173 results about "Scintillation" patented technology

The invention relates to the technical field of nuclear radiation imaging, in particular to a radiation array detector, a back scattering imaging system and a back scattering imaging method. The radiation array detector comprises an X-ray photon absorption structure which comprises high-strip-shaped scintillators and low-strip-shaped scintillators which are alternately arranged, the high-strip-shaped scintillators are used for detecting back scattering X-ray photons incident at all angles, the low-strip-shaped scintillators are used for accurately determining the incident direction of the X-ray photons through the collimation effect, and the high-strip-shaped scintillators and the low-strip-shaped scintillators are used for detecting the incident direction of the back scattering X-ray photons; after X-rays enter the photon absorption structure, the high-strip-shaped scintillators and / or the low-strip-shaped scintillators receiving X-ray photons generate scintillation photons. The silicon photomultiplier array is connected with the high strip-shaped scintillator and the low strip-shaped scintillator through a light guide and is used for converting scintillation photons into photoelectric signals; and the position and energy information coding circuit is used for carrying out position and energy information coding on the photoelectric signals generated by the silicon photomultiplier array. According to the invention, the detection efficiency and the direction identification capability of the back scattering X-ray can be effectively improved.

Some embodiments pertain to generating, transmitting, and using ionospheric disturbance information applicable to at least a part of the Earth's surface. The ionospheric disturbance information is transmitted in the form of at least one message comprising reference point ionospheric disturbance levels, i.e. levels associated with a plurality of reference points on a reference ionospheric shell. On the receiver side, an estimator is operated, and, for each of at least one NSS signal observed by a NSS receiver, the reference point ionospheric disturbance levels are used to decide whether to adopt some ionospheric disturbance mitigation measures in the context of estimating parameters useful to determine a position. The ionospheric disturbance information may for example comprise ionospheric amplitude scintillation information, ionospheric phase scintillation information, and / or ionospheric gradient information. Systems, vehicles, and computer programs are also disclosed.

X-ray scintillators based on amorphous organic metal halide hybrid films are demonstrated, which can be prepared via a facile solution processing with a non-crystalline organic halide salt reacting with metal halide at low temperature. The solution processed scintillators exhibit excellent scintillation properties, thermal stability, mechanical resilience, and processability.

The invention relates to a neutron measuring device (1). The device (1) comprises a housing (90), a high-density polyethylene block (10) in the housing (90), a shell made of neutron-absorbing material (20) integrated into the block (10), a first scintillation neutron detector (30) located inside the shell (20) and capable of emitting a signal proportional to the number of neutrons detected per unit of time, and a module (40) capable of converting the signal into a neutron count rate.

Described are embodiments of a multi-layer giga-pixel plenoptic camera that enable three-dimensional (3D) light-field imaging, high resolution and large field-of-view. In embodiments, the camera includes a radiation conversion array layer, an optics array layer, a complementary metal-oxide-semiconductor (CMOS) image sensor array layer, and a memory layer. Depending on the embodiment, the sequence of the radiation conversion array layer and the optics array layer may be reversed, and / or additional isolation layers may be provided between some of the layers. Applications can span the visible light spectrum, and can include ultraviolet (UV) and infrared (IR) spectra. In an embodiment, applications can span x-ray spectra and gamma ray spectra. Radiation converters in the radiation conversion array layer can be filters or scintillation converters. Optics in the optics array layer can be lenses or pinholes and / or coded apertures.

