CN109738936B - Substance detection method, device and system - Google Patents
Substance detection method, device and system Download PDFInfo
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
The embodiment of the invention discloses a substance detection method, a device and a system. The substance detection method comprises the following steps: collecting spectral data of nuclides of a detected object, wherein the spectral data comprises a spectral shape; determining a target detection region corresponding to the detected object in at least two target detection regions according to the spectrum data; and detecting the detected object according to the nuclide detection threshold value of the target detection area. According to the technical scheme provided by the embodiment of the invention, the target detection area corresponding to the detected object can be rapidly determined through the spectrum data of the nuclide of the detected object, and then the detected object is detected based on the nuclide detection threshold value of the target detection area, so that the radioactive substance can be accurately identified.
Description
Technical Field
The embodiment of the invention relates to the technical field of material detection, in particular to a material detection method, a device and a system.
Background
In daily life, when entering and exiting important places such as subway stations, airports, railway stations, customs and the like, articles are often required to be placed on an article machine for detecting radioactive substances so as to ensure the safety of people. In general, when an object passes through the object, the X-ray generator is turned on, and information of the object is obtained based on the detected change in the X-ray dose transmitted through the object to be detected, so as to confirm whether the object is a dangerous object, and when the object does not pass through the object, the X-ray generator is turned off. However, at the moment when the X-ray generating device is turned on and off, the radiation amount of the X-rays is suddenly changed, obvious steps exist, and the shape of the energy spectrum acquired by the multi-channel analyzer is randomly changed. Therefore, the detection device needs to effectively identify and alarm radioactive substances when the X-ray generation device is turned on and off and false alarm is easy to generate. Moreover, the X-rays belong to radioactive rays, the detection of gamma-ray sources can be influenced, and equipment software and hardware are required to consider the influence of the effective filtering X-rays so as to ensure that the detected objects are not influenced by the X-rays in the identification process.
In the prior art, a technology for detecting a radioactive source by utilizing the spectrum shape discrimination mode by utilizing the spectrum difference of the X-ray and the radioactive source is proposed. In theory, the real-time energy spectrum when the radioactive source is close is indeed different from the energy spectrum under the normal working state of the X-ray machine, and the coupling parts of the two energy spectrum can be filtered, so that the radiation influence of X-rays is eliminated, and the purpose of radioactive source detection is achieved.
This technique is theoretically possible, but in practice it has been found that: when the X-ray machine works statically, the spectrogram is unstable, the shape of the spectrogram is continuously changed, and no obvious rule exists; when the contrast elimination method is adopted, the energy spectrum coupling filtering effect is not ideal, the false alarm rate is high, and the radioactive source cannot be effectively detected.
Disclosure of Invention
The embodiment of the invention provides a substance detection method, a device and a system, which are used for accurately detecting radioactive substances.
In a first aspect, an embodiment of the present invention provides a method for detecting a substance, including:
collecting spectrum data of nuclides of detected objects;
determining a target detection region corresponding to the detected object in at least two target detection regions according to the spectrum data;
and detecting the detected object according to the nuclide detection threshold value of the target detection area.
Optionally, the substance detection method further comprises:
dividing the X-ray detection range from a low-energy detection region to a high-energy detection region or from the high-energy detection region to the low-energy detection region into at least two target detection regions, and respectively determining the nuclide detection threshold value of each target detection region.
Optionally, the substance detection method further comprises:
the radiation characteristics of the X-rays are determined based on the physical properties of the at least two radioactive materials, and the X-ray detection range is determined based on the X-ray radiation characteristics.
Optionally, the substance detection method further comprises:
and determining X-ray sensitive areas in the at least two target detection areas, and carrying out data weighting processing on the X-ray sensitive areas.
Optionally, the substance detection method further comprises:
and carrying out background sliding window filtering treatment on the radiation step signal generated by the X-ray generating device during starting and closing.
In a second aspect, embodiments of the present invention also provide a substance detection apparatus, the apparatus including:
the spectrum data acquisition module is used for acquiring spectrum data of nuclides of detected objects;
the detection area determining module is used for determining a target detection area corresponding to the detected object in at least two target detection areas according to the spectrum data;
and the detection module is used for detecting the detected object according to the nuclide detection threshold value of the target detection area.
