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125results about How to "Increase count rate" patented technology
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Neutron detectors and related methods
ActiveUS7372041B1Sacrificing spatial resolutionImprove detection efficiencyMeasurement with scintillation detectorsMaterial analysis by optical meansScintillatorBiology
The present invention relates generally to neutron detecting scintillators and related methods and devices. A neutron detecting scintillator includes a plurality of microcapillary tubes loaded with a scintillator composition comprising a plastic scintillator and a neutron absorbing material. The present invention additionally provides methods of producing a neutron detecting scintillator having a plurality of microcapillary tubes loaded with a scintillator composition comprising a plastic scintillator and a neutron absorbing material. The method includes preparing a solution comprising a monomer and a neutron absorbing element, introducing the solution into a microcapillary tube of the plurality, and polymerizing the solution within the microcapillary tube.
Owner:RADIATION MONITORING DEVICES
Flexible scintillator and related methods
ActiveUS7375341B1Improved performance radiation detectionImproved imaging assemblyMaterial analysis by optical meansRadiation intensity measurementOptoelectronicsScintillator
The present invention provides flexible radiation detectors and related methods, including methods of making radiation detectors and assemblies according to the present invention. A flexible radiation detector includes a first resin layer and a scintillator layer deposited on the first resin layer. A method of making a flexible radiation detector includes forming a first resin layer on a substrate, depositing a scintillator layer on the first resin layer, and removing from the substrate at least a portion of a combination comprising the first resin layer and the scintillator, thereby producing a flexible radiation detector comprising the removed portion of first resin layer and scintillator layer.
Owner:RADIATION MONITORING DEVICES
Apparatus and method for temperature correction and expanded count rate of inorganic scintillation detectors
InactiveUS20050269513A1Increase count rateMaterial analysis by optical meansRadiation intensity measurementPhysicsRadiation
The present invention includes an apparatus and corresponding method for temperature correction and count rate expansion of inorganic scintillation detectors. A temperature sensor is attached to an inorganic scintillation detector. The inorganic scintillation detector, due to interaction with incident radiation, creates light pulse signals. A photoreceiver processes the light pulse signals to current signals. Temperature correction circuitry that uses a fast light component signal, a slow light component signal, and the temperature signal from the temperature sensor to corrected an inorganic scintillation detector signal output and expanded the count rate.
Owner:LOS ALAMOS NATIONAL SECURITY
Histone deacelylase inhibitors in diagnosis and treatment of thyroid neoplasms
InactiveUS20040132643A1Increase count rateAdequate imagingBiocideRadioactive preparation carriersLymphatic SpreadRadioactive iodine therapy
Disclosed herein are novel approaches to thyroid cancer therapy. These approaches include methods to enhance thyroid specific gene expression, for example methods to enhance expression of thyroglobulin and / or the Na<+> / I<-> symporter in thyroid cancer cells. Enhanced expression of thyroid-specific genes promotes cellular differentiation and reduces biologically aggressive behavior such as invasion and metastasis. In addition, enhanced expression of thyroglobulin and / or the Na<+> / I<31 > symporter increases the ability of thyroid cancer cells to concentrate iodine or iodide, thereby making the cells more susceptible to radioactive iodine therapy. Also disclosed herein are methods for detecting thyroid neoplasms in a subject, by administering a therapeutically effective amount of a histone deacetylase inhibitor, administering a detectable agent whose uptake or concentration in thyroid cells is increased by administration of the histone deacetylase inhibitor, and detecting the detectable agent.
Method and apparatus for improving resolution in spectrometers processing output steps from non-ideal signal sources
InactiveUS20040158440A1Increase rangeAccurate valueAmplifier modifications to reduce noise influenceDigital computer detailsTime correlationImage resolution
A method and apparatus for processing step-like output signals (primary signals) generated by non-ideal, for example, nominally single-pole ("N-1P ") devices. An exemplary method includes creating a set of secondary signals by directing the primary signal along a plurality of signal paths to a signal summation point, summing the secondary signals reaching the signal summation point after propagating along the signal paths to provide a summed signal, performing a filtering or delaying operation in at least one of said signal paths so that the secondary signals reaching said summing point have a defined time correlation with respect to one another, applying a set of weighting coefficients to the secondary signals propagating along said signal paths, and performing a capturing operation after any filtering or delaying operations so as to provide a weighted signal sum value as a measure of the integrated area QgT of the input signal.
