112 results about "Dose rate" patented technology

The invention discloses a method and a system for determining optimal parameters of an X-ray excited extra-high voltage composite apparatus, and relates to the technical field of extra-high voltage electrical equipment detection. The method comprises the following steps: remotely operating the X-ray machine and calculating partial discharge intensity; for the current irradiation position, the tube voltage and the tube current are gradually adjusted, parameters are dynamically optimized based on the quantitative relation between the partial discharge intensity and the radiation dose rate change rate, and the optimal parameters are recorded; and changing position repetition parameter optimization, and constructing a BP neural network model after data set training optimization so as to predict an optimal irradiation position. The optimized BP neural network adopts an improved sparrow search algorithm to optimize an initial weight and a threshold value, and combines Bayesian to optimize a learning rate and a hidden node number. Accurate optimization of excitation parameters and irradiation positions is achieved, detection accuracy and safety are both considered, the optimal irradiation position positioning efficiency is improved, and the method is suitable for ultra-high voltage GIS detection of different voltage grades.

The invention discloses a three-dimensional radiation field construction method and system, and the method comprises the steps: firstly obtaining an actual three-dimensional coordinate parameter set and an actual radiation dose rate parameter set of a to-be-measured scene, constructing a standard covariance matrix according to the parameters, selecting a to-be-predicted point, generating an actual covariance vector for the to-be-predicted point, and carrying out the calculation of the actual covariance vector. Generating predicted radiation dose rate parameters based on the standard covariance matrix and the actual covariance vector, and collecting the predicted radiation dose rate parameters of the plurality of points to be predicted into a predicted radiation dose rate parameter set, and finally, generating a three-dimensional radiation field according to the actual three-dimensional coordinate parameter set, the actual radiation dose rate parameter set and the predicted radiation dose rate parameter set. According to the method, the correlation between the trajectory points is represented through the covariance, and the conversion relation between the to-be-predicted point and each trajectory point is established through the conversion relation between the actual covariance vector and the standard covariance matrix, so that the radiation dose rate of the predicted point is calculated, the radiation dose rate of more point positions is obtained, and the precision of the three-dimensional radiation field is improved.

A Flash beam dose control method and a related device. The Flash beam dose control method comprises: obtaining a Flash beam output dose demand; controlling, by means of a Flash tuning mode, the number of pulse periods of output beam charges within a preset time; and / or controlling the pulse width of an ion source voltage by means of a pulse width mapping curve, so as to control a Flash beam output dose rate. By precisely controlling the number of pulse periods of output beam charges and the pulse width of the ion source voltage, the Flash beam output dose rate can be precisely controlled without requiring an additional shielding function for a proton therapy room, so that the dose of Flash can also be tuned in a conventional proton therapy room, thereby facilitating implementation of particle Flash radiotherapy.

The invention discloses a convolutional neural network and multi-source data fusion-based nuclear radiation on-line monitoring method, which comprises the following steps of: acquiring laser radar point cloud data, a radiation dose rate and a radiation image of a monitoring area by adopting an unmanned aerial vehicle, and de-noising the radiation image by adopting a double-branch convolutional neural network; determining the track position of the unmanned aerial vehicle according to the laser radar point cloud and the de-noised image; performing space-time registration on the radiation dose rate and the track position of the unmanned aerial vehicle to form a data set, and obtaining a continuous radiation field of the monitoring area by adopting Kriging interpolation; according to the continuous radiation field, an L-BFGS-B algorithm is adopted to carry out minimization solution on a loss function with the radiation source position as an optimization variable, and position coordinates of the radiation source are obtained; performing data cleaning on the radiation dose in the continuous radiation field, and then performing multi-dimensional feature extraction to obtain a feature vector; and inputting the feature vectors into a plurality of prediction models to obtain a plurality of predicted radiation doses, and carrying out weighted fusion to obtain a predicted dose rate of the radiation source.