In a third aspect, embodiments of the present invention also provide a substance detection system, the system comprising: the device comprises a bearing device of a detected object, an X-ray generating device and radiation monitoring equipment; the radiation monitoring device comprises a substance detection device, wherein the substance detection device is used for executing the substance detection method according to any one of the embodiments of the invention.
Optionally, the radiation monitoring device comprises at least one shielding region, wherein the shielding region is determined by a Monte Care calculation method.
Optionally, the shielding region is provided with a shield for shielding X-rays, wherein the shield comprises a lead plate.
Optionally, a lead plate is arranged between the bearing device of the detected object and the radiation monitoring device, a through hole is formed in the lead plate, and the diameter of the through hole is larger than or equal to that of the probe of the radiation monitoring device.
In a fourth aspect, an embodiment of the present invention further provides a terminal, including a memory, a processor, and a computer program stored in the memory and capable of running on the processor, where the processor implements the method for detecting a substance according to any one of the embodiments of the present invention when executing the program.
In a fifth aspect, embodiments of the present invention further provide a computer readable storage medium having stored thereon a computer program which, when executed by a processor, implements a substance detection method according to any of the embodiments of the present invention.
According to the technical scheme provided by the embodiment of the invention, the target detection area corresponding to the detected object can be rapidly determined through the spectrum data of the nuclide of the detected object, and then the detected object is detected based on the nuclide detection threshold value of the target detection area, so that the technical problem of high false alarm rate of the existing radioactive source detection method is solved, and radioactive substances can be accurately identified.
Drawings
In order to more clearly illustrate the technical solution of the exemplary embodiments of the present invention, a brief description is given below of the drawings required for describing the embodiments. It is obvious that the drawings presented are only drawings of some of the embodiments of the invention to be described, and not all the drawings, and that other drawings can be made according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart of a method for detecting a substance according to an embodiment of the present invention;
FIG. 2 is a block diagram of a material detecting apparatus according to a second embodiment of the present invention;
FIG. 3 is a block diagram of a material detection system according to a third embodiment of the present invention;
FIG. 3a is a diagram of the test result of a binary false alarm experiment when the X generating device is turned on according to the third embodiment of the present invention;
fig. 3b is a diagram of a test result of a binary false alarm experiment when the X generating device is turned off according to the third embodiment of the present invention;
fig. 3c is a diagram of test results of an experiment for testing a Co60 source under the start of an X generating device according to the third embodiment of the present invention;
fig. 4 is a hardware configuration diagram of a terminal according to a fourth embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the following detailed description of specific embodiments of the present invention is given with reference to the accompanying drawings. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting thereof.
It should be further noted that, for convenience of description, only some, but not all of the matters related to the present invention are shown in the accompanying drawings. Before discussing exemplary embodiments in more detail, it should be mentioned that some exemplary embodiments are described as processes or methods depicted as flowcharts. Although a flowchart depicts operations (or steps) as a sequential process, many of the operations can be performed in parallel, concurrently, or at the same time. Furthermore, the order of the operations may be rearranged. The process may be terminated when its operations are completed, but may have additional steps not included in the figures. The processes may correspond to methods, functions, procedures, subroutines, and the like.
Before describing the embodiments of the present invention, an application scenario of the embodiments of the present invention is described, and because the X-ray has a very high penetrating power, many substances opaque to visible light, such as ink paper, timber, etc., can be penetrated, so that many solid materials generate visible fluorescence, and for a radiation monitoring device working in a security inspection environment, an object to be detected is usually detected by the X-ray. (incorrect speaking, delete)
Because the total counting rate of equipment detection shows step change at the moment of opening or closing the X-ray, the common radiation monitoring equipment only depends on the counting rate to simply judge whether the radiation level is abnormal, under the condition that the counting rate is suddenly changed but not necessarily radiation passes, the traditional algorithm system is not suitable, false alarm often occurs, if the counting rate alarm threshold is simply increased, the sensitivity of a part of equipment is weakened, the generation of false alarm at the moment of opening or closing the X-ray can be effectively reduced, but the caused result is that the detection sensitivity of other nuclides is greatly reduced, and therefore, the influence range of the X-ray or the control of the X-ray radiation range is often required to be extremely accurate. Moreover, it is necessary to increase the sensitivity of the detection of the X-ray region.
