CN117130032A - Method, device and storage medium for orienting omnidirectional radioactive source - Google Patents
Method, device and storage medium for orienting omnidirectional radioactive source Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 49
- 230000002285 radioactive effect Effects 0.000 title claims abstract description 36
- 230000005855 radiation Effects 0.000 claims abstract description 210
- 238000001514 detection method Methods 0.000 claims abstract description 35
- 238000013507 mapping Methods 0.000 claims description 29
- 238000012545 processing Methods 0.000 claims description 25
- 239000000463 material Substances 0.000 claims description 13
- 230000005251 gamma ray Effects 0.000 claims description 3
- 238000013461 design Methods 0.000 abstract description 10
- 238000004422 calculation algorithm Methods 0.000 description 9
- 238000010586 diagram Methods 0.000 description 7
- 230000004044 response Effects 0.000 description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 3
- 239000000956 alloy Substances 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000004590 computer program Methods 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 230000006870 function Effects 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 2
- 229910052721 tungsten Inorganic materials 0.000 description 2
- 239000010937 tungsten Substances 0.000 description 2
- 238000013316 zoning Methods 0.000 description 2
- 238000007476 Maximum Likelihood Methods 0.000 description 1
- 238000000342 Monte Carlo simulation Methods 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000013528 artificial neural network Methods 0.000 description 1
- XQPRBTXUXXVTKB-UHFFFAOYSA-M caesium iodide Chemical compound [I-].[Cs+] XQPRBTXUXXVTKB-UHFFFAOYSA-M 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000013135 deep learning Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
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- 229910052742 iron Inorganic materials 0.000 description 1
- 239000011133 lead Substances 0.000 description 1
- 238000007726 management method Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 239000012857 radioactive material Substances 0.000 description 1
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- 239000004065 semiconductor Substances 0.000 description 1
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- 230000008685 targeting Effects 0.000 description 1
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- G01T—MEASUREMENT OF NUCLEAR OR X-RADIATION
- G01T1/00—Measuring X-radiation, gamma radiation, corpuscular radiation, or cosmic radiation
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Abstract
The invention provides an omnidirectional radioactive source orientation method, an omnidirectional radioactive source orientation device and a storage medium, and relates to the field of radiation detection. The method comprises the following steps: the counting rate generated by each ray detector when detecting the radioactive source is obtained through a specific shielding structure and detector structure design so as to obtain N counting rates; determining a first count rate, a second count rate and a third count rate of the N count rates; determining an angle area where the radiation source is located according to the detection direction of the radiation detector corresponding to the first counting rate and the detection direction of the radiation detector corresponding to the second counting rate; determining a target angle according to the first counting rate, the second counting rate and the third counting rate; the target angle includes: an angle between a direction of the radiation source relative to the radiation source directing device and a reference direction in the angular region; the direction of the radiation source relative to the radiation source directing device is determined based on the angular region and the target angle. The method can improve the directional energy range of the radioactive source direction finder and the directional accuracy.
Description
Technical Field
The present invention relates to the field of radiation detection, and in particular, to a method and apparatus for orienting an omnidirectional radiation source, and a storage medium.
Background
In the field of production safety, safety management of radiation sources is a very important topic. The orientation and searching of radioactive materials and radioactive contaminations such as radioisotopes is of considerable importance from the point of view of radiation protection and safety. Therefore, how to perform reliable radiation monitoring on nuclear power plants and radiation facilities, and to find out lost radioactive substances such as radioactive isotopes and radioactive pollutants, has been a serious problem.
Conventional radiation field detection techniques include various types of stationary portal monitors and portable radiation detection devices. They are able to determine the presence of a radiation source in the vicinity of the detection unit, but these devices generally do not have radiation source orientation capability. In addition, the existing radioactive source orientation technology has the problems of narrow orientation energy range and low orientation precision.
