21results about How to "Improved energy resolution" patented technology

The invention provides a GaN-based alpha particle detector and a preparation method thereof, the GaN-based alpha particle detector comprises a substrate and an epitaxial structure epitaxially formed on the substrate, and the epitaxial structure comprises a multi-quantum well layer. A multi-quantum well layer is introduced, the multi-quantum well layer absorbs incident energy of alpha particles and correspondingly excites a large number of electron-hole pairs, and the electron-hole pairs are limited in quantum wells by the quantum confinement effect of the multi-quantum well layer, so that not only is the loss of electron-hole pair diffusion and recombination reduced, but also the service life of current carriers is prolonged, and the performance of the device is improved. The carrier collection efficiency of the alpha particle detector is greatly improved, and more electron-hole pairs can be collected and converted into electric signals to be output, so that the performance of the alpha particle detector is improved.

The invention belongs to the technical field of artificial crystals and radiation detection, and relates to a method for improving the performance of a rare earth orthosilicate scintillation crystal. The method for improving the performance of the rare earth orthosilicate scintillation crystal comprises the following steps: carrying out corrosion, plasma injection and annealing diffusion on the rare earth orthosilicate scintillation crystal, and finally realizing the improvement of the performance of the rare earth orthosilicate scintillation crystal.

The invention belongs to the technical field of digital signal processing, and particularly provides a nuclear pulse amplitude extraction method based on parameter identification and a nuclear pulse analysis system, which are used for solving the problem that the precision of an energy spectrum diagram is reduced due to baseline drift of a nuclear pulse signal and pulse accumulation and discarding, so that the energy resolution and the counting rate of the nuclear pulse energy spectrum diagram are improved. According to the method, accurate capture and processing of nuclear pulse signals can be realized, an original sampling sequence signal is processed by using a filtering method, the influence of baseline drift is reduced, parameter identification and amplitude extraction are carried out on stacked pulses processed by a combined filtering method by using a parameter identification model, and a high-precision spectrogram is generated; therefore, the energy resolution and the counting rate of the system are improved, and powerful technical support is provided for the fields of nuclear physics research, nuclear energy application, nuclear radiation detection and the like.

This invention relates to the field of nuclear radiation detection technology, and more particularly to an energy spectrum processing method for a quasi-hemispherical CdZnTe detector. The method includes: acquiring the raw signal collected by the quasi-hemispherical CdZnTe detector; normalizing the amplitude of the raw signal from the baseline to the highest point during the rise phase; dynamically selecting multiple energy thresholds; performing rise time discrimination on the normalized signal within each energy threshold; filtering out signals with rise times greater than RTflag and determining the rise time range corresponding to that energy threshold; constructing an intermediate energy spectrum corresponding to each energy threshold based on the signals with rise times greater than RTflag and the rise time range; and post-processing the intermediate energy spectrum to obtain the target energy spectrum corresponding to each energy threshold. This invention combines energy threshold discrimination, rise time discrimination, and energy spectrum post-processing algorithms to stably improve the energy resolution of the quasi-hemispherical CdZnTe detector for 662 keV gamma rays from the conventional 2%~3% to less than 1%.

The present invention relates to the technical field of neutron scattering, and in particular to a hyperbolic single crystal graphite analyzer used in a secondary spectrometer of a neutron spectrometer, which improves the energy resolution and detection efficiency of the neutron spectrometer by optimizing the geometric shape of the analyzer; the analyzer comprises a substrate, and both the horizontal (x) and vertical (y) directions of the substrate are designed into a hyperbolic trapezoidal structure according to a fourth-order polynomial, which determines the overall geometric shape of the analyzer; the present invention effectively solves the problems existing in the prior art through an innovative design of a hyperbolic single crystal graphite analyzer, significantly improves the performance of the neutron spectrometer, and has important value for neutron scattering research and applications in related fields.

The present invention relates to a large-area halide perovskite single crystal heterojunction and a growth method thereof and an application in a nuclear radiation detector. The growth method of the large-area halide perovskite single crystal heterojunction comprises the following steps: placing a pretreated cesium-bromine-lead or cesium-bromine-bismuth substrate in a reagent bottle containing a perovskite precursor solution, and then sealing it; fixing the sealed reagent bottle in a water tank, and performing epitaxial growth of a large-area halide perovskite single crystal film on the substrate by an inversion crystallization method or a cooling crystallization method to obtain a large-area halide perovskite single crystal heterojunction. The method of the present invention has the advantages of low cost, simplicity and high efficiency; the perovskite single crystal heterojunction detector of the present invention can effectively suppress the dark current drift caused by ion migration under reverse bias, thereby obtaining a detection effect with high sensitivity and low detection limit.

