Scintillation ceramic, high-energy detection array, detector and preparation method

Abstract

The invention provides scintillation ceramic, a high-energy detection array, a detector and a preparation method. The chemical formula of the scintillation ceramic is Gd3Al2-x-yScxGa3O12: yCr < 3 + >. The preparation method comprises the following steps: S01, dissolving Gd2O3, Sc2O3, Ga2O3, NH4Al (SO4) 2.12 H2O and Cr (NO3) 3 in a hot acid solution, dropwise adding the acid solution into an alkali solution for coprecipitation, collecting a precipitate, and washing the precipitate; s02, drying and grinding the precipitate to obtain powder; s03, the powder is pre-sintered; s04, performing grinding, sieving, dry pressing and cold isostatic pressing treatment on the pre-sintered powder; and S05, carrying out primary sintering in an oxygen atmosphere, and carrying out isostatic pressing sintering in an inert atmosphere to obtain the compact ceramic. The garnet scintillation ceramic provided by the invention can realize high absorption intensity and luminous intensity of broadband, and shows good luminous performance and detection efficiency.

Description

Technical Field

[0001] The present invention relates to the field of detectors, and in particular to a gadolinium aluminum gallium garnet-based scintillation ceramic, a high-energy detection array, a detector and a preparation method thereof. Background Art

[0002] A scintillation detector is a device widely used for measuring ionizing radiation, and is particularly suitable for the detection of gamma rays and neutrons. The working principle of a scintillation detector is based on the flash phenomenon produced by radiation in certain substances (called scintillation materials). When radiation (such as gamma rays or neutrons) enters the scintillation material, it ionizes or excites the atoms or molecules of the scintillation material, and then generates photons (fluorescence) during the deexcitation process. These photons are collected as much as possible on the photocathode of the photomultiplier tube through light collecting components such as reflectors and light guides. On the photocathode, photons knock out photoelectrons through the photoelectric effect, and the photoelectrons are then multiplied step by step in the photomultiplier tube to eventually form an electrical pulse signal. This signal is recorded by the circuit and used for subsequent data processing and analysis.

[0003] The core part of the scintillation detector is the scintillation material. The scintillation material is a special energy converter that can convert high-energy rays (such as X-rays, gamma rays, etc.) or particles incident on it into ultraviolet light or visible light. This conversion process depends on the electronic structure inside the material. When high-energy rays interact with the material, they will excite the electrons inside the material to transition to a high-energy state. Subsequently, the electrons release photons during the deexcitation process to form scintillation light. The scintillation material can be solid, liquid or gas, among which solid scintillation materials are the most common. Gadolinium aluminum gallium garnet (Gd3Ga2Al3O 12 GAGG (GAGG for short) is a new type of oxide scintillator with many excellent properties. It has broad application prospects in many fields, such as computed tomography (CT), positron emission tomography (PET) and single photon emission computerized tomography (SPECT), as well as high-energy particle detection in high-energy physics and nuclear physics. However, GAGG scintillating ceramics have poor luminescence uniformity and a narrow emission range, resulting in the need to improve their luminescence performance and detection efficiency. Summary of the invention

[0004] In order to solve the above problems of the prior art, the present invention provides a scintillation ceramic, a high energy detection array, a detector and a preparation method, which can improve the luminescence performance of GAGG-based scintillation ceramics and the detection efficiency of the high energy detection array.

[0005] The present invention is achieved through the following technical solutions:

[0006] The present invention provides a scintillation ceramic, the chemical formula of which is Gd3Al 2-x-y Sc x Ga3O 12:yCr 3+ , where x=0.01-0.05, y=0.01-0.08.

[0007] Preferably, in the scintillation ceramic of the present invention, x=0.01-0.04, y=0.01-0.05.

