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92 results about "Nuclear detection" patented technology

The threat of radiological attacks has led several organizations to develop specially designed nuclear detection systems. These systems differ in design and abilities.

Monte Carlo simulation method for moving body dose based on data field segmentation

The invention discloses a Monte Carlo simulation method for moving body dose based on data field segmentation. The method includes the steps of: a) acquiring calculated input parameter, b) forming a body bounding box on the basis of a tree structure of an entity so as to acquire a body discrete state sequence, c) segmenting particle track data into a sensitive data field and a non-sensitive data field based on the body bounding box, d) alternately processing circulating simulations of the two data fields, processing a relative state transition of particles when entering or exiting the sensitive data field, delivering the particles in the same model, dividing each of the particles entering the sensitive data field split into two particles respectively of the weights of 1/ m and 1-1 / m, and then delivering the two particles respectively in two data fields, and e) acquiring the precise dose change of the human body in movements through a linear interpolation. The method can be used for accurately calculating dose changes of the moving body and every organ, and is high in speed and widely applicable to fields such as maintenance and assembling, roaming and nuclear detection under the circumstances of radiation shield and nuclear radiation.
Owner:HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI

Ex-core nuclear detection system and method for pressurized water reactor

The invention provides an ex-core nuclear detection system for a pressurized water reactor. The ex-core nuclear detection system is used for zero-power physics testing of reactors, and comprises an intermediate range detector and a reactivity meter, wherein the intermediate range detector is arranged outside a reactor pressure vessel and is used for measuring the nuclear power of the reactor; the reactivity meter calculates the reactivity of the reactor core according to data measured by the intermediate range detector; the reactive data can be used for measuring an isothermal temperature coefficient and a control rod value. Therefore, data measured by the intermediate range detector is transmitted into the reactivity meter, a test with high flux fluctuation can be performed, the gamma noise influence is small, the system can be far away from a Doppler heating point, the measurement result is accurate, low leakage and a low-leakage loading scheme can be implemented, the economic efficiency of fuel utilization is improved, and design of multi-reflection layer can be adopted, so that the economic efficiency and shock resistance of the fuel utilization are further improved, the measurement result is slightly influenced by spatial positions, and the influence of reactor cavity water injection transformation and the like because of RPN outward movement can be effectively reduced.
Owner:CHINA NUCLEAR POWER TECH RES INST CO LTD +1

Digital nuclear detector state evaluation and guarantee maintenance method and system

The invention discloses a digital nuclear detector state evaluation and guarantee maintenance method and system. The digital nuclear detector state evaluation and guarantee maintenance system gives a quantitative index for nuclear detector state evaluation and guarantee maintenance under the condition of not increasing an extra hardware circuit, and can realize on-line monitoring and make an effective expectation, thereby reducing service and maintenance cost of the nuclear detector, and improving reliability, stability and availability of the nuclear detector. The method is characterized by, to begin with, setting type attribute parameters of the detector; determining performance characteristic parameters to be evaluated of the detector; collecting data related to the performance characteristic parameters to be evaluated and generating list data; then, calculating the current performance characteristic parameters of the nuclear detector according to the list data; with the historical data being combined, analyzing and evaluating the current performance level and change trend of the nuclear detector to obtain the quantitative index of the current health state; and finally, making a guarantee maintenance auxiliary decision of the detector according to the quantitative index state.
Owner:NO 719 RES INST CHINA SHIPBUILDING IND

Presetting device and presetting method for focal plane of detection camera

For solving the technical problems that an existing presetting method for a focal plane of a detection camera is more trouble and low in efficiency, and cannot realize presetting of the focal plane ina vacuum environment, the invention provides a presetting device and a presetting method for the focal plane of the detection camera. The presetting device and the presetting method are characterizedin that defocusing distance of the detection camera is converted into that of a star simulator by using the conjugacy relation and the defocusing distance relationship between the star simulator andimaging of the detection camera; confusion spot images, acquired by the detection camera, of the star simulator at different defocusing distances, are analyzed to obtain imaging characteristics of thedetection camera at different defocusing distances, so that motion of a focal plane component of the detection camera is avoided, multiple fixation and adjustment of the posture of the focal plane component of the detection camera are not needed, and the testing efficiency is improved; the detection camera is arranged in a vacuum tank. The imaging characteristics of confusion spots of the detection camera under vacuum conditions are assessed by using the presetting device and the presetting method disclosed by the invention, and further focal plane presetting in the vacuum environment can berealized.
Owner:XI'AN INST OF OPTICS & FINE MECHANICS - CHINESE ACAD OF SCI