This invention relates to the field of semiconductor detection technology and discloses a mass spectrometry device with a variable configuration energy analyzer and its control method. By coordinating a variable slit mechanism, an electrode system, and a mode switching controller, this invention enables the same mass spectrometry device to flexibly switch between two operating modes: wide energy acquisition and high sensitivity, and narrow passband and high energy resolution. This resolves the contradiction that existing fixed-parameter energy analyzers cannot simultaneously meet the needs of different analytical tasks. Through pre-storing target operating mode parameter sets and a parallel control strategy, parameters for all operating modes are pre-calculated and calibrated, and can be directly recalled during mode switching without real-time calculation. Simultaneously, the slit width, the output voltage of each electrode, and the operating status of the ion source components are adjusted, effectively reducing the mode switching time and ensuring that the switching time is controlled within a set time, meeting the requirements for online real-time switching during process operations.

The present application provides a GaN-based α-particle detector and a preparation method thereof, including a substrate and an epitaxial structure formed on the substrate by epitaxy, wherein the epitaxial structure includes a multi-quantum well layer. By introducing the multi-quantum well layer, the multi-quantum well layer absorbs the incident energy of the α-particle and correspondingly excites a large number of electron-hole pairs, and the electron-hole pairs are confined in the quantum wells by the quantum confinement effect of the multi-quantum well layer, which not only reduces the loss of electron-hole pair diffusion and recombination, but also prolongs the life of carriers, greatly improves the collection efficiency of the α-particle detector for carriers, ensures that more electron-hole pairs can be collected and converted into electrical signal output, thereby improving the performance of the α-particle detector.

The invention provides a cerium-lithium co-doped lanthanum halide scintillation crystal and a preparation method and application thereof. The general formula of the cerium-lithium co-doped lanthanum halide scintillation crystal is Cex6LiyMzLa (1-x-y-z) X3-y, 0 < x < = 0.2, 0 < y < = 0.05, 0 < z < = 0.01, M is selected from at least one of Na, Mg, Ca, Sr, Ba or Zn, and X is selected from at least one of Cl or Br. 6LiBr and MXa are simultaneously doped into the LaX3: Ce crystal, a is 1 or 2, 6LiBr doping is utilized to realize neutron detection, MXa doping is utilized to improve the neutron-gamma discrimination capability, neutron-gamma dual-mode detection is realized through the synergistic effect of 6LiBr and MXa, and the neutron-gamma discrimination capability and detection efficiency of the scintillation crystal are further improved. The crystal also has the advantages of high energy resolution, high light output, short attenuation time and the like.

The invention relates to the technical field of underwater detectors, and discloses an underwater array radiation detector, which comprises a metal bracket, at least one NaI (T1) crystal detector and at least one CeBr3 crystal detector, the NaI crystal detector and the CeBr3 crystal detector are fixed in the first metal support. A metal protective net is arranged on the outer side of the NaI (T1) crystal detector and the outer side of the CeBr3 crystal detector. According to the invention, the detection efficiency and the detection speed are improved, the energy resolution is improved, the anti-interference capability is enhanced, the adaptability of the detector is enhanced, mobile radiation monitoring can be carried out, and the method can be suitable for radiation monitoring tasks in various complex environments.

The invention relates to a self-adaptive passing rate lanthanum bromide energy spectrum measuring device and method. The device comprises a dose rate monitoring unit, an analog switch control unit and a charge sensitive pre-amplification circuit. The dose rate monitoring unit monitors the environmental dose rate in real time, and the analog switch control unit automatically adjusts the resistance Rf in the charge-sensitive pre-amplification circuit according to the monitored dose rate, thereby changing the signal attenuation time tau, and ensuring that the pulse signal duration is shortened under the high dose rate so as to improve the passing rate. And meanwhile, relatively long signal decay time is kept at a low dosage rate so as to ensure high energy resolution. The measurement method relates to real-time monitoring of the dose rate and dynamic adjustment of the resistor Rf so as to adapt to pulse signal processing requirements in different dose rate environments.

