CN119165520A - A gamma position sensitive detection system based on scintillator array end-face imaging - Google Patents
A gamma position sensitive detection system based on scintillator array end-face imaging Download PDFInfo
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- CN119165520A CN119165520A CN202411256975.0A CN202411256975A CN119165520A CN 119165520 A CN119165520 A CN 119165520A CN 202411256975 A CN202411256975 A CN 202411256975A CN 119165520 A CN119165520 A CN 119165520A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01T—MEASUREMENT OF NUCLEAR OR X-RADIATION
- G01T1/00—Measuring X-radiation, gamma radiation, corpuscular radiation, or cosmic radiation
- G01T1/36—Measuring spectral distribution of X-rays or of nuclear radiation spectrometry
- G01T1/362—Measuring spectral distribution of X-rays or of nuclear radiation spectrometry with scintillation detectors
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01T—MEASUREMENT OF NUCLEAR OR X-RADIATION
- G01T1/00—Measuring X-radiation, gamma radiation, corpuscular radiation, or cosmic radiation
- G01T1/36—Measuring spectral distribution of X-rays or of nuclear radiation spectrometry
- G01T1/366—Measuring spectral distribution of X-rays or of nuclear radiation spectrometry with semi-conductor detectors
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01T—MEASUREMENT OF NUCLEAR OR X-RADIATION
- G01T7/00—Details of radiation-measuring instruments
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Abstract
The invention discloses a gamma position sensitive detection system based on scintillator array end face imaging, which comprises a scintillator array group, an optical fiber image transmission beam, an imaging lens and a computer, wherein the scintillator array group is used for generating a first scintillation light signal of a vertical end face and a second scintillation light signal of a horizontal end face through gamma/X ray irradiation to be detected, the optical fiber image transmission beam is used for combining the first scintillation light signal and the second scintillation light signal and transmitting the first scintillation light signal and the second scintillation light signal to an image transmission beam terminal, the imaging lens is used for imaging the scintillation light signal of the image transmission beam terminal to an image sensor, and the computer is used for analyzing the luminescence color and intensity information received by the image sensor. According to the invention, the end face luminescence of the scintillator array group in the vertical direction and the horizontal direction is combined to one terminal, the end face luminescence images in the vertical direction and the horizontal direction can be recorded simultaneously by only one image sensor, the equipment cost is saved, and the real-time monitoring of the two-dimensional center position and the time and space distribution of the gamma/X rays to be detected can be realized by only one-dimensional scintillator array.
Description
Technical Field
The invention belongs to the technical field of pulse radiation detection, and particularly relates to a gamma position sensitive detection system based on scintillator array end face imaging, which is suitable for measuring an ultrafast pulse gamma/X ray time spectrum under the conditions of small beam spot size and space alignment requirement, and particularly has the capacity of realizing spatial position resolution below 400 mu m.
Background
The existing third generation and fourth generation light sources such as hard X-ray free electron laser, synchronous radiation light source, strong laser driving Betatron radiation, inverse Compton scattering gamma ray source and the like have the common characteristics of good directivity, micro beam spots, ultrafast time characteristics and the like. The information such as the position and the spatial distribution of the ultra-fast pulse gamma/X rays can reflect the working states of the light source system and the experimental device, and the work such as beam collimation and debugging and the position correction of the experimental system can be guided by analyzing the information of the position and the spatial distribution of the gamma/X rays. The X-ray position sensitive detector is an indispensable important component on the synchrotron radiation beam line, and real-time data of the beam position and intensity provided by the detector is an important basis for monitoring the running state of the beam line. The gamma/X-ray beam spot size used in applications such as precision calibration of aerospace gamma detectors, industrial imaging, tomography, etc. is typically on the order of mm and requires high stability. The multi-party application provides higher requirements for the position and spatial distribution monitoring of the ultra-fast pulse microbeam spot gamma/X rays so as to meet the monitoring requirements on the light intensity, the beam spot position and the movement track thereof.
The monitoring of the gamma/X-ray spatial position and time spectrum can be realized by adopting a real-time imaging technology. Current gamma/X-ray imaging techniques typically rely on image plates (IMAGING PLATE/IP), scintillation screens, CCD image sensors, and the like. The imaging system based on the IP board must take the IP board out of the experimental system, the image information can be obtained by releasing the light energy of the latent image in the IP board through laser scanning, the off-line imaging can not obtain the image information in real time, the IP board can be reused only by erasing the residual latent image by using high-intensity light, the exposure reuse times are limited, and the cost is increased. In the scintillation imaging detection system, a scintillation screen is used for converting gamma/X rays into visible light signals, and then an image sensor is used for imaging detection, in the scintillation imaging detection system with a compact structure, a light glue pasting mode is generally adopted for coupling between the scintillation screen and the image sensor (CCD/CMOS), the coupling process requirement is high, the image sensor and the scintillation screen can be exposed in an irradiation environment together, the radiation resistance of the image sensor is poor, the coupling component is possibly scrapped due to damage of any CCD/CMOS chip, the consumption cost is increased, and in addition, the adhesion mode enables different scintillation screens and the image sensor to be incapable of being matched freely, so that a plurality of limitations exist.