Example 1
Fig. 1 is a flowchart of a method for detecting a substance according to an embodiment of the present invention, where the method may be performed by a substance detection device, and the device may be implemented by software and/or hardware.
As shown in fig. 1, the method of this embodiment may specifically include:
s110, collecting the spectrum data of the nuclide of the detected object.
In the embodiment of the present invention, the object to be detected may be a substance having radioactivity or a substance having no radioactivity.
The detection of the radioactive substance can be realized by identifying the radioactive nuclide, and the identification of the radioactive nuclide can be specifically realized by acquiring the gamma energy spectrum of the radioactive nuclide and analyzing the gamma energy spectrum so as to determine the information such as the type and the content of the constituent elements of the radioactive substance. Accordingly, the spectral data of the nuclide of the object to be detected can be acquired, and the radioactive substance of the object to be detected can be detected from the spectral data of the object to be detected. Wherein the spectral data may include at least one of spectral shape, spectral characteristic peak, frequency, amplitude, and the like.
S120, determining a target detection area corresponding to the detected object in at least two target detection areas according to the spectrum data.
Currently, when an object to be detected is detected by taking an X-ray detection range as a detection area, the type of the nuclide needs to be judged one by one from the lowest-energy detection area, and the identification process is slow. In the embodiment of the invention, the X-ray detection range can be divided into at least two target detection areas, and the detected object can be identified in a partitioning way. Specifically, the X-ray detection range may be divided into at least two target detection areas from the low-energy detection area to the high-energy detection area, or the X-ray detection range may be divided into at least two target detection areas from the high-energy detection area to the low-energy detection area, and further, the nuclide detection threshold value for determining each target detection area may be respectively determined.
Research is conducted on the characteristic of X-rays, and the radiation energy area range is concentrated in a low-energy area compared with a cobalt source and a cesium source. The method is characterized in that the X-ray detection range is divided into six target detection areas from a low-energy detection area to a high-energy detection area according to spectrum data, the threshold value of the nuclide to be identified of each target detection area is different, and after the spectrum data of the nuclide is acquired, the target detection area of the detected object can be quickly positioned and identified according to the spectrum shape, namely the identification area of the detected object is quickly positioned.
As an alternative to the embodiment of the present invention, the radiation characteristics of the X-rays may be determined according to the physical characteristics of at least two radioactive materials, and the X-ray detection range may be determined according to the radiation characteristics of the X-rays. In the embodiment of the invention, the physical characteristics of different radioactive substances, such as wavelength, energy spectrum, penetrating power and the like, are combined, and the X-ray radiation characteristics are obviously separated from the radiation characteristics of other radioactive substances through a large amount of experimental data accumulation, so that the control of the influence range of the X-rays is very accurate.
On the basis, the technical scheme of the embodiment of the invention can further comprise: and determining X-ray sensitive areas in the at least two target detection areas, and carrying out data weighting processing on the X-ray sensitive areas so as to increase detection inertia of the X-ray sensitive areas. For example, the X-ray sensitive areas of the at least two target detection areas may be determined by joint debugging experiments with the device. A filtering process may be further performed for the X-ray sensitive area.
Optionally, the energy range of the X-rays is related to 241 Am performs intelligent judgment to meet the following requirements 241 Am can be identified by intelligent judgment of Am 241 Am. So that the device can effectively filter the influence of X-rays on the device and can not influence the detection of other radioactive substances.
S130, detecting the detected object according to the nuclide detection threshold value of the target detection area.
After the target detection area of the detected object is determined, the detected object is detected according to the nuclide detection threshold value of the target detection area, and a detection result can be more accurately and rapidly given.