The present application provides a kind of electrostatic deflection convergent energy analyzer, it has wide receiving angle and high two-dimensional convergent performance, can carry out imaging to two-dimensional real space image or emission angle distribution, and can carry out two-dimensional convergent and imaging under 90 ° deflection relative to the direction of incidence. One or more outer electrodes and multiple inner electrodes are arranged along the shape of two rotors formed on the inner side and outer side of common rotation axis. Among them, the inner surface shape of outer electrode is tapered, the diameter of which decreases towards both ends, and the outer surface shape of inner electrode is tapered, the diameter of which decreases towards both ends. Electron entrance hole and exit hole are formed on the outer electrode at both ends of the rotation axis respectively. Voltage for electron acceleration and deceleration is applied to outer electrode and inner electrode in proportion to the energy of incident electron. Voltage is applied to one or more electrodes except the inner electrode at both ends, which is twice or more than the converted acceleration voltage obtained by converting the energy of electron into acceleration voltage based on the potential of outer electrode where entrance hole is formed.

The invention relates to a multi-doped lanthanum bromide scintillation crystal and a preparation method thereof. The light-emitting non-uniformity of the head part and the tail part of the crystal is not more than 0.1%, the scintillation performance of the head part and the tail part of the crystal is consistent, the crystal quality is greatly improved, the application range of the crystal is widened, and the market prospect is wide. According to the preparation method disclosed by the embodiment of the invention, the preparation method of the multi-doped lanthanum bromide scintillation crystal in a secondary crystal growth mode by taking the crystal which is synthesized by a horizontal zone melting method and is free of surface and tail impurity layers as a raw material is provided for the first time, the operation is simple, the raw materials are easy to obtain, and the implementation of the whole preparation process is easy to realize. The problems of poor luminescence uniformity and the like caused by a component segregation phenomenon are avoided, the luminescence nonuniformity of the head part and the tail part of the crystal is improved to 0.07% from 1.12%, the energy resolution of the crystal is improved to 2.33% at 662 KeV from 2.94% at 662 KeV, and the quality of the crystal is greatly improved.

The invention belongs to the technical field of particle detection, and particularly relates to a proportional amplification gas detector which comprises a detector shell, an incidence window, an anode, a shielding grid mesh, a grid mesh voltage interface, an anode voltage and signal interface, a gas inlet and a gas outlet. The incident window is arranged on one end face of the detector shell, the incident window, the shielding grid mesh and the anode are arranged along the axis of the detector shell, the shielding grid mesh is located at a proper position between the incident window and the anode, and the grid mesh voltage interface, the anode voltage and signal interface, the air inlet and the air outlet are arranged on the detector shell. The grid voltage interface is used for providing voltage for the shielding grid, and the anode voltage and signal interface is used for providing voltage for the anode and receiving a detector signal. Signal interference of incident ions and ions generated by ionization on the anode of the detector is shielded, and the energy resolution of the detector is improved; and the signal-to-noise ratio of the detector is improved while the proportional amplification of the signal is realized.

The present application relates to a kind of variable chamber time projection chamber of low-energy single-energy neutron energy measurement, low-pressure working gas is filled in sealed chamber inside;Polyethylene support column is installed in sealed chamber, and a plurality of mounting slots are provided on polyethylene support column;Multiple cathode plate support is fixed on the mounting slot of polyethylene support column, and the mounting slot position can be replaced along the direction of polyethylene support column, and the moving step of replacement is centimeter level, anode plate is arranged at the lower bottom plate of sealed chamber;Grid plate support is fixed on the mounting slot of polyethylene support column, and the mounting slot position can be replaced along the direction of polyethylene support column, and the moving step of replacement is millimeter level;Single-energy neutron and low-pressure working gas scatter to form electron-ion pair, and move to anode plate along the direction of electric field.By setting variable chamber time projection chamber, the spacing between grid plate and anode plate can be adjusted, the error of recoil nuclear angle is reduced, the energy resolution is improved, and the neutron energy measurement uncertainty can be reduced to within 10%.

The invention discloses a hemispherical charged particle energy analyzer, which belongs to the technical field of charged particle energy spectrum testing, and comprises an inner / outer hemispherical electrode, an electrostatic lens, a deceleration electrode, a detector and a fringe electric field correction electrode, through the arrangement of the inner and outer concentric fringe electric field correction electrodes, the fringe electric field effect of the inner hemisphere electrode and the outer hemisphere electrode can be effectively corrected, and an effective fringe electric field correction effect is realized in different charged particle initial energy and selective passing energy test scenes. The problem that the flight track of charged particles is widened due to the fringe electric field effect is effectively relieved, and the energy resolution of energy spectrum testing is improved. Furthermore, the electrostatic lens adopts an eccentric incidence mode to enable the charged particles to enter the hemispherical deflector from the eccentric position, the eccentric incidence mode can further restrain the problem of broadening of the trajectory of the charged particles, and the energy spectrum resolution is improved.

