24 results about "Scintillation crystals" patented technology

This utility model relates to the field of polishing device technology, and in particular to a polishing device for scintillation crystal surface. It includes a polishing frame for polishing a pressure-bearing scintillation crystal, a flexible clamping module located at the top corners of the polishing frame to flexibly hold the scintillation crystal, a circulation tank for circulating and filtering coolant connected to the bottom of the polishing frame, and polishing processing components for polishing the scintillation crystal surface corresponding to the polishing frame. The flexible clamping module uses flexible clamping blocks with floating blocks, and the clamping force is dynamically adjusted by internal magnetic blocks and electromagnets. Combined with spring rubber dampers to absorb vibration, it avoids edge chipping caused by stress concentration at the crystal edge. The bottom of the polishing sleeve is designed as a curved panel, forming a gradual contact with the crystal surface to reduce sudden changes in edge pressure. A filter plate inside the polishing frame pre-filters debris, and a filter column in the circulation tank further purifies the coolant.

This disclosure provides a gamma camera with a collimation unit, applicable to the field of detection technology. The gamma camera includes at least one detection unit, comprising: a collimation unit comprising multiple needle-type collimator arrays arranged alternately, each needle-type collimator array comprising multiple arrayed needle-type collimators whose length directions point in the same direction, with the length directions of the needle-type collimators in different arrays pointing in different directions; multiple scintillation crystal units for detecting gamma photons penetrating the collimation unit along different directions, generating multiple sets of scintillation light signals; and multiple photoelectric conversion units, each coupled to a scintillation crystal unit, for converting the multiple sets of scintillation light signals into multiple sets of electrical signals for imaging by the gamma camera.

The invention discloses a crucible descent growth method of a large-size bibenzyl scintillation crystal, and relates to a growth method of a bibenzyl scintillation crystal. The method aims at solving the technical problem that the quality of crystals obtained through an existing bibenzyl single crystal solution growth method is poor, a bibenzyl raw material is sealed in a quartz crucible of a capillary structure, the raw material is melted and a stable solid-liquid interface is formed by precisely controlling the temperature field of a furnace body and the descending rate of the crucible, and the bibenzyl single crystal is obtained. And then enabling the crucible to pass through a temperature gradient region at a constant rate to realize directional solidification growth of the bibenzyl single crystal, and then carrying out cooling annealing treatment. The diameter of the prepared bibenzyl scintillation crystal is 25 mm, the length of an equal-diameter section reaches 80 mm, the light-induced decay time of the bibenzyl scintillation crystal is 2.7 ns, the light yield and the decay time of the bibenzyl scintillation crystal under the excitation of a 137 Cs radioactive source are 21600 ph / Mev and 3.71 ns respectively, and the bibenzyl scintillation crystal can be used in the field of ray detection and imaging devices.

The application provides a digital detector, device, system, method, equipment and computer storage medium, the digital detector comprises a scintillation crystal, a collimator and a photoelectric conversion device, the scintillation crystal is a sheet-shaped continuous scintillation crystal and is configured to convert rays into visible light; the collimator is configured to be matched with the scintillation crystal in a sheet shape, and is configured to collimate the visible light converted by the scintillation crystal; the collimator makes the visible light pass through at a preset angle through microchannels; and the photoelectric conversion device is coupled with the collimator and converts the collimated visible light into a flicker pulse signal. The technical scheme of the application can further reduce the size of the photoelectric conversion device, reduce optical crosstalk, and be beneficial to improving the imaging spatial resolution.

A crucible-descent growth method for ultrafast scintillation crystals of trans-stilbene is disclosed, relating to melt growth methods for organic single crystals. This method aims to address the technical problems of compositional deviation and difficulty in controlling crystal quality and size in existing solution-grown trans-stilbene single crystals. The method first purifies the raw material using solution recrystallization, then seals the recrystallized trans-stilbene in a crucible. By precisely controlling the furnace temperature field and the crucible descent rate, a stable vertical temperature gradient is formed, achieving directional solidification growth of the crystal. The trans-stilbene scintillation crystals prepared by this method have a diameter of 25 mm and a constant-diameter section length of 60 mm, exhibiting excellent optical quality and a photo-induced decay time of 4.49 ns. 137 The light yield under Cs radiation source excitation reaches 21000 ph / MeV, with a decay time of 3.81 ns, making it suitable for radiation detection.

