64 results about "Gamma energy" patented technology

The invention discloses an ocean in-situ radioactivity monitoring method, which is characterized in that feature extraction is carried out based on a maximum likelihood expected value maximization (MLEM) algorithm, and spectrum unfolding operation is carried out by adopting a multi-layer perceptron. The method comprises the following steps: firstly, measuring FWHM related parameters of a CeBr3 detector by adopting a standard source, simulating the response of the detector to gamma rays in a marine environment based on a Monte Carlo method, and establishing a full-spectrum response matrix H in a range of 0-2048keV; based on the response matrix H, reconstructing a gamma energy spectrum y obtained by the detector by using an MLEM iterative algorithm; and the reconstructed spectrum is used as the input of a multi-layer perceptron (MLP), and qualitative and quantitative analysis of radionuclides in the energy spectrum is realized. According to the method, the discrete characteristic peak signal is convolved into the single path address corresponding to the characteristic energy, so that the accuracy of the MLP model in the spectrum unfolding process is effectively improved.

The invention relates to the technical field of gamma-ray spectrum analysis, particularly provides a gamma-ray detector activation analysis method and a PGNAA detection system, and aims to solve the problems that gamma rays obtained by detection of an existing gamma-ray detector comprise rays generated by decay of crystals after activation in a neutron field; therefore, the component detection result of the to-be-detected sample is not accurate. In order to achieve the purpose, the activation analysis method for the gamma detector comprises the steps that a to-be-detected sample is irradiated through a neutron source; repeatedly collecting a plurality of groups of gamma-ray energy spectrums of the sample to be detected by using a gamma-ray detector; constructing an energy spectrum signal matrix based on the gamma-ray energy spectrum of the to-be-detected sample, wherein the energy spectrum signal matrix is a mixed signal composed of instant gamma rays generated by neutron activation of the to-be-detected sample, environmental background gamma rays and interference signals generated by crystal activation in a gamma detector; and obtaining the effective instant gamma ray based on the energy spectrum signal matrix. The self-interference influence of the detector is effectively reduced, and the target element content evaluation precision of the to-be-detected object is improved.

The invention relates to the technical field of precision agriculture, and provides a variable rate fertilization prescription map generation method and system based on a gamma-ray energy spectrum. The method comprises the following steps: acquiring field data through a gamma-ray energy spectrometer, a soil sensor and remote sensing equipment, and predicting spatial distribution of available nutrients in soil by adopting feature fusion and a machine learning model; calculating a target yield fertilization amount based on a nutrient balance method; calculating the fertilizer shortage corrected by the soil texture; carrying out weighted fusion on the graded fertilization amount and the economic optimal fertilization amount to generate a recommended fertilization amount and making a prescription map; precise fertilization control is realized through a positioning and control algorithm in combination with feed-forward compensation or a Smith predictor; and an active learning strategy is adopted to identify a high-uncertainty region, and verification is preferentially carried out to continuously optimize the model. According to the method, soil spatial variation, crop requirements and economic benefits are integrated, accurate fertilization recommendation is realized, the fertilizer utilization rate is effectively increased, and the economic benefits are guaranteed.

The invention provides a while-drilling radioactive logging system, a logging method and a drilling tool assembly, and belongs to the technical field of oil-gas exploration, and the system comprises at least one perovskite semiconductor detector which is used for directly absorbing gamma rays from a stratum and generating corresponding electric pulse signals; the electronics module is electrically connected with the perovskite semiconductor detector and used for processing the electric pulse signal to obtain while-drilling radioactive logging data, and the while-drilling radioactive logging data comprises at least one of natural gamma counting data, natural gamma energy spectrum data and gamma-gamma density data; the protection packaging body comprises a metal shock-resistant and high-pressure-resistant shell, a heat insulation and heat preservation layer and a heat channel which are arranged in the metal shock-resistant and high-pressure-resistant shell, and a high shock-resistant and impact-resistant connecting piece for fixing internal devices, and the protection packaging body is used for accommodating the perovskite semiconductor detector and the electronics module; and the safety and the accuracy of radioactive logging while drilling are improved.