Owner:WARBURTON WILLIAM K
Digital pileup waveform processing method and system
ActiveCN102073059AImprove signal-to-noise ratioReduce lossPulse descriminationX/gamma/cosmic radiation measurmentCounting rateSignal-to-noise ratio (imaging)
The invention discloses a digital pileup waveform processing method and a digital pileup waveform processing system. The method comprises the following steps of: determining a pulse rising edge area, and judging whether a pulse has a pileup waveform or not according to a time interval between adjacent pulse rising edges; and dividing a digital waveform determined as pileup according to the risingedge and the falling edge of the pulse, reconstructing single event pulse waveforms in turn by using the divided waveform, and extracting single pulse information from the reconstructed waveforms. The invention also discloses the pileup waveform processing system, which comprises a pileup waveform discrimination module, a pulse waveform division module and a pulse waveform reconstruction module. By the method and the system, the pileup pulse waveform can be effectively discriminated, each single event pulse waveform in the pileup is accurately reconstructed, information such as energy, time, amplitude, decay time constant, position and the like of the single event pulse is accurately recovered, and the counting rate of a system under high activity, and the signal-to-noise ratio of a measuring result are improved.
Owner:HUAZHONG UNIV OF SCI & TECH +1
Multi-layer scintillation detector and measurement method for high-energy proton and neutron energy spectrum measurement
ActiveCN103698801AFast time responseIncrease count rateX-ray spectral distribution measurementMeasurement with scintillation detectorsNeutron energy spectrumPhotomultiplier
The invention discloses a multi-layer scintillation detector and a measurement method for high-energy proton and neutron energy spectrum measurement. The sensitive volume of the detector is formed by wrapping a scintillant with another scintillant; an interlayer is arranged between the inner layer scintillant and the outer layer scintillant; two photomultipliers are arranged on the two sides of the scintillants, and correspond to the two scintillants respectively; the interlayer is provided with a window in a position corresponding to the inner layer photomultiplier; the scintillants are pressure-welded and fixed by a housing; and the photomultipliers are fixed on the housing by photomultiplier bases. The detector can be used for the high-energy proton and neutron energy spectrum measurement under a charged particle, neutron and gamma ray complicated mixing field.
Owner:NORTHWEST INST OF NUCLEAR TECH
Radiation detector, method of manufacturing a radiation detector and use of the detector for measuring radiation
ActiveUS20110079728A1Slow energyWeaken energyMeasurement with semiconductor devicesSolid-state devicesHigh resistivity siliconVertical channel
A radiation detector is disclosed. The detector has an entrance opening etched through a low-resistivity volume of silicon, a sensitive volume of high-resistivity silicon for converting the radiation particles into detectable charges, and a passivation layer between the low and high-resistivity silicon layers. The detector also has electrodes built in the form of vertical channels for collecting the charges generated in the sensitive volume, and read-out electronics for generating signals based on the collected charges.
Owner:FINPHYS OY SENCE CENT
Device for processing a signal delivered by a radiation detector
ActiveUS20110098980A1Increase count rateGood precisionAmplifier modifications to reduce noise influenceDigital computer detailsVoltage pulseDigital converter
The invention concerns a device for processing a signal delivered by a radiation detector (1), the device comprising a circuit (2, 3) able to deliver a voltage pulse whereof the amplitude is proportional to a charge detected by the detector (1) and an analog / digital converter (ADC) that digitizes the voltage pulse at a given sampling frequency and delivers a digital signal, characterized in that it comprises, downstream of the analog / digital converter (ADC), a processing circuit (5) that comprises:a reading unit for reading the digital signal (S (t)) delivered by the analog / digital converter (ADC),a computing unit that computes a temporal variation rate of the read digital signals, anda circuit able to capture the read digital signals whereof the temporal variation reaches a predetermined threshold.
Owner:COMMISSARIAT A LENERGIE ATOMIQUE ET AUX ENERGIES ALTERNATIVES
Apparatus and method for temperature correction and expanded count rate of inorganic scintillation detectors
InactiveUS7081626B2Increase count rateMaterial analysis by optical meansRadiation intensity measurementCounting rateSlow light
The present invention includes an apparatus and corresponding method for temperature correction and count rate expansion of inorganic scintillation detectors. A temperature sensor is attached to an inorganic scintillation detector. The inorganic scintillation detector, due to interaction with incident radiation, creates light pulse signals. A photoreceiver processes the light pulse signals to current signals. Temperature correction circuitry that uses a fast light component signal, a slow light component signal, and the temperature signal from the temperature sensor to corrected an inorganic scintillation detector signal output and expanded the count rate.
