CN118962767B - Rapid positioning method and device for 4 pi visual angle radioactive source and storage medium - Google Patents
Rapid positioning method and device for 4 pi visual angle radioactive source and storage medium Download PDFInfo
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Abstract
本发明提供一种4π视角放射源快速定位方法、装置及存储介质，涉及辐射检测领域。该方法包括：利用闪烁晶体作为辐射探测器，利用所述多个光传感器连续收集多组光电信号；其中，每组光电信号包括每个光传感器收到的一次信号强度值；根据所述多组光电信号确定放射源的核素类型；根据每组光电信号中的多个信号强度值以及所述多个光传感器的位置，确定每组光电信号对应的闪烁光的产生位置；根据所述多组光电信号对应的闪烁光的产生位置以及所述核素类型确定放射源相对于探测器的方向。还可以直接用多组光电信号以及多个光传感器的位置，确定放射源相对于的探测器的方向。该方法能够简单、快速、准确且4π视角下确定放射源位置。
The present invention provides a method, device and storage medium for rapid positioning of a radioactive source at a 4π viewing angle, and relates to the field of radiation detection. The method comprises: using a scintillation crystal as a radiation detector, and using the plurality of optical sensors to continuously collect a plurality of groups of photoelectric signals; wherein each group of photoelectric signals includes a signal strength value received by each optical sensor; determining the nuclide type of the radioactive source according to the plurality of groups of photoelectric signals; determining the generation position of the scintillation light corresponding to each group of photoelectric signals according to the plurality of signal strength values in each group of photoelectric signals and the positions of the plurality of optical sensors; determining the direction of the radioactive source relative to the detector according to the generation position of the scintillation light corresponding to the plurality of groups of photoelectric signals and the nuclide type. The direction of the radioactive source relative to the detector can also be determined directly using the plurality of groups of photoelectric signals and the positions of the plurality of optical sensors. The method can determine the position of the radioactive source simply, quickly and accurately at a 4π viewing angle.
Description
Technical Field
The invention relates to the field of radiation detection, in particular to a method and a device for rapidly positioning a 4 pi visual angle radioactive source and a storage medium.
Background
In the event of emergency situations in nuclear power plants and radiation facilities, accurate and reliable radiation monitoring is of paramount importance. Among them, how to find out the radioactive substances such as the lost radioisotope and the radioactive contaminant is a technical problem of great concern.
Currently, the radionuclide identification device is usually used for detecting the radioactive dose rate and radionuclide information to find the lost radioactive substance, but the lost radioactive substance can be found by manually searching the source, so that the efficiency is low, the accuracy is low, and the safety risk exists. In addition, coded aperture gamma cameras, while capable of detecting the distribution of radioactive material, have very limited detection viewing angles, typically only 40 °. Compton cameras, while capable of detecting the distribution of radioactive materials over a wide range of viewing angles, are expensive and not suitable for detection of gamma radiation sources having energies below 250 keV. Thus, there is an urgent need for an apparatus that can rapidly position radioactive materials at any viewing angle and that can produce good energy and positional resolution.
Disclosure of Invention
In view of the above, the present invention aims to provide a method, a device and a storage medium for rapidly positioning a radiation source with a 4 pi viewing angle, which can simply, rapidly, accurately and omnidirectionally determine the position of the radiation source.
In order to achieve the above object, the technical scheme adopted by the embodiment of the invention is as follows:
the invention provides a rapid positioning method of a 4 pi visual angle radioactive source, which is applied to a rapid positioning device of the 4 pi visual angle radioactive source, and comprises a three-dimensional scintillator and a plurality of photosensors, wherein the photosensors are arranged on the surface of the three-dimensional scintillator in a scattered manner, when rays of the radioactive source generate scintillation light in the three-dimensional scintillator, the photosensors are used for collecting photoelectric signals corresponding to the scintillation light, the rapid positioning method of the 4 pi visual angle radioactive source comprises the steps of continuously collecting a plurality of groups of photoelectric signals by the plurality of photosensors, wherein each group of photoelectric signals comprises a plurality of signal intensity values, one photosensor obtains one signal intensity value through light collection in one interaction, the nuclide type of the radioactive source is determined according to the plurality of groups of photoelectric signals, and the azimuth information of the radioactive source is determined according to the nuclide type and the plurality of groups of photoelectric signals.