Disclosure of Invention
In view of the above, the present invention aims to provide an omnidirectional radiation source orientation method and apparatus, which can improve the orientation energy range of a radiation source orientation instrument and the orientation accuracy.
In order to achieve the above object, the technical scheme adopted by the embodiment of the invention is as follows:
in a first aspect, the present invention provides an omnidirectional radiation source orientation method, applied to a radiation source orientation device, where the radiation source orientation device includes a radiation shielding module and N radiation detectors; the ray shielding module comprises an N-shaped cross section, and each ray detector is embedded and arranged on the ray shielding module based on one side of the N-shaped cross section, wherein N is more than or equal to 3; the omnidirectional radioactive source orientation method comprises the following steps: acquiring the counting rate generated by each radiation detector when detecting the radiation source so as to obtain N counting rates; determining a first count rate, a second count rate and a third count rate of the N count rates; the first counting rate is the largest counting rate in N counting rates, the second counting rate is the second counting rate from big to small in N counting rates, and the third counting rate is the third counting rate from big to small in N counting rates; determining an angle area where the radiation source is located according to the detection direction of the radiation detector corresponding to the first counting rate and the detection direction of the radiation detector corresponding to the second counting rate; determining a target angle according to the first counting rate, the second counting rate and the third counting rate; wherein the target angle comprises: an angle between a direction of the radiation source relative to the radiation source directing device and a reference direction in the angular region; and determining a direction of the radiation source relative to the radiation source directing device based on the angular region and the target angle.
In an alternative embodiment, the step of determining the target angle from the first count rate, the second count rate, and the third count rate comprises: determining an angle mapping value according to the first counting rate, the second counting rate and the third counting rate; wherein the angle map value represents an angle between a direction of the radiation source relative to the radiation source directing device and a reference direction in the angular region, or alternatively, the angle map value corresponds to the target angle (i.e., an angle between the direction of the radiation source relative to the radiation source directing device and the reference direction in the angular region); determining a target angle according to a preset mapping relation and an angle mapping value; the preset mapping relation comprises a one-to-one correspondence relation between a plurality of preset angle values and a plurality of preset angle mapping values.
In an alternative embodiment, the angle map value is calculated according to the following formula:
where K represents an angle map value, X1 represents a first count rate, X2 represents a second count rate, and X3 represents a third count rate.
In an alternative embodiment, the method further comprises: detecting M calibration sources sequentially by using N ray detectors; the method comprises the steps that M calibration sources are located in preset angle areas, an included angle between the direction of each calibration source relative to a radioactive source orientation device and a reference direction in the preset angle areas is a preset angle value, preset angle values corresponding to different calibration sources are different, and the preset angle areas are angle areas determined by the detection direction of an ith ray detector and the detection direction of an (i+1) th ray detector in N ray detectors; acquiring a counting rate generated by each ray detector when any one of the M calibration sources is detected, so as to obtain M groups of data; wherein each set of data includes N calibrated count rates; determining M angle mapping values according to the M groups of data; and determining a preset mapping relation according to the M angle mapping values and M preset angle values corresponding to the M calibration sources.
In an alternative embodiment, the N radiation detectors include 4 radiation detectors, the shape of the radiation shielding module includes a cuboid, and the N-sided cross-section includes a square cross-section; each ray detector is inlaid and arranged on the ray shielding module based on the center point of one side of the square section.
In an alternative embodiment, the radiation shielding module includes a gamma-ray shielding material.
In an alternative embodiment, the radiation detector comprises a gamma detector.
In an alternative embodiment, the radiation source directing apparatus further comprises a data reading processing module, the data reading processing module being connected to each of the N radiation detectors.
In a second aspect, the present invention provides a radiation source directing apparatus comprising: the device comprises a ray shielding module, N ray detectors and a data reading and processing module; the ray shielding module comprises an N-shaped cross section, and each ray detector is embedded and arranged in the ray shielding module based on one side of the N-shaped cross section, wherein N is more than or equal to 3; the data reading processing module is configured to control the N radiation detectors to perform the method according to any one of the embodiments of the first aspect.
