CN211043685U - Array type nuclear radiation detector based on GAGG scintillator - Google Patents
Array type nuclear radiation detector based on GAGG scintillator Download PDFInfo
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- CN211043685U CN211043685U CN201922177349.3U CN201922177349U CN211043685U CN 211043685 U CN211043685 U CN 211043685U CN 201922177349 U CN201922177349 U CN 201922177349U CN 211043685 U CN211043685 U CN 211043685U
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Abstract
The utility model discloses an array nuclear radiation detector based on GAGG scintillator, including scintillator, photoelectric conversion device, front end electronics and electrical power generating system, the GAGG scintillator array that the GAGG scintillator that the scintillator is a plurality of six face polishings constitutes fills high reflecting material between the scintillator as the reflector layer, and photoelectric conversion device has a plurality ofly and constitutes the photoelectric conversion device array that matches with GAGG scintillator array. The GAGG scintillator array and the photoelectric conversion device array are coupled through high-refractive-index optical cement. The detector adopts an array mode, can form a large-area detector, simultaneously carries out independent reading and consistency correction on each channel, and realizes quick measurement under the condition of a low radiation field; in thatUnder the environment of a strong radiation field, an independent working mode of each channel can be adopted, and the upper limit of measurement of the system is improved. The whole detector pair137The energy resolution of Cs (662 keV) can reach within 5 percent, which is better than sodium iodide and cesium iodide detectors.
Description
Technical Field
The utility model relates to a nuclear radiation detection, concretely relates to array nuclear radiation detector based on GAGG scintillator belongs to nuclear radiation detection technical field.
Background
The nuclear radiation detector commonly used in the market at present mainly comprises a scintillator detector and a semiconductor detector, wherein the scintillator detector is mainly formed by coupling a scintillator and a photomultiplier tube (PMT), and the scintillator is mainly formed by sodium iodide (NaI (Tl)), cesium iodide (CsI) and lanthanum bromide (L aBr)3) Etc., the photomultiplier tube is typically selected to match the scintillator size and wavelength. Their energy resolution is best for lanthanum bromide, and poor for sodium iodide and cesium iodide.
Although the sodium iodide and cesium iodide detectors are cheap, the energy resolution is poor, the performance stability is poor, and the deliquescence is easy; lanthanum bromide detectors have been a new type of detector developed for some time recently, and have better energy resolution and stability than sodium iodide and cesium iodide detectors, but lanthanum bromide scintillators are expensive, deliquescent and have spontaneous emission. In order to meet the capability of quick response under the condition of low dose rate, the scintillator detector needs to enlarge the effective sensitive area of the detector so as to improve the detection efficiency, but the effective sensitive area of the detector is enlarged, so that the problems of high processing technology requirement and saturation under the condition of high dose rate exist. Therefore, the conventional nuclear radiation detector cannot simultaneously take measures in a low-dose-rate environment and a high-dose-rate environment into consideration.
Disclosure of Invention
The above-mentioned not enough to prior art exists, the utility model aims to provide a array nuclear radiation detector based on GAGG scintillator, this nuclear radiation detector stable performance, compromise the relation of detection efficiency and the effective sensitive area of detector well to the processing technology requirement has been reduced. And simultaneously, the measurement in the environments of low dose rate and high dose rate is met.
In order to realize the purpose, the utility model discloses a technical scheme as follows:
the array type nuclear radiation detector based on the GAGG scintillator comprises the scintillator, a photoelectric conversion device, front-end electronics and a power supply system, wherein the scintillator is used for detecting X rays or gamma rays and inputting generated optical signals to the photoelectric conversion device; the photoelectric conversion device is used for converting the optical signal generated by the scintillator into an electric pulse signal; the front-end electronics is used for reading, amplifying, filtering and shaping the electric pulse signals output by the photoelectric conversion device and outputting the signals; the power supply system is used for supplying power to the photoelectric conversion device and the front-end electronics; the method is characterized in that: the scintillator is a GAGG scintillator array formed by a plurality of GAGG scintillators with polished six surfaces, and a plurality of photoelectric conversion devices correspond to the scintillators one by one in number; a plurality of photoelectric conversion devices form a photoelectric conversion device array matched with the GAGG scintillator array and are welded on the same circuit board; the output of each photoelectric conversion device is connected with the front-end electronic input.
The reflecting material is filled between the scintillators to serve as a reflecting layer, the reflecting layer wraps four side faces and one end face of each scintillator, only one end face is exposed to serve as a light emergent face, and the whole formed by the reflecting material and the scintillator array is rectangular.
The reflecting material is BaSO4、TiO2ESR film, Teflon or MgO, the reflection efficiency of the reflecting material is more than or equal to 90 percent.