[0008] The present invention provides a method for preparing the scintillation ceramic, comprising the following steps:

[0009] S01, Gd2O3, Sc2O3, Ga2O3, NH4Al(SO4)2·12H2O and Cr(NO3)3 were mixed according to Gd3Al 2-x-y Sc x Ga3O 12 :yCr 3+ The stoichiometric ratio of the two is dissolved in a hot acid solution, and then the acid solution is dropped into an alkaline solution for co-precipitation to precipitate a precipitate; the precipitate is collected and washed;

[0010] S02, drying and grinding the washed precipitate to obtain a powder;

[0011] S03, pre-calcining the obtained powder;

[0012] S04, grinding and sieving the pre-sintered powder, and then sequentially performing dry pressing and cold isostatic pressing;

[0013] S05, the sample after cold isostatic pressing was sintered once in an oxygen atmosphere at 1600-1650 °C, and then isostatically pressed in an inert atmosphere to form a dense ceramic.

[0014] Preferably, in the method for preparing the scintillating ceramics of the present invention, in S01, the alkaline solution is a mixed alkaline solution of NH4HCO3 and NH3·H2O.

[0015] Preferably, in the method for preparing the scintillation ceramics of the present invention, in S03, the pre-firing temperature is 800-900° C., and the holding time is 1-3 h.

[0016] Preferably, in the method for preparing the scintillating ceramics of the present invention, in S04, the pressure used in the cold isostatic pressing is 150-250 MPa.

[0017] Preferably, in the method for preparing the scintillating ceramics of the present invention, in S05, the pressure used for the isostatic pressing sintering is 180-200 MPa.

[0018] The present invention also provides a high energy detection array, wherein the material of the high energy detection array is the scintillation ceramic as described above.

[0019] The method for preparing the high energy detection array of the present invention comprises the following steps:

[0020] S12, annealing the scintillating ceramic according to any one of claims 1 to 2 at a temperature of 1000-1200° C. in air;

[0021] S13, parallel polishing, cutting and grinding of the annealed samples into high-energy detection arrays.

[0022] The present invention also provides a detector based on the above-mentioned high-energy detection array, including the above-mentioned high-energy detection array.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] The present invention provides a chromium ion (Cr 3+ ) and scandium ions (Sc 3+ ) co-doped gadolinium aluminum gallium garnet scintillation ceramics, the doping of chromium ions can regulate the luminescence performance from the absorption cross section of the electron transition orbit, and the doping of scandium ions can move the position of the scintillation ceramic emission peak toward the infrared light direction, thereby expanding the emission range. Therefore, the garnet scintillation ceramics of the present invention can achieve high absorption intensity and luminescence intensity in a wide band, showing good luminescence performance and detection efficiency.

[0025] The powder prepared by the chemical precipitation method in the present invention has good dispersibility and uniform particle size. The cold isostatic pressing process can apply equal pressure in all directions to the sample. Combined with the two-step sintering method, the sample can be sintered more densely, thereby improving the optical transmittance and scintillation light output and other properties.

[0026] The present invention utilizes the above-mentioned scintillation ceramics to prepare a high-energy detection array, and then assembles a scintillation detector to convert high-energy rays (X-rays / γ-rays) into ultraviolet light or visible light, and realizes the conversion of photoelectric signals through photomultiplier tubes, and finally displays the information of the detected material in the form of a digital signal, which can be applied to medical treatment, national defense, security inspection and other application fields. DETAILED DESCRIPTION

[0027] The following describes the embodiments of the present invention through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention.

[0028] It should be noted that the process equipment or devices not specifically specified in the following embodiments are all conventional equipment or devices in the art.

