243 results about "Dose rate" patented technology

The invention provides a radiation field high-precision reconstruction method based on dynamic geometry aggregation, and relates to the technical field of radiation field reconstruction and computational physics crossing. The method comprises the following steps: extracting a corresponding attenuation coefficient as a priori value; generating a Gaussian radiation element at the position of the monitoring point; calculating the radiation intensity of any point in the space; suppressing mutation of attenuation coefficients of adjacent primitives; gathering to a high dose zone or dispersing to a low dose zone; and generating three-dimensional radiation dose rate distribution by adopting a differentiable split rendering pipeline, and calculating the radiation intensity of any query point in real time by outputting a parameterized Gaussian primitive set. Through the dynamic Gaussian primitive aggregation-physical constraint optimization dual-drive reconstruction framework, the radiation field distribution can still be accurately restored under the sparse detector condition, the error is greatly reduced compared with the traditional method, and the calculation efficiency is obviously improved.

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.

A radiation imaging system comprises a sensor unit of a radiation imaging device, detecting an incident radiation R irradiated from a radiation generator; an arithmetic unit calculating an accumulated dose of the radiation detected by the sensor unit; and an imaging control unit outputting an irradiation stop signal for stopping the irradiation of the radiation R to the radiation generator when the accumulated dose reaches a threshold or more, wherein the imaging control unit sets the threshold based on a dose rate of the radiation R determined based on a relationship between the accumulated dose and a time, and a delay time from a time of outputting the irradiation stop signal to a time of stopping the irradiation of the radiation of the radiation generator.

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.

The present relates to device for ultra-high dose rate radiation treatment to a patient, comprising: —a radiation source for providing a radiation beam, and—a linear accelerator for accelerating said radiation beam until a predetermined energy, and—a beam delivery module for delivery the accelerated radiation beam. The device is arranged for generating an accelerated radiation beam having a predetermined energy between about 50 MeV and about 250 MeV, to deliver rate radiation dose of at least 10 Gy, during an overall time less than about 200 ms in order to generate a radiation field for treating a target volume of at least about 30 cm3, with said ultra-high dose rate radiation dose and / or a target volume located at least about 5 cm deep in the tissue of the patient with said ultra-high dose rate radiation dose.

A small animal imaging and radiotherapy (RT) irradiator device uses a circular array x-ray source to scan an anatomy of an animal, delivers conventional and ultra-high dose rate of radiation to the treatment target. The multipixel x-ray source includes a ring of focal spots capable of irradiating x-ray beams from around fifty beam angles. The x-ray beams are collimated with a collimator designed in treatment planning.

The invention relates to a nuclear facility radiation field model construction method and a dose evaluation system, and the system is configured to establish a three-dimensional space coordinate system, construct a three-dimensional radiation field model based on radiation field data and radiation source data, and correct the radiation field model at the current moment according to the radiation source data, introducing an attenuation coefficient of the three-dimensional nuclear facility on the original three-dimensional scene model to correct the three-dimensional scene model; correcting the radiation field model based on the corrected three-dimensional scene model; calling the three-dimensional scene model and the radiation field model according to an operation path selected by a user; and simulating the space range of each organ of the human body sweeping along with the movement of the human body in the working path in the three-dimensional scene model, obtaining the time of each organ staying on the path of the unit space, and calculating the real-time dose received by the human organ according to the radiation dose rate in the unit space. According to the invention, the change of the radiation field caused by the disassembly and assembly of the nuclear facility can be corrected, and the optimization of radiation protection is realized.

