119 results about "Scintillation crystals" patented technology

The invention relates to the field of crystal detection, and discloses a multifunctional comprehensive scintillation crystal and semiconductor material energy spectrum test system, which comprises a crystal adaptation module for judging the type and size of a placed crystal through an optical identification and parameter matching mechanism, and a signal acquisition module for amplifying, filtering and digitally processing an acquired signal, the signal correction module is used for correcting waveform distortion and baseline drift through a dynamic gain adjustment algorithm of a low-noise pre-amplifier and a multi-channel pulse analyzer; the data analysis module is used for generating an energy spectrum curve according to input signals and calculating energy resolution, counting rate, light attenuation time or carrier mobility, and the environment calibration module is used for dynamically evaluating shading degree, environment light, temperature and electromagnetic interference through an optical sensor and a temperature and humidity detector in the camera obscura and outputting updated calibration parameters. The method has the advantages of improving the detection efficiency, precision and consistency.

The invention belongs to the technical field of scintillation materials, and particularly relates to a chromium ion doped near-infrared scintillation crystal and a preparation method and application thereof. The chromium ion-doped near-infrared scintillation crystal has a molecular formula of A3B2-xCrxC3O12, x is greater than or equal to 0.005 and less than or equal to 0.1, and after a chromium ion-doped ultraviolet-visible light inorganic scintillator is adopted, light is emitted at the wavelength of 650-950 nm and has good wavelength matching with a silicon photoelectric detector. Besides, single crystal growth is carried out by adopting a Czochralski method, the crystal growth process is optimized, the ion doping concentration is regulated and controlled, the scintillation performance of the chromium ion doped near-infrared scintillation crystal in the near-infrared band is improved, the requirement of the chromium ion doped near-infrared scintillation crystal in the radiation detection field is further met, and the problem that an existing scintillation crystal is low in transparency is solved.

The invention relates to a micro-channel flow boiling in-situ measurement method, which comprises the following steps of: 1) establishing a micro-channel flow boiling test system (17), and testing to ensure the sealing performance and the stability of the test system; 2) building a synchrotron radiation X-ray imaging system; 3) performing a pre-test to ensure that synchrotron radiation X-rays can penetrate through the micro-channel, pass through the scintillation crystal (3) and the reflector (4) and then are received by the high-speed camera; (4) micro-channel flow boiling tests under different test working conditions are carried out, and after it is monitored that the wall surface temperature reaches an approximate steady state, the synchrotron radiation X-ray imaging system is used for shooting the flow boiling phenomenon in the micro-channel; meanwhile, a temperature and pressure sensor in the micro-channel flow boiling test system is used for collecting wall surface temperature and inlet and outlet pressure, and in-situ measurement results of the wall surface temperature and the inlet and outlet pressure are obtained. Compared with the prior art, the method has the advantages of solving the problem of view angle limitation existing in a micro-channel flow boiling observation means and the like.

Apparatuses and methods as described herein can be used to grow a β-Ga2O3 based single crystal using an Edge-defined film fed growth (EFG) method. The method can include bringing a seed crystal in contact with a Ga2O3 base melt, pulling the seed crystal to grow the β-Ga2O3 based single crystal, wherein the β-Ga2O3 based single crystal has a (010) crystallographic orientation as it is being grown, and cooling the β-Ga2O3 based single crystal after it has reached a length that is greater than 40mm. In one embodiment, the method includes growing the scintillation crystal without defects.

Tapered scintillator modules and detection devices having tapered scintillator modules in at least the end that contacts an optical sensor where the taper depends on the location of the scintillator module within the active area of the optical sensor is provided. Tapering of the scintillator modules may be close to the interface between the optical sensor and the module to minimize light leak to neighboring pixels at the interface while still allowing the detection device to retain high geometric efficiency and sensitivity to incident gamma rays since the distal end may not be tapered, which has a highest probability for gamma ray interaction based on Beer-Lambert law for photoelectric absorption.

