773results about "Radiation measurement" patented technology

The invention relates to the technical field of radiation measurement, in particular to a radiation data calibration method for a regional radiation monitor, which comprises the following steps of: according to the variation trend of data in a local range of each moment in a radiation slope sequence of each position and the difference of time intervals between all adjacent extreme points in a radiation data curve, calculating the radiation data of the regional radiation monitor; obtaining the interference degree of the radiation data at each moment of each position; according to the correlation degree between the radiation data sequence of each position and the radiation data sequence of other positions and the interference degree, the corrected interference degree of the radiation data of each moment of each position is obtained; and correcting the radiation data of all positions at each moment according to the distribution of the radiation data of all positions at each moment in the region and the corrected interference degree to obtain the radiation data after region calibration. According to the invention, the accuracy of regional radiation data monitoring is improved.

The invention relates to the technical field of particle detectors, in particular to a signal acquisition, processing and analysis method and system for a particle detector array, and the method comprises the following steps: segmenting a channel amplitude, marking a stable segment by using a range ratio threshold value, calculating a difference ratio, screening monotonically rising channel marking transition, extracting an earliest excitation channel as a starting point, and carrying out signal processing. And retrieving adjacent channel screening time differences in the window as candidates, and taking the channel with the angle change smaller than a threshold value as a trunk section according to time sequence to generate a path structure. According to the method, the amplitude range of a channel in a fixed period is extracted, a stable signal segment is screened, preliminary signal structuring is completed, a rising trend channel is identified through a difference ratio, the first excitation time is extracted to establish a space starting point index, and path candidates are screened in combination with the time difference of adjacent channels and states. Path trunk segments consistent in direction are extracted through angle change analysis, particle path reconstruction is achieved, multi-dimensional parameters synergistically improve the recognition precision, the analysis capability is enhanced, and the misjudgment rate is reduced.

The invention relates to the technical field of plasma surface particle flow detection, and discloses a plasma surface particle flow detection probe, which comprises a base, the base is provided with a first mounting hole penetrating from the top surface to the bottom surface, the base is internally provided with a first cooling cavity, the first cooling cavity is used for introducing a cooling medium, and the first cooling cavity is communicated with the first mounting hole; the insulating sleeve is inserted into the first mounting hole; the probe column is inserted into the insulating sleeve, one end of the probe column is provided with a probe head used for being in contact with plasma, and the probe column is connected with a wire. According to the plasma surface particle flow detection probe provided by the invention, heat flow deposited in the probe can be quickly removed, the service life is prolonged, and detection can be carried out for a longer time.

The invention relates to an automatic calibration method and system for an ionizing radiation instrument, a storage medium and electronic equipment, and the method comprises the following steps: obtaining image information of the radiation instrument through an intelligent camera, carrying out the recognition based on the image information, and obtaining a tag number of the radiation instrument; performing image acquisition and image recognition on the radiation instrument in the verification process of the radiation instrument to obtain instrument data; analyzing and calculating the instrument data to obtain a data processing result; and generating an instrument calibration certificate and an original record based on the data processing result and the instrument data. The data of the radiation instrument can be automatically identified and grabbed, the original record and the instrument calibration certificate can be automatically generated, the data accuracy, the data consistency and the traceability are improved, meanwhile, human factors are reduced, human resources are saved, and the cost is greatly reduced.

The invention provides a calibration method and device for beam position measurement of a linear accelerator, and the device comprises a reference signal processing module which obtains real-time temperature and humidity values, receives multi-channel beams and reference signals, adjusts a trigger signal reflecting the time delay between the reference signals and the beam signals, and outputs a recombination signal of each beam and reference signal; a digital signal processing module of the beam signal processing electronics part comprises a sampling circuit for sampling to obtain a digital signal; the amplitude calculation unit is used for extracting the amplitudes of the beam and the reference signal; and the position calculation unit is used for solving the optimal amplitude change coefficient of the reference signal according to the real-time temperature and humidity values, correcting the amplitude of the reference signal by using the coefficient, calibrating the amplitude of the beam signal by using the correction result, and finally obtaining the beam position. According to the calibration equipment, the influence of channel inconsistency and temperature drift and long drift on position measurement can be effectively suppressed, and the position resolution and long-term operation stability of beam measurement are improved.