The invention discloses a highly-oriented quasi-two-dimensional perovskite multi-wafer scintillator for X-ray detection imaging and a preparation method of the highly-oriented quasi-two-dimensional perovskite multi-wafer scintillator, and relates to the technical field of radiation detection and scintillation materials, the highly-oriented quasi-two-dimensional perovskite multi-wafer scintillator comprises phenethyl ammonium bromide, cesium lead tribromide and ammonium thiocyanate, the molar ratio of the phenethyl ammonium bromide to the cesium lead tribromide to the ammonium thiocyanate is 2: 4: 2, the scintillator contains a methylamine thiocyanate additive which accounts for 0-1 equivalent weight of the dosage of the ammonium thiocyanate, and the scintillator is of a flaky polycrystal structure; the perovskite crystal of the polycrystalline wafer has a quasi-two-dimensional layered crystal structure, and each crystal grain is arranged in a height orientation manner, so that the layered crystal face is parallel to the main plane of the scintillator sheet. According to the highly-oriented quasi-two-dimensional perovskite multi-wafer scintillator for X-ray detection imaging and the preparation method of the highly-oriented quasi-two-dimensional perovskite multi-wafer scintillator, a highly-oriented layered structure is formed in the crystal, diffuse scattering of emergent light is greatly reduced, brightness uniformity and spatial resolution of X-ray imaging are improved, and a finer imaging effect is achieved.

Methods and systems are disclosed that enhance the yield and speed of emission and control the spectral and angular emission of light emitted by materials under irradiation by high-energy particles through a process known as scintillation. In each case, a photonic structure (of nano- or micron-scale feature sizes) is integrated with a scintillating material, and the photonic structure enhances the yield or controls the spectrum of the material. Various embodiments of this technology and practical demonstrations are disclosed.

The invention relates to a shimmering powder film and a manufacturing method thereof and an acrylic product, the shimmering powder film comprises a micro-optical functional layer, a reflecting layer, a protective layer, an adhesive layer and a release film, the micro-optical functional layer comprises a base material layer and a microstructure layer connected with the base material layer, and the microstructure layer is formed by imprinting a plurality of micro-lenses on UV light-cured resin; the reflecting layer comprises a resin carrier layer and a plurality of shimmering powder particles, the resin carrier layer is connected with the side, away from the base material layer, of the microstructure layer, and the shimmering powder particles are directionally arranged on the resin carrier layer; the protective layer is connected with one side, away from the microstructure layer, of the substrate layer; one side of the adhesive layer is connected with one side, far away from the substrate layer, of the reflecting layer, and the other side is connected with the release film; according to the shimmering powder film, ambient light is converged to the surfaces of the shimmering powder particles through the micro lenses, reflected light passes through the micro lenses twice from the surfaces of the shimmering powder particles to be amplified and scattered, strong flash beam-shaped scattering is formed, the brightness is remarkably improved, the relatively strong flickering feeling is achieved, and the visual attraction is improved; the manufacturing method of the shimmering powder film is simple and easy to control.

The invention discloses a muon imaging detection system and method based on scintillation fiber and SiPM reading. Comprising at least one detection unit, the detection unit comprises a scintillation optical fiber array and SiPM array support plates, the scintillation optical fiber array is formed by arranging a plurality of scintillation optical fibers in parallel, the two ends of the scintillation optical fiber array are each provided with one SiPM array support plate, SiPM arrays are integrated on the SiPM array support plates, the number of the SiPM units is the same as that of the scintillation optical fibers, and the SiPM units and the scintillation optical fibers are in one-to-one correspondence; the SiPM unit is optically coupled with one end of a corresponding scintillation optical fiber signal, receives a scintillation optical signal transmitted in the corresponding scintillation optical fiber and generates an electric signal; the signal processing unit is used for preprocessing the electric signal output by the SiPM to obtain a processed signal; and the positioning reconstruction unit is used for reconstructing the space motion trail of the muon according to the processed signal. The system can realize three-dimensional high-precision positioning and track reconstruction of muons, and has the advantages of high integration level, modular design and the like.