A positron emission tomography (PET) scanner may include a plurality of gamma radiation detector modules arranged to form a detector ring. Each detector module may include an array of elongated scintillation crystals. With respect to the detector ring, each elongated scintillation crystal includes a proximal end-face, two axially oriented lateral faces, two transaxially oriented lateral faces, and a distal end-face radially oriented into the detector ring to receive a gamma photon. An array of photosensors is positioned along a first of the axially oriented lateral faces of each elongated scintillation crystal to detect scintillation photons. A reflective material is positioned on the proximal end-face, the distal end-face, the transaxially oriented lateral faces, and a second of the axially oriented lateral faces of each elongated scintillation crystal to internally reflect scintillation photons. In various embodiments, a dual-channel processing circuit provides distinct timing and energy signals from the photosensors.

A scintillation crystal can include a rare earth silicate, an activator, and a Group 2 co-dopant. In an embodiment, the Group 2 co-dopant concentration may not exceed 200 ppm atomic in the crystal or 0.25 at % in the melt before the crystal is formed. The ratio of the Group 2 concentration / activator atomic concentration can be in a range of 0.4 to 2.5. In another embodiment, the scintillation crystal may have a decay time no greater than 40 ns, and in another embodiment, have the same or higher light output than another crystal having the same composition except without the Group 2 co-dopant. In a further embodiment, a boule can be grown to a diameter of at least 75 mm and have no spiral or very low spiral and no cracks. The scintillation crystal can be used in a radiation detection apparatus and be coupled to a photosensor.

The utility model discloses a scintillation crystal packaging device, and relates to the scintillation crystal packaging technology field, the scintillation crystal packaging device comprises a pedestal, the top of the pedestal is provided with a damping mechanism used for reducing vibration, the damping mechanism is provided with an outer barrel, the inner wall of the outer barrel is provided with an inner barrel in a sliding manner, the outer barrel is provided with a cover plate in a sliding manner, and the cover plate is provided with an opening. A handle is arranged on the inner barrel in a sliding mode, the handle is arranged on the cover plate in a sliding mode, a sealing gasket is arranged at the bottom of the cover plate and makes contact with the outer barrel and the inner barrel, a rubber gasket is arranged on the cover plate, the handle makes contact with the rubber gasket, and a fixing mechanism used for applying pressure to the cover plate is arranged on the base. The fixing mechanism comprises two fixing frames, the two fixing frames are fixedly installed on the two sides of the outer barrel respectively, and a two-way screw rod is rotationally installed in the fixing frame on the front side, so that the scintillation crystal can be packaged conveniently, damping protection can be conducted on the scintillation crystal, operation is easy, and practicability is high.

Apparatuses and methods as described herein can be used to grow a β-Ga2O3 based single crystal using an Edge-defined film fed growth (EFG) method. The method can include bringing a seed crystal in contact with an alumina doped Ga2O3 base melt, pulling the seed crystal to grow the β-Ga2O3 based single crystal, and cooling the β-Ga2O3 based single crystal after it has reached a length that is greater than 40 mm. In one embodiment, the method includes growing the scintillation crystal without defects.

The application discloses a same-position integrated double neutron detector, a logging instrument and an application method, and belongs to the field of uranium ore exploration logging. The double neutron detector comprises first and second scintillation crystals which are both sensitive to thermal neutrons and are arranged in a face-to-face manner, a photoelectric converter and a supporting portion; the first and second scintillation crystals and the photoelectric converter are arranged along the same axis to form a detection portion which is read out by a common light path, and the supporting portion is fixedly arranged outside the detection portion and supports the detection portion to be an integral component; a slow moderation layer is arranged on the outer wall surface of the first scintillation crystal except the bonding area; the logging instrument is provided with the double neutron detector, and the first and second scintillation crystals are calibrated in the same thermal neutron field during application; the spatial consistency error is eliminated through the same-position design of the double scintillation crystals; the hardware structure of the detector electronics is simplified through the common light path reading out design; and the detector module is convenient to integrate.

Apparatuses and methods as described herein can be used to grow a β-Ga2O3 based single crystal using an Edge-defined film fed growth (EFG) method. The method can include bringing a seed crystal in contact with a Ga2O3 base melt, pulling the seed crystal to grow the β-Ga2O3 based single crystal, wherein the β-Ga2O3 based single crystal has a (010) crystallographic orientation as it is being grown, and cooling the β-Ga2O3 based single crystal after it has reached a length that is greater than 40 mm. In one embodiment, the method includes growing the scintillation crystal without defects.