The series of problems lead to the fact that the prior art cannot meet the urgent requirements of high-quality, high-efficiency and high-reliability monitoring of ultra-fast pulse gamma/X-ray microbeam spots.
Disclosure of Invention
In order to solve the technical problems, the invention provides a gamma position sensitive detection system based on scintillator array end face imaging, so as to solve the problems in the prior art.
To achieve the above object, the present invention provides a gamma position sensitive detection system based on scintillator array end face imaging, comprising:
the scintillator array group is used for generating a first scintillation light signal of a vertical end face and a second scintillation light signal of a horizontal end face through gamma/X ray irradiation to be detected;
The optical fiber image transmission beam is used for combining the first scintillation optical signal and the second scintillation optical signal and transmitting the combined first scintillation optical signal and the combined second scintillation optical signal to an image transmission beam terminal;
An imaging lens for imaging the scintillation light signal of the image sensing beam terminal to the image sensor;
and the computer is used for analyzing the luminous color and intensity information received by the image sensor and realizing real-time monitoring of the gamma/X-ray two-dimensional center position and the time-space distribution to be detected based on the analysis result.
Preferably, the scintillator array set includes two identical one-dimensional scintillator arrays vertically stacked on each other.
Preferably, the one-dimensional scintillator array comprises one or two scintillator materials, wherein the one-dimensional scintillator array comprising two scintillator materials has only one scintillator at a central position and the material of the scintillator at other positions is different.
Preferably, the one-dimensional scintillator array further comprises ESR total reflection films, wherein the ESR total reflection films are alternately arranged with the scintillator crystals.
Preferably, hard glass is additionally arranged on the upper surface and the lower surface of the scintillator array group for protection, a hollowed-out design is reserved in the central area of the hard glass so as to realize gamma/X rays to irradiate the central area of the scintillator array group, and an aluminum clamp is connected to one side of the scintillator array group, which is not a light emitting surface, and is used for supporting the scintillator array group.
Preferably, the optical fiber image transmission beam is two-in-one, and comprises a first bifurcation end, a second bifurcation end, a transmission optical fiber and an image transmission beam terminal.
Preferably, the vertical end face and the horizontal end face of the scintillator array group are respectively connected with the first bifurcation end and the second bifurcation end of the optical fiber image transmission beam, and the other ends of the optical fiber image transmission beams are combined together to form an image transmission beam terminal.
Preferably, the pixels of the first bifurcation end and the second bifurcation end of the optical fiber image transmission beam are in one-to-one correspondence with the terminal pixels.
Preferably, the imaging device further comprises an electric displacement frame, wherein the distance between the optical fiber image transmission beam terminal and the imaging lens is adjusted through the electric displacement frame, so that high-quality imaging is achieved.
Preferably, the device further comprises a movable clamp, wherein the movable clamp clamps the aluminum clamp to realize the position adjustment of the scintillator array set so as to realize the gamma/X-ray irradiation to be measured on the scintillator array set.
Compared with the prior art, the invention has the following advantages and technical effects:
The invention provides a gamma position sensitive detection system based on scintillator array end face imaging, which emits light through the end faces of the scintillator array groups in the vertical direction and the horizontal direction, transmits an image beam through an optical fiber, and images the image to an image sensor, so that the high-precision resolution of the horizontal two-dimensional center position of ultra-fast microbeam spot gamma rays below 400 mu m can be realized, the functions of acquiring the spatial distribution and the time spectrum of the microbeam spot gamma rays are realized through real-time on-line monitoring, and the monitoring requirements on the light intensity, the spot position and the movement track of the spot gamma rays are met.