The utility model provides an X-ray detector and an imaging system. According to the X-ray detector, the positioning columns are matched with the positioning holes of the positioning sleeves fixed to the circuit board assembly, so that the flicker module and the photoelectric conversion module of the circuit board assembly are positioned and aligned more accurately. Moreover, the structure of the existing circuit board assembly does not need to be greatly changed, and the functions can be realized only by using the additionally arranged positioning sleeve with smaller processing error, so that the cost for developing a new circuit board assembly is saved. In the imaging system, more accurate positioning and alignment are realized by the flicker module and the photoelectric conversion module of the circuit board assembly, so that the signal-to-noise ratio of the X-ray detector for imaging can be improved, the risk of image artifacts is reduced, and better imaging quality is obtained.

The invention belongs to the technical field of crystal growth, and particularly relates to a Cs3Cu2I5 single crystal growth method. The method specifically comprises the following steps: taking cesium iodide and cuprous iodide as precursors, carrying out stirring reaction on the precursors and lewis acid in a polar aprotic solvent, hydrolyzing the lewis acid to generate an acid environment, inhibiting Cu < + > oxidation, and meanwhile, forming uniformly dispersed colloidal particles to obtain a precursor solution; and adding an anti-solvent into the precursor solution to enable the precursor solution to reach a supersaturated state, filtering, and carrying out single crystal growth by adopting an inverse temperature crystallization method. Lewis acid is added into the precursor solution, oxidation of Cu < + > is inhibited by utilizing a weak acid environment generated by hydrolysis of the Lewis acid, and the colloid stability of the precursor is improved, so that growth of the high-quality large-size Cs3Cu2I5 single crystal is promoted. The method is simple and convenient to operate and easy to control, can effectively improve the scintillation luminescence performance of the single crystal, and has a wide application prospect.

The invention relates to the technical field of preparation of lead-free metal halide scintillator crystal powder, and particularly discloses chlorine zirconium cesium crystal powder for a composite scintillator and a confinement growth method of the chlorine zirconium cesium crystal powder. The cesium zirconium chloride crystal powder is cesium zirconium chloride-gas phase oxide composite powder formed on the micro-nano scale by means of in-situ crystallization, and the cesium zirconium chloride crystal powder is composed of 50-95.3 wt% of cesium zirconium chloride and 4.7-50 wt% of gas phase oxide. The preparation method comprises the following steps: preparing zirconium chloride-gas phase oxide powder, preparing a cesium chloride solution, mixing zirconium chloride-gas phase oxide slurry, and growing chlorine zirconium cesium crystal powder in an in-situ crystallization confinement range. The cesium zirconium chloride crystal powder prepared by the method has the advantages of adjustable particle size, stable suspension and efficient scintillation luminescence performance, solves the problem of crystal powder-polymer phase separation in a composite scintillator, and can be used for large-scale preparation of the composite scintillator in the field of radiation detection.

The invention relates to an optical imaging device with soft X-ray radiation imaging capability and a preparation method thereof. The optical imaging device comprises an optical lens, a scintillation film layer and an imaging sensor, wherein the scintillation film layer is plated on the outer side of the incident surface of the optical lens and is used for converting incident soft X-rays into visible light in situ; the scintillation thin film layer comprises a doped yttrium aluminum garnet material; the optical lens is used for amplifying or reducing the visible light converted by the scintillation thin film layer for imaging; and the imaging sensor is used for receiving the visible light imaged by the optical lens so as to obtain a spatial distribution image of the soft X-ray. The invention has the beneficial effects that the scintillation film is directly plated at the foremost end of the lens, so that soft X-ray in-situ conversion is realized, optical signal spatial diffusion caused by an independent scintillation screen is thoroughly avoided, the imaging resolution is remarkably improved, the optical path is shortened, and the signal loss is reduced.