The invention relates to the technical field of radiation monitoring, in particular to a radioactive foam height nuclear monitoring system and a use method. A radioactive foam height nuclear monitoring system comprises an ionization chamber detector; the collimation shielding module is provided with a containing space, the ionization chamber detector is contained in the containing space, the collimation shielding module is provided with a collimation hole, and particles generated by the self-radiation source can pass through the collimation hole. The invention provides a radioactive foam height nuclear monitoring system and a use method, and aims to solve the problem that a conventional radiation detector is difficult to bear an extremely high radiation environment and affects the detection precision.

The invention relates to a multi-dimensional transformation device for debugging an SPECT detector, the multi-dimensional transformation device comprises a supporting unit, a rotating unit and a detector fixing unit, the supporting unit comprises a base and at least one vertical supporting column, and the supporting column is used for supporting the detector fixing unit; the rotating unit is connected between the top of the supporting column and the detector fixing unit and used for rotating the detector fixing unit. The detector fixing unit comprises a fixing frame, the detector is installed in the fixing frame, the detector can rotate along with the detector fixing unit, and multi-angle detector debugging is facilitated.

The embodiment of the invention provides a delayed neutron monitor calibration device and calibration method, and a delayed neutron monitor calibration device. The first beam intensity detection device comprises a penetration type ionization chamber, the penetration type ionization chamber is arranged between the delayed neutron calibration source and the accelerator along the emission direction of the beam, and the penetration type ionization chamber is arranged close to an emission port of the accelerator, so that the beam passes through the penetration type ionization chamber; the second beam intensity detection device comprises a finger-type ionization chamber, the finger-type ionization chamber is arranged between the delayed neutron calibration source and the accelerator in the beam emitting direction, the finger-type ionization chamber is arranged close to the first channel, and the finger-type ionization chamber can move in the first direction. According to the delayed neutron monitor calibration device provided by the embodiment of the invention, accurate calibration of the delayed neutron calibration source in the beam field can be realized, the stability and efficiency of beam irradiation are improved, and the calibration precision of the delayed neutron monitor is further improved.

The invention provides a batch calibration method and device based on a GE function, and relates to the field of radiation detection. The method comprises the following steps: performing energy calibration on target to-be-detected equipment according to a preset acquisition mode under a standard source, and obtaining first energy spectrum data corresponding to the target to-be-detected equipment based on the energy calibration; performing dead time correction operation on the first energy spectrum data; inputting the first energy spectrum data after the dead time correction into a GE energy spectrum correction model, and outputting second energy spectrum correction data based on the GE energy spectrum correction model; integrating the second energy spectrum correction data based on a polynomial weight function to calculate a dose rate corresponding to the target to-be-detected equipment; and on the basis of the corresponding dosage rate of the to-be-detected equipment, carrying out batch calibration on the plurality of to-be-detected equipment. The problem that the whole calibration process consumes a large amount of time due to the fact that data collection, analysis and calculation of GE function parameters are needed for multiple times in the calibration process of a traditional radiation calibration method is solved.

The invention relates to the technical field of ionization radiation detection, in particular to an ionization chamber detection device, a measurement system and a use method. An ionization chamber detection device comprises: a housing having an accommodation space in which a mixed reaction gas is accommodated; the at least one separating polar plate is arranged in the accommodating space, and the separating polar plate is used for separating the accommodating space into at least two sections of detection cavities; the at least two signal collecting polar plates are respectively arranged in different detection chambers; and the at least two signal transmission lines are respectively connected with different signal collecting polar plates, one end of each signal transmission line is connected with the signal collecting polar plate, and the other end of each signal transmission line extends out of the shell and is suitable for being connected with a data collecting and processing unit. The invention provides an ionization chamber detection device, a measurement system and a use method, and aims to solve the problem that a conventional ionization chamber is generally used for intensity and dose measurement of regional radiation and is not suitable for position sensitive detection of a space smaller than the sensitive volume of the ionization chamber.

