47 results about "Neutron count" patented technology

Systems and methods for measuring soil moisture are provided. The system may include a neutron sensor configured to be disposed at a sampling location and including one or more neutron detectors configured to detect fast neutrons and thermal neutrons at the sampling location, and a computing device including at least one data processor and a memory storing instructions, the instructions are configured to cause the processor to perform operations including receiving a first electrical signal characterizing a fast neutron count at a sampling location and a second electrical signal characterizing a thermal neutron count at the sampling location from the neutron sensor, determining a ratio of fast neutrons to thermal neutrons present at the sampling location, a soil moisture measurement is determined based on the ratio, and the soil moisture measurement is provided.

The invention relates to a neutron measuring device (1). The device (1) comprises a housing (90), a high-density polyethylene block (10) in the housing (90), a shell made of neutron-absorbing material (20) integrated into the block (10), a first scintillation neutron detector (30) located inside the shell (20) and capable of emitting a signal proportional to the number of neutrons detected per unit of time, and a module (40) capable of converting the signal into a neutron count rate.

The invention provides a runner chamber wall thickness and void synchronous detection method, and relates to the technical field of hydro-power engineering nondestructive testing, S1, modular calibration: preparing a combined simulation block of a metal standard plate and an organic material plate, establishing a concrete water content inversion model and a void depth model segmented according to the thickness of a steel lining, and outputting calibration parameters; s2, field data acquisition: arranging measuring lines along a vertical welding seam and a longitudinal rib plate of the runner chamber, acquiring ultrasonic echo time and a thermal neutron counting rate, correcting the wall thickness in combination with the temperature of a steel lining, performing secondary verification on an abnormal measuring point, and outputting an original data set S = {}; and S3, machine learning signal processing: performing wavelet packet decomposition to extract energy ratio characteristics, and calculating thermal neutron counting rate fluctuation characteristics. Precise collaborative detection of the wall thickness and the void is realized through a link-by-link process of modular calibration, field data acquisition, machine learning signal processing, segmented collaborative modeling and Internet of Things data management.

The invention belongs to the technical field of nuclear material measurement and analysis, and particularly relates to a neutron detection method for measuring the mass of a nuclear material and a radiation dose field of the nuclear material. According to the embodiment of the invention, the method comprises the steps: carrying out the energy response calculation and calibration of a detector through a parallel beam standard neutron source, and obtaining a calibration factor; performing energy response calculation and calibration on the detector by taking a to-be-measured object as a target object, determining the energy response and fluence-ambient dose equivalent conversion coefficient of the detector in a radiation field of the to-be-measured object, and realizing simultaneous measurement of a neutron counting rate, a fluence rate and an ambient dose equivalent rate; and the requirements of carrying out radiation dose field monitoring while carrying out quantitative analysis on the to-be-detected object in a special scene are met. The technical scheme of the invention can be popularized and applied to fixed-point monitoring of a to-be-detected system with known or measurable nuclear material source item composition and isotope abundance in nuclear facilities, or retention volume analysis and radiation dose measurement before transfer or treatment of some equipment for treating nuclear materials.

This invention relates to a welding temperature gradient control method and apparatus based on neutron source residual stress detection, belonging to the field of welding control technology. This technology establishes a correlation between laser power, beam size, scanning rate, metal type, and temperature by constructing a temperature field data acquisition module and a heating and cooling module for the welding process, and by using laser-assisted local heating and forced substrate cooling devices. It develops a temperature gradient control method to achieve online physical simulation of the temperature gradient between the welding zone and the substrate, solving the problem of mismatch between the welding cooling rate and the neutron data acquisition rate, and realizing in-situ online testing of the stress field near welding conditions.