The present disclosure provides a neutron detector and a neutron detection method. The neutron detector comprises an absorption layer and a photoelectric detection device, wherein: the absorption layer comprises at least one gamma sensitive layer and at least one neutron sensitive layer, the neutron sensitive layer is embedded in the first side of the gamma sensitive layer, wherein: the to-be-detected neutron and the gamma background of the to-be-detected neutron are incident from the second side of the gamma sensitive layer, the first side is opposite to the second side, the gamma background deposits energy in the gamma sensitive layer to generate first scintillation light, and the to-be-detected neutron deposits energy in the neutron sensitive layer to generate second scintillation light; the photoelectric detection device is arranged on the first side of the gamma sensitive layer embedded with the neutron sensitive layer, and is used for detecting the first scintillation light and the second scintillation light, so as to realize the detection and discrimination of the to-be-detected neutron and the gamma background. The method realizes the improvement of the discrimination effect of neutron events and gamma events.

The invention belongs to the field of X-ray long-afterglow luminescent materials. The technical problems that traditional Pr < 3 + > doped fluoride is insufficient in afterglow performance, X-ray imaging depends on continuous irradiation, and color scattering noisy points exist are solved. The NaLuF4: Mg / Cs / Pr fluoride material is prepared by adopting a Cs < + >-Mg < 2 + > co-doping regulation strategy, the material is synthesized by an oleic acid-octadecene liquid phase method, and the X-ray excitation afterglow intensity of Pr < 3 + > is improved by about 110 times by utilizing the synergistic effect that Cs < + > enhances X-ray absorption and Mg < 2 + > optimizes a carrier shallow-deep trap level; the material is prepared into the high-light-transmittance rare earth nano flexible scintillation screen with the resolution ratio of 20.01 lp / mm. According to the invention, zero-noisy-point time-delay imaging after low-dose X-ray transient irradiation is realized, continuous irradiation is not needed, the radiation dose is lower, and the method is mainly applied to the field of X-ray time-delay imaging of low-dose medical diagnosis and industrial nondestructive testing. The method does not need continuous X-ray irradiation, and has important application value in the fields of medical diagnosis, industrial nondestructive testing and the like.

The application relates to a glass for liquid scintillation capillary array and a preparation method and application thereof. The glass components in terms of mole percentage include: 80-85% of SiO2; 0.5-4% of Al2O3; 4.5-8% of B2O3; the sum of K2O and Na2O is 2-8%; the sum of PbO and CdO is 1-2%; 1.5-4% of ZrO2; the sum of KFH2 and K2SiF6 is 1-4%; 0.2-0.5% of BaF2; and 0.5-1% of CeO2. The technical problem solved is how to provide a glass with low refractive index, high softening point, good anti-crystallization performance, good pressure resistance and radiation resistance, so that the glass can be used for preparing a liquid scintillation capillary array.

To provide both good time-of-flight resolution and interaction depth information. [Solution] The positron emission tomography apparatus according to the embodiment comprises a scintillation array and a photosensor array. The scintillation array includes a plurality of scintillator crystal units individually separated by a reflective material, and each scintillator crystal unit is configured to generate scintillation light in response to gamma-ray interactions within the scintillator crystal unit caused by gamma-ray irradiation from a subject, and has a substructure for decoding two or more depths within the scintillator crystal unit such that gamma-ray interactions at different depths cause scintillation light to escape from the photo-escape plane of the scintillator crystal unit in different patterns. The photosensor array converts the scintillation light received from the scintillation array into an electrical signal.

This invention discloses a short-window gamma-gamma turbulence parameter prediction method for space-to-ground laser communication, belonging to the technical field of space-to-ground laser communication and atmospheric turbulence channel parameter prediction. This method addresses the problems of traditional methods, such as strong dependence on long observation windows, significant degradation in prediction accuracy under short-window scenarios, and insufficient robustness under low signal-to-noise ratio conditions. It establishes a short-window observation model for the space-to-ground optical link and a gamma-gamma channel statistical model, constructs time-dependent short-window training data, and designs a short-window gamma-gamma network. Temporal features are extracted through a convolutional backbone, and a scintillation exponential physical regularization auxiliary head is used to achieve joint parameter prediction under physical constraints, outputting predicted gamma-gamma distributed parameters. This method can achieve high accuracy and good stability in parameter prediction under short observation windows and low signal-to-noise ratio conditions, and can be used for turbulence channel state characterization at the space-to-ground laser communication receiver.