The invention provides a rapid positioning device for a radiation source with a 4 pi visual angle, which comprises a three-dimensional scintillator, a plurality of light sensors and a data reading processing module, wherein the light sensors are arranged on the surface of the three-dimensional scintillator in a scattered mode, when rays of a radiation source generate scintillation light in the three-dimensional scintillator, the light sensors are used for collecting photoelectric signals corresponding to the scintillation light, and the data reading processing module is used for controlling the light sensors to realize the method according to any embodiment of the first aspect.
In a third aspect, the present invention provides a computer readable storage medium comprising instructions that, when run on a data reading processing module of a 4pi view radiation source fast positioning device, cause the 4pi view radiation source fast positioning device to implement the method of any one of the embodiments of the first aspect.
It should be appreciated that the present application utilizes the attenuation characteristics of gamma photons in a three-dimensional scintillator and the propagation characteristics of scintillation light within the three-dimensional scintillator to design a three-dimensional scintillator and a plurality of photosensor structures whose detection viewing angles of gamma radiation sources can cover the full 4 pi range. Specifically, in the embodiment of the method described in the first aspect, the plurality of photosensors are disposed on the surface of the three-dimensional scintillator in a scattered manner, so that the rapid positioning device for the radiation source with the 4 pi viewing angle senses the radiation generated by the radiation source in each direction, and interacts (i.e. scintillates light) with the radiation source with each other through the three-dimensional scintillator, and collects the information of the interaction through the sensors, and obtains the azimuth information of the radiation source after data analysis, so that the rapid positioning device for the radiation source with the 4 pi viewing angle provided by the application has the 4 pi viewing angle so as to maintain excellent positioning performance of the radiation source in any direction, and can simultaneously satisfy good energy resolution and position resolution in wide viewing angle radiation detection so as to rapidly and accurately determine the position of the radiation source or the radiation hot zone in a nuclear terrorist event, that is, and can simply, rapidly, accurately and omnidirectionally determine the position of the radiation source.
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 following description will briefly explain the drawings required to be used in the embodiments of the present invention, 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 diagram of a rapid positioning device for a radiation source with a 4 pi viewing angle according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a process for collecting scintillation light of a rapid positioning device for a radiation source with a 4 pi viewing angle according to an embodiment of the present invention;
FIG. 3 is a schematic flow chart of a method for rapidly positioning a radiation source with a 4 pi viewing angle according to an embodiment of the present invention;
Fig. 4 is a functional block diagram of a data reading processing module according to an embodiment of the present invention.
Reference numerals:
A rapid positioning device for a radioactive source with a 100-4 pi visual angle, a 110-spherical scintillator and a 120-photosensor.
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 refer to 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 a method and a device for rapidly positioning a4 pi visual angle radioactive source 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 rapid positioning device for a radiation source with a 4 pi visual angle provided by the embodiment of the invention is described, which comprises a three-dimensional scintillator with a specific structure and a plurality of photo sensors. Specifically, the rapid positioning device for the radiation source with the 4 pi visual angle can comprise a three-dimensional scintillator, a plurality of light sensors and a data reading and processing module. Wherein, a plurality of light sensors are dispersedly arranged on the surface of the three-dimensional scintillator. The plurality of light sensors may also be communicatively coupled to the data reading processing module.
Alternatively, the shape of the three-dimensional scintillator includes a sphere, a spheroid, or a column. Wherein, the spheroid comprises an ellipsoid, a spherical polyhedron or a Planet regular polyhedron, and the columnar body comprises a cylinder or a columnar polyhedron.
Wherein when the three-dimensional scintillator is in the shape of a sphere (or spheroid), the plurality of photosensors may be in close proximity to the surface of the sphere (i.e., the plurality of photosensors are in close proximity to each other with the edges of the sphere). When the three-dimensional scintillator is in the shape of a column (a cylinder is exemplified), a plurality of photosensors may be laid one round against the side surface of the cylinder.
In an alternative embodiment, the rapid positioning device for a 4 pi viewing angle radioactive source further comprises a light collecting material. The light collecting material is used to fill voids on the surface of the three-dimensional scintillator except for the plurality of photosensors. The light collecting material may be a material having a strong light collecting property, and the specific type of material is not limited.