The invention discloses a borehole influence factor aperture correction method for uranium fission instant neutron logging, and aims to solve the problem of neutron counting rate response deviation caused by borehole size change in a uranium mine logging process. Time spectrums of thermal neutrons and epithermal neutrons in different apertures in uranium fission instant neutron logging are obtained, and the rule that the time spectrums of the thermal neutrons and the epithermal neutrons change along with the hole diameter is researched. And based on a numerical simulation result, a fitting formula and a correction coefficient of the aperture influence factors are solved. The correction method can be used for analyzing the influence of the aperture size change on the counting rate of the neutron detector, effectively improves the uranium mine grade evaluation accuracy under the complex borehole condition, and is especially suitable for well logging interpretation of non-standard borehole diameters and diameter-expanded stratums.

The embodiment of the application provides a kind of neutron flux abnormality detection method and device, electronic equipment and storage medium, belong to nuclear power plant safety technical field.The method comprises: screening reference nuclear power reaction unit.Get the first reference counting rate detection module in multiple continuous preset time steps under the core neutron counting rate.Acquire concentration influence factor, original neutron source source intensity and reference neutron source source intensity.According to the first detection sensitivity, the first reference sensitivity, the core neutron counting rate, the concentration influence factor, the original neutron source source intensity and the reference neutron source source intensity, the predicted neutron flux of the core basket is obtained by calculation.The first loading of pressurized water reactor nuclear power reaction unit is carried out, and the target neutron counting rate is obtained.According to the target neutron counting rate and the first detection sensitivity, the target neutron flux is obtained by calculation, and the abnormality is detected based on the target neutron flux and the predicted neutron flux.The embodiment of the application can improve the efficiency of neutron flux abnormality detection.

A device for evaluating uranium content and hydrogen porosity while drilling includes a probe having a pulsed neutron generator for emitting a pulse of neutrons, a single neutron detector, a neutron counting unit for measuring over time a number of neutrons backscattered from hydrogen nuclei and a number of prompt fission neutrons resulting from interactions with uranium nuclei. The device also includes a hydrogen porosity evaluation unit for evaluating the hydrogen porosity using a total number of backscattered neutrons and a uranium evaluation unit for evaluating the uranium content using a total number of prompt fission neutrons.

The application discloses a formation porosity measurement method, system, logging instrument and medium, and relates to the field of oil and natural gas development. First, the hot neutron counts detected by a first hot neutron detector and a second hot neutron detector in a D-D neutron porosity logging instrument are acquired respectively. Then, gamma time spectrum information detected by a gamma detector in the D-D neutron porosity logging instrument is acquired, and a wellbore Sigma value is determined according to the gamma time spectrum information. Finally, the formation porosity is determined by combining the first hot neutron count, the second hot neutron count and the wellbore Sigma value. The scheme does not need to measure the wellbore size and the fluid type, and improves the accuracy of formation porosity calculation.

The invention relates to a neutron spectrum and proton spectrum distinguishing measurement method and device based on a multi-ball measurement system, and the method comprises the steps: obtaining a current neutron and proton spectrum through employing an SAND-II few-channel spectrum unfolding algorithm based on a neutron and proton response function matrix of the multi-ball measurement system and an original count obtained through a to-be-measured field test; obtaining an original deviation between the measured value and the calculated value; reducing the count of each channel of the current neutron spectrum according to a set proportion, and calculating based on the SAND-II few-channel spectrum unfolding algorithm again to obtain a new proton spectrum, a new proton count, a new neutron spectrum and a new neutron count, and obtaining a new deviation between the total count and the original count; obtaining a plurality of deviations by changing the set proportion for multiple times; and finally, taking the neutron spectrum and the proton spectrum corresponding to the minimum value in all the deviations as measurement results. According to the invention, the neutron and proton real-time distinguishing measurement with relatively wide energy range and relatively high precision in a high-altitude region of the earth or in other neutron-proton mixed fields is realized.