It can be understood that in the security inspection environment, the object to be inspected is often inspected to detect whether the object is a radioactive substance, so as to take corresponding measures to avoid the influence of the radioactive substance on people and objects in the environment, and ensure the environmental safety. Wherein the detection of the detected object includes detection of a gamma radiation source. Taking a gamma radioactive source as an example, when radiation of the gamma radioactive source is generated, a nuclide detection threshold of the target detection area can be automatically started to detect the detected object, the gamma radioactive source is automatically distinguished according to the shape and the radiation level of the real-time spectrum of the nuclide of the detected object, and the radiation level data is given. The method and the device can quickly identify the specific nuclides in the region according to the interval of the measurement spectrum by the partition intelligent identification algorithm preset in the embodiment of the invention, and quickly give out the identification conclusion.
In addition, on the basis of the technical scheme of the embodiment of the invention, the substance detection method can further comprise the following steps: and carrying out background sliding window filtering treatment on the radiation step signal generated by the X-ray generating device during starting and closing. According to the technical scheme, background sliding window filtering processing is carried out on the radiation quantity step generated by starting and stopping the X-ray generating device, inertia to X-ray detection is increased, false alarm can not be generated no matter the X-ray generating device is started or not started during equipment working, and the area outside the X-ray detection range is not affected.
After the equipment is powered on, the spectrum data of the environmental background is automatically acquired, and the equipment is dynamically updated all the time in normal operation so as to distinguish X-rays or gamma sources in time. When the radiation of the X-ray is generated, the influence of the X-ray is automatically removed through a zoned intelligent recognition algorithm, and the environmental background spectrum data is updated in time.
Wherein, the spectrum data of the environmental background is automatically judged and automatically identified by the equipment according to the past test data. When the equipment is powered on and started for the first time, the equipment needs to be executed in a surrounding clean passive environment, at the moment, the spectrum data generated by the equipment can be automatically recorded as background spectrum data of a default environment, and then in the normal operation of the equipment, the background spectrum data can be automatically updated.
According to the technical scheme, the target detection area corresponding to the detected object can be rapidly determined through the spectrum data of the nuclide of the detected object, and then the detected object is detected based on the nuclide detection threshold value of the target detection area, so that the technical problem of high false alarm rate of an existing radioactive source detection method is solved, and radioactive substances can be accurately identified.
Example two
Fig. 2 is a schematic structural diagram of a substance detecting apparatus according to a second embodiment of the present invention, as shown in fig. 2, the substance detecting apparatus includes: a spectral data acquisition module 210, a detection region determination module 220, and a detection module 230.
Wherein, the spectrum data acquisition module 210 is configured to acquire spectrum data of nuclides of the detected object; a detection region determining module 220, configured to determine a target detection region corresponding to the detected object from at least two target detection regions according to the spectrum data; the detection module 230 is configured to detect the detected object according to a nuclide detection threshold of the target detection area.
According to the technical scheme, the target detection area corresponding to the detected object can be rapidly determined through the spectrum data of the nuclide of the detected object, and then the detected object is detected based on the nuclide detection threshold value of the target detection area, so that the technical problem of high false alarm rate of an existing radioactive source detection method is solved, and radioactive substances can be accurately identified.
On the basis of the above technical solutions, the substance detection device may further include:
the detection area determining module is used for dividing the X-ray detection range from a low-energy detection area to a high-energy detection area or from the high-energy detection area to the low-energy detection area into at least two target detection areas and respectively determining the nuclide detection threshold value of each target detection area.
On the basis of the above technical solutions, the substance detection device may further include:
and the detection range determining module is used for determining the radiation characteristics of the X rays according to the physical characteristics of at least two radioactive substances and determining the detection range of the X rays according to the X-ray radiation characteristics.
On the basis of the above technical solutions, the substance detection device may further include:
and the region weighting module is used for determining the X-ray sensitive regions in the at least two target detection regions and carrying out data weighting processing on the X-ray sensitive regions.
On the basis of the above technical solutions, the substance detection device may further include:
and the signal processing module is used for carrying out background sliding window filtering processing on the radiation step signal generated by the X-ray generating device during starting and closing.
The substance detection device can execute the substance detection method provided by any embodiment of the invention, and has the corresponding functional modules and beneficial effects of executing the substance detection method.
Example III
Fig. 3 is a schematic structural diagram of a substance detection system according to a third embodiment of the present invention, where the substance detection system includes: the device comprises a bearing device of a detected object, an X-ray generating device and radiation monitoring equipment; wherein the radiation monitoring apparatus comprises a substance detection device for performing the substance detection method according to any of the embodiments of the present invention. The relevant explanation of the substance detection method can be referred to the method embodiments of the present invention, and will not be repeated here.