Owner:LOS ALAMOS NATIONAL SECURITY
Particle-counting apparatus with pulse shortening
InactiveUS8415635B2Reduce temporal extensionGain is not constantPhotometrySolid-state devicesAudio power amplifierPeak value
A particle-counting apparatus is described, which reduces a resulting width of pulses when a charge pulse is received from a particle detector, thereby reducing pile-up problems with pulses. Pulse shortening is obtained by resetting the pulse shortly after it exceeds its peak level at the apparatus output. The apparatus includes a charge-sensitive amplifier and a shaper which generates an output for subsequent discrimination circuits. A reset generator monitors the shaper output and generates a reset signal to the shaper when a peak has been detected.
Owner:KONINKLIJKE PHILIPS ELECTRONICS NV
Multi-channel pulse amplitude analyzer
InactiveCN101937096AReduce dead timeIncrease count rateX-ray spectral distribution measurementSequence controlSequence signal
The invention provides a multi-channel pulse amplitude analyzer, wherein, channels work independently for carrying out multi-channel relevance measurement to improve measurement real-time property, and the analyzer has the advantages of simplified structure and flexible expansion. The multi-channel pulse amplitude analyzer comprises a plurality of pulse peak detection circuits, a plurality of ADCs, a plurality of multi-channel data storage circuits, a network transmission module and a timing sequence control circuit, wherein, the pulse peak detection circuits work independently for receiving a multi-channel pulse signal, detecting arrival time of peaks and outputting a plurality of screening signals respectively; the ADCs work independently for starting up A / D conversion on the multi-channel pulse signal and outputting conversion data; the multi-channel data storage circuits receive the conversion data and carry out counting storage; the network transmission module reads and outputs storage data; and the timing sequence control circuit generates a timing sequence signal for controlling an operating timing sequence of the circuits.
Owner:NUCTECH CO LTD
Method and apparatus for improving resolution in spectrometers processing output steps from non-ideal signal sources
InactiveUS6587814B1Low electronic noise levelImprove noiseRecording apparatusX-ray spectral distribution measurementHigh rateGamma ray
A method and apparatus for processing step-like output signals generated by non-ideal, nominally single-pole ("N-1P") devices responding to possibly time-varying, pulse-like input signals of finite duration, wherein the goal is to recover the integrated areas of the input signals. Particular applications include processing step-like signals generated by detector systems in response to absorbed radiation or particles and, more particularly, to digitally processing such step-like signals in high resolution, high rate gamma ray (gamma-ray) spectrometers with resistive feedback preamplifiers connected to large volume germanium detectors. Superconducting bolometers can be similarly treated. The method comprises attaching a set of one or more filters to the device's (e.g., preamplifier's) output, capturing a correlated multiple output sample from the filter set in response to a detected event, and forming a weighted sum of the sample values to accurately recover the total area (e.g., charge) of the detected event.
Owner:WARBURTON WILLIAM K
Spectral imaging system and method
InactiveUS9488739B2Increase count rateImprove responseComputerised tomographsTomographyX-rayX ray image
Spectral x-ray imaging using a photon counting x-ray detector (PCXD) transmits a broad spectrum x-ray beam through an object, detects the transmitted x-ray beam with the PCXD and processes the detected signals to determine material characteristics of the object using both the detected signals as a function of detector layer and the detected signals as a function of the particular energy band. Each detector layer of the multiple detector layers produces at least two signals, each signal representing a detected x-ray intensity in a particular energy band, and the depth information contained in the separate read-out channels.
Owner:THE BOARD OF TRUSTEES OF THE LELAND STANFORD JUNIOR UNIV
Single photon detector with high counting rate
InactiveCN1482470AIncrease count rateElectromagnetic transmissionRadiation intensity measurementCapacitancePhoton detection
A high enumeration rate single photon detector characterized by that, in the existing single photon detector circuit an active quick-speed recovery circuit is arranged comprising an electronic switchand a control circuit, the electronic switch is connected between the anode and the earth terminal of the snow slide diode for controlling the start and stop of the electronic switch. During the recovery time, the control circuit exports a positive pulse, making the electronic switch conducting, the node capacitor and the distributed capacitor of the avalanche diode are quickly charged to Va and discharged to 0 volt respectively through the small resistance electronic switch.