The invention discloses a dynamic paper feeding control method for double-probe aerosol monitoring, and relates to the field of environmental monitoring instrument manufacturing. The method comprises the following steps: acquiring a currently set paper feeding mode of the aerosol detection device, and performing paper feeding control on filter paper of the aerosol detection device according to a filter paper target displacement corresponding to the paper feeding mode; acquiring a corresponding real-time accumulated pulse number after the aerosol detection device starts paper feeding control, and stopping paper feeding when a paper feeding stopping condition is met; acquiring the perimeter of the positioning shaft and the number of pulses per circle; real-time displacement is determined according to the perimeter of the positioning shaft, the number of pulses in each circle and the number of real-time accumulated pulses; and correcting the real-time displacement according to the target displacement of the filter paper, and dynamically controlling the filter paper of the aerosol detection device again according to the corrected real-time displacement. According to the invention, actual transportation positioning of the filter paper in different paper feeding modes is considered and correction is carried out, so that huge deviation of the detection efficiency of the monitor and serious distortion of a measurement energy spectrum can be avoided.

The invention provides a radiation detection method, device and equipment based on camera device acquisition and a medium. Comprising the following steps: performing video acquisition on to-be-detected objects on a conveyor belt through a camera device, analyzing the acquired video to obtain a plurality of differential images, and determining a target detection object with radiation in all the to-be-detected objects and first radiation information; dividing the target detection objects into a first type of detection objects and a second type of detection objects, and respectively transmitting the first type of detection objects and the second type of detection objects to different detection spaces; and performing radiation detection on the target detection object based on the radiation detection device, determining second radiation information of the first type of detection object and the second type of detection object, optimizing the first radiation information to obtain radiation information of the target detection object, determining a risk level, and sending alarm information based on the risk level. The first radiation information and the second radiation information of the target detection object are obtained in different modes, the radiation information is obtained, and the accuracy of the radiation information is ensured.

The invention belongs to the technical field of nuclear material retention volume analysis, and particularly relates to a retention volume acquisition method and device based on Monte Carlo simulation. The method comprises the following steps: according to Monte Carlo calculation requirements, obtaining physical geometric models of a to-be-detected process system and a detector, and completing material modeling; obtaining radiation parameters of retentate in the to-be-tested process system, and establishing a virtual source on the physical geometric model; on the basis of the physical geometric model, Monte Carlo simulation is adopted, and the response coefficient of the detector of the unit mass retentate at the target measurement position is obtained; and obtaining the retention volume of the target measurement position according to the neutron fluence measured by a detector and the response coefficient. The neutron detection efficiency calibration test and the correction analysis process are simplified, the reliability of the retention volume analysis result is improved, and important data are provided for nuclear material closing balance.

The invention discloses a miniature high-voltage module for a nuclear radiation detector. The miniature high-voltage module comprises a Boost chip circuit, a driving circuit and a voltage doubling rectifying circuit, the input end of the Boost chip circuit is connected with a power supply, the output end of the Boost chip circuit is connected with the driving circuit, and the Boost chip circuit is used for boosting the voltage input into the input end of the Boost chip circuit and outputting the boosted voltage to the driving circuit; the driving circuit is used for providing bidirectional current for the voltage doubling rectifying circuit based on the voltage output by the output end of the Boost chip circuit; and the voltage doubling rectifying circuit is used for amplifying the voltage output by the driving circuit and outputting a target voltage meeting the detection condition of the nuclear radiation detector. According to the module, the Boost chip circuit is adopted, the size of the miniature high-voltage module can be optimized, meanwhile, the miniature high-voltage module is additionally provided with the driving circuit, the requirement of some special detectors for large current is met, and the adaptation degree between the miniature high-voltage module and the nuclear radiation detector can be improved.