In a third aspect, the invention provides a computer readable storage medium comprising instructions which, when run on a data reading processing module in a radiation source directing apparatus, cause the radiation source directing apparatus to perform the method of any one of the embodiments of the first aspect.
It should be appreciated that in the method embodiments described in the first aspect, a structural design for embedding N radiation detectors in a radiation shielding module and a radiation source orientation algorithm suitable for the structural design are included. Specifically, for the structural design, firstly, the counting rate generated by each radiation detector when detecting the radiation source is collected to obtain N counting rates; then determining a first counting rate, a second counting rate and a third counting rate in the N counting rates; and sequentially determining an angle region and a target angle in which the radioactive source is positioned according to the first count rate, the second count rate and the third count rate, so as to determine the direction of the radioactive source relative to the radioactive source orientation device. In this radiation source orientation algorithm implementation, it is capable of orienting a radiation source over a large energy range (relevant experimental data can be seen as described below) and can provide greater orientation accuracy. Therefore, the invention can improve the orientation energy range of the radioactive source orientation instrument and the orientation precision. It should be added that the embodiment of the invention not only can orient the radiation source with larger energy, but also can orient the complex radiation source, namely, the method can accurately calculate the direction of the radiation source emitting gamma rays with various different energies. This is because the present invention provides a directional algorithm that is suitable for a wider energy range, and the structural design of the proposed shielding module can further increase the upper limit of this energy range (see related embodiments in the present invention for related verification examples).
In order to make the above objects, features and advantages of the present invention more comprehensible, embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments of the present invention will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and should not be considered as limiting the scope, and other related drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic view of a radiation source directing apparatus according to an embodiment of the present invention;
FIG. 2 is a schematic flow chart of an omnidirectional radiation source orientation method according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a response curve for detecting the radiation source directing apparatus of FIG. 1 at different angles according to an embodiment of the present invention;
FIG. 4 is a schematic view of an embodiment of the present invention for angular zoning the source orientation apparatus of FIG. 1;
FIG. 5 is another schematic view of an embodiment of the present invention for angular zoning the source orientation apparatus of FIG. 1;
fig. 6 is a schematic diagram of a change curve of a preset mapping relationship under different energy ray conditions according to an embodiment of the present invention;
FIG. 7 is a functional block diagram of a radiation source directing program module according to an embodiment of the present invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.
It should be noted that the features of the embodiments of the present invention may be combined with each other without conflict.
The embodiment of the invention provides a technical scheme, which comprises an omnidirectional radioactive source orientation method, an omnidirectional radioactive source orientation device and a storage medium, and relates to the field of radiation detection. The technical scheme provided by the invention will be described below with reference to the accompanying drawings.
First, a radiation source directing apparatus provided by an embodiment of the present invention is described, which may include: the system comprises a ray shielding module, N ray detectors and a data reading processing module.
The ray shielding module comprises an N-shaped cross section, and each ray detector is embedded and arranged on the ray shielding module based on one side of the N-shaped cross section. The cross-section may be a cross-section of the radiation shielding module.
In an alternative embodiment, each radiation detector is mounted to the radiation shielding module based on a midpoint of one of the sides of the N-sided polygonal cross-section.
In an alternative embodiment, N is 3. That is, the radiation shielding module may include a 3-sided, 4-sided, 5-sided, …. The number of N radiation detectors may be 3,4,5, …. This is not limited thereto.