The invention relates to a directional neutron energy spectrum measuring device which is characterized in that a moderation box body is internally provided with moderation liquid and is provided with an upward opening end, a neutron beam is emitted perpendicular to any box body side wall of the moderation box body, and the moderation box body is used for moderating the neutron beam; the thermal neutron detection system is placed in the moderation box body and is used for detecting neutron counts corresponding to the neutron beams at a plurality of positions in the moderation box body to obtain a neutron energy spectrum; and the moving assembly is connected with the thermal neutron detection system, is mounted at the opening end of the moderation box body, and is used for driving the thermal neutron detection system to move in the moderation box body in multiple directions. The purpose of driving the thermal neutron detection system to move in the moderation liquid of the moderation box body through the moving assembly is achieved, and therefore the technical effects that one thermal neutron detection system can move in the moderation liquid, a moderation ball does not need to be replaced, operation is easy, and the risk that employees are irradiated is reduced are achieved.

Disclosed are an apparatus and a method for measuring a neutron beam of ex-vessel of a small modular reactor (SMR). The apparatus for measuring a neutron beam of ex-vessel of a small modular reactor of the present invention comprises: a detector for detecting a current generated by ionization of a neutron beam leaking from a reactor vessel; a preamplifier for receiving a current value of the detector to amplify the current value; a signal processing module for calculating the number and intensity of neutrons leaking in the reactor vessel on the basis of the current value amplified by the preamplifier; and a water level measurement device for transmitting a measurement value obtained by measuring the water level of a medium accommodated in the space between the reactor vessel and a containment vessel to the preamplifier, wherein the preamplifier holds gain value data determined in accordance with the water level of the medium and applies and compensates a gain value in accordance with the measurement value transmitted from the water level measurement device.

The present invention relates to a neutron gamma stacking waveform identification method, and specifically to a neutron gamma pulse waveform stacking identification method under high counting rate conditions. The method solves the technical problem that existing neutron gamma waveform identification methods do not consider the change of the neutron gamma waveform trailing edge, resulting in a low accuracy rate. The neutron gamma pulse waveform stacking identification method under high counting rate conditions includes the following steps: 1) collecting and storing neutron gamma single waveform mixed signals; 2) obtaining a neutron data set and a gamma data set S1; 3) constructing a test set P1 of neutron gamma stacking waveforms; 4) obtaining a neutron data set and a gamma data set S2; 5) constructing a feature parameter set T; 6) constructing a training set sample library P2; 7) constructing a training data set P3; 8) training a neural network, using the trained neural network to identify all waveforms in the test set P1 and output their predicted labels, thereby completing neutron gamma pulse waveform stacking identification under high counting rate conditions.

The invention discloses a two-parameter detector and a two-parameter real-time detection method and system for BNCT, and the detector comprises a sensing element which is made based on a Li2B4O7 crystal; the signal acquisition module is configured to respectively acquire an electric pulse signal and an electric parameter signal for indicating neutron counting from the sensing element; the signal conversion module is used for converting an electric pulse signal for indicating neutron counting into effective pulse counting and converting the electric parameter signal into a resistance parameter; the model calculation module is used for carrying a two-parameter response model and carrying out data processing on the resistance parameters based on the model to obtain corrected neutron flux; the technical problems that in the BNCT treatment process, a gamma-ray energy spectrum analysis method adopted in the prior art is likely to cause interference on the measurement result of the boron concentration, and real-time and rapid monitoring of the boron concentration is difficult to achieve are solved.

The invention provides a quality measurement method, a model training method, electronic equipment, a storage medium and a program product. The method comprises: obtaining neutron counting data of a nuclear material to be measured within a first measurement duration, the first measurement duration being less than a second measurement duration, and the second measurement duration being a duration for performing neutron multiplex measurement on the nuclear material to be measured based on a preset mathematical model; based on the neutron counting data, a neural network model is used for conducting mass measurement on the to-be-measured nuclear material, a measurement result output by the neural network model is obtained, and the measurement result represents the mass of the to-be-measured nuclear material. By means of the scheme, the accuracy of nuclear material quality measurement can be improved under the condition that the measurement time of the to-be-measured nuclear material is shortened.