In the above embodiment, the photosensor may be a device capable of converting a single photon signal into an optical electrical signal, such as SiPM, MPPC, or the like, and in this embodiment, siPM, and the photosensor may fill the surface of the three-dimensional scintillator as much as possible.
The three-dimensional scintillator may be a module that converts gamma rays into a plurality of scintillation photons, which in this embodiment may be a CsI crystal.
The following fig. 1 illustrates a rapid positioning device for a radiation source with a 4 pi viewing angle provided by the present invention by taking a three-dimensional scintillator shape as a sphere example. It should be noted that the shape of the three-dimensional scintillator is a sphere, which is only an example, and does not mean that the shape of the three-dimensional scintillator in the present embodiment is limited to a sphere, and the shape of the three-dimensional scintillator may be changed according to actual needs on the basis of the present invention to achieve the object of the present invention. Thus, all other embodiments (e.g., a 4 pi view angle rapid positioning device in which the three-dimensional scintillator is shaped as a sphere, spheroid, or cylinder, etc.) that would be obtained by one of ordinary skill in the art without making any inventive effort based on the embodiments of the present invention are within the scope of the present invention.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a rapid positioning device for a radiation source with a4 pi viewing angle according to an embodiment of the present invention. The rapid 4 pi view radiation source positioning device 100 includes a spherical scintillator 110, a plurality of photosensors 120, and a data reading processing module (not shown). Each light sensor 120 is represented by one dark color patch in fig. 1.
Referring to fig. 1, a plurality of photosensors 120 may be uniformly coupled to the surface of the spherical scintillator, the photosensors 120 may fill the entire surface of the spherical scintillator as much as possible, and the remaining surface is filled with a light collecting material.
In the embodiment of the present application, when the ray (γ) of the radiation source generates scintillation light in the spherical scintillator 110, the photosensor is used to collect (or collect) an optical signal corresponding to the scintillation light and convert the optical signal into an electrical signal (herein, may be understood as an optoelectronic signal), and the photosensor may send the collected optoelectronic signal to the data reading processing module.
It can be understood that referring to fig. 2, fig. 2 is a schematic diagram illustrating a process of collecting scintillation light of the rapid positioning device for a radiation source with a 4 pi viewing angle according to an embodiment of the invention. The area of scintillation light generated by the interaction of gamma rays within the spherical scintillator 110 can be considered a point because the area of scintillation light generation is negligible compared to the scintillator size. In the process of the scintillation light generated by the single gamma interaction propagating in the spherical scintillator 110, the closer the gamma ray interaction position is to the photosensor 120, the stronger the light intensity collected by the photosensor 120, and the larger the output photoelectric signal, because the light propagates in the 4pi direction and the light is attenuated in the propagation process.
The data reading processing module may be electrically connected to each of the plurality of light sensors 120. The data reading processing module is used for controlling the plurality of light sensors 120 to realize a rapid positioning method of the radiation source with the 4 pi visual angle, which is described below.
On the basis of the rapid positioning device for the radiation source with the 4 pi visual angle, the embodiment of the invention provides a radiation source positioning algorithm with the 4 pi visual angle, namely a rapid positioning method for the radiation source with the 4 pi visual angle, which can be applied to the rapid positioning device for the radiation source with the 4 pi visual angle. The rapid positioning method of the radiation source with the 4 pi visual angle can be executed by a data reading processing module in the rapid positioning device of the radiation source with the 4 pi visual angle so as to simply, rapidly, accurately and omnidirectionally determine the position of the radiation source.
Referring to fig. 3, fig. 3 is a flow chart of a method for rapidly positioning a radiation source with a4 pi viewing angle according to an embodiment of the present invention. The method may include the following steps S110-S130. The following is described in order:
s110, a plurality of photoelectric signals are continuously collected by a plurality of light sensors.
Wherein each set of optoelectronic signals comprises a plurality of signal intensity values, and one photosensor is used to collect one signal intensity value in one collection process. That is, a photosensor obtains a signal intensity value through light collection in one interaction. Wherein each set of photoelectric signals may characterize position information and intensity information of scintillation light generated in the scintillator by radiation of the radiation source.