[0029] In addition, it should be understood that one or more method steps mentioned in the present invention do not exclude the existence of other method steps before or after the combination step or the insertion of other method steps between these explicitly mentioned steps, unless otherwise specified; it should also be understood that the combination connection relationship between one or more devices / apparatuses mentioned in the present invention does not exclude the existence of other devices / apparatuses before or after the combination device / apparatus or the insertion of other devices / apparatuses between these explicitly mentioned two devices / apparatuses, unless otherwise specified. Moreover, unless otherwise specified, the numbering of each method step is only a convenient tool for identifying each method step, and is not intended to limit the order of arrangement of each method step or the scope of the present invention. Changes or adjustments in their relative relationships should also be regarded as the scope of the present invention without substantially changing the technical content.

[0030] In order to enhance the scintillation performance of gadolinium aluminum gallium garnet scintillation ceramics, the present invention performs doping modification from two aspects of the absorption cross section of the electron transition orbit and the width of the emission peak, regulates the luminescence uniformity and wide emission range of the GAGG scintillation ceramics, and optimizes the luminescence performance and wide detection efficiency.

[0031] For this purpose, based on gadolinium aluminum gallium garnet scintillation ceramics, the present invention provides a kind of 12 The dopant ions chromium (Cr 3+ ) and scandium ions (Sc 3+ ) of garnet scintillating ceramics, wherein A is a gadolinium (Gd) element among rare earth elements, B is an aluminum (Al) element and a doped chromium (Cr) element and a scandium (Sc) element, and C is a gallium (Ga) element. The garnet scintillating ceramics are doped with x=0.01-0.05 mol% of Sc 3+ , doped with y = 0.01-0.08 mol% Cr 3+ .

[0032] That is, the scintillating ceramic provided by the present invention has a chemical formula of Gd3Al 2-x-y Sc x Ga3O 12 :yCr 3+ , wherein x=0.01-0.05, y=0.01-0.08, more preferably x=0.01-0.04, y=0.01-0.05.

[0033] In the garnet scintillating ceramic of the present invention, the doping of chromium ions can regulate the luminescence performance from the absorption cross section of the electron transition orbit, and the doping of scandium ions can move the position of the scintillating ceramic emission peak toward the infrared light direction, thereby expanding the emission range. Therefore, the garnet scintillating ceramic of the present invention can achieve high absorption intensity and luminescence intensity in a wide band, showing good luminescence performance and detection efficiency.

[0034] The garnet scintillation ceramic of the present invention is prepared by a chemical coprecipitation method and a two-step sintering method. Specifically, the preparation method comprises the following steps:

[0035] S01, chemical coprecipitation method: Gd2O3, Sc2O3, Ga2O3, NH4Al(SO4)2·12H2O and Cr(NO3)3 were mixed according to Gd3Al 2-x-y Sc x Ga3O 12 :yCr 3+ The stoichiometric ratio of (x=0.01-0.05, y=0.01-0.08) is dissolved in a hot acid solution, and then the acid solution is dripped into an alkaline solution containing NH4HCO3 and NH3·H2O through a peristaltic pump to precipitate a precipitate; the precipitate is collected and washed.

[0036] S02, drying and grinding: drying and grinding the washed precipitate to obtain powder:

[0037] S03, pre-sintering: pre-sintering the obtained powder, that is, pre-synthesizing the ceramic.

[0038] S04, cold isostatic pressing: the pre-sintered powder is ground, crushed, sieved, dry pressed first, and then cold isostatic pressed. The pressure used for cold isostatic pressing is 150-250MPa.

[0039] S05, two-step sintering method: the sample after cold isostatic pressing is sintered once in an oxygen atmosphere at 1600-1650°C, and then isostatically pressed in an argon atmosphere to form a dense ceramic. The pressure used for isostatic pressing is 180-200MPa.

[0040] The coprecipitation method refers to adding an appropriate precipitant to a solution containing two or more cations, and precipitating these cations simultaneously through chemical reactions to form a uniform precipitate. This method utilizes the interaction between the components during the precipitation process, so that multiple components can be evenly mixed and precipitated together. The coprecipitation method can directly obtain nanopowder materials with uniform chemical composition through chemical reactions in the solution, avoiding the inhomogeneity in the subsequent mixing process. This method can easily prepare nanopowder materials with small particle size and uniform distribution, which is of great significance for improving the performance and application effect of the material. The operation of the coprecipitation method is relatively simple, does not require complex equipment and process conditions, and is suitable for large-scale production. Due to the simple process and high raw material utilization rate, the production cost of the coprecipitation method is relatively low.