The radiation source directing apparatus provided by the present invention is illustrated below in fig. 1 with n=4. It should be noted that n=4 is only an example, and N of the radiation source directing device in the present embodiment is not limited to 4, and the number of N may be changed according to actual needs based on the present invention to achieve the object of the present invention. Thus, all other embodiments (e.g., radiation source directing devices in the n=3, 4,5, …, etc. settings) that would be within the purview of one of ordinary skill in the art without the inventive effort based on the embodiments of the present invention are within the scope of the invention.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a radiation source orientation device according to an embodiment of the present invention (the design of fig. 1 may also be referred to as a four-scintillator structure design). The radiation source directing apparatus 100 includes: the radiation shielding module 110, 4 radiation detectors (including radiation detectors 121, 122, 123, 124), and a data reading processing module (not shown). Each ray detector is represented by one dark portion in fig. 1, and the ray shielding module 110 is represented by a white portion of a rectangular parallelepiped in fig. 1.
The radiation shielding module 110 includes a 4-sided polygon cross section, and each radiation detector is inlaid in the radiation shielding module 110 based on one side of the 4-sided polygon cross section. The data reading processing module is electrically connected with the 4 ray detectors. The data reading processing module is used for controlling the 4 ray detectors to realize the omnidirectional radiation source orientation method described below.
In one embodiment, the shape of the radiation shielding module 110 includes a cuboid. The 4-sided cross-section includes a square cross-section. In other words, the radiation shielding module 110 has a rectangular parallelepiped shape with a square cross section. As shown in fig. 1, each radiation detector may be mounted to the radiation shielding module 110 based on a center point of one side of the square cross section 130. In yet another embodiment, each of the radiation detectors may be mosaic disposed on one of the 4 sides of the radiation shielding module 110, and each of the radiation detectors is disposed along a center point of the side.
Specifically, the shape of the radiation source-directing device 100 described above can be obtained by arranging 4 radiation detectors in a cross shape on 4 sides of a rectangular parallelepiped having a square horizontal section, and then filling the remaining area of the rectangular parallelepiped with a shielding material.
In one embodiment, the material of the radiation shielding module 110 includes gamma-ray shielding material. In particular, high density, high atomic number materials may be used to effectively shield gamma rays. Common materials include lead, tungsten, concrete, and the like. These materials have a higher atomic density and a higher absorption capacity, and can effectively reduce the penetration of gamma rays. In one embodiment, the material of the radiation shielding module 110 may satisfy the following characteristics: 1. average relative atomic mass above 50;2. density of more than 5g/cm 3 The method comprises the steps of carrying out a first treatment on the surface of the 3. Low radioactivity.
Alternatively, the material of the radiation shielding module 110 may include at least one of lead, tungsten, and iron, and may be any material having a relatively high density. Optionally, the material of the radiation shielding module 110 includes a pure metal or alloy having a higher average atomic number, for example, a pure metal or alloy having an average atomic number greater than or equal to 25. Preferably, the material of the radiation shielding module 110 is set as iron powder. In one embodiment, the radiation detectors (including radiation detectors 121, 122, 123, 124) described above may include gamma detectors. More specifically, the above-described radiation detector is not limited to a scintillator, and may be any gamma detector such as a semiconductor, a gas detector, or the like. In this embodiment, the radiation detectors 121, 122, 123, 124 may be cesium iodide scintillators in the shape of 10×10×30 mm cuboids.
In one embodiment, the data reading processing module described above may include sipms (or photomultipliers) and data processing circuitry. Sipms (or photomultiplier tubes) may be coupled to each of the radiation detectors. The data processing circuit may acquire and process the count rate data for each radiation detector via SiPM (or photomultiplier tube) to implement the omnidirectional radiation source orientation method hereinafter.
On the basis of the radiation source orientation device, the embodiment of the invention also provides an omnibearing radiation source orientation method which can be applied to the omnibearing radiation source orientation device. The omnidirectional radioactive source orientation method can be executed by a data processing circuit in the data reading and processing module to realize radioactive source orientation, so that the orientation energy range of the radioactive source orientation instrument is improved, and the orientation precision is improved. Specifically, the structural design of the radiation source orientation device provided by the embodiment of the invention can improve the orientation energy range. The following method (radioactive source orientation algorithm) provided by the embodiment of the invention can achieve the purpose of unifying orientation algorithms with different energies, so that the response difference of gamma rays with different energies does not need to be considered, and better orientation precision is obtained.