In other words, the scintillation light propagates in the direction of 4pi in the scintillator during a single interaction with the scintillator, so that the plurality of photosensors can each collect a photoelectric signal representing the intensity of the light signal during the single interaction. Therefore, in the process of executing the rapid positioning method of the radiation source with the 4 pi visual angle, a plurality of light sensors can be controlled to continuously collect data for a plurality of times within a period of time, and all the light sensors can synchronously collect data in the process of collecting data each time, so that a plurality of continuous groups of photoelectric signals are collected, wherein the groups of photoelectric signals comprise the distribution of the generation positions of the scintillation light, the intensity information, the position of the radiation source (namely the azimuth information of the radiation source) and the type information of the radiation source, and the azimuth information of the radiation source can be calculated according to the groups of photoelectric signals. Where the positional information may include the direction of the radiation source within a 4pi field of view.
S120, determining the nuclide type of the radioactive source according to the plurality of groups of photoelectric signals.
Alternatively, the radionuclide type of the radioactive source may be determined from one or more sets of photoelectric signals.
In an alternative embodiment, S120, determining the nuclide type of the radioactive source according to the multiple sets of photoelectric signals may include the following steps 2.1-2.3:
And 2.1, acquiring the total signal intensity of one group of photoelectric signals in the plurality of groups of photoelectric signals.
For example, one set of calculated total signal strengths may be randomly chosen from a plurality of sets of optoelectronic signals.
And 2.2, analyzing a plurality of total signal intensities by using a digital multi-channel spectrometer to obtain the energy spectrum of the radioactive source.
And 2.3, determining the nuclide type according to the energy spectrum.
Specifically, in the event that a single ray interaction generates scintillation light, the photoelectric signal intensities of the plurality of photosensors are summed to obtain a total signal intensity corresponding to the event. Due to the scintillator characteristics, the number of scintillation light produced is proportional to the energy level of the incident gamma photon and also proportional to the total signal intensity of the plurality of photosensors. Therefore, a plurality of total signal intensities can be recorded and analyzed by using a digital multi-channel spectrometer, and the nuclide type of the radioactive source is identified by a nuclide identification method in the formed energy spectrum.
S130, determining the position information of the radioactive source according to the nuclide type and the plurality of groups of photoelectric signals.
Specifically, S130 may have the following two implementations, namely, mode 1 and mode 2.
Mode 1 may include the steps of:
And step 210, determining the incident direction of the rays according to the nuclide type and the intensity distribution of the plurality of groups of photoelectric signals so as to determine the position information of the radioactive source.
Specifically, step 210 may include the steps of:
1, for the collected multiple groups of photoelectric signals, determining the accumulated photoelectric signals corresponding to each optical sensor. Wherein the integrated photoelectric signal comprises an integrated signal intensity value. Specifically, multiple groups of photoelectric signals are collected in a preset time period, and the photoelectric signals after multiple events are accumulated for each optical sensor to obtain an accumulated photoelectric signal of each optical sensor in a measurement time (corresponding to the preset time period);
And 2, determining the azimuth information of the radioactive source according to the nuclide type and the distribution of the accumulated photoelectric signals corresponding to each photoelectric sensor. Specifically, for example, the largest integrated signal intensity value is determined from the positions of the plurality of photosensors and the integrated signal intensity value distribution thereof, and the position corresponding to the largest integrated signal intensity value is determined. Then, the azimuth information of the radiation source is determined based on the position corresponding to the maximum integrated signal intensity value and the center position of the spherical scintillator 110.
The specific resolving method for determining the azimuth information of the radioactive source is various, for example, the method for determining the direction according to the maximum value, the matching algorithm, the maximum likelihood algorithm or the method for resolving through the deep learning algorithm, and the method can be set according to the actual application requirement, and is not limited herein.
With this embodiment 1, the position of the radiation source can be resolved without passing through the position resolution scale, and the positioning accuracy can be improved.
Mode 2 may include the steps of:
in step 310, the generation position of the scintillation light corresponding to each group of photoelectric signals is determined according to the plurality of signal intensity values and the positions of the plurality of photosensors in each group of photoelectric signals.
Step 320, determining the azimuth information of the radioactive source according to the generation positions of the scintillation light corresponding to the multiple groups of photoelectric signals and the nuclide type.