The invention discloses an aviation radiation dose global distribution real-time calculation system based on ground detection equipment, which belongs to the technical field of radiation detection and comprises a ground radiation detection module, a dose simulation module and a data correction module. The ground radiation detection module is used for continuously collecting ionizing radiation data of an atmospheric bottom layer in a calm state and a solar high-energy particle event so as to improve data precision and a signal-to-noise ratio under a weak dose, and the dose simulation module receives latitude and longitude, height and time parameters of an aviation flight path, and calculates a standard atmospheric model and a cosmic ray energy spectrum in combination with the standard atmospheric model and the cosmic ray energy spectrum. The data processing module is used for calculating theoretical dose rates and particle type distribution of different height levels based on a Monte Carlo method and outputting the theoretical dose rates and the particle type distribution, and the data correction module is used for dynamically correcting parameters and weights of simulation results by combining measured data based on a deep learning algorithm of deep learning, so that adaptive fusion of the simulation data and the measured data is realized; and the ground radiation detection module comprises a semiconductor radiation detector, a data acquisition and preprocessing unit, a remote control module and a network communication module. The system has the characteristics of high real-time performance and wide coverage range.

The present disclosure provides a calibration device for a super high dose rate radiation device comprising a plurality of beam modules for emitting a plurality of radiation beamlets, the calibration device comprising: a calibration target assembly comprising a target portion, wherein the target portion is located at a predetermined radiation region of the super high dose rate radiation device during a calibration process; wherein the target portion is used as a reference to calibrate a convergence deviation of the plurality of radiation beamlets converging at the predetermined radiation region. A calibration method and a super high dose rate radiation device are also provided.

The invention discloses an accurate X-ray radiation dose measurement system based on artificial intelligence, which comprises the following steps: acquiring CT image data of a patient and pulse irradiation parameters of radiotherapy equipment through terminal equipment, and calculating a patient specific anatomical structure dynamic influence factor set, a pulse waveform time domain characteristic factor and a tissue interface scattering correction factor; all the parameters are substituted into a dose measurement formula to obtain an accurate X-ray radiation dose value; through a deep fusion image recognition technology (such as a high-resolution anatomical structure, tissue density gradient and heterogeneous region distribution provided by CT / MRI), a secondary particle scattering effect of a junction region of a tumor and a normal tissue can be accurately represented; and dynamic anatomical information (such as respiratory movement and organ displacement) in the image is combined to correct the time characteristic (such as dynamic change under an instantaneous high dose rate) of the pulse radiation field in real time, so that the dose calculation accuracy of a fast algorithm in a complex scene is remarkably improved.

The invention relates to the field of post-accident gamma dose rate measurement, and provides a post-accident gamma dose rate dynamic measurement method and system based on multi-detector fusion, and the method comprises the steps: obtaining original signal data and environment parameter data; processing the original signal data, the environmental parameter data, the accumulated radiation dose and the displacement damage energy by adopting a deep learning network to obtain corrected signal data; processing the correction signal data and the environmental parameter data through a time sequence prediction network to obtain a dynamic weight distribution result of each detector; processing the correction signal data and the dynamic weight distribution result based on a self-calibration confidence evaluation network to obtain a confidence evaluation result; and processing the correction signal data, the dynamic weight distribution result and the confidence evaluation result through a weighted fusion algorithm to obtain a dynamic measurement result of the gamma dose rate after the accident. According to the invention, high-precision dynamic measurement, real-time damage compensation and nuclear safety level reliability evaluation of the gamma dose rate after an accident are realized.

The invention relates to the field of semiconductor device and integrated circuit research, in particular to a semiconductor device dose rate effect laser simulation system. Multiple wavelengths and a wide energy range are achieved through the optical fiber laser pulse seed source assembly and the solid laser amplifier assembly, the pulse width can range from 1 ns to 100 microseconds, variable complex waveforms such as square waves, rectangular waves, sine waves and pulse strings are achieved, and pulse laser with the energy range from the nanojoule level to the joule level and adjustable wavelengths and waveforms can be output according to requirements. The high-low energy laser adopts a common-path design, so that the system integration degree is improved; light spots are adjustable from centimeter level to micron level, and global irradiation and micro-area positioning and scanning of an irradiation sample can be realized. According to the invention, dose rate effects under different conditions can be accurately and flexibly simulated, the blank of a high-energy, variable-waveform and multi-wavelength dose rate effect laser simulation system is filled up, and an efficient solution is provided for the reliability research of devices under a complex irradiation environment.