To provide a calibration device, medical imaging system and calibration method that allow an operator to easily acquire calibration data for a photon-counting detector.SOLUTION: A calibration device used to acquire calibration data for a photon-counting detector that outputs an electric signal corresponding to photon energy of an incident radiation, includes: a holding unit which holds a first basis material and a second basis material having a larger attenuation coefficient for the radiation than that of the first basis material; and a moving mechanism that moves each of the first basis material and the second basis material between a position inside an irradiation field and a position outside the irradiation field by moving the holding unit in a body axis direction of a subject to which the radiation is applied.SELECTED DRAWING: Figure 3

The invention relates to the technical field of underground collection devices, and particularly discloses a geothermal fluid radioactive sample sampling device which comprises a sampling barrel and an irrigation barrel arranged below the sampling barrel. An exhaust hole is formed in the top of the sampling barrel; an air inlet hole is formed in the middle section of the sampling barrel; a notch groove and a water inlet channel are formed in the bottom of the sampling barrel, a water inlet pipe communicated with the water inlet channel is arranged in the notch groove, and a first water inlet is formed in the outer edge surface of the water inlet pipe; the water inlet pipe penetrates through the upper section of the water filling barrel and is rotationally connected with the upper section of the water filling barrel, an outer pipe sleeve matched with the water inlet pipe is arranged on the upper section of the water filling barrel, and a second water inlet is formed in the outer pipe sleeve; when the irrigation cylinder stands still, the first water inlet and the second water inlet are closed in a staggered manner; and when the water filling cylinder is overturned, the first water inlet and the second water inlet are overlapped and communicated. The device has a better sampling function and self-closing performance, and the sampling safety is higher.

The invention provides a detector panel, a detector, a detector imaging method, a terminal and a medium, and the detector panel comprises a signal reading unit which is used for receiving a read signal and transmitting the read signal to an external processing unit; the signal receiving unit is used for receiving the detection signal and sending the detection signal to the signal reading unit; the interference receiving unit is used for receiving the interference signal and sending the interference signal to the signal reading unit; wherein the signal receiving units and the interference receiving units are arranged at intervals; the detection signal comprises a ray signal and an interference signal; the external processing unit subtracts the detection signal from the interference signal. The interference signal is received by the interference receiving unit, and the interference signal and the signal received by the signal receiving unit are subtracted to offset the interference signal, so that the interference resistance function of the detector is realized, the influence on the signal receiving unit to receive a ray signal is avoided, and a better imaging effect is achieved.

The utility model discloses a portable radiation protection monitoring device, which relates to the field of radiation protection monitoring and comprises a protection mechanism, a mounting groove is formed in the protection mechanism, and fixing mechanisms are fixedly mounted on the upper portion and the lower portion of the interior of the mounting groove. A monitor body located in the mounting groove is movably clamped to the inner side of the fixing mechanism, the protection mechanism comprises a fixing shell, and a cover plate is movably hinged to the lower portion of the outer side of the fixing shell. According to the utility model, the monitor body is mounted in the mounting groove in the protection mechanism through the arrangement of the protection mechanism, the exterior of the monitor body is shielded and protected through the protection mechanism, and when the monitor body accidentally falls off, the protection mechanism is located outside the monitor body for collision and energy absorption and buffering; therefore, the damage to the monitor body in the protection mechanism is reduced, and the monitor body is prevented from being damaged.

The invention relates to a radiation contamination simulation detection equipment control method based on an ultraviolet fluorescence signal, which is applied to radiation contamination simulation detection equipment, and the equipment comprises a detection probe. The method comprises the steps that a fluorescence intensity original signal and an ambient light interference signal of a target area are collected, the distance between a detection probe and a target surface is obtained, a fluorescence simulation agent is sprayed on the target area and irradiated by an ultraviolet LED lamp, and the simulation agent is used for emitting fluorescence with the wavelength larger than 450 nm under excitation of ultraviolet light; based on the distance and the ambient light interference signal, performing coupling compensation on the fluorescence intensity original signal; and calculating a radiation simulation value according to the calibration fluorescence intensity signal, and outputting information such as the radiation simulation value, the safety level and the component type. According to the method, through non-radiation simulation agent replacement, signal calibration and multi-dimensional analysis technical means, the safety of radiation detection training is improved, the health threat of a real radioactive source to trainees is eliminated, and the accuracy and the information amount of a detection result are remarkably improved.