Owner:EAST CHINA NORMAL UNIV
High-speed-quenching and high-speed-recovery free-operation single-photon detection system
ActiveCN107271036AImprove detection efficiencyIncrease count ratePhotometry electrical circuitsDead timePhoton detection
The invention discloses a high-speed-quenching and high-speed-recovery free-operation single-photon detection system. The system is characterized in that the system includes an SPAD (single-photon avalanche diode), a peripheral circuit module 1 thereof, an identification and shaping module 2, a time delay and amplification module 3 and an active quenching and recovery module 4; the SPAD and the peripheral circuit module 1 thereof extract avalanche signals and input the avalanche signals to the identification and shaping module 2; the identification and shaping module 2 identifies and shapes the avalanche signals so as to obtain counting signals; the counting signals are inputted to the time delay and amplification module 3 and then are divided into two paths, wherein one path passes through an operational amplifier, so that active quenching signals can be obtained, and the other path is subjected to dead time setting delay and shaping, so that active recovery signals are obtained; the active quenching signals and the active recovery signals are inputted to the active quenching and recovery module 4; and the electric level signals of the active quenching and recovery module 4 are connected into the anode of the SPAD, so that the high-speed quenching and high-speed recovery of the SPAD are realized. With the system adopted, the detection efficiency and counting rate of a single-photon detector can be improved.
Owner:UNIV OF SCI & TECH OF CHINA
Method and appts. for gamma radiation detection imaging
InactiveCN1564022AImprove spatial resolutionHigh resolutionX/gamma/cosmic radiation measurmentPhotocathodeGamma ray
Photocathode is coated by vaporization on surface of scintillating crystal array. Crystal array emits scintillating light caused by gamma rays. Photoelectrons are excitated under action between scintillating light and photocathode material. Photoelectrons are collected and exported. After gain amplification of the signal, Energy and spatial location of gamma rays are calculated from signal of impulse voltage. In the equipment, scintillating crystal array is placed in insulated bracket in vacuum chamber. Photocathode is on one side of the scintillating crystal array, and grid electrode is led out. Microchannel plate and imaging anode are in on another side of photocathode. One end of leading out cable is connected to imaging anode, and the other end is out of vacuum envelope. Features are high resolution in space and energy, and compact size.
Owner:谢舒平 +2
Radiation detector, method of manufacturing a radiation detector and use of the detector for measuring radiation
ActiveUS8461541B2Slow energyWeaken energyMeasurement with semiconductor devicesSolid-state devicesHigh resistivity siliconVertical channel
Owner:FINPHYS OY SENCE CENT
Spectral Imaging System and Method
InactiveUS20150168570A1Improve overall energy responseIncrease overall countRadiation/particle handlingTomographyPhysicsX ray image
Spectral x-ray imaging using a photon counting x-ray detector (PCXD) transmits a broad spectrum x-ray beam through an object, detects the transmitted x-ray beam with the PCXD and processes the detected signals to determine material characteristics of the object using both the detected signals as a function of detector layer and the detected signals as a function of the particular energy band. Each detector layer of the multiple detector layers produces at least two signals, each signal representing a detected x-ray intensity in a particular energy band, and the depth information contained in the separate read-out channels.
Owner:THE BOARD OF TRUSTEES OF THE LELAND STANFORD JUNIOR UNIV
Dynamic optimization of the signal-to-noise ratio of dual-energy attenuation data for reconstructing images
ActiveCN101416073AIncrease count rateImprove signal-to-noise ratioX/gamma/cosmic radiation measurmentDynamical optimizationComputational physics
Described is a method for dynamically optimizing the signal-to-noise ratio of attenuation data related to two different X-ray energies for reconstructing an image of an object under examination. The method comprises (a) estimating the thickness and the material composition of the object at a plurality of different projection angles, (b) for each of the various projection angles calculating for a variety of combinations of different first and second X-ray energies a corresponding common signal-to-noise ratio, (c) for each of the various projection angles choosing the first and the second X-ray energy causing the maximum corresponding common signal-to-noise ratio, and (d) for each of the various projection angles acquiring X-ray attenuation data of the object whereby the two X-ray energies are the X-ray energies causing a maximum signal-to-noise ratio assigned to the respective projection angle.