Nuclear detection device

The invention discloses a nuclear detection device which comprises a flicker unit, a micro-optics unit, a photovoltaic conversion device and an image collecting and data processing unit, wherein the flicker unit is made of organic or inorganic crystals or thin film materials and is used for converting incidence beams into flicker light, and the converted flicker light is radiated to the micro-optics unit; a unit lens is used for generating a unit image of an object and the image is received by the photovoltaic conversion device; the photovoltaic conversion device is used for converting the received unit image into a two-dimensional data electric signal and transmitting the unit image to the image collecting and data processing unit; and the image collecting and data processing unit is used for acquiring, storing and processing the two-dimensional data electric signal obtained by the photovoltaic conversion device, and carrying out data reconstruction according to an optical path structure of the device so as to obtain the position that a photon is generated in the flicker unit. With the adoption of the device, the requirements on the flicker materials are reduced, the three-dimensional information about the position that the flicker light is generated in the flicker materials is obtained directly, the position identification can be realized and at the same time energy identification ability is provided, so that the performance of the nuclear detection device is improved.
Owner:INST OF HIGH ENERGY PHYSICS CHINESE ACADEMY OF SCI

Thickener underflow concentration detection system

ActiveCN106546660ASolve the problem of radiation pollution in concentration detectionSolve the problem of radiation pollutionMaterial analysis using sonic/ultrasonic/infrasonic wavesHigh concentrationNuclear detection
The invention relates to a thickener underflow concentration detection system. The thickener underflow concentration detection system comprises an underflow pulp detection device, an underflow pulp diluting device and a diluted pulp detection device, wherein the underflow pulp detection device is connected with a bottom pipeline of a thickener and is used for discharging bottom pulp of the thickener and detecting the flow rate of the pulp, the underflow pulp diluting device is connected with the output end of the underflow pulp detection device and is used for diluting the pulp outputted by the underflow pulp detection device through addition of water and then outputting diluted pulp, one end of the diluted pulp detection device is connected with the output end of the underflow pulp diluting device while the other end thereof is connected with a settling area on the upper portion of the thickener, and the diluted pulp detection device is used for detecting the flow rate and the concentration of the pulp outputted by the underflow pulp diluting device and is used for delivering detected pulp into the thickener. The thickener underflow concentration detection system is capable of achieving real-time reliable non-nuclear detection of the high-concentration underflow pulp of the thickener without causing pulp loss and pollution to the surrounding environment.
Owner:北京金诚信矿山技术研究院有限公司

Rotary semi-closed nuclear detection release device

The invention discloses a rotary semi-closed nuclear detection release device, comprising: a storage component, wherein the interior of the storage component is hollow, the bottom of the storage component is not closed, and road signs are stored in the storage component; and a push component comprising a power component and a baffle, wherein the baffle is arranged below the storage component to block the road signs from falling; wherein the power component is placed obliquely below the road signs to drive the baffle to rotate so as to control the number of road signs in the storage component;and the width of the storage component is not less than the diameter of each road sign and is not greater than the twice of the diameter of each road sign, and the road signs are stored in a column inthe storage component. According to the rotary semi-closed nuclear detection release device disclosed by the invention, the monitoring personnel in a nuclear pollution monitoring vehicle uses an automatic road sign release device to mark whether there is nuclear radiation pollution in the surrounding area, thereby effectively preventing the worker from directly exposing to a nuclear accident occurrence area, avoiding the direct contact with a radiation source at a close distance to be contaminated by radioactive substances, and maximally ensuring the personal safety of rescuers in the nuclearpollution area.
Owner:JIANGNAN UNIV

Positron annihilation angle correlation measurement device and method based on positioning algorithm