Referring to fig. 2, fig. 2 is a flow chart of an omnidirectional radiation source orientation method according to an embodiment of the invention. The method may include the following steps S110-S150, respectively, described below.
S110, acquiring the counting rate generated by each radiation detector when detecting the radiation source so as to obtain N counting rates.
S120, determining a first counting rate, a second counting rate and a third counting rate in the N counting rates.
The first counting rate is the largest counting rate in N counting rates, the second counting rate is the second counting rate which is arranged in the order from the big to the small in the N counting rates, and the third counting rate is the third counting rate which is arranged in the order from the big to the small in the N counting rates. In other words, the second count rate is the second largest count rate of the N count rates, and the third count rate is the third largest count rate of the N count rates.
S130, determining an angle area where the radiation source is located according to the detection direction of the radiation detector corresponding to the first counting rate and the detection direction of the radiation detector corresponding to the second counting rate.
In one embodiment, the detection direction of the radiation detector may be a direction in which the radiation detector is facing, for example, the detection direction of the radiation detector may be a direction of radiation emitted perpendicularly from the center of the detection window of the radiation detector.
Alternatively, if the detection direction of the radiation detector corresponding to the first count rate is denoted as direction 1, and the detection direction of the radiation detector corresponding to the second count rate is denoted as direction 2, the angle region may be an included angle region between the directions 1 and 2.
In one embodiment, if the detection direction of the radiation detector corresponding to the first count rate is denoted as direction 1, the detection direction of the radiation detector corresponding to the second count rate is denoted as direction 2, and the direction bisecting the direction 1 and the direction 2 is denoted as the intermediate direction. Then in S130 the angular region may be further determined as the angular region between direction 1 and the middle direction.
And S140, determining the target angle according to the first counting rate, the second counting rate and the third counting rate.
Wherein the target angle comprises: the angle between the direction of the radiation source relative to the radiation source directing apparatus and the reference direction in the angular region. Alternatively, the reference direction in the angle area may be a detection direction of the radiation detector corresponding to the first count rate, or a detection direction of the radiation detector corresponding to the second count rate, which is not limited. The direction of the radiation source with respect to the radiation source orientation device is understood to be the direction of the radiation emitted from the radiation shielding module to the radiation source position.
Specifically, in S140, determining the target angle according to the first count rate, the second count rate, and the third count rate may include the following steps 1.1-1.2:
and 1.1, determining an angle mapping value according to the first counting rate, the second counting rate and the third counting rate.
Wherein the angle map value represents an angle between a direction of the radiation source relative to the radiation source directing device and a reference direction in the angular region. Alternatively, the angle map value corresponds to the target angle, i.e., the angle between the direction of the radiation source relative to the radiation source directing device and a reference direction in the angular region.
And 1.2, determining a target angle according to a preset mapping relation and an angle mapping value.
The preset mapping relation comprises a one-to-one correspondence relation between a plurality of preset angle values and a plurality of preset angle mapping values.
In one embodiment, the angle map value may be calculated according to the following formula:
where K represents an angle map value, X1 represents a first count rate, X2 represents a second count rate, and X3 represents a third count rate.
And S150, determining the direction of the radioactive source relative to the radioactive source orientation device according to the angle area and the target angle.
It will be appreciated that the angular region describes a range of directions of the radiation source and that the target angle describes a specific case of directions of the radiation source in the angular region. Thus, the direction of the radiation source relative to the radiation source directing device can be described using the angular region and the target angle.