Owner:KONINKLIJKE PHILIPS ELECTRONICS NV
Analog digital mixed pulse amplitude analyzer and analysis technology thereof
ActiveCN106353788ANovel structureRealize functionX-ray spectral distribution measurementCounting rateDead time
The invention discloses an analog digital mixed pulse amplitude analyzer and an analysis technology thereof. The analog digital mixed pulse amplitude analyzer comprises a detector, a fast channel circuit, a slow channel circuit and an FPGA (Field Programmable Gate Array), wherein the fast channel circuit is connected with the output end of the detector through a differentiating circuit, and is used for carrying out amplitude comparison on an exponential signal output by the differentiating circuit, and generating rectangular pulse signals; the slow channel circuit is connected with the output end of the detector through an integrating circuit, and is used for splitting a Gaussian signal output by the integrating circuit, and acquiring baseline values of nuclear pulse signals; the FPGA is connected with the fast channel circuit and the slow channel circuit, and is used for controlling working timing of the fast channel circuit and the slow channel circuit, measuring a time interval of two rectangular pulse signals, determining an optimal baseline value and judging whether signal accumulation occurs or not according to the time interval, and eliminating the counting rate loss brought by the signal accumulation through counting rate correction if the signal accumulation occurs. The analog digital mixed pulse amplitude analyzer has the advantages of fast processing speed, less dead time, low power consumption, high counting rate and the like.
Owner:成都飞派科技有限公司
Single photon detector and photon number resolving detector
InactiveUS20120085891A1Reduce probabilityEnhanced photon count rateMaterial analysis by optical meansPhotometry electrical circuitsCounting rateCapacitance
Provided is a single photon detector and a photon number detector which use an APD and include an auxiliary signal generator, a light receiving element, a mixer, and a determiner The auxiliary signal generator generates an auxiliary signal. The light receiving element receives a photon to output an electric signal. The mixer receives and mixes an output signal of the light receiving element and the auxiliary signal. The determiner determines whether the photon is received or the number of received photons. The single photon detector and photon number resolving detector detect an avalanche of an amplitude less than the amplitude of a capacitive response. A probability that an after pulse is generated can be reduced. A photon count rate is enhanced. The influence on the waveform of the gate signal can be decreased. The frequency of the gate signal can be continuously changed.
Owner:ELECTRONICS & TELECOMM RES INST
Photodiode array
Owner:HAMAMATSU PHOTONICS KK
Method and instrument for controllable source neutron logging during drilling
ActiveCN103527181AReduce the numberIncrease count rateDrilling rodsDrilling casingsLong spacingHigh energy
The invention discloses a method and instrument for controllable source neutron logging during drilling. The method comprises the steps that a pulse neutron source on a drill collar is started and quantitative high-energy neutrons are emitted to a stratum in a pulse mode; the number of thermal neutrons with the speed reduced by the stratum is measured through a long spacing detector and a short spacing detector which are arranged on the drill collar respectively, wherein the thermal neutrons are scattered back to a well hole; according to the number, measured through the two spacing detectors, of the thermal neutrons, the macroscopic capture cross section sigma of the thermal neutrons and the porosity phi of the stratum are obtained; the stratum water saturation Sw is obtained according to the macroscopic capture cross section of the thermal neutrons and the porosity phi. The instrument comprises the pulse neutron source, a detection unit, a signal processing and data analyzing unit and a power module used for supplying power for the detection unit and the signal processing and data analyzing unit. The thermal neutrons are detected through the long spacing <3>He thermal neutron detector and the short spacing <3>He thermal neutron detector, two sets of parameters including the porosity and the macroscopic capture cross section of the thermal neutrons and are obtained, and therefore the measurement of the water saturation and the porosity of the stratum with a relatively low degree of mineralization is achieved. Due to the use of the pulse neutron source, damage, caused by a radioactive source, to human and the environment is eliminated.
Owner:BC P INC CHINA NAT PETROLEUM CORP +1
Power spectrum analysis method, power spectrum analysis system and Gamma ray detection system
InactiveCN105301627ASimple structureQuick responseX-ray spectral distribution measurementRadiation intensity measurementPulse shapingGamma ray detection
The invention relates to a power spectrum analysis method. The method comprises the steps: converting particle energy into an initial pulse signal, processing the initial pulse signal into a step pulse signal, converting the step pulse signal into a rectangular pulse signal after pulse shaping of the step pulse signal, enabling the pulse amplitude of the rectangular pulse signal to be a set value, enabling a corresponding relation to be formed between the pulse width of the rectangular pulse signal and the pulse amplitude of the step pulse signal, measuring the pulse width of the rectangular pulse signal and corresponding pulse counting to obtain the pulse width spectrum of the rectangular pulse signal, converting the pulse width spectrum into a pulse amplitude spectrum according to the corresponding relation between the rectangular pulse width and the step pulse amplitude or directly converting the pulse width spectrum into a power spectrum of particles according to a corresponding relation between the rectangular pulse width and the energy of particles. The invention also relates to a power spectrum analysis system and a Gamma ray detection system. The invention helps to solve the problem of the prior art that a power spectrum analysis process contains a complicated A / D converting circuit and thus the integration level is difficult to improve.