The photoelectric conversion device is SiPM or MPPC.
The whole rectangular body formed by the reflecting material and the scintillator array is fixedly bonded on the photoelectric conversion device array through high-transmittance optical cement, and the end face of each scintillator is bonded with the photoelectric conversion device in a one-to-one correspondence mode and used for transmitting all the scintillation light of the scintillator to an incidence window of the photoelectric conversion device as far as possible.
The photon extraction efficiency of each scintillator pixel is more than or equal to 90 percent.
The refractive index of the optical cement is larger than or equal to 1.5, so that the total reflection angle of incident light is reduced.
The whole detector pair137The Cs (662 keV) energy resolution is less than or equal to 5 percent.
Compared with the prior art, the utility model discloses following beneficial effect has:
1. the utility model discloses a GAGG scintillation body array, GAGG scintillation body are the novel inorganic scintillation body that has developed in recent years, have density height, effective atomic number is big, light yield is high, decay time is fast, energy resolution is good, advantages such as materialization stable performance. The emission spectrum and the transmission spectrum of the crystal are partially overlapped, so that the crystal has self-absorption, the energy resolution of the crystal and a photoelectric conversion device can reach within 5 percent, and the energy resolution is slightly lower than that of a lanthanum bromide detector and higher than that of a sodium iodide detector and a cesium iodide detector.
2. The photoelectric conversion devices such as SiPM and MPPC adopted by the detector have the advantages of small volume, no need of high voltage, stable performance and the like.
3. The array type nuclear radiation detector based on the GAGG scintillator has small volume and light weight, and improves the portability. Compared with other nuclear radiation detectors adopting photomultiplier tubes (PMT), the nuclear radiation detector has no high voltage inside the instrument, and the safety performance is greatly improved.
4. The GAGG scintillator array and the photoelectric conversion device array are coupled in a one-to-one mode, each channel is read independently, light is not mixed with each other, light is not leaked, the GAGG scintillator array and the photoelectric conversion device array can be read independently and displayed, the GAGG scintillator array and the photoelectric conversion device array can be superposed together to display, and meanwhile measurement under the environment with low dose rate and high dose rate is met.
Drawings
Fig. 1-schematic diagram of an array detector for nuclide identification according to the present invention.
Fig. 2-the signal transmission flow chart of the present invention.
Figure 3-scintillator array schematic of the present invention.
Fig. 4-schematic diagram of the photoelectric conversion device array of the present invention.
Fig. 5-schematic illustration of scintillator array and photoelectric conversion device coupling.
FIG. 6-GAGG scintillator transmission spectrum.
FIG. 7-GAGG scintillator emission spectra.
Wherein, 1-GAGG scintillator array; 10-GAGG scintillator; 11-a light reflective material; 2-an array of photoelectric conversion devices; 20-a photoelectric conversion device; 21-a photoelectric conversion device array circuit board; 3-front end electronics and power supply system.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Referring to fig. 1, it can be seen from the figure that the array nuclear radiation detector based on the GAGG scintillator of the present invention includes a GAGG scintillator array 1, a photoelectric conversion device array 2, a front-end electronics and power supply system 3, where the scintillator is used to detect X-rays or gamma-rays and input the generated optical signal to the photoelectric conversion device; the photoelectric conversion device is used for converting the optical signal generated by the scintillator into an electric pulse signal; the front-end electronics is used for reading, amplifying, filtering and shaping the electric pulse signals output by the photoelectric conversion device and outputting the signals; the power supply system is used for supplying power to the photoelectric conversion device and the front-end electronics. The utility model is improved in that the scintillator is a plurality of GAGG scintillator arrays 1 composed of a plurality of GAGG scintillators 10 with six polished surfaces, and a plurality of photoelectric conversion devices 20 are provided, and the number of the photoelectric conversion devices corresponds to that of the scintillators one by one; the plurality of photoelectric conversion devices 20 form a photoelectric conversion device array 2 matched with the GAGG scintillator array 1 and are welded and fixed on a photoelectric conversion device array circuit board 21; the output of each photoelectric conversion device 20 is connected to a front-end electronic input.
As can be seen from the transmission spectrum and the emission spectrum of the GAGG scintillator in FIGS. 6 and 7, the transmission spectrum and the emission spectrum of the GAGG scintillator overlap in a certain wavelength range (425 nm-500 nm), so that the scintillator has self-absorption, and the phenomenon of the scintillator self-absorption is more serious when the volume of the scintillator is larger. Therefore, the utility model discloses with the array form of GAGG scintillator design for a plurality of constitutions, single scintillator volume is less like this, and every scintillator both can the autonomous working, also can all scintillators as a whole work, self-absorption problem when having overcome the increase of scintillator volume from this, realizes the needs of big detection area again.