The application relates to the technical field of semiconductor detector signal processing, and discloses a semiconductor detector signal processing method based on pixel diagonal pairing and double-path differential reading. The method comprises the following steps: acquiring a pixel array of a pixelated semiconductor detector; dividing the pixel array into a plurality of adjacent pixel modules; connecting two groups of diagonal pixels in each pixel module to form a first reading channel and a second reading channel; reading a first reading signal and a second reading signal; and performing spectral analysis on the two-path differential signals after shaping amplification and selecting the signal with a larger amplitude. Compared with the problem that the low-energy tailing, energy resolution and peak total ratio are reduced due to the small pixel effect of a large-pixel semiconductor detector in the prior art, the application can reduce the low-energy tailing, improve the energy resolution and the peak total ratio without significantly increasing the number of reading channels.

This invention provides a multichannel energy spectrum data communication method based on parity bits. The multichannel energy spectrum detection device sends energy spectrum data to a host computer in real time. During transmission, the 16-bit binary data is divided into two parts: the lower 8 bits are sent as a single byte using either odd or even parity, and the higher 8 bits are sent as a single byte using either even or odd parity. The host computer receives the energy spectrum data from the multichannel energy spectrum detection device and verifies it until all data is received. This invention utilizes serial communication principles, encoding the energy spectrum data uploaded in real time by the multichannel energy spectrum detection device using parity bits as flags. After receiving the data, the host computer judges and reassembles the data based on whether the parity check is incorrect, and the order of correct and incorrect parity checks, thus parsing out the corresponding energy spectrum data. This method is particularly suitable for measuring radioactive samples with high nuclear particle energy resolution and high activity.

The invention provides a high-performance vertical GaN-based alpha particle detector and a preparation method thereof. The high-performance vertical GaN-based alpha particle detector comprises a second contact electrode, a GaN substrate, a GaN epitaxial layer, a first contact electrode, a protection ring and a passivation layer which are stacked. A GaN substrate is set to be a heavily-Si-doped GaN substrate, a GaN epitaxial layer is set to be a lightly-Si-doped GaN epitaxial layer, the thickness of a first contact electrode is optimally designed, and a protection ring is designed, so that key performance indexes of the alpha particle detector in the aspects of sensitivity, charge collection efficiency, energy resolution, response speed, long-term reliability and the like are improved; reliable technical support and wide application prospects are provided for practical application of the high-performance GaN-based alpha particle detector.

The present application relates to a kind of digital pulse energy extraction methods based on multi-section pulse integration, including step 1, extracting digital signal, triggering filtering algorithm is used for the discrimination of signal;Step 2, according to the time of pulse arrival, determine the five-section / seven-section interval integral value of waveform sampling point recorded by firmware and two timestamp information;Step 3, according to the interval integral value and timestamp information in step 2, calculate baseline value;Step 4, according to the interval integral value and timestamp information in step 2 and baseline value in step 3, calculate pulse area.The algorithm is simplified to calculate the integral value of multi-section continuous pulse, which is convenient to realize on FPGA;The method based on five-section integration can solve baseline evaluation under high accumulation rate, and dead time is small;The method based on seven-section integration can improve the energy resolution when containing low-frequency noise.

The invention discloses an aluminum nitride detector with a full-vertical structure and a preparation method of the aluminum nitride detector. The aluminum nitride detector comprises an aluminum nitride substrate, a first semiconductor and an anode metal laminated layer which are arranged on the upper surface of the substrate, and a second semiconductor and a cathode metal laminated layer which are arranged on the lower surface of the substrate, ohmic contact electrodes are formed on the surfaces of the first semiconductor and the second semiconductor respectively, and mesa terminals are formed on the surfaces, not covered by the ohmic contact electrodes, of the first semiconductor and the second semiconductor and the upper surface and the lower surface of the aluminum nitride substrate in an etching mode. After bias voltage is applied to the full-vertical MSM structure, full collection of energy of high-energy particles is realized; the aluminum-gallium-nitrogen interface layers are introduced to the front surface and the back surface of the aluminum nitride substrate at the same time to realize excellent ohmic contact, so that the sensitivity and the energy collection rate of the aluminum nitride high-energy particle detector are improved; and the mesa terminal is prepared by etching the groove in the area outside the active area, so that electric leakage is reduced, and the energy resolution of the aluminum nitride high-energy particle detector is further improved.