It should be understood that by dispersing a plurality of photosensors on the surface of the three-dimensional scintillator, the rapid positioning device for the radiation source with the 4 pi viewing angle can sense the rays generated by the radiation source in all directions, interact (namely, scintillating light) with the three-dimensional scintillator, collect the interacted information through the sensor, and obtain the azimuth information of the radiation source after data analysis, so that the rapid positioning device for the radiation source with the 4 pi viewing angle provided by the application has the 4 pi viewing angle to maintain excellent positioning performance of the radiation source in any direction, and can simultaneously meet good energy resolution and position resolution in wide-viewing angle radiation detection so as to rapidly and accurately determine the position of the radiation source or the radiation hot zone in a nuclear terrorism event.
With embodiment 2 of the present application, a better positioning accuracy can be achieved.
In the above method embodiments, the three-dimensional scintillator may be in the shape of a sphere, a spheroid, a column, or the like, which is not limited. The above-described method embodiments will be described in more detail below with reference to specific examples (spherical in the shape of a three-dimensional scintillator). It will be appreciated that the following exemplary implementation principle can be generalized to a method for rapidly positioning a radiation source with a 4 pi viewing angle under the condition that the three-dimensional scintillator is in the shape of a cylinder (e.g., a cylinder), in which case, positioning of the radiation source in the form of an azimuth angle (360 ° viewing angle) can also be performed, and therefore, the simplified scheme (the three-dimensional scintillator is in the shape of a cylinder) is also within the scope of the present application.
The following will exemplify the shape of a three-dimensional scintillator as a sphere, and explain the steps in the above-described method embodiment with reference to fig. 1 and 2:
in an alternative embodiment, step 310, determining the generation position of the scintillation light corresponding to each group of photoelectric signals according to the plurality of signal intensity values and the positions of the plurality of light sensors in each group of photoelectric signals may include the following steps 1.1-1.2:
step 1.1, for the ith group of photoelectric signals in the multiple groups of photoelectric signals, obtaining the maximum signal intensity value and the corresponding signal intensity value in the ith group of photoelectric signals.
The maximum signal intensity value is collected by the first light sensor, and the corresponding signal intensity value is collected by the second light sensor, wherein the position of the second light sensor and the position of the first light sensor are symmetrical with respect to the center of the three-dimensional scintillator.
And 1.2, determining the generation position of the scintillation light corresponding to the ith group of photoelectric signals according to the maximum signal intensity value, the corresponding signal intensity value, the position of the first optical sensor and the diameter of the three-dimensional scintillator.
It will be appreciated that, through the above steps 1.1 and 1.2, it is possible to determine the locations (i.e. interaction locations) of the plurality of scintillation light generated by the radiation source within the scintillator over a period of time, and the distribution of these locations and the intensity information of these scintillation light are related to the location (i.e. orientation information of the radiation source) of the radiation source.
Specifically, step 1.2, determining the generation position of the scintillation light corresponding to the ith group of photoelectric signals according to the maximum signal intensity value, the corresponding signal intensity value, the position of the first photosensor and the diameter of the three-dimensional scintillator may include the following steps 1.21-1.22:
step 1.21, determining a first distance between a generation position of the scintillation light corresponding to the ith group of photoelectric signals and a position of the first photosensor according to the following formula (1):
(1)
Where D represents the first distance, D represents the diameter of the three-dimensional scintillator, L 1 represents the maximum signal intensity value, and L 2 represents the corresponding signal intensity value.
Step 1.22, determining the generation position of the scintillation light corresponding to the ith group of photoelectric signals according to the first distance and the position of the first light sensor.
Based on the principle of the scintillation light generated by the interaction of the gamma rays in the spherical scintillator 110 in the description of fig. 2, for the step of determining the generation position of the scintillation light corresponding to the ith group of photoelectric signals, please refer to fig. 2:
1, for a plurality of signal intensity values in the ith group of photoelectric signals, a maximum signal intensity value may be determined from the plurality of signal intensity values, and then a photosensor corresponding to the maximum signal intensity value is determined as a first photosensor. For example, assume that the photosensor a in fig. 2 corresponds to the maximum signal intensity value, and the position of the photosensor a is denoted as P1. The center of sphere of the spherical scintillator 110 is denoted as O. The light sensor B symmetrical to the light sensor A about the sphere center O is a second light sensor. The signal intensity value collected by the light sensor B is the corresponding signal intensity value, and the position of the light sensor B is denoted as P2.
The generation position of the scintillation light corresponding to the ith photoelectric signal (R (x, y, z)) is positionedAnd (3) upper part. The signal intensity value collected by the photosensor a is L 1, the signal intensity value collected by the photosensor B is L 2, and D is the diameter of the spherical scintillator 110.