In the steps S110 to S150, N count rates are obtained by collecting count rates generated by each radiation detector when detecting the radiation source; then determining a first counting rate, a second counting rate and a third counting rate in the N counting rates; and sequentially determining an angle region and a target angle in which the radioactive source is positioned according to the first count rate, the second count rate and the third count rate, so as to determine the direction of the radioactive source relative to the radioactive source orientation device. In this radiation source orientation algorithm implementation, it is able to orient complex radiation sources over a large energy range (relevant experimental data can be seen in the relevant description in the example of a four scintillator construction design below) and can provide higher orientation accuracy. Therefore, the invention can improve the energy range of accurate orientation of the radioactive source orientation instrument and the orientation precision.
In one embodiment, the method embodiment may further include the following steps 2.1-2.4 to determine the preset mapping relationship described above:
and 2.1, detecting M calibration sources sequentially by using N ray detectors.
Wherein, M calibration sources are all located in a preset angle area. The included angle between the direction of each calibration source relative to the radioactive source orienting device and the reference direction in the preset angle area is a preset angle value. The preset angle values corresponding to different calibration sources are different. And the preset angle area is an angle area determined by the detection direction of the ith radiation detector and the detection direction of the (i+1) th radiation detector in the N radiation detectors.
And 2.2, acquiring the counting rate generated by each ray detector when any one of the M calibration sources is detected, so as to obtain M groups of data.
Wherein each set of data includes N nominal count rates.
And 2.3, determining M angle mapping values according to the M groups of data.
Specifically, N calibration count rates for the j-th set of data in the M sets of data may be used to determine 1 corresponding angle mapping value. The determination of the angle map value is the same as the principle of step 1.1, and reference is made to step 1.1.
And 2.4, determining a preset mapping relation according to the M angle mapping values and M preset angle values corresponding to the M calibration sources.
Based on the radiation source orientation device 100 shown in fig. 1, the present invention further measures the total detection efficiency of each radiation detector under different angles, and referring specifically to fig. 3, fig. 3 shows a schematic response curve diagram of the radiation source orientation device 100 shown in fig. 1 under different angles.
The method embodiment illustrated in FIG. 2 described above is further explained below in connection with the previous example of a four scintillator construction design in FIG. 1. Wherein 4 ray detectors (including ray detectors 121, 122, 123, 124) are numbered A, B, C, D in sequence, as shown in FIG. 4, the direction corresponding to the A-ray detector can be marked as the starting point 0, and then the directions are marked in sequence in the anticlockwise direction，/>，…，/>：
1, firstly, obtaining the counting rate generated by each radiation detector when detecting the radioactive source so as to obtain 4 counting rates.
2, sorting the 4 count rates from large to small to obtain a first count rate, a second count rate and a third count rate in the 4 count rates.
And 3, calculating an angle mapping value K according to the first counting rate, the second counting rate and the third counting rate and the following formula:
where K represents an angle map value, X1 represents a first count rate, X2 represents a second count rate, and X3 represents a third count rate. In this embodiment, K is in the range of [0,1].
It will be appreciated that the curve of the value of K as a function of the angle of incidence of the radiation source is a periodic function curve based on the structural characteristics of the radiation source directing apparatus 100, the response curve shown with reference to fig. 3, and the calculated values. The period of the curve is pi/2. From the MCNP5 Monte Carlo simulation and calculation, it can be derived that at the angle of incidence θ εK (θ) monotonically increases over the range of incidence angles; at an incident angle θ∈ ∈ ->K (θ) monotonically decreases over the range of incidence angles.
The direction range (azimuth angle) of the radiation source directing apparatus 100 can be divided into 8-angle regions according to the characteristics of K (θ) so that the radiation source direction can be judged by K (θ). Specifically, due to the periodicity of the K (θ) curve and the monotonic nature within the period, the K (θ) curve can be divided into 4 monotonically increasing regions and 4 monotonically decreasing regions within 2β. For example, referring to FIG. 4, 0 can be combined withThe included angle region between is marked as angle region 1, will +.>And->The included angle region between these is denoted as angle region 2, …, will +.>The area of the angle with 0 is denoted as the angle area 8.