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.

1. The name of the design product: multifunctional in-situ processing unit. 2. The use of the design product: applied to the in-situ processing unit in the NaI (6Li, Tl) scintillation crystal neutron gamma online monitoring system. 3. The design points of the design product: the combination of shape and pattern. 4. The picture or photo that best shows the design points: perspective view 1.

The invention relates to the technical field of SPECT detection equipment, and provides an SPECT-CT equipment probe device and a heat dissipation method applying the SPECT-CT equipment probe device, and the SPECT-CT equipment probe device comprises a heat insulation plate, a heat insulation outer cover, and a plurality of groups of scintillation crystals, a plurality of groups of SiPM sensors, a plurality of groups of SiPM temperature detectors, a refrigeration plate, a plurality of groups of semiconductor refrigeration sheets and a control circuit board which are arranged in the heat insulation outer cover; the multiple sets of semiconductor chilling plates and the multiple sets of SiPM sensors are correspondingly arranged in the vertical direction, so that one set of semiconductor chilling plates corresponds to one set of SiPM sensors, and one set of scintillation crystals and one set of SiPM temperature detectors are used in a matched mode. The control circuit board can independently control the refrigeration power of each group of semiconductor refrigeration sheets according to different temperatures of each group of SiPM sensors, so that each group of SiPM sensors can be cooled in a targeted manner, the temperature balance and stability of each group of SiPM sensors are ensured, the performance consistency of each group of SiPM sensors is ensured, and the data acquisition consistency and the image quality are ensured.

Apparatuses and methods as described herein can be used to grow a β-Ga2O3 based single crystal using an Edge-defined film fed growth (EFG) method. The method can include bringing a seed crystal in contact with an alumina doped Ga2O3 base melt, pulling the seed crystal to grow the β-Ga2O3 based single crystal, and cooling the β-Ga2O3 based single crystal after it has reached a length that is greater than 40mm. In one embodiment, the method includes growing the scintillation crystal without defects.

The invention relates to the technical field of radiation detection, in particular to a gamma ray detector and a gamma ray detection system. The detector comprises a substrate, a shading shell, a scintillation crystal, a silicon photomultiplier tube array, a first reflecting layer and a second reflecting layer, the shading shell is connected with the substrate so as to define an open inner cavity with the substrate; the scintillation crystal is located in the open inner cavity; the silicon photomultiplier tube array is located in the open inner cavity and is coupled with the scintillation crystal through an adhesive, and the silicon photomultiplier tube array is connected with the substrate to obtain electric energy; the first reflecting layer is arranged around the scintillation crystal; and the second reflecting layer is connected with a cavity opening of the open inner cavity to form a sealing structure. The invention has the advantages of magnetic interference resistance, miniaturization and high counting rate.

This invention discloses a scintillation crystal strip with an asymmetric surface configuration and its preparation method, comprising the following steps: (1) cutting and grinding a scintillation crystal blank into a crystal strip, and optically polishing all its surfaces; (2) selecting one of the following asymmetric surface configurations: end-face scattering, single-sided perturbation, or orthogonal perturbation; (3) selectively covering the polished surfaces to be retained using a masking fixture according to the corresponding surface configuration, and performing a sanding process on the uncovered predetermined surfaces until the predetermined surfaces are processed to a sanded surface. This invention innovatively proposes to perform asymmetric surface treatment on the scintillation crystal strip to construct a spatial asymmetric surface configuration, creating an anisotropic photon scattering environment inside the crystal, reconstructing the random walk of photons into a transport with a directional trend, thereby improving the light collection efficiency of the scintillation crystal strip without strictly relying on a high-performance external reflective layer, and synergistically improving the light output and energy resolution.

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 belongs to the technical field of radiation detection, and provides a double-GM counting tube and scintillator crystal detector intelligent switching radiation detection system and method, electronic equipment and a storage medium, the system comprises a power supply generation module, an analog signal processing module, a digital signal acquisition module and a digital signal control selection module which are connected in sequence; the digital signal control selection module comprises a control chip, and a scintillation transistor on-off control circuit, a low-range GM tube on-off control circuit and a high-range GM tube on-off control circuit which are respectively connected with the control chip; through the control chip, the scintillation transistor on-off control circuit, the low-range GM tube on-off control circuit and the high-range GM tube on-off control circuit, the most suitable detector is automatically selected according to the real-time radiation intensity, the stability and high efficiency of the system in different radiation intensity environments are ensured, and the monitoring accuracy and real-time performance are improved.