The invention discloses an ionosphere scintillation monitoring and early warning method based on a CORS network, and belongs to the technical field of global navigation satellite system data processing and ionosphere monitoring. The method comprises the following steps: collecting GNSS observation data of each reference station of a CORS network and preprocessing the GNSS observation data to obtain standardized data; calculating a multi-dimensional station level flicker index based on the data; obtaining a regional flicker intensity field through space fusion and field reconstruction; fusing the multi-source auxiliary data to construct a dynamic threshold function; and comparing the flicker intensity field with a dynamic threshold, extracting a flicker event body through change detection and spatial analysis when the flicker intensity field exceeds the threshold, and performing graded early warning and multi-channel information release. The method is used for solving the problems that large-range continuous area monitoring is difficult to realize and the false alarm rate is high in the prior art.

The application discloses a preparation method and application of a rare earth cluster scintillator, and the scintillator material is prepared from 4,7-diphenyl-1,10-phenanthroline, 4-tert-butyl benzoic acid, titanium tetraisopropoxide and europium(III) acetate by a solvothermal reaction. The rare earth cluster scintillator material Eu2Ti4 prepared in the application has excellent flexibility and can be used for flexible imaging of non-planar materials. The minimum detection limit of the obtained scintillator is 32.89 nGy s ‑1 , which is 167 times lower than a standard medical diagnostic dose. The rare earth cluster scintillator process is simple, has high yield and fast crystal growth. The limit resolution of the Eu2Ti4-PDMS scintillation screen in the application exceeds 31 LP mm ‑1 at different temperatures, and the scintillation screen has excellent high-resolution X-ray radiation imaging capability and can be used as an ideal visualization tool for high-performance radiation imaging in extreme environments.

This invention provides an online monitoring system and method for krypton-85 based on a scintillation fiber bundle, specifically relating to the field of nuclear radiation monitoring. The online monitoring system includes: a gas pretreatment unit, a detection unit, an electronics and data acquisition unit, and a control unit. The detection unit is connected to the gas output terminal of the gas pretreatment unit. The detection unit includes a detection chamber, a scintillation fiber bundle, a first photomultiplier tube, a second photomultiplier tube, and a lead shield. The scintillation fiber bundle is disposed within the detection chamber, and the first and second photomultiplier tubes are respectively located at both ends of the detection chamber, with their photosensitive surfaces optically coupled to both ends of the scintillation fiber bundle. The lead shield covers the outside of the detection chamber. The electronics and data acquisition unit receives the output signal from the detection unit, and the control unit controls the automatic operation of the entire system, parameter setting, and data acquisition and processing. This invention solves the problems of poor timeliness and insufficient representativeness in traditional offline monitoring methods.

At present, the perovskite scintillating material mainly faces the following two key problems: 1, lead-based perovskite is high in toxicity and easy to degrade in wet oxygen; and 2, microcrystals in a traditional zero-dimensional perovskite scintillation screen are not uniformly dispersed, so that the imaging resolution is influenced. The one-dimensional lead-free perovskite scintillation material Cs6Cu3AgBr10 is synthesized through a thermal injection method, and the flexible scintillation film is prepared in combination with a vacuum filtration method. The method aims at obtaining a thin film structure which is uniform in microcrystal distribution and smooth and compact in surface so as to optimize X-ray absorption and reduce scattering, and therefore a new material and process solution is provided for achieving high-spatial-resolution X-ray imaging.