And 4, determining which one of the 8 angle areas the radiation source is in according to the detection direction of the radiation detector corresponding to the X1 and the detection direction of the radiation detector corresponding to the X2. For example, referring to fig. 4, assuming that the radiation detector corresponding to X1 is an a-ray detector and the radiation detector corresponding to X2 is a B-ray detector, it is possible to determine that the radiation source is in the angle region 1. For another example, if the radiation detector corresponding to X1 is a B-ray detector and the radiation detector corresponding to X2 is an a-ray detector, then it may be determined that the radiation source is in the angle region 2.
And 5, after the angle area where the radioactive source is positioned is determined, determining the specific direction of the position where the radioactive source is positioned according to a K (theta) curve.
Additionally, in an alternative example, as shown in FIG. 5, the range of directions of the radiation source directing apparatus 100 may be divided into 4 equiangular regions according to the detection direction of A, B, C, D. In this example, the angular range of the radiation source may be determined according to the detection direction of the radiation detector corresponding to X1, and then the degree of deviation of the specific direction in which the radiation source is located with respect to the detection direction of the radiation detector corresponding to X1 may be determined according to a K (θ) curve. Specifically, assuming that the X1-corresponding radiation detector is an a-radiation detector and the X2-corresponding radiation detector is a B-radiation detector, then（/>The target angle may be represented); assuming that the X1-corresponding radiation detector is an a-radiation detector and the X2-corresponding radiation detector is a D-radiation detector, then。
In one embodiment, other algorithms may be used to achieve radiation source targeting, such as algorithms like the maximum likelihood algorithm MLEM or artificial neural network deep learning.
Referring to fig. 6, fig. 6 is a schematic diagram illustrating a change curve of a preset mapping relationship under different energy ray conditions according to an embodiment of the present invention. In fig. 6, the K (θ) curves described above are demonstrated to have good agreement at 1332keV and 59keV photon energies, respectively, by MCNP simulation. That is, the radiation source orientation device provided by the invention can maintain excellent orientation performance and precision in a wide energy range, and has low cost. That is, the radiation source directing apparatus provided by the embodiments of the present invention is an omnidirectional radiation source directing device (or system) with high sensitivity and a wide energy range.
In order to perform the corresponding steps in the foregoing embodiments and the various possible manners, an implementation of a radiation source directing program module is provided below, and referring to fig. 7, fig. 7 is a functional block diagram of a radiation source directing program module 300 according to an embodiment of the present invention. The radiation source directing program module 300 can be used to implement the method described above with respect to fig. 2. It should be noted that, the basic principle and the technical effects of the radiation source directing program module 300 provided in this embodiment are the same as those of the foregoing embodiments, and for brevity, reference should be made to the corresponding contents of the foregoing embodiments. The radiation source directing program module 300 may include: a transceiver unit 310 and a processing unit 320.
Alternatively, the transceiver unit 310 and the processing unit 320 may be stored in a memory in the form of software or Firmware (Firmware) or be solidified in an Operating System (OS) of a data reading processing module of the radiation source directing apparatus 100 shown in fig. 1 and may be executed by the data reading processing module. Meanwhile, data, codes of programs, and the like, which are required to execute the above units, may be stored in the memory.
It will be appreciated that the transceiver unit 310 and the processing unit 320 may be configured to support the data reading processing module to perform the steps associated with the method embodiments described above, and/or other processes for the techniques described herein, such as the method embodiment shown in fig. 2 and the respective method embodiments described above, which are not limited thereto.
Based on the above method embodiments, the present invention also provides a computer readable storage medium having a computer program stored thereon, which when executed by a processor performs the above method embodiments. In particular, the storage medium may be a general-purpose storage medium, such as a removable disk, a hard disk, or the like, on which a computer program is executed, capable of executing the method in the above-described embodiment.