ActiveCN111487664AAvoiding Collimator-Dependent PitfallsAvoid defectsX-ray spectral distribution measurementNuclear engineeringFluorescence
The invention, which belongs to the technical field of nuclear detection, relates to a positron annihilation angle correlation measurement device and method based on a positioning algorithm, thereby solving a problem that the measurement precision in the prior art is limited by the equipment precision. The device comprises a first fixed detector and a second fixed detector, a coincidence module, apositioning system, and a coincidence system. The first fixed detector and the second fixed detector are respectively used for detecting fluorescence signals generated by first gamma photons and second gamma photons which are generated by annihilation of electrons and positron in a sample and are propagated along a reverse direction; the coincidence module is used for processing the fluorescencesignals to obtain a first two-dimensional array and a second two-dimensional array which correspond to each other; the positioning system is used for obtaining incident position information of the first gamma photons and the second gamma photons according to the two-dimensional array; and the coincidence system is used for collecting incident position information of the first gamma photons and thesecond gamma photons within coincidence time, obtaining a corresponding three-dimensional annihilation angle in combination with the position information of the sample, and further obtaining a two-dimensional positron annihilation angle correlation spectrum. The defect that the measurement precision is limited by the precision of measurement equipment is overcome, and the measurement precision isimproved.
Owner:INST OF HIGH ENERGY PHYSICS CHINESE ACADEMY OF SCI

Radioactive source security monitoring and management system

The invention relates to a radioactive source security monitoring and management system, provides the radioactive source security monitoring and management system based on practical needs, and aims to apply modern information management technologies such as a nuclear detection technology, a GPRS (general packet radio service) wireless data communication technology, 3G (3rd-generation) video and a large database to the radioactive source security monitoring and management system to realize the intelligent real-time monitoring and management of a radioactive source. The radioactive source security monitoring and management system comprises a radioactive source security monitoring and management terminal, accessory equipment and n site acquisition instruments, wherein n is an integer; the radioactive source security monitoring and management terminal is connected with the n site acquisition instruments through a GPRS network. According to the radioactive source security monitoring and management system, the radioactive source and a ray device are tracked and positioned by adopting a GPS (global positioning system) satellite positioning technology. The radioactive source security monitoring and management system is applied to industrial field and other related fields adopting radioactive sources.
Owner:TECHN PHYSICS INST HEILONGJIANG ACADOF SCI

Positron annihilation angle correlation measurement method

ActiveCN111487666AWork around limitations of measuring angle associationsAvoid count lossX-ray spectral distribution measurementGamma photonNuclear engineering
The invention, which belongs to a nuclear detection technology, relates to a positron annihilation angle correlation measurement method, thereby solveing the problems of low feasibility, complex operation, low measurement efficiency and poor precision of an existing measurement method. The method comprises the following steps: respectively detecting incident position information of first gamma photons and second gamma photons which are generated by annihilation of electrons and positron in a sample and are propagated along a reverse direction by utilizing a plurality of first strip-shaped detection units of a first fixed detector and a plurality of second strip-shaped detection units of a second fixed detector; acquiring incident position information of the first gamma photons and the second gamma photons within the coincidence time, and obtaining a corresponding annihilation angle according to the incident position information and the position information of the sample; and acquiringa one-dimensional positron annihilation angle correlation spectrum according to the annihilation angle. The method is high in feasibility, the operation is simplified, and the measurement efficiency and measurement precision are improved.
Owner:INST OF HIGH ENERGY PHYSICS CHINESE ACADEMY OF SCI

Two-dimensional positron annihilation angle correlation measurement device and method

The invention, which belongs to the technical field of nuclear detection, relates to a two-dimensional positron annihilation angle correlation measurement device and method, thereby solving problems that an existing measurement device is large in counting loss, complex in operation and difficult to popularize and apply. According to the device, a first fixed detector and a second fixed detector are symmetrically arranged on the two sides of a sample in parallel respectively; a plurality of first square detection units of the first fixed detector and a plurality of second square detection unitsof the second fixed detector are respectively used for detecting incident position information of first gamma photons and second gamma photons which are generated by annihilation of electrons and positron in the sample and are propagated along the reverse direction; and a coincidence system is used for collecting incident position information of the first gamma photons and the second gamma photons within coincidence time, obtaining a corresponding three-dimensional submergence angle in combination with the position information of the sample, and further obtaining a two-dimensional positron annihilation angle correlation spectrum. The counting rate and the measurement precision are improved, the operation is simplified, and the applicability is high.
Owner:INST OF HIGH ENERGY PHYSICS CHINESE ACADEMY OF SCI
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