The invention discloses a radiation monitoring method and gate-type radiation monitoring equipment, and relates to the technical field of radiation monitoring. The method comprises the following steps: performing pulse analysis processing on a real-time gamma ray pulse signal to obtain a real-time net counting rate and a pulse PSD distribution histogram; determining a compensation coefficient according to the environmental data, and performing real-time compensation on the real-time net counting rate to obtain a compensated real-time net counting rate; performing compensation counting rate calculation according to the reference parameter, the compensated real-time net counting rate and the pulse PSD distribution histogram to obtain a compensation counting rate; and determining a target alarm type according to the compensation counting rate, the real-time net counting rate and a preset alarm condition corresponding to each alarm type, and performing alarm control according to an alarm mode corresponding to the target alarm type. Compared with the prior art, the method does not depend on single dose rate measurement or total count rate analysis, at the moment, it can be guaranteed that detection is more accurate, the method is not affected by environmental fluctuation any more, and then the problems of frequent false alarms and the high false alarm rate can be solved.

The invention relates to a method for radiation detection chip angle response compensation. The method comprises the following steps: step 1, testing the counting rate of deposition of each channel of array SiPM when gamma rays have different incident angles; 2, according to a standard dose rate value and the counting rate of each channel of the array type SiPM at different incident angles obtained in the step 1, constructing a linear equation set; 3, solving the system of linear equations in the step 2 to obtain an angle response correction matrix; and 4, correcting the angle response of the chip according to the angle response correction matrix in the step 3. According to the invention, the angle response compensation of the thin-layer scintillator radiation detection chip on the directional dose rate of different incident angles is realized, and the problem of measurement deviation of the radiation detection chip caused by the change of the incident angle of the radiation source is solved.

The invention discloses a calorimeter and method for FLASH radiotherapy rays. The calorimeter comprises a calorimetric core, a jacket layer and a shielding layer. The calorimetric core is an absorber of FLASH radiotherapy rays, and the calorimetric core is nested in a first space in the jacket layer in a manner that a first interval exists between the calorimetric core and the jacket layer and the calorimetric core and the jacket layer are not in contact with each other; the jacket layer is nested in a second space in the shielding layer in a manner that the jacket layer and the shielding layer have a second interval and are not in contact with each other; no non-gas filler exists in the first interval and the second interval. Through the arrangement, the calorimeter aims to meet the strict requirements of ultrahigh dose rate and millisecond irradiation of FLASH radiotherapy rays, the defects that solid filler hinders heat transfer and increases heat capacity in the prior art are overcome, through the design that three layers do not make contact with each other and are free of solid filling, heat loss and heat conduction lag are reduced, heat is concentrated on the calorimetric core, and the heat loss is reduced. Meanwhile, the overall heat capacity is reduced, the millisecond-level thermal response speed is guaranteed, and high accuracy and traceability of dose measurement are guaranteed.

The application provides a method and device for monitoring the dose of an X-ray machine, the method comprising: obtaining a functional relationship between the dose rate of the X-ray machine at a preset detection position and the exposure parameter of the X-ray machine when the X-ray machine operates at a preset frame rate; calculating the dose rate at a target detection position when the X-ray machine operates at a target frame rate and a target exposure parameter according to the functional relationship, the distance between the preset detection position and the target detection position relative to the focal point of the X-ray machine tube; calculating the cumulative dose of the X-ray machine at the target detection position according to the dose rate and the exposure time of the X-ray machine; and calculating the cumulative dose-area product of the X-ray machine according to the cumulative dose and the field area of the X-ray machine at the target detection position. The method and device for monitoring the dose of the X-ray machine can realize accurate measurement of the dose rate, cumulative dose and cumulative dose-area product of the X-ray machine through software, can balance low cost and high accuracy dose monitoring, and has a wide range of applications.

The invention relates to the technical field of radiation identification, and provides a personal dosimeter abnormal radiation identification method and system based on a time sequence LSTM, and the method comprises the steps: carrying out the abnormal value filtering, denoising and feature transformation processing of original dose rate data and environment parameter data collected by a personal dosimeter, and obtaining multi-dimensional time sequence feature data; inputting the multi-dimensional time sequence characteristic data into a long short-term memory neural network model for reasoning processing to obtain abnormal probability data reflecting the current radiation state; based on the abnormal probability data and the current environment background parameters, obtaining abnormal probability discrimination data through adaptive threshold dynamic adjustment; and performing multi-stage judgment processing on the abnormal probability judgment data to obtain an abnormal radiation identification result. According to the method, the false alarm rate caused by environment background fluctuation and the omission ratio of weak abnormal signals are reduced, and the progressive abnormity and the sudden abnormity are accurately recognized.