The above description is only an example of the present invention and is not intended to limit the scope of the present invention, and various modifications and variations will be apparent to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The omnibearing radioactive source orientation method is characterized by being applied to a radioactive source orientation device, wherein the radioactive source orientation device comprises a radiation shielding module and N radiation detectors; the ray shielding module comprises an N-shaped cross section, and each ray detector is embedded and arranged in the ray shielding module based on one side of the N-shaped cross section, wherein N is more than or equal to 3;
wherein, the omnidirectional radiation source orientation method comprises the following steps:
acquiring counting rates generated by each radiation detector when detecting a radiation source so as to obtain N counting rates;
determining a first count rate, a second count rate and a third count rate of the N count rates; the first counting rate is the largest counting rate of the N counting rates, the second counting rate is the second counting rate of the N counting rates from big to small, and the third counting rate is the third counting rate of the N counting rates from big to small;
determining an angle area where the radioactive source is located according to the detection direction of the ray detector corresponding to the first counting rate and the detection direction of the ray detector corresponding to the second counting rate;
determining a target angle according to the first count rate, the second count rate and the third count rate; wherein the target angle includes: an angle between a direction of the radiation source relative to the radiation source directing device and a reference direction in the angular region; the method comprises the steps of,
a direction of the radiation source relative to the radiation source directing device is determined based on the angular region and the target angle.
2. The method of claim 1, wherein the step of determining a target angle from the first count rate, the second count rate, and the third count rate comprises:
determining an angle mapping value according to the first count rate, the second count rate and the third count rate; wherein the angle map value represents an angle between a direction of the radiation source relative to the radiation source directing device and a reference direction in the angle region;
determining the target angle according to a preset mapping relation and the angle mapping value; the preset mapping relation comprises a one-to-one correspondence relation between a plurality of preset angle values and a plurality of preset angle mapping values.
3. The method of claim 2, wherein the angle map value is calculated according to the formula:
wherein K represents the angle map value, X1 represents the first count rate, X2 represents the second count rate, and X3 represents the third count rate.
4. The method of claim 2, further comprising:
detecting M calibration sources sequentially by using the N ray detectors; the M calibration sources are all located in preset angle areas, the included angle between the direction of each calibration source relative to the radiation source orientation device and the reference direction in the preset angle areas is a preset angle value, the preset angle values corresponding to different calibration sources are different, and the preset angle areas are angle areas determined by the detection direction of the ith radiation detector and the detection direction of the (i+1) th radiation detector in the N radiation detectors;
acquiring a counting rate generated by each radiation detector when any one of the M calibration sources is detected, so as to obtain M groups of data; wherein each set of data comprises N calibrated count rates;
determining M angle mapping values according to the M groups of data;
and determining the preset mapping relation according to the M angle mapping values and M preset angle values corresponding to the M calibration sources.
5. The method of claim 1, wherein the N radiation detectors comprise 4 radiation detectors, the shape of the radiation shielding module comprises a cuboid, and the N-sided cross-section comprises a square cross-section; each ray detector is inlaid and arranged on the ray shielding module based on the center point of one side of the square section.
6. The method of claim 1, wherein the radiation shielding module comprises a gamma-ray shielding material.
7. The method of claim 1, wherein the radiation detector comprises a gamma detector.
8. The method of claim 1, wherein the source directing device further comprises a data reading processing module, the data reading processing module being coupled to each of the N radiation detectors.
9. A radiation source directing apparatus, comprising: the device comprises a ray shielding module, N ray detectors and a data reading and processing module; the ray shielding module comprises an N-shaped cross section, and each ray detector is embedded and arranged in the ray shielding module based on one side of the N-shaped cross section, wherein N is more than or equal to 3;
the data reading processing module is configured to control the N radiation detectors to perform the omnidirectional radiation source orientation method of any one of claims 1 to 8.
10. A computer readable storage medium comprising instructions that, when executed on a data reading processing module in a radiation source directing apparatus, cause the radiation source directing apparatus to perform the omnidirectional radiation source directing method of any one of claims 1 to 8.
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