The signal transmission process of the array nuclear radiation detector comprises the following steps: after entering the scintillator, the X-ray or the gamma-ray is converted into scintillator light, the scintillation light enters the photoelectric conversion device and is converted into an electric signal, the electric signal enters front-end electronics for amplification, filtering and forming, and finally, the processed signal is output.
The reflecting materials 11 are filled among all the GAGG scintillators 10, the reflecting materials 11 wrap four side surfaces and one end surface of all the GAGG scintillators 10 and only expose one end surface as a light-emitting surface, and the whole formed by the reflecting materials 11 and the scintillator array is rectangular.
The reflecting material 11 is BaSO4、TiO2Teflon, MgO or ESR film, the reflection efficiency of the reflecting material is more than or equal to 90 percent.
The photoelectric conversion device 20 is a silicon photomultiplier (SiPM) or a multi-pixel photon counter (MPPC).
The whole rectangular body formed by the reflecting material and the scintillator array is fixed on the photoelectric conversion device array 2 through high-transmittance silicone grease in an adhering mode, and the end portion of each GAGG scintillator 10 is adhered to the photoelectric conversion device 20 in a one-to-one corresponding mode and used for transmitting all the scintillation light of the scintillator to an entrance window of the photoelectric conversion device as far as possible.
In one embodiment, the GAGG scintillator array 1 consists of 49 six-sided polished 6mm × 6mm × 6mm scintillators in a 7 × 7 array, with a highly reflective material BaSO filled between the scintillators4As the reflective layer, the reflective layer gap was 1mm (i.e., the face-to-face spacing between adjacent scintillators was 1 mm).
The photoelectric conversion device array 2 adopts 60035 series silicon photomultiplier of the company of armeniaca (ONSemiconductor), and totally 49 silicon photomultiplier form a 7 × 7 array, and each photoelectric conversion device corresponds to a GAGG scintillator array one by one.
The GAGG scintillator array and the photoelectric conversion device array are coupled by EJ-550 silicone grease, the refractive index of EJ-550 silicone grease optical glue is larger than or equal to 1.5, the total reflection angle of incident light is reduced by adopting high-refractive-index optical glue, and the GAGG scintillator array and the photoelectric conversion device array are used for transmitting all the scintillation light of the scintillator to an incident window of the photoelectric conversion device as far as possible.
The front-end electronics is used for reading, amplifying, filtering, shaping, etc. an electric pulse signal output from the photoelectric conversion device, and outputting the signal.
The power supply system is used for providing 26-30V voltage for the photoelectric conversion device and +/-5V voltage for front-end electronics.
The following is a table comparing the performance of the scintillators used in the nuclear radiation detector with the performance of the scintillators commonly used.
As can be seen from the above table, the emission wavelength of the GAGG scintillator adopted by the nuclear radiation detector is equivalent to CsI (T1), the refractive index is the largest, so that an optical glue with high refractive index is required to be adopted, and the attenuation time is slightly lower than L aBr and is better than that of NaI (T1) and CsI (T1)3The density is maximum, the detection efficiency is highest under the condition of the same volume, the energy resolution is better than NaI (T1) and CsI (T1) and is slightly lower than L aBr3。
The utility model discloses nuclear radiation detector mainly comprises GAGG scintillator array, photoelectric conversion device array, front end electronics and electrical power generating system. The GAGG scintillator array is composed of a plurality of GAGG scintillators, highly reflective materials (such as BaSO4, TiO2, ESR films, Teflon, MgO and the like) are filled among the scintillators to be used as a reflective layer, and the reflective efficiency is more than or equal to 90%; the photoelectric conversion device array is composed of a plurality of photoelectric conversion devices (SiPM or MPPC), each photoelectric conversion device corresponds to the GAGG scintillator array one by one, and light is not mixed and leaked among scintillator pixels; the GAGG scintillator array and the photoelectric conversion device array are coupled through high-refractive-index optical cement, and the refractive index of the optical cement is larger than or equal to 1.5; front-end electronics for reading, amplifying, filter shaping, etc. of the nuclear radiation signals; the power supply system is used for supplying power to the photoelectric conversion device array and the front-end electronics. The detector adopts an array mode, can form a large-area detector, simultaneously carries out independent reading and consistency correction on each channel, and realizes quick measurement under the condition of a low radiation field; under the environment of a strong radiation field, an independent working mode of each channel can be adopted, and the upper limit of measurement of the system is improved. The whole detector pair137The energy resolution of Cs (662 keV) can reach within 5 percent, which is better than sodium iodide and cesium iodide detectors.