[0041] Cold isostatic pressing technology is to form powder materials at room temperature using rubber or plastic as the sheath mold material and liquid as the pressure medium. Its working principle is based on Pascal's law, that is, the pressure of the medium (liquid or gas) in a closed container can be transmitted equally in all directions. Therefore, when the liquid medium is injected into the pressure vessel through a pressure pump, the pressure on the powder in all directions is uniform and consistent, thereby achieving isostatic pressing. The products formed by cold isostatic pressing have a high density. Cold isostatic pressing technology can form products with complex shapes and near-net shapes, and the aspect ratio is not restricted, which is conducive to the production of thin and long rod-shaped and tubular products. The isostatic pressing process generally does not require the addition of lubricants to the powder, which not only reduces the pollution of the product, but also simplifies the manufacturing process.

[0042] The powder prepared by the chemical precipitation method in the present invention has good dispersibility and uniform particle size. The cold isostatic pressing process can apply equal pressure in all directions to the sample. Combined with the two-step sintering method, the sample can be sintered more densely, thereby improving the optical transmittance and scintillation light output and other properties.

[0043] In some specific embodiments of the present invention, in S02, the pre-firing temperature is 800-900° C. and the time is 1-3 hours.

[0044] Based on the above garnet scintillation ceramic, the present invention provides a high energy detection array, wherein the high energy detection array uses the above garnet scintillation ceramic as the scintillation material, and has good key scintillation properties such as light output, afterglow, and strongest emission peak.

[0045] The method for preparing the high energy detection array of the present invention comprises the following steps:

[0046] S11, annealing: the garnet scintillation ceramic is kept at a temperature of 1000-1200°C in air for 15-25h.

[0047] S12, cutting and grinding: the annealed garnet scintillating ceramic is parallel polished and cut and ground into a high-energy detection array that meets the back-end requirements.

[0048] The present invention performs annealing treatment on the garnet scintillation ceramics, and a thinner oxide layer is formed on the surface of the ceramics during annealing, thereby reducing the oxidation rate of the ceramics during use, thereby increasing the service life of the high-energy detection array.

[0049] The present invention does not impose any particular limitation on the cutting method, which may be diamond wire cutting, laser cutting, water jet cutting, etc.

[0050] The grinding process of the present invention is mainly used to remove burrs generated during the cutting process, improve surface finish and flatness, and achieve specific shape and size accuracy.

[0051] During the cutting and grinding process, online detection technology is needed to monitor the workpiece in real time to ensure processing accuracy and quality. Common online detection technologies include laser measurement and machine vision.

[0052] Example 1

[0053] The chemical formula of the garnet scintillating ceramic in this embodiment is Gd3Al 1.96 Sc 0.01 Ga3O 12 :0.01Cr 3+ , and its preparation method comprises the following steps:

[0054] S01, chemical coprecipitation method: First, Gd2O3(4N), Sc2O3(4N), Ga2O3(5N), NH4Al(SO4)2·12H2O(AR) and Cr(NO3)3(AR) were prepared by Gd3Al 1.96 Sc 0.01 Ga3O 12 :0.01Cr 3+ The stoichiometric ratio of the AR was dissolved in a hot acid solution, and then the acid solution was dripped into an alkaline solution containing NH4HCO3(AR) and NH3·H2O(AR) by a peristaltic pump; the precipitate was filtered and washed with deionized water to remove excess soluble ions.

[0055] S02, dry grinding: dry the precipitate by microwave drying, and crush it into powder by agate mortar through a 200-mesh sieve.