Owner:CHONGQING UNIV
Single channel pulse height analyzer realized by applying peak position detecting method
InactiveCN104155678ASimple structureReduce dead timeX-ray spectral distribution measurementCounting rateNuclear radiation
A single channel pulse height analyzer realized by applying a peak position detecting method is characterized in that in the working circuit, detected nuclear pulse signals are subjected to filtering formation through an amplifier, and are outputted to an upper screening circuit, a lower screening circuit and a peak position detection circuit respectively through input circuits; the output signals processed by the upper screening circuit and the lower screening circuit are respectively inputted to the S end and the R end of an RS trigger circuit; the output signals processed by the lower screening circuit and the peak position detection circuit are respectively inputted to the input end of a gate circuit; the anticoincidence signals outputted by the RS trigger circuit and the coincidence signals outputted by the gate circuit are respectively inputted to an anticoincidence shaping circuit; the anticoincidence shaping circuit outputs counting signals. No manual dead time is introduced, the system dead time of the single channel pulse height analyzer is greatly reduced, the counting rate is improved, the structure of the circuit is simple, and the single channel pulse height analyzer can be suitable for detecting output signals of a nuclear radiation detector in common use.
Owner:NANHUA UNIV
Radiation detector and detection method having reduced polarization
ActiveUS20100116998A1Improved energy resolutionEasy to detectSolid-state devicesMaterial analysis by optical meansHigh fluxRadiation
A direct conversion radiation detector includes a detector body made from a direct conversion material, a plurality of segmented electrode members operatively coupled to a radiation-receiving side of the detector body and at least one electrode operatively coupled to a second side of the detector body. The radiation detector is configured such that received radiation is incident on the segmented electrode members. The radiation detector provides reduced polarization effects for a variety of high flux radiation detection applications.
Owner:MULTI DIMENSIONAL IMAGING
Simplified digital corresponding Doppler broadening spectrum machine
InactiveCN103257357AImproved energy resolutionIncrease count rateX-ray spectral distribution measurementDoppler broadeningEngineering
Owner:TAIYUAN UNIV OF TECH
Determination method and device of coincidence events
The invention provides a detection method and device of coincidence events. The method comprises steps of successively receiving single event time acquired in each time slice; splicing the single event time acquired in the initial time segment of the latter time slice in adjacent two time slices with the single event time in the former time slice and carry out coincidence determination; and if thetwo single event time are arranged in the former time slice and the latter time slice respectively and the time intervals of the two single event time are in a coincidence time window, determining that the single events corresponding to the two single event time are coincidence events. According to the invention, loss of coincidence events of cross time slices is avoided and the counting rate oftrue coincidence events is improved.
Owner:NEUSOFT MEDICAL SYST CO LTD
Positive electron annihilation angle correlation spectrometer
ActiveCN102967874AShorten test timeIncrease count rateX-ray spectral distribution measurementTested timeCoincidence
The embodiment of the invention discloses a positive electron annihilation angle correlation spectrometer. The positive electron annihilation angle correlation spectrometer comprises a radioactive source, a first detector module and a second detector module, a coincidence unit and a data processing unit, wherein positive electrons generated by the radioactive source enter a sample to be slowed down, diffused and finally annihilated to generate two gamma rays, wherein the generated gamma rays respectively enter two detectors; the first detector module and the second detector module are fixed detectors; a scintillator of the first detector module is a whole crystal; a scintillator of the second detector module comprises a plurality of crystal bars which are linearly arranged along the direction of a narrow slit; and different crystal bars correspond to different included angles theta. By the positive electron annihilation angle correlation spectrometer, angle scanning can be avoided and a one-dimensional angle correlation spectrum can be obtained directly, and thus all angles can be measured once, thereby reducing test time, effectively improving the counting rate and improving testing performance of the system.
Owner:INST OF HIGH ENERGY PHYSICS CHINESE ACADEMY OF SCI
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