The application discloses a kind of point kernel integration calculation model efficient modeling method based on scene three-dimensional model, comprising: the three-dimensional modeling program is imported to nuclear facility scene three-dimensional model and the object to be modeled is split;For shielding type object, the shielding calculation model is obtained by copying on the basis of the three-dimensional model, the shielding calculation model is named, until the processing of all shielding type objects is completed;Determine the position of radioactive source term, when there is radiation field measured data, establish the quantitative mapping of dose rate and color, convert measured data into corresponding spatial position color ball-shaped measuring point to assist positioning;Source term calculation model is established by copying at the source term position and write material, nuclide and activity information;The parameters of the shielding calculation model and the source term calculation model are extracted by secondary development script and basic body information extraction algorithm;The parameters are stored according to point kernel integration calculation program input card format, and the point kernel integration calculation model for γ radiation field calculation is obtained.

A radiotherapy planning apparatus includes processing circuitry. The processing circuitry obtains a medical image relating to a patient. The processing circuitry obtains number of beams and beam directions of a plurality of radiation beams applied substantially simultaneously to an irradiation area of the patient. The processing circuitry generates a total dose rate distribution which is a spatial distribution of total values of predicted dose rates of the radiation beams to be applied to the patient, based on the medical image and the number and the direction of the radiation beams.

The application relates to a ratio type radiation sensing device with nonlinear response to dose rate and a use method thereof, and relates to a scintillator radiation measuring device with nonlinear change of luminous intensity and use method, and aims to solve the technical problems of low measuring precision, complex structure, poor reliability, poor real-time performance and poor applicability of existing radiation sensors. The ratio type radiation sensing device with nonlinear response to dose rate comprises an X-ray excitation module, a mixed sensing probe and a light signal collection module; wherein the mixed sensing probe is a round piece pressed by uniformly mixing NaLuF4:3Pr,5Er nanocrystals and NaLuF4:3Ce nanocrystals. The use method of the device is a standard curve method. The device can realize accurate detection in a wide range of 1.86-14.95 mGy / s, and can be used in the fields of environmental monitoring, biomedical imaging and public security inspection.

This invention belongs to the field of radiation mutagenesis technology, and relates to a method for mutagenesis of lavender seeds, employing... 60 Lavender seeds are treated with Co-γ rays; the radiation dose is 50-500 Gy, and the dose rate is 1-3 Gy / min. This invention employs... 60 Radiation with Co-γ rays can efficiently induce mutations in the genetic material of lavender seeds, effectively breaking gene linkage and significantly increasing the mutation frequency. This provides a rich material basis for screening lavender mutants, allowing for the selection of seed half-lethal doses, and obtaining plants with variations in leaf color, leaf shape, plant height, and other traits. This provides technical support for lavender breeding using radiation mutagenesis technology.

The invention belongs to the technical field of dosimeter calibration, and aims at solving the problems that a traditional dosimeter calibration method depends on manual operation, multi-test-point switching, data recording and off-line calculation need to be completed in a cesium source radiation field, efficiency is low, and test errors are likely to be introduced. According to the dosimeter intelligent calibration method and system based on the multi-modal algorithm, by designing a dual algorithm architecture of a measurement counting mode and an automatic scale mode, autonomous calculation of a gain correction factor and a background correction factor of a dosimeter is achieved, dose accumulation is monitored and stored in real time, and the accuracy of calibration is improved. Through a dynamic switching mechanism of external clock counting and port interruption counting, the stability of a radiation field is accurately judged, the sequential control precision of data acquisition is ensured, real-time calculation and storage of accumulated dose in a multi-gradient dose rate field are realized, and the continuity and traceability of calibration data are ensured. Through full-closed-loop automatic design, the problems of timing error, data input deviation and flow redundancy caused by manual operation are thoroughly eliminated.