The present application relates to a kind of flat panel detector, belong to flat panel detector technical field, including scintillation crystal, two opposite sides of scintillation crystal are coupled with photoelectric detector, one photoelectric detector is aligned with scintillation crystal setting, another photoelectric detector is misaligned with scintillation crystal setting, the structure of 2 photoelectric detectors is same, the present application can solve the technical problems of existing technology limited to pixel size, cannot significantly improve the inherent resolution of flat panel detector.

The present application relates to the field of sodium iodide crystal cutting, and particularly relates to a processing method of large-size sodium iodide scintillation crystal for nuclear radiation detection, comprising: determining an initial cutting point based on a required capacity length; before cutting processing is performed on the single initial cutting point, determining whether to adjust the position of the initial cutting point to obtain an execution cutting point based on a defect cracking index corresponding to the initial cutting point; based on a defect feature interference condition corresponding to a to-be-cut surface of the execution cutting point, determining whether to adjust a cutting speed setting mode from a self-adjusting speed cutting to a minimum speed cutting; and cutting is completed to obtain a target sub-crystal. The present application improves the cutting flexibility and cutting precision of the large-size sodium iodide crystal.

This utility model discloses a lightweight scintillator detector based on an array-type SiPM, including an iron end cap, a base plate, an iron outer shell, and a back plate; the iron end cap is connected to the front opening of the iron outer shell, and the rear opening of the iron outer shell is connected to the back plate; the bottom opening of the iron outer shell is connected to the base plate; the front end of the iron outer shell is provided with a first nylon anechoic chamber, an encapsulated CLYC scintillation crystal, a second nylon anechoic chamber, a SiPM sensor array, and a ceramic circuit board; the rear end of the iron outer shell is provided with an aluminum bracket, and each data acquisition board and each signal sampling board are fixed to the base plate through the aluminum bracket; the encapsulated CLYC scintillation crystal is located in the first nylon anechoic chamber, the SiPM sensor array is fixed on the ceramic circuit board, and the ceramic circuit board is fixed to the rear end of the second nylon anechoic chamber; the connectors on the ceramic circuit board are interconnected with the signal sampling board through a rigid-flexible bonding plate; the ceramic circuit board and the first and second nylon anechoic chambers constitute a primary anechoic chamber, and a secondary anechoic chamber is provided outside the primary anechoic chamber.

This invention relates to the field of CT detector technology, and particularly to a high spatial resolution, high-energy industrial CT linear array detector and its manufacturing method. The detector includes: a scintillation crystal linear array, a first photodiode array, and a second photodiode array; X-rays are incident from the side of the scintillation crystal linear array, and the scintillation light generated by the scintillation crystal linear array is emitted from the upper and second end faces to the first and second photodiode arrays, respectively. This invention proposes a "two-end readout + intermittent light emission" coupling scheme between the scintillation crystal array and photodiodes, achieving spatial resolution improvement through physical means, breaking through the resolution bottleneck of existing detectors, while ensuring high detection efficiency and high signal-to-noise ratio. The aim is to utilize existing standard pixel-sized photodiode arrays, through innovative structural design of the scintillation crystal linear array, to achieve a spatial resolution more than twice that of the physical pixel size.

Systems and methods for a time of flight (TOF) positron emission tomography (PET) system is herein provided. In one example, an imaging system comprises one or more detector blocks, each detector block including an array of silicon photomultiplier (SiPM) devices coupled to an array of scintillation crystals with a one-to-one coupling arrangement, wherein each SiPM device of the array of SiPM devices transmits signals to independent front-end readout circuits of one or more analog application-specific integrated circuits (ASICs). The front-end readout circuits are configured to detect individual scintillating photons and suppress SiPM dark counts.