The system adopts the two-in-one optical fiber image transmission beam as an imaging transmission unit, has the advantages of light weight, softness, flexibility, flexible operation and the like, combines the end face luminescence beams in the vertical direction and the horizontal direction of the scintillator array group to one terminal, can record the end face luminescence images in the vertical direction and the horizontal direction simultaneously only by one image sensor, and saves equipment cost. In addition, the system has compact structure, can be freely disassembled and assembled by adopting a mechanical coupling mode, and realizes repeated use.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application. In the drawings:
FIG. 1 is a schematic diagram of a gamma position sensitive detection system according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a scintillator array set in accordance with an embodiment of the present invention;
FIG. 3 is a schematic diagram of a hard glass clamped scintillator array package in accordance with an embodiment of the present invention;
FIG. 4 is a schematic diagram of a gamma position sensitive detection system according to an embodiment of the present invention;
FIG. 5 is a graph showing experimental results of end-face luminescence of a gamma-ray irradiated scintillator array set according to an embodiment of the present invention;
FIG. 6 is a graph showing the results of an experiment for illuminating the end face of a scintillator array set with X-rays according to an embodiment of the present invention;
1, a scintillator array group; 2, a movable clamp, 3, a first bifurcation end of an optical fiber image transmission beam, 4, a second bifurcation end of the optical fiber image transmission beam, 5, a transmission optical fiber of the optical fiber image transmission beam, 6, an image transmission beam terminal, 7, an imaging lens, 8, an electric displacement frame, 9, an image sensor, 10, a computer, 11, a scintillation crystal, 12, a first ESR total reflection film, 13, a second ESR total reflection film, 14, gamma/X rays, 15, a vertical end face y direction, 16, a horizontal end face X direction, 17, an aluminum clamp connector, 18, hard glass, 19 and gamma light spots.
Detailed Description
It should be noted that, without conflict, the embodiments of the present application and features of the embodiments may be combined with each other. The application will be described in detail below with reference to the drawings in connection with embodiments.
It should be noted that the steps illustrated in the flowcharts of the figures may be performed in a computer system such as a set of computer executable instructions, and that although a logical order is illustrated in the flowcharts, in some cases the steps illustrated or described may be performed in an order other than that illustrated herein.
Example 1
As shown in fig. 1, the present embodiment provides a gamma position sensitive detection system based on scintillator array end face imaging, which includes:
A scintillator array set 1 for generating a first scintillation signal of a vertical end face and a second scintillation signal of a horizontal end face by gamma/X-ray irradiation to be measured;
The optical fiber image transmission beam 5 is used for combining the first scintillation optical signal and the second scintillation optical signal and transmitting the combined first scintillation optical signal and the combined second scintillation optical signal to the image transmission beam terminal 6;
an imaging lens 7 for imaging a scintillation light signal of the image-beam-sensing terminal to the image sensor 9;
And the computer 10 is used for analyzing the luminous color and intensity information received by the image sensor and realizing real-time monitoring of the gamma/X-ray two-dimensional center position and the time-space distribution to be detected based on the analysis result.
The system comprises the implementation steps that gamma/X rays 14 to be detected irradiate on a scintillator array set 1, scintillation light signals are generated in the y direction 15 of the vertical end face and the X direction 16 of the horizontal end face of the scintillator array set respectively, the scintillation light signals are transmitted to an image transmission beam terminal 6 through an optical fiber image transmission beam connected with the scintillator array set 1, the scintillation light is imaged through an imaging lens 7, the imaging lens 7 images the scintillation light of the optical fiber image transmission beam terminal to an image sensor 9, and the image sensor 9 photographs the imaged scintillation light. The computer 10 is used for analyzing the color and intensity information of the image luminescence in the vertical direction and the horizontal direction, so that the real-time monitoring of the position and the time-space distribution of the gamma/X-ray two-dimensional center to be detected is realized.
In addition, the system further comprises a movable clamp 2, and the movable clamp 2 clamps the aluminum clamp to realize the position adjustment of the scintillator array set 1 so as to realize the irradiation of gamma/X rays 14 to be measured on the scintillator array set 1.
As shown in fig. 3, the scintillator array set 1 is formed by overlapping two identical one-dimensional scintillator arrays vertically, hard glass 18 is added on the upper and lower surfaces of the scintillator array set 1, a hollow design is left in the central area of the hard glass 18 to achieve gamma/X-ray alignment and irradiation of the central area of the scintillator array set, and an aluminum clamp connector 17 is connected to one non-light-emitting surface of the scintillator array set to support the scintillator array set 1.
Further, the one-dimensional scintillator array comprises one or two scintillation crystal materials, the one-dimensional scintillator array comprising one material adopts LYSO or GAGG crystals, and only one scintillation crystal at the central position of the one-dimensional scintillator array comprising two materials is different from the materials at other positions, for example, the central position of the one-dimensional scintillator array adopts GAGG scintillation crystal, and the other positions adopt LYSO scintillation crystal;
As shown in fig. 2, the one-dimensional scintillator array is formed by alternately arranging the scintillation crystal 11 and the second ESR total reflection film 13, the pixel size of the one-dimensional scintillator array is less than or equal to 0.4mm by 0.4mm, the pixel length is designed according to the beam spot size, the upper surface and the lower surface of the scintillator array cover the first ESR total reflection film 12, only one end surface of each array is used as a light emitting surface, the other end surface covers the second ESR total reflection film 13 with a certain thickness and the peripheral aluminum foil, and the two light emitting surfaces of the scintillator array group 1 are connected with an optical fiber image transmission beam.