3, Using the above formulaThe distance d between R (x, y, z) and P1 can be calculated. Thus, R (x, y, z) can be represented by d and P1.
In order to improve the accuracy of the generation position of the scintillation light corresponding to the ith group of photoelectric signals, in step 1.1, the centers of two photosensors with second or third high signal intensity can be found near the point P1, the standard deviation of the three photosensors is calculated, the three standard deviations are compared, and the photosensor with the smallest standard deviation is selected as the first photosensor to determine。
Specifically, step 1.1, for the ith group of photoelectric signals in the multiple groups of photoelectric signals, obtaining the maximum signal intensity value and the corresponding signal intensity value in the ith group of photoelectric signals may include the following steps 1.11-1.16:
step 1.11, acquiring N signal intensity values from a plurality of signal intensity values of the ith group of photoelectric signals.
The N signal intensity values are the top N values with the highest intensity value in the multiple signal intensity values of the ith group of photoelectric signals. In other words, the N signal intensity values are values of N before the intensity values are arranged in order from high to low among the plurality of signal intensity values of the i-th group photoelectric signal. N may be, for example, 2,3,4,5.
And step 1.12, respectively calculating the precision coefficient corresponding to each signal intensity value in the N signal intensity values.
In this embodiment, the precision coefficient may be represented by a standard deviation σ. Specifically, the calculation process of the standard deviation includes:
Taking photo sensor A as an example, first, find the O-point and connect with The standard deviation sigma 1 is calculated from the signal intensity values collected by one revolution of the photosensor perpendicular to and passing through the surface of the spherical scintillator 110 at the center point of the revolution of the photosensor. If R (x, y, z) is very close toThe signal intensity of the circle of light sensors is basically consistent according to the symmetry characteristic of the sphere, so that the standard deviation sigma 1 is a smaller value correspondingly. That is, the smaller the standard deviation is, the higher the accuracy of the data collected by the photosensor is, and the higher the accuracy of the corresponding generation position of the blinking light is.
And step 1.13, determining the signal intensity value with the highest precision coefficient among the N signal intensity values as the maximum signal intensity value.
Taking the standard deviation as an example, the smaller the standard deviation is, the higher the precision coefficient is.
And step 1.14, determining the optical sensor corresponding to the signal intensity value with the highest precision coefficient as a first optical sensor.
Step 1.15, determining a photosensor symmetrical to the position of the first photosensor about the center of the three-dimensional scintillator as a second photosensor.
Step 1.16, determining the signal intensity value collected by the second light sensor as a corresponding signal intensity value.
Alternatively, the above steps 1.21 to 1.22 may be replaced by a "layer contrast" method to calculate the position of the scintillation light corresponding to the ith group of photoelectric signals.
In an alternative embodiment, step 320 of determining the azimuth information of the radioactive source according to the generation positions of the scintillation lights and the nuclide types corresponding to the multiple groups of photoelectric signals may include step 3.1 of analyzing the generation positions of the scintillation lights and the nuclide types corresponding to the multiple groups of photoelectric signals by using a maximum likelihood analysis method or a trained neural network model (denoted as a radioactive source positioning model) to obtain the azimuth information of the radioactive source.
In particular, experimental data, a deep learning framework, and an artificial neural network model may be utilized to train a radiation source localization model. The radioactive source positioning model is integrated into a system of the rapid positioning device of the radioactive source with the 4 pi visual angle, so that the device can infer the position of the radioactive source in real time by utilizing the generation positions of the scintillation light corresponding to a plurality of groups of photoelectric signals and the nuclide types when detecting the radioactive source.
The method specifically comprises the following steps:
1, collecting an experimental data set relating to the positioning of the radiation source, including, for example, photosensor readings, radiation source position and type of species, and energy of the species, etc.
2, Preprocessing the experimental data set for training.
And 3, training the radioactive source positioning model by utilizing the preprocessed experimental data set and utilizing the deep learning framework and the artificial neural network model. The data set can be divided into a training set, a verification set and a test set, and model parameters are optimized by using the training set.
And 4, deploying the trained radioactive source positioning model into a system of the radioactive source positioning model, so that the model can process input data in real time and output accurate radioactive source positions.