[0056] S03, pre-sintering: the ground powder is calcined in a muffle furnace at 850°C for 2h, thus pre-synthesizing the ceramic.

[0057] S04, cold isostatic pressing: the pre-sintered powder is ground and crushed, passed through a 60-mesh sieve, dry pressed in a mold with a diameter of 20 mm, and then cold isostatic pressed at a pressure of 200 MPa.

[0058] S05, two-step sintering method: the sample after cold isostatic pressing was sintered at 1600℃ in oxygen atmosphere for 2h, and finally sintered in argon atmosphere by isostatic pressing at 190MPa to make dense ceramics. The obtained ceramics were double-sided polished into ceramic specimens with a diameter of 12mm and a thickness of about 3mm.

[0059] Example 2

[0060] The chemical formula of the garnet scintillating ceramic in this embodiment is Gd3Al 1.96 Sc 0.02 Ga3O 12 :0.03Cr 3+ , and its preparation method comprises the following steps:

[0061] S01, chemical coprecipitation method: First, Gd2O3(4N), Sc2O3(4N), Ga2O3(5N), NH4Al(SO4)2·12H2O(AR) and Cr(NO3)3(AR) were prepared by Gd3Al 1.96 Sc 0.02 Ga3O 12 :0.03Cr 3+ The stoichiometric ratio of the AR was dissolved in a hot acid solution, and then the acid solution was dripped into an alkaline solution containing NH4HCO3(AR) and NH3·H2O(AR) by a peristaltic pump; the precipitate was filtered and washed with deionized water to remove excess soluble ions.

[0062] S02, dry grinding: dry the precipitate by microwave drying, and crush it into powder by agate mortar through a 200-mesh sieve.

[0063] S03, pre-sintering: the ground powder is calcined in a muffle furnace at 850°C for 2h, thus pre-synthesizing the ceramic.

[0064] S04, cold isostatic pressing: the pre-sintered powder is ground and crushed, passed through a 60-mesh sieve, dry pressed in a mold with a diameter of 20 mm, and then cold isostatic pressed at a pressure of 200 MPa.

[0065] S05, two-step sintering method: the sample after cold isostatic pressing was sintered at 1600℃ in oxygen atmosphere for 2h, and finally sintered in argon atmosphere by isostatic pressing at 190MPa to make dense ceramics. The obtained ceramics were double-sided polished into ceramic specimens with a diameter of 12mm and a thickness of about 3mm.

[0066] Example 3

[0067] The chemical formula of the garnet scintillating ceramic in this embodiment is Gd3Al 1.96 Sc 0.02 Ga3O 12 :0.05Cr 3+ , and its preparation method comprises the following steps:

[0068] S01, chemical coprecipitation method: First, Gd2O3(4N), Sc2O3(4N), Ga2O3(5N), NH4Al(SO4)2·12H2O(AR) and Cr(NO3)3(AR) were prepared by Gd3Al 1.96 Sc 0.02 Ga3O 12 :0.05Cr 3+ The stoichiometric ratio of the AR was dissolved in a hot acid solution, and then the acid solution was dripped into an alkaline solution containing NH4HCO3(AR) and NH3·H2O(AR) by a peristaltic pump; the precipitate was filtered and washed with deionized water to remove excess soluble ions.

[0069] S02, dry grinding: dry the precipitate by microwave drying, and crush it into powder by agate mortar through a 200-mesh sieve.

[0070] S03, pre-sintering: the ground powder is calcined in a muffle furnace at 850°C for 2h, thus pre-synthesizing the ceramic.

[0071] S04, cold isostatic pressing: the pre-sintered powder is ground and crushed, passed through a 60-mesh sieve, dry pressed in a mold with a diameter of 20 mm, and then cold isostatic pressed at a pressure of 200 MPa.