A detection assembly is provided. The detection assembly includes: at least one crystal including a first end and a second end oppositely disposed along a first direction. A processing unit provided at the first end of the at least one crystal. An optical partition extending along the first direction is provided within each of the at least one crystal, and the optical partition forms two optical channels extending along the first direction within the crystal. Along the first direction, each of the two optical channels includes a first end and a second end opposite to each other, the first ends of the two optical channels correspond to the first end of the at least one crystal, and the second ends of the two optical channels correspond to the second end of the at least one crystal and are optically connected. At least one grating structure is provided in at least one of the two optical channels, and the at least one grating structure is configured to differentiate propagation scintillation photons in the at least one of the two optical channels.

An atmospheric distortion compensator for a free space optical beam comprising: a disc that is rotationally balanced about a center point and that comprises a phase-modifying structure; an optical beam source configured to generate a free space optical beam that propagates through the disc and then through turbulence in open air to a point in space where reducing scintillation is desired, wherein the point in space is separated from the disc only by the open air; and a rotator mechanically coupled to the disc's center point and configured to spin the disc about an axis parallel to the free space optical beam, wherein the disc, when spinning, is configured to control a property of the free space optical beam thereby reducing scintillation effects as experienced at the point in space, which effects are caused by propagation of the free space optical beam through the open air.

The application discloses a scintillation pulse digitization method, device, equipment and storage medium, the digitization method comprises the following steps: presetting a plurality of threshold values; comparing a to-be-processed scintillation pulse with a first threshold value in the plurality of threshold values, outputting a jump signal and switching a next threshold value when the amplitude of the to-be-processed scintillation pulse exceeds the first threshold value, and continuing until the comparison of each threshold value is completed; and sampling the jump signal in sequence to obtain a threshold value-time pair corresponding to the time when the to-be-processed scintillation pulse exceeds each threshold value. The scintillation pulse digitization method, device, equipment and storage medium disclosed by the application can effectively reduce the hardware resources and logic resources occupied by signal sampling through dynamic switching of threshold values, and can also improve the accuracy of sampling points and the performance of a sampling system.

The scintillation detector comprises an annular scintillator (40) circumferentially segmented by being formed of a plurality of distinct scintillation elements (42) arranged in a circle around a central axis (A). Each scintillation element (42) is equipped with one or more silicon photomultipliers (60) for detecting photons emitted by the scintillation element (42).

This invention belongs to the field of satellite navigation and avionics technology, and proposes a deep learning-based adaptive integrity enhancement method and system for ionospheric scintillation-multipath coupling. The method includes: S1, signal data acquisition and preprocessing; S2, disturbance feature extraction and state identification; S3, generation of a comprehensive disturbance intensity index; S4, calculation of the adaptive Sigma expansion coefficient; S5, integrity calculation; and S6, integrity enhancement and adaptive optimization. This invention improves the integrity accuracy and reliability of navigation systems in complex signal environments, ensuring that the airborne equipment of the Global Navigation Satellite System (GLS) meets airworthiness standards during the CAT II / III precision approach phase.

The invention relates to the technical field of X-ray detection scintillator materials, in particular to a samarium-doped halide scintillation film for X-ray-near-infrared cooperative imaging and a preparation process thereof, and the preparation process comprises the following steps: S1, adding CsEu1-xSmxI3 (x is greater than 0 and less than or equal to 0.1) crystal powder into PMMA, adding an interface modifier, and fully stirring to obtain a mixture A; s2, acetone is added into the mixture A, tannic acid and an auxiliary modifier are added after magnetic stirring, ultrasonic treatment is conducted, and a solution B is obtained; and S3, dispensing the solution B on a pretreated substrate, airing at 25-30 DEG C, and after the solution is volatilized, obtaining the samarium-doped halide scintillation film for X-ray-near infrared cooperative imaging. According to the preparation process of the halide scintillation film, the film-forming carrier resin with PMMA as the core is matched with the efficient dissolving and dispersing effect of the acetone solvent, the simple and controllable dispensing film-forming process is adopted, reaction at high temperature is not needed, and the preparation method is simple, green, low in toxicity and low in cost.