In the method provided by the embodiment, the scintillator rich in hydrogen atoms can be selected to detect fast neutrons, and gamma and neutron signals are separated and positioned through pulse screening, so that the neutron source is positioned.
In the method provided in the foregoing embodiment, after determining the azimuth information of the radiation source according to the nuclide type and the multiple sets of photoelectric signals in S130, the multiple rapid positioning devices 100 with 4 pi viewing angles may be used to perform distributed arrangement, and for one radiation source, after each rapid positioning device 100 with 4 pi viewing angles obtains the azimuth information of the radiation source, the position information of the radiation source may be obtained through a geometric position.
According to the method embodiment, the application has the following beneficial effects:
1. The application is suitable for the places where radioactive substances are easy to leak, such as radiotherapy hospitals, nuclear power stations, radioactive laboratories and the like.
2. The application is suitable for realizing the high-precision radioactive source positioning in the 4 pi visual angle.
3. In the application, the spherical scintillator is filled with the photosensor as much as possible, the photosensor does not greatly block gamma rays, and the gamma radioactive source with the energy of 30-3000 keV can be positioned.
4. According to the structure of the radioactive source orientation device, which is based on the scheme of the application, the device integrating nuclide identification, dose rate measurement and radioactive source positioning can be realized by adding a data processing mode.
In order to perform the foregoing embodiments and the corresponding steps in each possible manner, an implementation manner of the data reading processing module in the rapid positioning device 100 for a radiation source with a4 pi viewing angle is given below, and referring to fig. 4, fig. 4 is a functional block diagram of a data reading processing module 300 according to an embodiment of the present invention. The data read processing module 300 may be used to implement the method shown in fig. 3 described above. It should be noted that, the basic principle and the technical effects of the data reading processing module 300 provided in this embodiment are the same as those of the above embodiment, and for brevity, reference should be made to the corresponding contents of the above embodiment. The data reading processing module 300 may include a transceiving 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 the data reading processing module 300 of the radiation source directing apparatus 100 shown in fig. 1 and may be executed by the data reading processing module 300. 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 300 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. 3 and the various method embodiments described above, without limitation.
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 (8)
1. The rapid positioning method for the radiation source with the 4 pi visual angle is characterized by being applied to a rapid positioning device for the radiation source with the 4 pi visual angle, wherein the rapid positioning device for the radiation source with the 4 pi visual angle comprises a three-dimensional scintillator and a plurality of photo sensors, the photo sensors are arranged on the surface of the three-dimensional scintillator in a scattered manner, when rays of the radiation source generate scintillation light in the three-dimensional scintillator through interaction, the photo sensors are used for collecting photoelectric signals corresponding to the scintillation light, the shape of the three-dimensional scintillator comprises a sphere, a spheroid or a columnar body, the spheroid comprises an ellipsoid or a Plastria regular polyhedron, and the columnar body comprises a cylinder or a columnar polyhedron;
the rapid positioning method of the 4 pi visual angle radioactive source comprises the following steps:
continuously collecting a plurality of groups of photoelectric signals by utilizing the plurality of light sensors, wherein each group of photoelectric signals comprises a plurality of signal intensity values, and one light sensor obtains one signal intensity value through light collection in one interaction;
determining the nuclide type of the radioactive source according to the multiple groups of photoelectric signals;
determining the incident direction of rays according to the nuclide type and the intensity distribution of the multiple groups of photoelectric signals so as to determine the azimuth information of the radioactive source;
Or determining the generation position of the scintillation light corresponding to each group of photoelectric signals according to a plurality of signal intensity values in each group of photoelectric signals and the positions of the plurality of light sensors, and determining the azimuth information of the radioactive source according to the distribution of the generation position of the scintillation light corresponding to the plurality of groups of photoelectric signals and the nuclide type.
2. The method for rapidly positioning a radiation source with a 4 pi viewing angle according to claim 1, wherein when the shape of the three-dimensional scintillator includes a sphere or a spheroid, determining a generation position of scintillation light corresponding to each group of photoelectric signals according to a plurality of signal intensity values in each group of photoelectric signals and positions of the plurality of photosensors, comprises the steps of:
For an ith photoelectric signal in the multiple groups of photoelectric signals, acquiring a maximum signal intensity value and a corresponding signal intensity value in the ith photoelectric signal, wherein the maximum signal intensity value is collected by a first light sensor, the corresponding signal intensity value is collected by a second light sensor, and the position of the second light sensor and the position of the first light sensor are symmetrical with respect to the three-dimensional scintillator;
And determining the generation position of the scintillation light corresponding to the ith group of photoelectric signals according to the maximum signal intensity value, the corresponding signal intensity value, the position of the first light sensor and the diameter of the three-dimensional scintillator.