As shown in fig. 3, the carrying device of the detected object may be a conveying device including a conveyor belt and the conveyor belt driving device; the X-ray generating device may be an X-ray machine.
When the material detection system works, a large amount of X rays are generated through the X-ray generation device, the radiation monitoring equipment is embedded in the material detection system and is always exposed to a strong X-ray irradiation environment, if shielding measures are not added, the radiation dosage of the equipment can be very large, the detection of the radiation monitoring equipment is interfered, the flooding of small signals and weak signals is easily caused, and the detection sensitivity of the equipment is reduced. Thus, the radiation monitoring device may comprise at least one shielding region, wherein the shielding region is determined by a Monte Care calculation method.
On the aspect of eliminating the influence of X rays, the effective shielding area and area of the material detection system can be calculated by using Monte Carlo calculation. Of course, an effective shielding area of the radiation monitoring device can also be calculated.
The Meng Ka calculation, i.e. the monte carlo calculation method, can obtain the occurrence frequency of an event by a random test method aiming at the probability of the event, and replace the probability with the frequency, so that the problem is solved. The detection efficiency, response function, full peak, and other related quantities of the detector can be calculated using the monte carlo principle.
The detection efficiency of the low-energy photons can be obtained by an experimental method; however, the detection efficiency of high-energy photons is difficult to obtain experimentally, and in practice such radionuclides are limited, especially the high-energy photon sources are more difficult to obtain. The influence of different shielding on the detection efficiency of X-rays and gamma radiation sources can thus be calculated theoretically by means of a Monte Carlo calculation method.
The experimental results may be calculated by exponential transformation using, for example, MCNP (Monte Carlo Neutron and Photon Transport Code, monte carlo neutron and optical transmission code) packages. The effective shielding area is calculated, and the shielding size and thickness of the shielding area of the radiation monitoring equipment are reasonably designed.
On the basis of this, the shielding region may be provided with a shield for shielding X-rays. Wherein the shield may not be made of heavy metals. Further, the heavy metal may be lead. Illustratively, the shield may include a lead plate and/or a lead curtain, or the like.
It is understood that the at least one shielding region includes one, two or more shielding regions. The shields of the different shielding areas may be the same or different.
Taking the radiation monitoring equipment as an example, lead coating treatment can be carried out on the end faces of the radiation monitoring equipment, which are irrelevant to the radiation detection function, up and down, left and right, front and back.
The article monitoring system can also cover the lead plate on the whole body outside the whole machine in order to meet the radiation protection requirement.
In order to avoid the interference of the X-ray generating device on the radiation monitoring equipment and ensure that the radiation detecting equipment detects the radiation level of the detected object carried by the detected object carrying device, optionally, a lead plate can be arranged between the detected object carrying device and the radiation monitoring equipment, the lead plate is provided with a through hole, and the diameter of the through hole is greater than or equal to the diameter of a probe of the radiation monitoring equipment.
It will be appreciated that the smaller aperture size provides good control over X-ray leakage in the material detection system. The diameter of the through hole in the embodiment of the invention can be set according to the diameter of the probe, for example, the opening size of the through hole is a round hole with the diameter of the probe. Optionally, the diameter of the through hole is equal to the diameter of the probe. Considering that the precision of the actual perforating process may cause the dimension of the aperture of the through hole to be inaccurate, the difference between the diameter of the through hole and the diameter of the probe is within a preset error range. The smaller the error range, the better, and the specific numerical value of the error range is not limited herein. For example, it may be.+ -. 1mm,.+ -. 1.5mm or.+ -. 2 mm. The structural design of the existing equipment is not specifically designed, and common equipment is simply used, so that the material detection system is often oversized in self-opening, and the risk of exceeding the standard of X-ray leakage of the material detection system is brought.
It should be noted that the size of the through hole may be set according to practical situations, including but not limited to the above technical solution, which is not limited herein specifically. The technical scheme of the embodiment of the invention can reduce the influence of radioactive rays to the minimum by adopting a strategy of reasonably shielding the whole machine and detecting small holes of the probe.