The application discloses a porosity calculation method and system for complex reservoirs, which comprises the following steps: selecting a marker layer, and performing preliminary correction on original neutron and density logging curves of a target layer by using deviation analysis according to skeleton neutron values and skeleton density values of the marker layer; based on core analysis test data of the target layer, core data is homed in the preliminary corrected neutron and density logging curves, and a fusion analysis chart is formed based on this; the fusion analysis chart is corrected in neutron values by using a neutron multiplication factor initial value, and a neutron multiplication factor final value is determined by comparing a formation porosity calculation value obtained by using the corrected neutron and density with a formation porosity measurement value; and the original neutron and density logging curves are comprehensively corrected by using the preliminary correction amount and the neutron multiplication factor final value, so that the formation porosity of a single well is obtained.

The present application relates to the technical field of neutron logging, and particularly relates to a neutron logging method, system and electronic equipment for measuring formation porosity, the method comprising: when a target formation of a well to be measured is a high-porosity formation, substituting a thermal neutron count ratio of the target formation and formation density of the target formation into a high-formation porosity model to obtain formation porosity of the target formation; when the target formation of the well to be measured is a low-porosity formation, substituting the thermal neutron count ratio of the target formation and the formation density of the target formation into a low-formation porosity model to obtain formation porosity of the target formation. Compared with the prior art, the present application starts from neutron transport theory, fully considers the influence of non-elastic scattering of neutrons on neutron moderation, and finally improves the accuracy and sensitivity of porosity measurement of the target formation. Moreover, the instruments used in the method are common instruments and equipment in the field, which are convenient to operate, implement and test.

The invention provides a device and a method for measuring the surface density of a neutron absorbing material B10. The device comprises a control system, a driver, a neutron detector and a sample holder. The sample rack is used for slidably arranging a to-be-tested sample and a standard sample; the neutron detector is arranged on the sample rack and is used for measuring and outputting neutron data after a neutron beam passes through the to-be-measured sample or the standard sample; the control system is used for receiving measurement data of the neutron detector, calculating the B10 surface density of the to-be-measured sample and controlling the measurement position of the to-be-measured sample and / or the standard sample on the sample rack; the driver is respectively connected with the control system and the sample rack, and drives the to-be-tested sample and / or the standard sample to horizontally move and / or vertically move on the sample rack based on an instruction of the control system. According to the invention, the measurement position of the neutron absorption material can be accurately controlled, accurate measurement of the B10 surface density is realized by using the standard sample with the same raw material and processing technology as the to-be-measured sample, and the neutron absorption performance of the neutron absorption material is accurately evaluated.

The invention relates to the field of neutron energy spectrum detection methods, in particular to a rotating hemisphere neutron energy spectrum detection device and method based on a liquid moderator, and the device comprises a liquid pumping and injecting device, a center detector, a plurality of mutually independent moderation cavities, a rotating hemisphere concentric spherical shell and a rotating device. The method comprises the following steps: simulating characteristic peak response or neutron response under different thickness moderator combinations by utilizing a Monte Carlo method, and compiling the characteristic peak response or neutron response into a corresponding response function matrix; a center detector is used for measuring characteristic gamma ray counts or thermal neutron counts under different thickness moderator combinations to form a count value matrix; and solving by combining the response function matrix and the measured count value matrix to obtain the neutron energy spectrum of the to-be-measured region. According to the invention, the filled moderator combination is directly rotated, and the water pumping and injection time is saved compared with a water pumping and injection type single-sphere neutron energy spectrometer.

A method for measuring porosity of a subterranean formation includes the steps of: positioning a nuclear logging tool having one or more neutron sources and two or more dual function detectors in a subterranean formation; causing the one or more neutron sources to emit neutrons in a plurality of neutron pulses toward the subterranean formation and to generate neutrons and gamma rays in the subterranean formation; obtaining one or more neutron count rates for each of the two or more detectors; determining a formation type of the subterranean formation based on the gamma rays received by the one or more detectors; calculating one or more neutron count rate ratios between the neutron count rates of two detectors selected from the two or more detectors; and obtaining one or more formation porosities based on the formation type and the one or more neutron count rate ratios.