This utility model relates to the field of scintillation crystal technology, and more particularly to a multi-faceted grinding device for scintillation crystals. It includes a base, a bottom plate mounted at the center of the upper surface of the base, a fixing plate mounted on the upper surface of the bottom plate, a large gear rotatably connected to the upper surface of the fixing plate, a stepping motor mounted inside the bottom plate near its edge, and a small gear meshing with the large gear at the output end of the stepping motor. A mounting frame is fixedly connected to the upper surface of the large gear to drive the clamping structure to rotate along the grinding structure, thereby performing multi-faceted grinding of the scintillation crystal. This utility model achieves continuous grinding of multiple surfaces of the crystal in a single clamping process through a ring-shaped grinding frame and rotating platform, avoiding the cumbersome steps of frequently changing angles or re-clamping in traditional equipment.

The application provides an inorganic scintillation crystal performance test system and method based on an adjustable pinhole collimator, and solves the problem that existing inorganic scintillation crystal performance test systems are mostly limited to the research of specific crystals and radioactive sources and are not universal in radiation detection macroscopic applications. The system comprises a base, a radioactive source, a radioactive source limiting unit, a collimation assembly, a collimation adjusting unit, a detector position adjusting unit and a rear-end test unit. Through the use of the system core structure, the collimation assembly composed of multiple pinhole collimators, the radioactive source radiation is accurately injected into the scintillation crystal at a certain angle, reducing the interference caused by scattering and environmental background, and combining standard scintillation crystals and standard radioactive sources of the same kind, the activity and energy consistency of the radioactive source is calibrated with high precision and sensitivity, and then flexible matching of various types of radioactive sources is realized, and the objective conditions of the numerous radiation isotopes in the application environment are restored as much as possible.

This invention relates to the field of organic functional crystal growth technology, specifically a method for growing organic crystals based on the control of the included angle of the inner wall of a crucible. The method employs a quartz crucible with an axisymmetric conical inner cavity, and controls the included angle β of the inner wall of the crucible to be 10°–30°, preferably 15°–20°. After loading the organic crystal raw material into the crucible, a vacuum of 1×10⁻⁶ is applied. ‑2 After being sealed by welding, and after passing the pre-growth inspection and sealing, the melt is placed in a Bridgman crystal growth furnace for heating and melting and held at that temperature for 24 hours. The axial temperature gradient is controlled, and the melt is directionally solidified and grown from bottom to top at a rate of 1-1.5 mm / h. The organic single crystal is then slowly cooled to obtain the organic single crystal. This invention optimizes the melt flow field and solid-liquid interface by adjusting the crucible angle, reduces the radial temperature gradient, reduces defects such as crystal cracks and dislocations, and improves crystal integrity and optical uniformity. The process is simple, has good repeatability, and is suitable for large-size, high-quality growth of organic scintillation crystals and organic optoelectronic crystals.

This invention discloses an irradiation device and a method for testing the performance of radiation detectors and scintillation crystals. The irradiation device includes a housing with several horizontally arranged partitions inside, spaced vertically to divide the housing into several chambers. Each chamber contains an irradiation unit. Each irradiation unit includes a rotating mechanism with a placement slot for placing a radiation source. The rotating mechanism is horizontally rotatable. An operating port is provided on one side wall of the housing, allowing the placement slot to extend out of the housing after the rotating mechanism rotates at a certain angle, facilitating the replacement of the radiation source within the placement slot. The bottom plate of the housing and all partitions have collimation holes corresponding to the placement slots, ensuring that the placement slots are positioned directly above the collimation holes after the rotating mechanism rotates, and all collimation holes are aligned on the same straight line. This invention can be used for scintillation crystal performance testing, radiation detector calibration, and scaling experiments, and can effectively reduce radiation damage to workers.

This invention relates to a ternary co-doped LaBr3 scintillation crystal for neutron detection and its preparation method. The chemical composition of the ternary co-doped LaBr3 scintillation crystal for neutron detection is A. x B y Ce z La 1‑x‑y‑ z Br 3‑2x‑y Wherein: A is a +1 valent alkali metal ion, preferably Li, 6 One of the following ions: Li, Na, K, Rb, and Cs, more preferably... 6 Li; B is a +2 valent alkaline earth metal ion, preferably one of Mg, Ca, Sr, and Ba ions, more preferably Sr; 0.00001≤x≤0.0025, 0.001≤y≤0.005, 0.03≤z≤0.08, preferably x=0.00005, y=0.003, z=0.05.