Further, the optical fiber image transmission beam is two-in-one, and comprises a first bifurcation end 3, a second bifurcation end 4, a transmission optical fiber 5 and an image transmission beam terminal 6.
Further, the vertical end face and the horizontal end face of the scintillator array group are respectively connected with the first bifurcation end 3 and the second bifurcation end 4 of the optical fiber image transmission beam, and the other ends of the optical fiber image transmission beams are combined together to form an image transmission beam terminal 6.
Specifically, the vertical end surface y direction 15 and the horizontal end surface x direction 16 of the scintillator array set 1 are respectively connected with the first bifurcation end 3 and the second bifurcation end 4 of the optical fiber image transmission beam, the other ends of the two optical fiber image transmission beams are combined together to form an optical fiber image transmission beam terminal 6, the lengths of the first bifurcation end 3 and the second bifurcation end 4 of the optical fiber image transmission beam can be designed according to the requirement, and the pixel size of the optical fiber image transmission beam is smaller than 0.03mm.
Further, pixels of the first branch end 3 of the optical fiber image transmission beam connected with the vertical end surface and pixels of the second branch end 4 of the optical fiber image transmission beam connected with the horizontal end surface of the scintillator array assembly 1 are in one-to-one correspondence with pixels of the image transmission beam terminal 6.
Further, the system further comprises an electric displacement frame, and the distance between the optical fiber image transmission beam terminal and the imaging lens is adjusted through the electric displacement frame, so that high-quality imaging is achieved.
Specifically, the optical fiber image transmission beam terminal 6 is arranged on an electric displacement frame 8, an imaging lens 7 is arranged behind the image transmission beam terminal 6, and the distance between the optical fiber image transmission beam terminal 6 and the imaging lens 7 can be adjusted through the electric displacement frame 8;
the focal length of the imaging lens 7 is 400mm, the F number is 8, the lens thickness is 10mm, and the curvature radius is-1927.446 mm.
The image sensor 9 adopts a color high-resolution CCD, the pixel size is less than or equal to 3.75 mu m multiplied by 3.75 mu m, the effective photosensitive area is 4.8mm multiplied by 3.6mm, and the light emitting spectrum (visible light wave band) of the scintillator array is in the spectrum receiving range of the image sensor 9;
The scintillation light image is analyzed by a computer to obtain color and intensity information, and the spatial distribution position and the time spectrum of gamma ray spots can be determined through back-pushing.
In this embodiment, the optical signal transmitted by the optical fiber image-transmitting beam is accumulated and emitted by the scintillation crystal, and the gray value identification can be performed on the image obtained by the image sensor, as shown in the gamma/X-ray position sensitive detection schematic diagram shown in fig. 4, the two-dimensional position of the gamma light spot 19 on the scintillator array group 1 is found according to the one-to-one corresponding positional relationship between the pixels of the first bifurcation end 3 and the second bifurcation end 4 of the optical fiber image-transmitting beam and the terminal pixels, the position with the brightest X-direction is ⑥ bits, and the position with the brightest y-direction is ⑥ bits, so that the coordinate (⑥,⑥) is the central position of the gamma/X-ray 14, and the system can realize the high-precision resolution of the two-dimensional central position with the level below 400 μm because the size of the scintillation array pixels is less than or equal to 400 μm. Meanwhile, the spatial distribution of the gamma/X-rays 14 can be judged in combination with other light emitting positions. The image sensor 9 is used for continuously and rapidly photographing the flash light imaging, the computer 10 is used for analyzing the gray value and the color of the two-dimensional luminous image, the change condition of the luminous intensity of the flash body along with the time and the luminous spectrum can be judged, and the on-line monitoring of the ultra-fast gamma/X-ray time spectrum is realized.
Experimental studies were performed using a 1.25MeV direct current gamma ray source (cobalt source) to demonstrate the effectiveness of the developed position sensitive detection system. The two image sensors 9 of black and white and color are adopted to image the two directions of the horizontal direction and the vertical direction of the scintillator array group 1 respectively, and experimental results are shown in fig. 5, so that the whole view field is illuminated to different degrees, the color camera can reflect the color of the flickering visible light, and the experimental estimation of relative sensitivity of the system gamma can be realized by matching with data such as brightness, optical attenuator multiple and the like.
Experimental studies were performed using X-rays of 140keV and 500 μa, and the obtained luminescence images in the horizontal X-direction and the vertical Y-direction are shown in fig. 6.
The present application is not limited to the above-mentioned embodiments, and any changes or substitutions that can be easily understood by those skilled in the art within the technical scope of the present application are intended to be included in the scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.
Claims (10)
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