In order to ensure the detection accuracy of the radiation monitoring device, optionally, the through holes can be arranged corresponding to the X-ray sensitive area, so that the directional receiving and the dosage control of the X-rays are realized. Not only reducing the X-ray interference force, but also not reducing the sensitivity of the equipment.
In order to facilitate the user's view of the detected object, the substance detection system may further comprise an image acquisition device for acquiring image information of the detected object. Further, the substance detection system may further include a display device for displaying the image information.
In addition, the substance detection system may further include: and the alarm device is used for alarming when the detected object is detected to be radioactive. The alarm device can be realized in a software and/or hardware mode.
The material detection system provided by the embodiment of the invention respectively performs a binary false alarm experiment when the X-ray generation device is turned on and turned off and a radioactive source detection experiment when the X-ray generation device is turned on.
FIG. 3a is a diagram of the test result of a binary false alarm experiment when the X generating device is turned on according to the third embodiment of the present invention; fig. 3b is a diagram of a test result of a binary false alarm experiment when the X generating device is turned off according to the third embodiment of the present invention. As shown in fig. 3a and 3b, the substance detection system does not generate an alarm action in both normal operating states of the X-generator being turned on or off.
Fig. 3c is a graph of test results of an experiment for testing a Co60 source under the condition that the X generating device is turned on according to the third embodiment of the present invention. When the device is started to perform X-ray, a Co60 source is used for testing, the device can accurately identify and alarm, an alarm spectrogram can also completely present radiation spectrum distribution, the highest peak is X-ray, the two secondary peaks are Co60 characteristic spectrums, and the device can identify and alarm the radioactive source in a strong X-ray environment.
The material detection system provided by the embodiment of the invention can realize automatic update of environmental background data, and is not influenced by startup and shutdown of the X-ray generation device. The equipment is stable in operation, and the false alarm rate is not more than 0.1%. Has realized a radiation source 60 Co、 137 Cs、 241 Am, and alarming, and the success probability of monitoring is up to more than 99.99%.
Example IV
Fig. 4 is a schematic hardware structure diagram of a terminal according to a fourth embodiment of the present invention, and as shown in fig. 4, the terminal includes: one or more processors 410, one processor 410 being illustrated in fig. 4; a memory 420; the terminal may further include: an input device 430 and an output device 440. The processor 410, memory 420, input means 430 and output means 440 in the apparatus may be connected by a bus or otherwise, in fig. 4 by way of example by a bus 450.
The memory 420 is a non-transitory computer readable storage medium, and may be used to store software programs, computer executable programs, and modules, such as program instructions/modules (e.g., the spectral data acquisition module 210, the detection region determination module 220, and the detection module 230 shown in fig. 2) corresponding to a substance detection method according to an embodiment of the present invention. The processor 410 executes various functional applications of the device and data processing, namely, implements a substance detection method of the above-described method embodiments by running software programs, instructions and modules stored in the memory 420.
Memory 420 may include a storage program area that may store an operating system, at least one application program required for functionality, and a storage data area; the storage data area may store data created according to the use of the device, etc. In addition, memory 420 may include high-speed random access memory, and may also include non-transitory memory, such as at least one magnetic disk storage device, flash memory device, or other non-transitory solid state storage device. In some embodiments, memory 420 may optionally include memory located remotely from processor 410, which may be connected to the terminal device via a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.
The input device 430 may be used to receive input numeric or character information and to generate key signal inputs related to user settings and function control of the terminal. The output 440 may include a display device such as a display screen.
Example five
A fifth embodiment of the present invention also provides a storage medium containing computer-executable instructions, which when executed by a computer processor, are for performing a substance detection method, the method comprising: collecting spectrum data of nuclides of detected objects; determining a target detection region corresponding to the detected object in at least two target detection regions according to the spectrum data; and detecting the detected object according to the nuclide detection threshold value of the target detection area.
Of course, the storage medium containing computer-executable instructions provided in the embodiments of the present invention is not limited to the method operations described above, and may also perform the related operations in the substance detection method provided in any embodiment of the present invention.