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 nuclear radiation detection management, and discloses a nuclear radiation detection management system based on artificial intelligence, comprising: a dynamic sensing module which detects nuclear radiation through quantum sensing to obtain radiation data, captures NV color center fluorescence intensity, analyzes to obtain gamma ray dose rate, constructs a nanoscale olfactory receptor simulation structure, and sends the radiation data to a control module; radioactive gas is detected and cooperatively monitored; the reasoning calculation module is used for analyzing space-time correlation based on radiation data, optimizing algorithm to accelerate result output, adjusting calculation complexity by calculating dynamic weight distillation, and correcting data transmission in real time; the decision management module is used for constructing a four-dimensional causal graph based on the radiation data, performing intervention simulation, evaluating a decision long-term effect, screening an optimal decision, and performing adversarial training based on historical repair case data; and the fusion cooperation module is used for establishing a cross-mechanism federated learning framework, carrying out hash operation on the radiation data, and establishing an NFT (Network Fourier Transform) on a block chain through an intelligent contract for query, verification and transaction.

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 provides an ultrahigh dose rate radiation method, which comprises the following steps: controlling a plurality of beam modules to be positioned at a plurality of target positions in a one-to-one correspondence manner so as to form different radiation angles relative to the same target part; and under the condition that a to-be-radiated area of a target object is located at the target part, the beam modules are controlled to alternately emit multiple radiation beams to the target part from the different radiation angles, and each radiation beam in the multiple radiation beams has an ultrahigh dose rate. The invention further provides an ultrahigh dose rate radiation device.

The invention provides a radiation detection device and method for measuring ultra-wide-range gamma rays, and relates to the technical field of radiation detection.The radiation detection device comprises a detection assembly, a radiation shielding assembly and a signal processing assembly, and the signal processing assembly is located in the radiation shielding assembly; the detection assembly comprises three GM counting tubes with different measuring ranges and an acquisition circuit, and the acquisition circuit is used for converting signals output by the GM counting tubes into voltage counting signals; the signal processing assembly comprises a high-voltage control circuit, a power supply processing circuit, a pre-amplification circuit and a processor, the power supply processing circuit is used for converting a direct-current power supply signal and then transmitting the converted direct-current power supply signal to the high-voltage control circuit and the acquisition circuit, and the high-voltage control circuit is used for outputting a high-voltage power supply signal to each GM counting tube; the pre-amplification circuit is used for filtering and amplifying the voltage counting signals, and the processor is used for determining a target radiation dose rate according to the processed voltage signals. The radiation detection device provided by the invention has a relatively wide measuring range and relatively high measurement precision.

The invention discloses a dose rate measurement method, device and equipment based on Poisson maximum likelihood estimation, and a storage medium, and the method comprises the steps: obtaining and preprocessing environment nuclear radiation monitoring data, and obtaining a fusion data sequence; dividing the fused data sequence into a plurality of time windows and determining an envelope spectrum sequence; performing radiation dose rate estimation on the envelope spectrum sequence through a Poisson maximum likelihood estimation method to obtain a preliminary dose rate estimation value; determining an environment correction factor according to the temperature data sequence, the humidity data sequence and the air pressure data sequence; correcting the initial dose rate estimation value to obtain a corrected dose rate estimation value; and inputting the corrected dose rate estimated value and the average dose rate and the maximum dose rate in each time window into a support vector machine model for prediction to obtain a future nuclear radiation dose rate prediction result, and updating the optimal estimated value of the dose rate in real time by introducing a Poisson maximum likelihood estimation algorithm. The accuracy and response speed of dose rate estimation are improved.

The invention discloses a nuclear power safety radiation dose rate predictor based on an attention decomposition mechanism, which comprises a database, an upper computer and a sensor, and the database, the upper computer and the sensor are connected in sequence. The database comprises radiation dose rate data of nuclear power safety history monitoring. The upper computer comprises a supervision training module, a data prediction module and a prediction display module. The supervision training module uses nuclear power safety historical monitoring data to train a depth prediction network model and transmits the depth prediction network model to the data prediction module. The sensor obtains nuclear power safety monitoring data in real time and transmits the nuclear power safety monitoring data to the data prediction module of the upper computer for prediction and estimation, and a prediction result is displayed on the prediction display module of the upper computer. According to the invention, the attention decomposition mechanism is innovatively used to obtain the season and trend characteristics of the data, so that the inherent characteristics and rules of the data are better grasped, and the nuclear power safety radiation dose rate predictor based on the attention decomposition mechanism is high in accuracy and capable of realizing online prediction.

