fi audio line; the controller 80 is connected to the transducer 40 via a second hi-fi audio line; first high-fidelity audio line with the periphery of second high-fidelity audio line all twines the cladding and has shielding sticky tape to avoid the signal to be disturbed in transmission process, be favorable to making the testing result more accurate.

In an embodiment, the detection apparatus further includes an amplifying filter 90 connected to the audio relay 70, and adapted to be in response matching with three types of radiation (α -ray, β -ray, γ -ray) spectrums, where the amplifying filter 90 includes an amplifying unit and a filtering unit, an input end of the amplifying unit is connected to an output end of the converter 40 through the audio relay 70, an output end of the amplifying unit is connected to an input end of the filtering unit, an output end of the filtering unit is connected to the controller 80 through the audio relay 70, the amplifying unit is configured to amplify intensities of the electrical signals output by the converter 40, the filtering unit is configured to perform independent filtering processing on the electrical signals output by the amplifying unit and superimpose the filtered electrical signals in respective wavebands, and then transmit the superimposed electrical signals to the controller 80 in a high-fidelity wiring manner with the audio relay 70, the controller 80 outputs a detection equivalent result of radioactive elements in the measured silica powder according to the electrical signals output by the filter, and the controller 80 is responsible for implementing digital filtering and intelligent error statistics, so as to improve intelligent noise-removal visualization of the detection result output by the controller 80. Because the amplifier amplifies the effective voltage of the electric signal and simultaneously amplifies the noise signal, the filter is used for filtering, the signal-to-noise ratio is improved, the influence of interference noise is avoided, and the precision and the accuracy of the detection device are further improved.

The foregoing examples are merely illustrative and serve to explain some of the features of the method of the present invention. The appended claims are intended to claim as broad a scope as is contemplated, and the examples presented herein are merely illustrative of selected implementations in accordance with all possible combinations of examples. Accordingly, it is applicants' intention that the appended claims are not to be limited by the choice of examples illustrating features of the invention. Where the claims recite a range of values, such ranges are intended to include all sub-ranges subsumed therein, and variations within the ranges are intended to be encompassed by the claims as appended hereto where possible.

Claims

1. A detection device for trace radioactive elements in silicon dioxide powder is characterized by comprising:

the reaction box is internally provided with a reaction cavity;

the fluorescent ring assembly is arranged in the reaction cavity and is used for reacting with the radioactive elements in the silicon dioxide powder and generating optical signals;

2. The apparatus for detecting trace radioactive elements in silica powder according to claim 1, further comprising a diversion assembly, wherein the diversion assembly further comprises an inlet tube and an air pump, the inlet tube is communicated with the reaction chamber and the silo, and is used for introducing the silica powder in the silo into the reaction chamber, and the air pump is used for adjusting the speed of introducing the silica powder in the silo into the reaction chamber.

3. The apparatus for detecting micro-radioactive elements in silica powder according to claim 2, wherein the fluorescent ring assembly comprises a first fluorescent ring, a second fluorescent ring and a third fluorescent ring, and the first fluorescent ring, the second fluorescent ring and the third fluorescent ring are respectively butted with the converter and are used for reacting with alpha particles, beta particles and gamma particles.

4. The apparatus for detecting trace radioactive elements in silica powder according to claim 3, 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 germanide.

5. The apparatus for detecting trace radioactive elements in silica powder according to claim 3, further comprising a light valve connected to the converter, wherein the converter can selectively collect and convert the optical signals generated by the first fluorescent ring and/or the second fluorescent ring and/or the third fluorescent ring into corresponding electrical signals by controlling the opening and closing of the light valve at each wavelength band.

6. The device for detecting the trace radioactive elements in the silica powder according to claim 5, wherein the converter comprises a probe and a conversion unit, the probe is connected with the probe, the probe is used for collecting optical signals generated by the first fluorescent ring, the second fluorescent ring and the third fluorescent ring, the conversion unit is used for converting the optical signals collected by the probe into electric signals, the first fluorescent ring, the second fluorescent ring and the third fluorescent ring are slidably sleeved on the periphery of the probe, and the distances between the first fluorescent ring, the second fluorescent ring and the third fluorescent ring and the tail end of the introduction pipe are adjustable.

7. The apparatus for detecting trace radioactive elements in silica powder according to claim 3, further comprising an audio relay connected to the controller, wherein the controller is capable of outputting a first instruction and/or a second instruction to the audio relay, the audio relay adjusts the air pressure of the air pump according to the first instruction, and the audio relay adjusts the opening and closing of the light valve according to the second instruction.

8. The device for detecting trace radioactive elements in silica powder according to claim 1, further comprising an amplifying filter connected to the audio relay, wherein the amplifying filter includes an amplifying unit and a filtering unit, an output end of the amplifying unit is connected to an input end of the filtering unit, an input end of the amplifying unit is connected to an output end of the converter, an output end of the filtering unit is connected to the controller, the amplifying unit is configured to amplify the electrical signals output by the converter, and the filtering unit is configured to perform independent filtering processing on the electrical signals output by the amplifying unit and superimpose and transmit the filtered electrical signals of respective wavelength bands to the controller.

9. The device for detecting the trace radioactive elements in the silica powder according to any one of claims 2 to 8, wherein the flow guide assembly further comprises a return pipe, one end of the return pipe extends into the reaction chamber, the other end of the return pipe is communicated with the air pump, and the silica powder in the reaction chamber can flow back into the storage bin through the return pipe.

10. The apparatus for detecting trace radioactive elements in silica powder according to any one of claims 2 to 8, wherein the air pump is a circulating air pump, and the end of the flow guide tube is bent toward the fluorescent ring assembly.