From the above description of embodiments, it will be clear to a person skilled in the art that the present invention may be implemented by means of software and necessary general purpose hardware, but of course also by means of hardware, although in many cases the former is a preferred embodiment. Based on such understanding, the technical solution of the present invention may be embodied essentially or in a part contributing to the prior art in the form of a software product, which may be stored in a computer readable storage medium, such as a floppy disk, a Read-Only Memory (ROM), a random access Memory (Random Access Memory, RAM), a FLASH Memory (FLASH), a hard disk or an optical disk of a computer, etc., and include several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the substance detection method according to the embodiments of the present invention.
It should be noted that, in the embodiment of the above-mentioned substance detecting apparatus, each unit and module included is only divided according to the functional logic, but is not limited to the above-mentioned division, as long as the corresponding functions can be realized; in addition, the specific names of the functional units are also only for distinguishing from each other, and are not used to limit the protection scope of the present invention.
The foregoing description is only of the preferred embodiments of the invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, while the invention has been described in connection with the above embodiments, the invention is not limited to the embodiments, but may be embodied in many other equivalent forms without departing from the spirit or scope of the invention, which is set forth in the following claims.
Claims (9)
1. A method for detecting a substance, comprising:
collecting spectrum data of nuclides of detected objects; wherein the spectral data comprises a spectral shape;
determining a target detection region corresponding to the detected object in at least two target detection regions according to the spectrum data;
detecting the detected object according to the nuclide detection threshold value of the target detection area;
wherein the method further comprises:
dividing an X-ray detection range from a low-energy detection region to a high-energy detection region or from the high-energy detection region to the low-energy detection region into at least two target detection regions, and respectively determining a nuclide detection threshold value of each target detection region;
wherein the nuclide detection thresholds of each target detection region are different; correspondingly, after the spectrum data of the nuclide is acquired, the target detection area is rapidly positioned and identified according to the spectrum shape.
2. The method as recited in claim 1, further comprising:
the radiation characteristics of the X-rays are determined based on the physical properties of the at least two radioactive materials, and the X-ray detection range is determined based on the X-ray radiation characteristics.
3. The method as recited in claim 1, further comprising:
and determining X-ray sensitive areas in the at least two target detection areas, and carrying out data weighting processing on the X-ray sensitive areas.
4. The method as recited in claim 1, further comprising:
and carrying out background sliding window filtering treatment on the radiation step signal generated by the X-ray generating device during starting and closing.
5. A substance detecting apparatus, comprising:
the spectrum data acquisition module is used for acquiring spectrum data of nuclides of detected objects; wherein the spectral data comprises a spectral shape;
the detection area determining module is used for determining a target detection area corresponding to the detected object in at least two target detection areas according to the spectrum data;
the detection area determining module is specifically used for dividing an X-ray detection range from a low-energy detection area to a high-energy detection area or from the high-energy detection area to the low-energy detection area into at least two target detection areas and respectively determining a nuclide detection threshold value of each target detection area;
the detection module is used for detecting the detected object according to the nuclide detection threshold value of the target detection area;
wherein the nuclide detection thresholds of each target detection region are different; correspondingly, after the spectrum data of the nuclide is acquired, the target detection area is rapidly positioned and identified according to the spectrum shape.
6. A substance detection system, comprising: the device comprises a bearing device of a detected object, an X-ray generating device and radiation monitoring equipment; wherein the radiation monitoring apparatus comprises a substance detection device for performing the method of detecting a substance according to any of claims 1-4.
7. The system of claim 6, wherein the radiation monitoring device comprises at least one shielded area, wherein the shielded area is determined by a monte carlo calculation method.
8. The system of claim 7, wherein the shielding area is provided with a shield for shielding X-rays, wherein the shield comprises a lead plate.
9. The system of claim 6, wherein a lead plate is disposed between the carrier of the detected object and the radiation monitoring device, the lead plate is provided with a through hole, and the diameter of the through hole is greater than or equal to the diameter of the probe of the radiation monitoring device.
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| CN110673191B (en) * | 2019-09-23 | 2021-04-23 | 北京永新医疗设备有限公司 | Channel type radioactive source positioning system and method |
| CN112099074B (en) * | 2020-09-16 | 2023-05-09 | 北京华力兴科技发展有限责任公司 | Temperature drift correction method and system |
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