[0072] S05, two-step sintering method: the sample after cold isostatic pressing was sintered at 1600℃ in oxygen atmosphere for 2h, and finally sintered in argon atmosphere by isostatic pressing at 190MPa to make dense ceramics. The obtained ceramics were double-sided polished into ceramic specimens with a diameter of 12mm and a thickness of about 3mm.

[0073] Example 4

[0074] The chemical formula of the garnet scintillating ceramic in this embodiment is Gd3Al 1.96 Sc 0.04 Ga3O 12 :0.03Cr 3+ , and its preparation method comprises the following steps:

[0075] S01, chemical coprecipitation method: First, Gd2O3(4N), Sc2O3(4N), Ga2O3(5N), NH4Al(SO4)2·12H2O(AR) and Cr(NO3)3(AR) were prepared by Gd3Al 1.96 Sc 0.04 Ga3O 12 :0.03Cr 3+ The stoichiometric ratio of the AR was dissolved in a hot acid solution, and then the acid solution was dripped into an alkaline solution containing NH4HCO3(AR) and NH3·H2O(AR) by a peristaltic pump; the precipitate was filtered and washed with deionized water to remove excess soluble ions.

[0076] S02, dry grinding: dry the precipitate by microwave drying, and crush it into powder by agate mortar through a 200-mesh sieve.

[0077] S03, pre-sintering: the ground powder is calcined in a muffle furnace at 850°C for 2h, thus pre-synthesizing the ceramic.

[0078] S04, cold isostatic pressing: the pre-sintered powder is ground and crushed, passed through a 60-mesh sieve, dry pressed in a mold with a diameter of 20 mm, and then cold isostatic pressed at a pressure of 200 MPa.

[0079] S05, two-step sintering method: the sample after cold isostatic pressing was sintered at 1600℃ in oxygen atmosphere for 2h, and finally sintered in argon atmosphere by isostatic pressing at 190MPa to make dense ceramics. The obtained ceramics were double-sided polished into ceramic specimens with a diameter of 12mm and a thickness of about 3mm.

[0080] Example 5

[0081] The chemical formula of the garnet scintillating ceramic in this embodiment is Gd3Al 1.96 Sc 0.04 Ga3O 12 :0.05Cr 3+ , and its preparation method comprises the following steps:

[0082] S01, chemical coprecipitation method: First, Gd2O3(4N), Sc2O3(4N), Ga2O3(5N), NH4Al(SO4)2·12H2O(AR) and Cr(NO3)3(AR) were prepared by Gd3Al 1.96 Sc 0.04 Ga3O 12 :0.05Cr 3+ The stoichiometric ratio of the AR was dissolved in a hot acid solution, and then the acid solution was dripped into an alkaline solution containing NH4HCO3(AR) and NH3·H2O(AR) by a peristaltic pump; the precipitate was filtered and washed with deionized water to remove excess soluble ions.

[0083] S02, dry grinding: dry the precipitate by microwave drying, and crush it into powder by agate mortar through a 200-mesh sieve.

[0084] S03, pre-sintering: the ground powder is calcined in a muffle furnace at 850°C for 2h, thus pre-synthesizing the ceramic.

[0085] S04, cold isostatic pressing: the pre-sintered powder is ground and crushed, passed through a 60-mesh sieve, dry pressed in a mold with a diameter of 20 mm, and then cold isostatic pressed at a pressure of 200 MPa.

[0086] S05, two-step sintering method: the sample after cold isostatic pressing was sintered at 1600℃ in oxygen atmosphere for 2h, and finally sintered in argon atmosphere by isostatic pressing at 190MPa to make dense ceramics. The obtained ceramics were double-sided polished into ceramic specimens with a diameter of 12mm and a thickness of about 3mm.

[0087] Example 6

[0088] The method for preparing the high energy detection array of the present invention comprises the following steps:

[0089] S11, annealing: the garnet scintillation ceramics in Examples 1-5 are kept in air at a temperature of 1100° C. for 20 h;

[0090] S12, cutting and grinding: the annealed garnet scintillating ceramic is parallel polished and cut and ground into a high-energy detection array that meets the back-end requirements.