3. The method according to claim 2, wherein determining the generation position of the scintillation light corresponding to the ith group of photoelectric signals according to the maximum signal intensity value, the corresponding signal intensity value, the position of the first photosensor, and the diameter of the three-dimensional scintillator comprises the steps of:
Determining a first distance between a generation position of the scintillation light corresponding to the ith group of photoelectric signals and a position of the first photosensor according to the following formula:
;
Wherein D represents the first distance, D represents a diameter of the three-dimensional scintillator, L 1 represents the maximum signal intensity value, and L 2 represents the corresponding signal intensity value;
and determining the generation position of the scintillation light corresponding to the ith group of photoelectric signals according to the first distance and the position of the first light sensor.
4. The method for rapidly positioning a radiation source with a 4 pi viewing angle according to claim 2, wherein for an ith group of photoelectric signals in the plurality of groups of photoelectric signals, obtaining a maximum signal intensity value and a corresponding signal intensity value in the ith group of photoelectric signals comprises the following steps:
Acquiring N signal intensity values from a plurality of signal intensity values of the ith group of photoelectric signals, wherein the N signal intensity values are the first N values with the highest intensity values in the plurality of signal intensity values of the ith group of photoelectric signals;
Respectively calculating the precision coefficient corresponding to each signal intensity value in the N signal intensity values;
Determining a signal intensity value with the highest precision coefficient in the N signal intensity values as the maximum signal intensity value;
determining a light sensor corresponding to the signal intensity value with the highest precision coefficient as the first light sensor;
determining a photosensor symmetrical to a position of the first photosensor with respect to the three-dimensional scintillator as the second photosensor;
the signal intensity values collected by the second light sensor are determined as the respective signal intensity values.
5. The method of claim 1-4, wherein the rapid 4 pi view radiation source positioning device further comprises a light collecting material for filling voids on the surface of the three-dimensional scintillator except for the plurality of photosensors.
6. The method of rapid positioning of a 4 pi viewing angle radioactive source according to any one of claims 1-4, wherein determining a radionuclide type of the radioactive source from the plurality of sets of photoelectric signals comprises the steps of:
Acquiring the total signal intensity of one group of photoelectric signals in the multiple groups of photoelectric signals;
Analyzing the total signal intensities by using a digital multichannel spectrometer to obtain the energy spectrum of the radioactive source;
and determining the nuclide type according to the energy spectrum.
7. The method for rapidly positioning a radiation source with a4 pi viewing angle according to any one of claims 1 to 4, wherein determining the azimuth information of the radiation source according to the distribution of the generation positions of the scintillation light corresponding to the plurality of groups of photoelectric signals and the nuclide type comprises the following steps:
and analyzing the generation positions of the scintillating light corresponding to the multiple groups of photoelectric signals and the nuclide types by using a maximum likelihood method or a trained neural network model so as to obtain the azimuth information of the radioactive source.
8. The rapid positioning device for the radiation source with the 4 pi visual angle is characterized by comprising a three-dimensional scintillator, a plurality of light sensors and a data reading and processing module, wherein the light sensors are arranged on the surface of the three-dimensional scintillator in a scattered manner;
The data reading processing module is used for controlling the plurality of light sensors to realize the rapid positioning method of the 4 pi visual angle radioactive source according to any one of claims 1 to 7.
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| US6940071B2 (en) * | 2000-10-11 | 2005-09-06 | University Of Southampton | Gamma-ray spectrometry |
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| US8067742B2 (en) * | 2006-06-13 | 2011-11-29 | Space Micro Inc. | Apparatus and method for detection, location, and identification of gamma sources |
| KR101051126B1 (en) * | 2008-09-19 | 2011-07-21 | 한국원자력 통제기술원 | Plastic Scintillator-based Radiation Detector and Radionuclide Detection Method Using the Same |
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| CN102017010A (en) * | 2008-05-08 | 2011-04-13 | 浜松光子学株式会社 | Scintillator, method for manufacturing scintillator, and radiation detector |
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