The invention relates to a fractured sandstone uranium mine prompt neutron logging numerical simulation method based on a disperse multi-angle random statistical theory. The method comprises the steps of firstly establishing a geological model of the fractured sandstone-containing uranium mine based on a dispersion multi-angle theory; then the simulation pulse neutron source emits neutrons to the stratum, the neutrons and uranium in the cracks are subjected to fission reaction, and instant neutrons are released; then simulating the movement and reaction process of neutrons in the stratum; and finally, recording logging response by a neutron flux counter, and obtaining epithermal neutron count and thermal neutron count according to the energy range. Through tests, the fractured sandstone uranium mine prompt neutron logging numerical simulation method based on the scattered multi-angle random statistical theory can effectively simulate prompt neutron logging responses of sandstone uranium mines under fractures of different angles, and epithermal neutron counting and thermal neutron counting are obtained.

This invention relates to the field of well logging technology, specifically to a thermal neutron imaging well logging method and apparatus. The method includes: generating a neutron count rate curve; determining the neutron lifetime at which the neutron count rate curve cuts off based on the curve; and determining the formation boundary based on the neutron lifetime. This application improves the accuracy of formation detection.

The application discloses a formation density measurement method, a storage medium and equipment, and relates to the field of well logging technology. The method comprises the following steps: establishing a neutron logging model of formation density for representing the relationship between the formation density and the non-elastic gamma count ratio and the thermal neutron count ratio; and substituting the non-elastic scattering gamma ray count ratio, the thermal neutron count ratio and a plurality of calibration coefficients of a target formation of a well to be measured into the neutron logging model of formation density to obtain the formation density of the target formation of the well to be measured. According to the method, the final formation density can be obtained by using the thermal neutron and the non-elastic gamma count. The method has the characteristics of small influence of formation lithology, high measurement efficiency and simple design of related instruments.

The invention discloses a water injection multi-sphere neutron energy spectrum measurement device and method, and belongs to the technical field of neutron energy spectrum measurement, the device is characterized in that a plurality of concentrically nested spherical shells are connected to the same supporting cylinder, a through channel is arranged in the center of the supporting cylinder, and a through flow channel is arranged in the column wall; the through flow channel is respectively communicated with each inter-shell cavity, is provided with a one-way valve, and is also provided with an air pipe and an overflow hole; water is sequentially injected into the cavity between the shells through the water channel, neutron counts under different water layers are obtained through the neutron detector, and then the energy spectrum of the neutrons to be measured is obtained through calculation; by means of the mechanical one-way valve and the water flow channel of a special structure, water can be injected into air between the shells from inside to outside in sequence, water can be drained at the same time through gravity, compared with an electromagnetic valve, the device is more stable and durable, an external cable is not needed, the service life of the whole device is greatly prolonged, and the machining and manufacturing difficulty of the device is reduced.

The present application relates to a kind of plutonium-containing material quality analysis method, by the following steps: the calculation model of measurement object is established, the detection efficiency when loading different material amount is simulated by MCNP, the detection efficiency library of material spontaneous fission neutron under the calculation model is calculated;The detection efficiency of neutron counting module corresponding to different C value is calculated and verified, and the detection efficiency ε of corresponding neutron counting module is judged according to the C value when loading material;The total number of neutrons S of neutron counting module, the detection efficiency ε of neutron counting module is used to calculate the material quality m loaded in mixing funnel.The method provided by the present application can be used to quickly monitor the material content in mixing funnel using neutron analysis method under the condition that the process is basically stable, obtain the material content in mixing funnel, to realize real-time measurement of material quantity under special conditions, and the measurement deviation is less than 10%, meet the normal operation and safety requirement of process production, can realize normal filling and transfer storage of material.