The application discloses a kind of co-doped Eu 3+ 、Sm 3+ Half of oxide-based red light scintillation crystal material and its preparation method and application, belong to artificial crystal growth technical field.Its chemical formula is (Sm x Eu y R 1‑x‑y )2O3, 0.01≤x≤0.08, 0.01≤y≤0.06, R is selected from any one of Lu, Sc, Y.R is Lu, the performance of crystal is more excellent, and it is more advantageous in the high-energy ray detection of extreme environment.R is Lu, and the crystal is transparent, and the appearance is good, has microsecond level decay time and high light yield, has excellent scintillation performance and extreme environment performance;It can be effectively combined with photoelectric detection equipment, can be used in extreme temperature, strong radiation nuclear radiation detection service environment, widen the application range of scintillation material, make up the application blank of traditional scintillation material in extreme service environment, meet the needs of nuclear detection and other scientific and technological development.

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 invention discloses a well type gamma beam monitoring detector, which comprises a BGO scintillation crystal with a central axial through hole channel, a scattering layer arranged at the incident end of the through hole channel, and a photoelectric sensor which is optically coupled with the emergent end of the BGO scintillation crystal and is provided with a through hole channel with the same specification in the center, the fluorescent reflecting layer and the protective shell sequentially cover the outer side of the BGO scintillation crystal; wherein the BGO scintillation crystal is of a cylindrical structure, and the aperture of the central axial through hole channel is 5-10 mm. According to the well-type gamma beam monitoring detector provided by the invention, the problems of signal saturation and pulse accumulation during single-pulse high-flux gamma beam measurement can be effectively avoided, the authenticity of an original beam energy spectrum can be maintained, the detection efficiency can be simulated and calibrated, and the well-type gamma beam monitoring detector is compact in structure, easy to integrate and low in cost. A response function can be established through Monte Carlo simulation to realize beam energy spectrum reconstruction and improve the measurement precision, and online stable real-time measurement of the beam energy spectrum and flux is realized.

A method for increasing the detection field of view of a SPECT arrangement, which is implemented by using a SPECT system (1) comprising one or more detection groups (11), each detection group comprising a detector (21), coincidence circuit (22), computer (23), the detector is arranged in a circumferentially uniform manner with the detection surface facing the detection area, first in a first position; the center of the detection surface of each detector is displaced laterally by a distance of not less than 3 cm or not less than 10% of the width of the detection surface of the detector to reach a second position; under the premise that the distance between the center of the detection surface of each detector and the center of the detection area is d, all detectors are rotated by a plurality of turns under the drive of the gantry, and the received detection signals are transmitted to the computer through the coincidence circuit, and the SPECT system controls all computers to complete image reconstruction. The detector is composed of a collimator layer (211), a scintillation crystal layer (212), a light guide layer (213), and a PMT array layer (214).

The present disclosure provides a detector, a passive neutron source imaging system and method. Wherein the detector can be applied to passive neutron source imaging, including a plurality of detection unit modules, each detection unit module including a plurality of scintillation crystal units, wherein the plurality of scintillation crystal units include N absorber units and M moderator units. By integrating the neutron deposition energy of each absorber unit in the N absorber units and integrating the neutron deposition energy of each moderator unit in the M moderator units, the total value of the deposition energy of the plurality of scintillation crystal units is obtained to determine the neutron deposition energy distribution of each detection unit module, thereby realizing the positioning imaging of the neutron source in 4π range, not only having high detection efficiency for neutron rays, but also having a wide neutron energy detection range, and realizing the accurate positioning of the radioactive source in 4π space.