A radiation detector configured to detect, analyze and measure a broad spectrum of ionizing radiation energies includes a housing having a hollow interior, a display opening and one or more secondary openings, and a processing board enclosed within the interior of the housing. The processing board includes a scintillation detector having a cube-shaped scintillation crystal and a flexible PCB. A first end of the flexible PCB includes a solid-state silicon photomultiplier that is optically connected to the scintillation crystal and a second end of the flexible PCB is communicatively connected to the processing board. The processing board further includes a microprocessor configured to process electrical pulses received from the silicon photomultiplier, a display having a display flexible PCB communicatively connected to the processing board and one or more operating buttons for selectively operating the radiation detector.

A gamma-ray measurement tool includes a tubular housing, a gamma-ray detector disposed within the tubular housing, and a shielding layer disposed between the tubular housing and the gamma-ray detector. The gamma-ray detector includes a scintillation crystal coupled to a photomultiplier tube, and the shielding layer has an open window that allows gamma rays to pass through and reach the scintillation crystal. Furthermore, the tubular housing has a first axis in a longitudinal direction, and the gamma-ray detector has a second axis in the longitudinal direction; the first and second axes are not coincident, and the distance between the scintillation crystal and the inner surface of the tubular housing via the window is shorter than the distance between the scintillation crystal and the portion of the tubular housing covered by the shielding layer.

This invention belongs to the field of radiation detector technology and relates to an array detector for coded spectral dispersion and a method for acquiring response depth information. The array detector includes: a scintillator array composed of multiple microprobes, with a light-reflecting layer disposed between adjacent pixel scintillators; a photoelectric channel array optically coupled to the scintillator array for converting detected scintillating light into electrical signals; and a light guide block array optically coupled to the first end face of the scintillator array, with adjacent light guide channels separated by a light-reflecting layer. The light guide block array is used to partially distribute light emitted from one pixel scintillator and entering the corresponding light guide channel to an adjacent pixel scintillator crystal, so that the light signal generated by the same scintillating event can be received by at least two photoelectric devices. Its advantages include high energy measurement accuracy and accurate timing, high linearity of DOI correlation, and more accurate measurement.

The application belongs to the technical field of optoelectronic material preparation and application, and particularly relates to preparation of large-size metal cation doped Rb2CuBr3 scintillation crystal and application thereof in X-ray radiation detection.Under the protection of inert gas, rubidium bromide, cuprous bromide and a doping reagent are weighed according to a proportion, added into a mixed solvent of hydrobromic acid aqueous solution and deionized water, and then hypophosphorous acid is added as an antioxidant, and the mixture is stirred at 100 DEG C until completely dissolved, and then slowly reduced from 100 DEG C to room temperature, so that the large-size metal cation doped Rb2CuBr3 scintillation crystal is obtained by slow crystallization. + 2+ + 2+ 2+ 3+ + 3+ 3+ 3+ etc. are doped to control the crystal kinetics, so that the crystal can be controlled to grow from micron level to centimeter level, and the scintillation performance under X-ray excitation is significantly improved.​​​​​​​​

The present disclosure provides a linear array detector, a computer tomography device and a projection imaging device; wherein the linear array detector comprises a circuit board and a plurality of pixels arranged on the circuit board; the plurality of pixels are arranged into N columns along a first direction and M rows along a second direction, N>M≥2 and N and M are integers, the first direction and the second direction intersect; each pixel comprises a silicon photomultiplier and a scintillation crystal coupled with the silicon photomultiplier, the scintillation crystal being used for converting X-rays into scintillation light; in any two adjacent rows of pixels, at least part of the silicon photomultipliers are arranged in a staggered manner in the first direction. The linear array detector can further improve the spatial resolution without further reducing the physical size of the silicon photomultiplier.