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 provides a dynamic trajectory intensity modulated radiotherapy plan optimization method and system, and belongs to the technical field of radiotherapy equipment. A patient data management module is used for acquiring basic information, patient image data and patient radiotherapy plan data of a patient; the region-of-interest sketching module is used for determining a radiotherapy region-of-interest; the conventional plan design module is used for calculating a radiation physical dose according to the conventional plan parameters and performing reverse optimization of a conventional dose rate; and the dynamic track intensity-modulated radiotherapy plan design module is used for calculating the intensity-modulated radiation physical dose according to the dynamic track intensity-modulated radiotherapy plan parameters, and performing dynamic track intensity-modulated radiotherapy dose reverse optimization. According to the method, the optimization speed and quality of the dynamic trajectory intensity modulated radiation therapy plan are improved by using an advanced motion planning algorithm in automatic driving, and the quality of the radiation therapy plan can be improved without hardware modification; the blank of the dynamic trajectory intensity modulated radiotherapy technology is filled, and the cancer treatment level is improved.

The utility model discloses a shielding plugging piece of a synchrotron radiation device beam line station wall outlet hole, which is characterized by comprising a square stepped hole embedded part used for being inserted into the synchrotron radiation device beam line station wall outlet hole, and a lead layer, a polyethylene layer, a lead layer and a polyethylene layer are sequentially filled in the square stepped hole embedded part along the beam direction; the lead layer comprises a plurality of lead bricks with different sizes, the polyethylene layer comprises a plurality of polyethylene bricks with different sizes, each layer of materials are arranged and stacked in a staggered joint manner, and gaps of adjacent layers of materials are not in the same straight line. According to the utility model, bremsstrahlung radiation outside the wall outlet hole at the inner side of the storage ring tunnel can be efficiently shielded, radiation in the storage ring tunnel reaching the downstream of a beam line station through the wall outlet hole is reduced, the radiation dose rate in a downstream experiment hall is further effectively reduced, and workers are prevented from being damaged by radiation.

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.

According to one embodiment, a radiotherapy planning apparatus includes processing circuitry. The processing circuitry set irradiation conditions for a medical image relating to a patient. The processing circuitry acquires a histogram of a radiation dose rate in a predetermined area in the patient based on the irradiation conditions. The processing circuitry evaluates the irradiation conditions based on the histogram. The processing circuitry outputs information based on an evaluation result of the irradiation conditions.

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 belongs to the technical field of marine radiation protection, and discloses a marine containment vessel shielding iterative optimization design method based on regional equal dose, which comprises the following steps: completing transport calculation of neutrons and gamma radiation fields in a containment vessel to obtain radiation distribution of the inner wall of the containment vessel; obtaining a thickness distribution initial scheme of each shielding layer of the containment according to a containment outer wall dose rate design target value; fine transport calculation of neutrons and gamma radiation in the containment and the shielding material is completed, and the radiation distribution of the outer wall of the containment in the scheme is obtained; a containment outer wall dose rate design target value is combined, and an iterative optimization algorithm is adopted to obtain a thickness distribution optimization scheme of each shielding layer of the containment; and carrying out multiple rounds of iterative optimization calculation until the thickness difference between the optimized scheme and the scheme before optimization reaches an expected target. According to the method, an optimized marine containment vessel shielding thickness distribution scheme is formed on the basis of a regional equal dose principle, the shielding weight is optimized while the radiation safety of personnel is guaranteed, and the overall resources of a ship are saved.