The invention discloses a calibration method of photoelectron spectroscopy equipment, and relates to the field of semiconductors. The calibration method comprises the following steps: etching a film sample for the first time; carrying out X-ray bombardment on the etched film sample, and collecting a spectrogram; obtaining an etching thickness according to the current thickness of the etched film sample and the initial thickness of the film sample before etching; according to the etching thickness and the spectrogram, obtaining a relationship between the element content of the film sample and the etching depth so as to determine a first etching rate; etching the film sample with the determined first etching rate for the second time by adopting the same etching condition to obtain a second etching rate; when the first etching rate is the same as the second etching rate, it is judged that etching of the photoelectron spectroscopy equipment is stable, and the first etching rate or the second etching rate is determined as a reference etching rate; and when the first etching rate is different from the second etching rate, determining the second etching rate as a reference etching rate. The problems that an X-ray photoelectron spectrometer is stable in etching rate, poor in accuracy and the like can be solved.

The embodiment of the utility model provides a radiation detector module, a radiation detector and imaging equipment. The radiation detector module comprises a detector circuit board which is provided with a detector element for converting received rays emitted by a radiation source into electric signals, and the detector circuit board is provided with a first positioning hole; the collimator assembly is arranged on a transmission path of the rays and collimates the rays radiated to the detector element, and the collimator assembly is provided with a second positioning hole corresponding to the first positioning hole in position; and the frame supports the detector circuit board and the collimator assembly, the frame is provided with a positioning column, and the positioning column penetrates through the first positioning hole and the second positioning hole. According to the radiation detector module, the difficulty of alignment operation can be reduced, accumulation of alignment errors generated in multiple times of alignment operation is reduced, the alignment precision of all the components is improved, and then the detection precision of the radiation detector module is improved.

Systems and methods are provided for calibrating computed tomography (CT) system. In one example, a method for a computed tomography (CT) system comprises, during a calibration of the CT system, measuring a position of a detector element of a detector array of the CT system using a wire of a wire phantom coupled to a table of the CT system, during a rotational scan performed using the CT system; and during a subsequent scan performed on a subject using the CT system, applying the measured position of the detector element rather than a design target position of the detector element during reconstruction of an image from projection data acquired via the CT system; and displaying the reconstructed image on a display device of the CT system.

The invention relates to the technical field of data calibration, in particular to a neutron fluence response calibration method based on a neutron generator reference radiation field, and the method comprises the steps: collecting a counting rate and a neutron fluence rate at each moment in each monitoring period through a neutron detector and a neutron generator; data of each environmental parameter around the reference radiation field at each moment in each monitoring period are obtained; recording each monitoring period and a plurality of monitoring periods before the monitoring period as historical periods; determining the measurement error of each historical period; obtaining the measurement interference degree of each environmental parameter in each monitoring period; and calculating the scattering interference degree of each environmental parameter in each monitoring period to obtain a calibration counting rate, and carrying out real-time calibration on the neutron fluence response. According to the invention, the interference influence of different environmental factors on the measurement result of the neutron detector can be quantified through dynamic environmental changes, the measurement result of the neutron detector is calibrated in real time, and the measurement accuracy of neutron fluence response is improved.

The embodiment of the invention provides a delayed neutron calibration source and an activation method thereof. The delayed neutron calibration source comprises a shielding part, a containing device, a detector and an accelerator. A first containing cavity extending in the height direction and a first channel communicated with the first containing cavity are formed in the shielding part, and the shielding part is used for shielding radiation. The containing device is arranged in the first containing cavity and corresponds to the first channel, and the containing device is used for containing the reaction target piece. At least part of the detector is arranged in the first containing cavity and used for detecting the counting rate of neutrons in the first containing cavity. A beam emitted by the accelerator can pass through the first channel and irradiate the reaction target. According to the embodiment of the invention, the condition that a delayed neutron radiation field is generated by leakage in a water loop in the nuclear fission process can be simulated, and detection and calibration are facilitated. By controlling the beam intensity, the emissivity of delayed neutrons can be changed, and different neutron radiation fields can be simulated.