[0091] The scintillating ceramics prepared in Examples 1, 2, 3, 4, and 5 of the present invention all have a pure garnet structure without a second phase, and are co-doped with Cr. 3+ and Sc 3+ Gadolinium aluminum gallium garnet (GAGG:Cr 3+ )Scintillating ceramics form a complete solid solution and maintain good optical transparency.

[0092] The present invention carries out Sc in gadolinium aluminum gallium garnet 3+ Doping can move the emission peak toward the infrared direction and expand the emission range, but the luminous intensity is reduced. 3+ The doping of Cr can control the luminescence properties from the absorption cross section of the electron transition orbit, but excessive Cr 3+ Doping will lead to energy quenching and significantly reduce the luminescence intensity, so the amount of addition is controlled to be 0.01-0.08 mole percent. 3+ and Cr 3+ When the co-doping stoichiometric ratio is moderate, the absorption intensity in a wide luminescence band will be significantly increased, the luminescence performance will be good, and good photoelectric conversion efficiency and stability will be maintained.

[0093] The embodiments of the present disclosure have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The selection of terms used herein is intended to best explain the principles of the embodiments, practical applications, or technical improvements to the technology in the market, or to enable other persons of ordinary skill in the art to understand the embodiments disclosed herein.

Claims

1. A scintillating ceramic, characterized in that: The chemical formula of the scintillating ceramic is Gd3Al 2-x-y Sc x Ga3O 12 :yCr 3+ , where x=0.01-0.05, y=0.01-0.

08.

2. The scintillating ceramic according to claim 1, characterized in that x=0.01-0.04, y=0.01-0.

05.

3. The method for preparing the scintillating ceramic according to any one of claims 1 to 2, characterized in that: The following steps are involved: S01, Gd2O3, Sc2O3, Ga2O3, NH4Al(SO4)2·12H2O and Cr(NO3)3 were mixed according to Gd3Al 2-x-y Sc x Ga3O 12 :yCr 3+ The stoichiometric ratio of the two is dissolved in a hot acid solution, and then the acid solution is dropped into an alkaline solution for co-precipitation to precipitate a precipitate; the precipitate is collected and washed; S02, drying and grinding the washed precipitate to obtain a powder; S03, pre-calcining the obtained powder; S04, grinding and sieving the pre-sintered powder, and then sequentially performing dry pressing and cold isostatic pressing; S05, the sample after cold isostatic pressing was sintered once in an oxygen atmosphere at 1600-1650 °C, and then isostatically pressed in an inert atmosphere to form a dense ceramic.

4. The method for preparing scintillating ceramics according to claim 3, characterized in that: In S01, the alkaline solution is a mixed alkaline solution of NH4HCO3 and NH3·H2O.

5. The method for preparing scintillating ceramics according to claim 3, characterized in that: In S03, the pre-burning temperature is 800-900°C, and the holding time is 1-3h.

6. The method for preparing scintillating ceramics according to claim 3, characterized in that: In S04, the pressure used in the cold isostatic pressing is 150-250 MPa.

7. The method for preparing scintillating ceramics according to claim 3, characterized in that: In S05, the pressure used for the isostatic pressing sintering is 180-200 MPa.

8. A high energy detection array, characterized in that: The material of the high energy detection array is the scintillation ceramic described in any one of claims 1-2.

9. The method for preparing the high energy detection array according to claim 6, characterized in that: The following steps are involved: S12, annealing the scintillating ceramic according to any one of claims 1 to 2 at a temperature of 1000-1200° C. in air; S13, parallel polishing, cutting and grinding of the annealed samples into high-energy detection arrays.

10. A detector, characterized in that: Comprising the high energy detection array as described in claim 8.