An x-ray irradiation system includes a first x-ray tube constructed and arranged to be able to irradiate an object with at least a portion of a first x-ray beam emitted from the first x-ray tube, and a second x-ray tube constructed and arranged to be able to irradiate the object with at least a portion of a second x-ray beam emitted from said second x-ray tube simultaneously with said first x-ray beam. The first and second x-ray tubes are arranged such that the first and second x-ray beams are incident on, and intersect within, the object at respective first and second oblique angles to define a target volume such that a dose rate is substantially uniform as prescribed within said target volume.

The embodiment of the invention provides a method for determining the output beam intensity of a standing wave accelerating tube, and the method comprises the steps: building a target digital model corresponding to a target assembly, determining a simulated electron beam energy value according to a theoretical electron beam energy value emitted by the standing wave accelerating tube, and enabling simulated electrons to irradiate the target digital model according to the simulated electron beam energy value, calculating to obtain a first mapping relation between the unit X-ray dose rate of the first position and the simulated electron beam energy value; acquiring an actual electron beam energy value emitted by the standing wave accelerating tube and measuring an actual X-ray dose rate of the second position; and obtaining an actual unit X-ray dose rate according to the actual electron beam energy value and the first mapping relation, and calculating the ratio of the actual X-ray dose rate to the actual unit X-ray dose rate to obtain the beam intensity. According to the determination method in the embodiment of the invention, the influence of the material and structural characteristics of the target assembly on the X-ray dose rate is considered, the calculation precision of the beam intensity is improved, and a more accurate reference basis is provided for the design and debugging of the standing wave accelerating tube.

The invention discloses a wide-range gamma critical detector and a detection method, and the detector comprises a composite probe which carries out the region and critical radiation detection and self-inspection under the control of a signal processing system, and outputs a region signal and a critical signal corresponding to the region and critical gamma dose rate of an environment where the composite probe is located; the signal processing system is used for providing corresponding working voltage and self-checking control for the composite probe, performing data conversion and counting acquisition on the regional signal and the critical signal, and outputting a regional radiation detection result and a critical radiation detection result; and identifying and judging the critical radiation detection result based on a preset alarm threshold value, and selecting to output a corresponding alarm signal when the critical radiation detection result exceeds the alarm threshold value. According to the invention, the composite probe is utilized to detect the regional and critical radiation in the environment at the same time, the measurement range is widened, two alarm signals are selectively output according to the preset alarm threshold, the missing report rate and the false alarm rate of critical alarm are greatly reduced, the reliability and the stability are enhanced, and the alarm response speed is extremely high.

The invention discloses a neutron-gamma dosimeter based on double detectors and a gamma and neutron dose rate detection method, the neutron-gamma dosimeter comprises a gamma detector, a neutron-gamma detector and a processing module, the gamma detector can only respond to gamma rays and output signals, and the neutron-gamma dosimeter can only respond to the gamma rays and output signals. The neutron-gamma detector can respond to neutrons and gamma rays and output signals, and the processing module can receive the signals of the gamma detector and the neutron-gamma detector, determine the gamma dose rate based on the output signals of the gamma detector, and determine the dose rate of the neutron-gamma detector based on the difference value of the output signals of the gamma detector and the neutron-gamma detector. And determining the neutron dose rate. According to the invention, through combination of the gamma detector and the neutron gamma detector, simultaneous monitoring and dose separation of neutrons and gamma rays are realized, doses of two radiation types can be accurately measured and distinguished, and use requirements in various complex environments are met.

The utility model discloses a Co-60 medium-release wastewater transportation shielding structure which comprises an outer shell, a cover plate is arranged at the top of the outer shell, a supporting base is arranged at the bottom of the outer shell, an inner layer which is integrally connected is arranged in the outer shell, frames are arranged between the outer shell and the inner layer respectively, and arc-shaped modules are arranged on the inner sides of the frames. According to the utility model, through the layered shielding design of the housing and the inner layer, the dose rate is accurately controlled; the arc-shaped modules are modularly combined into a lead alloy structure, so that the maintenance cost is reduced; by means of modular splicing of the arc-shaped modules, seam treatment is optimized, and direct leakage is reduced; and the thermal expansion safety margin requirement under the filling rate of 90% is met.