The invention relates to the technical field of nuclear radiation detection, and discloses a collimation adjustment device and a nuclear radiation detection device. According to the invention, the collimation adjusting device comprises a moving body arranged corresponding to a ray receiving hole, a plurality of radiation adjusting holes with different apertures are formed in the moving body in a penetrating manner, the moving body can move relative to the ray receiving hole, the radiation adjusting holes and the ray receiving hole are arranged correspondingly in the axial direction, and a nuclear radiation detection device is arranged on the moving body. Comprising a sample chamber and a detection chamber, a collimation hole is formed in the end, facing the detection chamber, of the sample chamber, a detector is arranged in the detection chamber, a ray receiving hole is formed in the end, facing the sample chamber, of the detector, and the collimation adjusting device is arranged between the sample chamber and the detection chamber. The radiation adjusting holes with different apertures correspond to the ray receiving holes in the axial direction, so that the convenience and the stability of the nuclear radiation detection device are improved, the measurement accuracy can be improved, and the measurement application range of the nuclear radiation detection device is widened.

The embodiment of the invention provides a method for establishing a ray digital twin reference radiation field. The method comprises the following steps: establishing a Monte Carlo model of a ray measurement standard reference radiation field; and establishing a neural network prediction model based on a deep neural network algorithm according to a simulation result of the Monte Carlo model. And acquiring the ray radiation dose rate of the specified coordinate point according to the neural network prediction model, and establishing a ray digital twin reference radiation field. According to the establishment method of the ray digital twin reference radiation field, the radiation dose rate prediction accuracy effect is good.

The invention discloses a muon imaging device, and relates to the technical field of particle detection, the muon imaging device comprises a time projection chamber, the time projection chamber is used for performing three-dimensional track reconstruction on cosmic ray muons incident into the time projection chamber, and an imaging function is realized by reconstructing flux distribution or scattering distribution of the cosmic ray muons; the muon imaging device disclosed by the invention is simple in structure, cost-saving and convenient to use.

The invention discloses a radon gas detector test method and related equipment, and the method comprises the steps: obtaining equipment parameters of a tested radon gas detector, and determining the first test concentration of the tested radon gas detector according to the equipment parameters; determining the test distance of the radon gas detector to be tested according to the first test concentration, wherein the first test concentration is in negative correlation with the test distance; controlling the distance between the americium 241 radioactive source and the detected radon gas detector to meet the test distance, and controlling the americium 241 radioactive source to be turned on; acquiring a plurality of first test data acquired by the signal transceiving module from the radon gas detector to be tested during the starting period of the americium 241 radioactive source, wherein the first test data are electric signal data corresponding to alpha particles generated by the americium 241 radioactive source; and determining a test result of the tested radon gas detector according to the plurality of first test data. By adopting the method provided by the invention, the problem of high detection cost caused by a radon source in a traditional detection method is solved.

The invention provides an electron irradiation dose real-time calibration management method and system, and relates to the technical field of data processing, and the method comprises the steps: collecting real-time dose original data at different positions, and carrying out the mapping processing of the real-time dose original data according to a transmission position and a time parameter, and forming a real-time dose matrix containing spatial distribution characteristics; comparing the dose value of each point location with a preset dose reference threshold value, and generating a dose deviation distribution diagram containing deviation magnitude and deviation position; identifying a local area of which the deviation exceeds a preset deviation threshold range, and generating abnormal dose batch information in combination with the product batch number; extracting a transmission speed parameter, a stacking thickness parameter and an irradiation power parameter of a corresponding batch of products to form a running state parameter set; executing hierarchical calibration processing; carrying out calibration verification processing; according to the invention, the autonomy and accuracy of real-time calibration of the electron irradiation dose are improved.

The invention relates to an irradiation dose intelligent monitoring control method for an irradiation process high-end electric wire, and the method comprises the following steps: S1, constructing a mapping relation between physical parameters and a target irradiation dose range based on the type and material data of the electric wire, and forming a parameter database; s2, collecting sensor data through a PLC (Programmable Logic Controller); s3, constructing a spatial distribution optimization model; s4, according to the spatial distribution optimization model, performing preliminary adjustment on the irradiation dose based on a PID algorithm to obtain a preliminary control strategy; s5, constructing a dose distribution prediction model based on the LSTM model, and predicting the future dose distribution in the irradiation path; and S6, cross-time and global range compensation control is carried out on the preliminary control strategy through sensor real-time data and an AI prediction result, and an optimal control strategy is obtained. According to the invention, the intelligence and accuracy of the irradiation process are comprehensively improved.