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 relates to the technical field of thermoluminescence dating, and discloses a thermoluminescence dating device using low-dose source irradiation, comprising: a detection module adopting a multi-channel detection technology and having a built-in photon detector; the heating module is used for heating the sample to be detected, releasing energy stored in the sample and generating a thermoluminescence signal; the radiation module is used for irradiating the sample and simulating radiation conditions in a natural environment; the data acquisition and analysis module is responsible for recording the signal from the detection module and processing and analyzing the signal; and the mounting module is used for placing a sample to be tested. The thermoluminescence dating device provided by the invention is simple in structure and convenient for a user to load and sample, and can realize that the irradiation unit is close to the limit of the sample and increase the source dose rate, thereby realizing the purpose of low-dose source irradiation, simplifying the equipment management and approval procedures, and then more accurately compensating signal deviation caused by external factors, and improving the dating accuracy of the thermoluminescence dating device. And the measurement precision of the thermoluminescence dating device is 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.

According to the invention, the clinical dose is accurately evaluated. The dose evaluation method includes: a calculation information acquisition step (S1) for acquiring calculation object information including: information relating to radiation including a dose or a dose rate of the radiation to be irradiated to an irradiation object; and information pertaining to the type of cells constituting the irradiation target that is irradiated with the radiation, the information pertaining to the type of cells constituting the irradiation target. An absorbed dose acquisition step (S2) for acquiring, for each type of cells constituting the irradiation target, an absorbed dose indicating the energy of the radiation absorbed by the type of cells; and a calculation step (S4) for calculating, on the basis of the calculation object information and the absorbed dose information, a clinical dose to be irradiated to the irradiation object for each type of cells.

A radiation dose rate control method, which relates to the technology of radiation, and an accelerator (100). The control method is used for an electron linear accelerator (100) comprising a microwave source, an electron gun (102) and an accelerating tube (104). The control method comprises: when an electron linear accelerator (100) outputs a beam, monitoring a first event used for indicating a change of a beam output parameter (S610), wherein the beam output parameter comprises a pulse of an electron gun (102) and a microwave power of a microwave source, and the first event is determined by means of radiation protection requirements; and in response to monitoring the first event, cutting off the pulse of the electron gun (102), and switching a first microwave power of the microwave source to a second microwave power, so that the leakage dose rate of a radiation safety boundary is less than or equal to a first preset threshold (S620), wherein the level of dark current in an accelerating tube (104) under the second microwave power is less than or equal to a second preset threshold. Further provided are a radiation dose rate control apparatus, an accelerator (100), and a radiation apparatus.

The invention discloses a stable numerical simulation method for a total ionization dose (TID) and transient dose rate (TDR) synergistic effect in a semiconductor device. According to the method, a control volume finite element tearing interconnection (CV-FETI) method is utilized, discontinuous boundary conditions are included in common numerical properties, a Newton method is adopted to overcome non-convergence caused by nonlinear characteristics of a drift diffusion model, a stable three-dimensional parallel numerical format is adopted, and a non-continuous boundary condition is obtained. Reliable and accurate simulation of radiation of the semiconductor device is realized. Compared with a Gummel iteration method, the method has good numerical stability and precision under the same voltage step. Through comparison with a commercial software calculation result, the effectiveness of the method is verified. The method provided by the invention has the advantages of good stability, precision and applicability, and can be used for high-efficiency and high-precision numerical simulation of the radiation effect of a semiconductor device, thereby improving the performance, robustness and reliability of an integrated circuit.

Radiation treatment planning includes accessing values of parameters such as a number of beams to be directed into sub-volumes in a target, beam directions, and beam energies. Information that specifies limits for the radiation treatment plan are accessed. The limits include a limit on irradiation time for each sub-volume outside the target. Other limits can include a limit on irradiation time for each sub-volume in the target, a limit on dose rate for each sub volume in the target, and a limit on dose rate for each sub-volume outside the target. The values of the parameters are adjusted until the irradiation time for each sub-volume outside the target satisfies the maximum limit on irradiation time.

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.