The invention relates to the field of gamma dose rate monitoring, and provides a gamma dose rate monitoring method and device based on eight SiPINs, and the method comprises the steps: collecting pulse signals outputted by eight SiPIN detectors, inputting the pulse signals into a self-adaptive time domain convolutional neural network of an index attenuation response function of the SiPIN detectors, and obtaining a stacked pulse feature vector; processing the stacked pulse feature vector by adopting a multi-path synchronous constraint loss function to obtain pulse arrival time, pulse amplitude and confidence coefficient parameters; constructing node features of the graph neural network based on the pulse arrival time, the pulse amplitude and the confidence coefficient parameter, and performing fusion calculation processing on the node features through the graph neural network to obtain a gamma dose rate measurement value; and comparing the gamma dose rate measurement value with a preset gamma dose rate threshold value, generating a corresponding monitoring state identifier according to a comparison result, and obtaining a gamma dose rate monitoring result. According to the invention, high-sensitivity real-time monitoring, dynamic pulse accumulation processing and grading state early warning of the gamma dose rate are realized.

A graphical user interface (GUI) that includes a representation of a target volume and sub-volumes of the target volume is rendered and displayed. Information in computer system memory that includes a dose rate received by each sub-volume is accessed. A value of an attribute is associated with each sub-volume, where the value corresponds to an amount of the dose rate received by that sub-volume. Each sub-volume is then rendered according to that value. The GUI may include a dose rate-volume histogram and / or an irradiation time-volume histogram for the target volume.

The application provides a signal processing method for a radioactivity detection device and the radioactivity detection device. The signal processing method for the radioactivity detection device comprises the following steps: analyzing a collected nuclear pulse signal to obtain pulse amplitude information; performing spectrum stabilization according to the pulse amplitude information to obtain a stabilized spectrum; and determining a nuclide identification result and a dose rate calculation result based on the stabilized spectrum. The technical scheme of the embodiment of the application can determine the current environmental dose rate level, ensure that the radiation dose received by the staff is within the safety limit, thereby reducing the radiation risk and protecting the health and safety of the staff. In addition, the specific radioactive nuclide can be identified, thereby helping to determine the pollution source.

The invention discloses a product irradiation monitoring system and method, and relates to the field of product monitoring. The system comprises an irradiation source device, a product conveying device and an environment monitoring unit, and real-time correction is carried out by constructing a voxelization three-dimensional dose rate grid and combining source activity decay and air density parameters; a path integration algorithm is used to calculate a dynamic accumulated dose according to the instantaneous position and speed of the product, and the transmission frequency is adjusted in a closed-loop manner. The system is also integrated with a non-contact dose verification unit based on passive RFID for model calibration, and an excessive radiation estimation and automatic source reduction protection mechanism for a card chain fault. According to the invention, through multi-dimensional environment perception and dynamic integral calculation, the problems of low dose control precision and lack of real-time feedback in traditional irradiation processing are effectively solved, and the stability and safety of product irradiation quality are ensured.

A method including configuring a transmission electron microscope according to first acquisition settings that comprise at least one of a first dose rate or a first operating mode. The method further including operating, during a first time period, the electron microscope to image a radiation-sensitive sample in accordance with the first acquisition settings. The method further including, after the first time period, configuring the electron microscope according to second acquisition settings that comprise at least one of a second dose rate different than the first dose rate or a second operating mode different than the first operating mode. The method further including operating, during a second time period, the electron microscope to image the radiation-sensitive sample in accordance with the second acquisition settings. The method further including generating image data based on first data and second data respectively collected during the first time period and the second time period

The invention relates to a bipolar transistor low dose rate effect on-orbit test circuit and method, the test circuit comprises a tested device circuit, a feedback regulation circuit, a voltage follower circuit and a differential acquisition circuit, the tested device circuit is used for detecting the base current of a tested bipolar transistor so as to verify the low dose rate enhancement effect of the bipolar transistor; the feedback adjusting circuit is connected with the base electrode of the tested device and is used for dynamically adjusting the base electrode voltage of the bipolar transistor and ensuring that the collector electrode voltage in the test condition is not changed; the voltage following circuit is connected with a base electrode of a tested device and is used for increasing input impedance of a tested device circuit and improving acquisition precision of base electrode current of the tested device. The differential acquisition circuit is connected with the voltage follower circuit and has a function of converting a voltage signal into a differential signal, so that an acquired base current value can be calculated. Technical support is provided for follow-up analysis of the space radiation low-dose rate effect mechanism of the bipolar transistor.