The above embodiments of the present invention are merely examples for illustrating the present invention and are not intended to limit the embodiments of the present invention. Variations and modifications in other variations will occur to those skilled in the art upon reading the foregoing description. Not all embodiments are exhaustive. All obvious changes or variations which are introduced by the technical solution of the present invention are still within the scope of the present invention.
Claims (7)
1. The array type nuclear radiation detector based on the GAGG scintillator comprises the scintillator, a photoelectric conversion device, front-end electronics and a power supply system, wherein the scintillator is used for detecting X rays or gamma rays and inputting generated optical signals to the photoelectric conversion device; the photoelectric conversion device is used for converting the optical signal generated by the scintillator into an electric pulse signal; the front-end electronics is used for reading, amplifying, filtering and shaping the electric pulse signals output by the photoelectric conversion device and outputting the signals; the power supply system is used for supplying power to the photoelectric conversion device and the front-end electronics; the method is characterized in that: the scintillator is a GAGG scintillator array formed by a plurality of GAGG scintillators with polished six surfaces, and a plurality of photoelectric conversion devices correspond to the scintillators one by one in number; a plurality of photoelectric conversion devices form a photoelectric conversion device array matched with the GAGG scintillator array and are welded on the same circuit board; the output of each photoelectric conversion device is connected with the front-end electronic input.
2. The array type nuclear radiation detector based on the GAGG scintillator as claimed in claim 1, wherein: the reflecting material is filled between the scintillators to serve as a reflecting layer, the reflecting layer wraps four side faces and one end face of each scintillator, only one end face is exposed to serve as a light emergent face, and the whole formed by the reflecting material and the scintillator array is rectangular.
3. The array type nuclear radiation detector based on the GAGG scintillator as claimed in claim 2, wherein: the reflecting material is BaSO4、TiO2ESR film, Teflon or MgO, the reflection efficiency of the reflecting material is more than or equal to 90 percent.
4. The array type nuclear radiation detector based on the GAGG scintillator as claimed in claim 1, wherein: the photoelectric conversion device is SiPM or MPPC.
5. The array type nuclear radiation detector based on the GAGG scintillator as claimed in claim 2, wherein: the whole rectangular body formed by the reflecting material and the scintillator array is fixedly bonded on the photoelectric conversion device array through high-transmittance optical cement, and the end face of each scintillator is bonded with the photoelectric conversion device in a one-to-one correspondence mode and used for transmitting all the scintillation light of the scintillator to an incidence window of the photoelectric conversion device as far as possible.
6. The array type nuclear radiation detector based on the GAGG scintillator as claimed in claim 1, wherein: the photon extraction efficiency of each scintillator pixel is more than or equal to 90 percent.
7. The GAGG scintillator based array nuclear radiation detector of claim 5, wherein: the refractive index of the optical cement is larger than or equal to 1.5, so that the total reflection angle of incident light is reduced.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112596096A (en) * | 2020-11-24 | 2021-04-02 | 中国科学院上海光学精密机械研究所 | Ultrafast gamma ray real-time detection device based on SiPM |
| CN113126138A (en) * | 2021-04-23 | 2021-07-16 | 重庆大学 | Method for manufacturing high-resolution scintillation screen with multilayer coupling structure and scintillation screen |
| CN115453606A (en) * | 2022-09-23 | 2022-12-09 | 西北核技术研究所 | Real-time measurement method and prediction method for radiation resistance of scintillator |
| WO2023097776A1 (en) * | 2021-12-01 | 2023-06-08 | 中国科学院深圳先进技术研究院 | Autoradiography system, and detector and imaging method thereof |
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2019
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112596096A (en) * | 2020-11-24 | 2021-04-02 | 中国科学院上海光学精密机械研究所 | Ultrafast gamma ray real-time detection device based on SiPM |
| CN113126138A (en) * | 2021-04-23 | 2021-07-16 | 重庆大学 | Method for manufacturing high-resolution scintillation screen with multilayer coupling structure and scintillation screen |
| CN113126138B (en) * | 2021-04-23 | 2022-11-11 | 重庆大学 | Method for manufacturing high-resolution scintillation screen with multilayer coupling structure and scintillation screen |
| WO2023097776A1 (en) * | 2021-12-01 | 2023-06-08 | 中国科学院深圳先进技术研究院 | Autoradiography system, and detector and imaging method thereof |
| CN115453606A (en) * | 2022-09-23 | 2022-12-09 | 西北核技术研究所 | Real-time measurement method and prediction method for radiation resistance of scintillator |
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