The utility model belongs to the technical field of ionizing radiation detection, and particularly relates to a halide scintillation crystal detector for petroleum logging. The device comprises a shell and a reaction layer, the shell is a sealed shell, a scintillation crystal is packaged in the shell, and a light transmission device is coupled to a light emitting surface, corresponding to the scintillation crystal, of the shell; and the reaction layer is filled between the shell and the scintillation crystal and is used for absorbing water and oxygen. The utility model is used for solving the problem that the scintillation crystal is easy to deliquesce at high temperature. By filling the reaction layer in the shell for sealing and packaging the scintillation crystal, trace water and oxygen in a sealing system are removed by utilizing the reaction between the reaction layer and water and oxygen in the shell, so that the problem of deliquescence of the scintillation crystal caused by reaction between water and oxygen and the scintillation crystal is avoided.

A gamma ray measurement tool has a tubular shell, a gamma ray detector disposed in the tubular shell, and a shield disposed between the tubular shell and the gamma ray detector. The gamma ray detector has a scintillation crystal coupled to a photomultiplier tube, and the shield has a open window configured to allow gamma rays to pass through and reach the scintillation crystal. Further, the tubular shell has a first axis in the longitudinal direction, and the gamma ray detector has a second axis in the longitudinal direction, the first axis and the second axis do not coincide with each other, and a distance between the scintillation crystal and an inner surface of the tubular shell through the window is shorter than a distance between the scintillation crystal and a portion of the tubular shell covered by the shield.

The application discloses a front-end packaging structure of a low-temperature portable scintillator detector, which comprises a scintillation crystal, an adapter plate, a micro-channel heat sink and a metal shielding shell; the metal shielding shell is internally provided with a sensor array, a ceramic plate, a crystal fixing frame, a fixing frame, a fixing plate, a cold storage block and a semiconductor refrigeration sheet; the opening of the metal shielding shell is connected with the micro-channel heat sink to form a closed structure; the scintillation crystal is located inside a cavity formed by the crystal fixing frame, the fixing frame, the sensor array and the ceramic plate; the cold storage block is located between the cold surface of the semiconductor refrigeration sheet and the ceramic plate, and the devices are filled with heat-conducting silica gel; one end of the adapter plate is electrically connected with the sensor array through the ceramic plate, and the other end extends to outside the shell; the space among the ceramic plate, the fixing frame and the cold storage block is filled with electronic potting glue; and the gap among the crystal fixing frame, the fixing frame, the metal shielding shell and the micro-channel heat sink is filled with polyurethane foam. The application can effectively reduce the temperature of the sensor array and improve the energy resolution of the detector.

The invention particularly relates to a combined detector for an online sipping device. The combined detector comprises a beta-ray detector, a gamma-ray detector and a signal processing system, the beta ray detector adopts a plastic scintillation chamber with a high beta / gamma response ratio; the gamma ray detector adopts a scintillation crystal; the signal processing system is configured to perform beta-gamma coincidence measurement on output signals of the beta-ray detector and the gamma-ray detector; the plastic scintillation chamber is adjacent to the scintillation crystal space, and the detection areas of the plastic scintillation chamber and the scintillation crystal space are at least partially overlapped so as to jointly detect the detected gas flowing through the plastic scintillation chamber. The invention further relates to a nuclear fuel assembly damage detection method which adopts the combined detector. According to the invention, comprehensive detection of beta and gamma rays of radioactive inert gas is realized, and efficient and sensitive measurement of beta rays in large-volume radioactive inert gas is realized, so that the efficiency and accuracy of gamma-beta coincidence measurement are improved.

The utility model discloses a double-spacing integrated gamma detector and a logging instrument, and relates to the field of uranium exploration logging. The detector comprises a shell, a double-probe assembly and a readout electronics module, wherein the double-probe assembly is composed of a near-spacing probe and a far-spacing probe; the near source distance probe and the far source distance probe are fixedly arranged in the shell at an interval and are both arranged to be radiation-resistant scintillation crystals connected with photoelectric converters; a central cavity is defined between the near source spacing probe and the far source spacing probe as well as the inner wall surface of the shell, and the readout electronics module is integrally arranged in the central cavity; the inner wall surface of the shell is coated with a shielding layer; according to the detector, the spatial multiplexing architecture is combined with mechanical rigid fixation, so that the structure is compact, the source distance offset is eliminated, and the measurement reliability is improved.