This invention provides a uranium content detection method, device, storage medium, and electronic device, belonging to the field of mineral exploration technology. The uranium content detection method includes: acquiring well logging data, which includes hyperthermal neutron counts, thermal neutron counts, and macroscopic scattering cross-section information, obtained by logging after emitting pulsed neutrons into the well to be logged; calculating the formation uranium content based on the hyperthermal neutron counts, thermal neutron counts, and macroscopic scattering cross-section information using a pre-set formation uranium content calculation model, which is based on a numerical simulation model of uranium content, mineralization, and porosity conditions established using the Monte Carlo method. This method can eliminate the errors caused by formation porosity and mineralization in the uranium content calculation process, improving the accuracy of formation uranium content evaluation and the efficiency of uranium ore detection.

The application provides a method and a device for monitoring subcriticality in a reactor physics startup process, which can be applied to the field of reactor physics technology. The method comprises the following steps: obtaining neutron count change data of a reactor in a physics startup process; processing the neutron count change data based on an inverse kinetics method to obtain a first criticality; processing the neutron count change data based on an extrapolation method to obtain a second criticality; and determining the subcriticality of the reactor according to the first criticality and the second criticality. Embodiments of the application can calculate the subcriticality of the reactor in the physics startup process by combining the inverse kinetics method and the extrapolation method through neutron count change data. By combining the inverse kinetics method and the extrapolation method, the subcriticality of the reactor can be more accurately measured.

The embodiment of the invention provides a neutron fluence rate anomaly detection method and device, electronic equipment and a storage medium, and belongs to the technical field of nuclear power station safety. The method comprises the following steps: screening out a reference nuclear power reaction unit; and obtaining the reactor core neutron counting rate of the first reference counting rate detection module in a plurality of continuous preset time steps. And acquiring a concentration influence factor, an original neutron source intensity and a reference neutron source intensity. And performing calculation according to the first detection sensitivity, the first reference sensitivity, the reactor core neutron counting rate, the concentration influence factor, the original neutron source intensity and the reference neutron source intensity to obtain a predicted neutron fluence rate of the reactor core hanging basket. Charging the pressurized water reactor nuclear power reaction unit for the first time, and obtaining a target neutron counting rate; and performing calculation according to the target neutron counting rate and the first detection sensitivity to obtain a target neutron fluence rate, and performing anomaly detection based on the target neutron fluence rate and the predicted neutron fluence rate. According to the embodiment of the invention, the efficiency of neutron fluence rate anomaly detection can be improved.

This technology provides a way to measure the moisture content and water content of fuel debris storage containers. [Solution] The measurement system comprises a neutron generator that irradiates the object to be measured with neutrons, a neutron detector that detects neutrons in different energy bands, and a measuring device that generates a neutron spectrum based on the neutron count rate detected by the neutron detector and measures the amount of water and / or hydrogen in the object to be measured based on the spectral information of the medium velocity group and above in the neutron spectrum.

The invention provides an environment monitoring system and method. The method comprises the following steps: collecting counting rate data of cosmic ray neutrons in saline-alkali soil through a neutron detector; extracting energy attenuation characteristics of cosmic ray neutrons from the counting rate data; determining the absorption effect of salt on the cosmic ray neutrons based on the energy attenuation characteristics and the salt concentration of the saline-alkali soil, and correcting the moderation length when the cosmic ray neutrons and water in the saline-alkali soil collide and moderate according to the absorption effect to obtain bound water distribution of the saline-alkali soil; the temperatures of the saline-alkali soil at different depths are measured through a temperature sensor, the free water adsorption strength of salt at different depths is quantified through the change trend of all the temperatures and bound water distribution, and the adsorption flux of the saline-alkali soil is obtained; performing inversion correction on the actually measured water content of the saline-alkali soil according to the adsorption flux to obtain the effective water content of the saline-alkali soil. By adopting the scheme, the influence of bound water on the effective water content of the saline-alkali soil can be corrected.