The utility model discloses a storage type gamma magnetic positioning combined logging instrument which comprises a shell, a thermos bottle and a CCL magnetic detection assembly are fixedly arranged in the shell, and a gamma detection assembly and a circuit module are arranged in the thermos bottle and used for collecting, processing and storing gamma data and CCL signal data. The gamma detection assembly is arranged below the circuit module; the gamma detection assembly and the CCL magnetic detection assembly are electrically connected with the circuit module. The two ends of the shell are provided with a protective cap and a protective plug in a threaded connection mode respectively. According to the storage type gamma magnetic positioning combination logging instrument, the two logging units of the gamma energy spectrum instrument and the CCL instrument are designed and combined into one logging unit, the length of the instrument is shortened, the logging construction risk is greatly reduced, the pumping-out or direct pushing technology is adopted, real-time data storage is achieved in the logging process, and the logging efficiency is improved. The defects existing in cable type logging are well overcome.

The application discloses a kind of based on pulse neutron technology's borehole in-situ lithium ore content measurement method and device, device includes pulse neutron generator, neutron detector, gamma detector and electronic processing equipment, measurement method includes: obtaining the time spectrum information of borehole in-situ place detection neutron, according to time spectrum information, neutron lifetime is calculated;According to the formation of different lithium ore grade under the macroscopic cross section of neutron lifetime calculation;According to the relationship equation of formation macroscopic cross section and lithium content, based on the calculation of formation macroscopic cross section, obtains scale lithium content;The calibration curve of lithium content is scaled based on the distribution of formation macroscopic cross section and scaled calculation, and the actual lithium ore grade distribution of formation is obtained.According to the change of time spectrum attenuation under different borehole size, wellbore correction equation is established, and the influence of wellbore is corrected.According to gamma energy spectrum, the content of hydrogen in water-containing wellbore is monitored, and the influence of water-containing wellbore is corrected according to hydrogen characteristic peak count.

This invention belongs to the field of uranium resource exploration technology, specifically relating to a method and apparatus for detecting gamma rays. The method includes: utilizing... 241 The equivalent peak position after the interaction of Am and NaI(Tl) crystals serves as a self-stabilizing peak, providing a stable gamma-ray reference peak and achieving automatic spectrum stabilization. A digital high-speed multichannel module acquires gamma-ray signals, achieving full acquisition of gamma-ray signals in the energy range of 30keV to 3000keV. Multiple Regions of Interest (ROIs) are set for the acquired gamma-ray signals using digital energy thresholds, obtaining CPS counts for the quantitative gamma energy range, the natural gamma energy range, and the uranium-thorium-potassium (UHT) energy range of the gamma spectrum. Using the calibration coefficients of each parameter in the standard model, and based on the CPS counts for the quantitative gamma energy range, the natural gamma energy range, and the UHT / UHT energy range of the gamma spectrum, the quantitative gamma, natural gamma, and gamma spectrum detection results are output. This invention enables a single probe to simultaneously output measured data for quantitative gamma, natural gamma, and gamma spectra, improving the efficiency of acquiring these data.

The present application relates to a kind of impulse neutron logging gamma spectrum broadening coefficient calculation method, mainly for calculating the broadening coefficient of gamma spectrum collected by impulse neutron logging.Gamma spectrum broadening can be regarded as the convolution of Gaussian response matrix and un-broadened spectrum, the present application uses the characteristic gamma ray energy of different elements as prior knowledge to set additional weight for channel address in characteristic peak area of spectrum, and designs the calculation scheme of additional weight value.At the same time, a broadening coefficient calculation objective function with spectrum characteristic constraint is proposed combining with weighted least squares method.Furthermore, swarm intelligence optimization method is used to solve the objective function, and the broadening coefficient is determined, which is an accurate and efficient gamma spectrum quantitative analysis method, realizes the accurate calculation of gamma spectrum broadening coefficient, and lays a foundation for subsequent impulse neutron logging spectrum data analysis and formation property evaluation.

The invention provides a multi-nuclide gamma energy spectrum characteristic peak area calculation method, which comprises the following steps: acquiring a multi-nuclide gamma energy spectrum, and determining a characteristic peak range of the multi-nuclide gamma energy spectrum; gaussian fitting processing is carried out on the determined characteristic peak range; determining the position and the area of a corresponding characteristic peak according to a Gaussian fitting processing result; and calculating the area of the characteristic peak according to the determined position and area of the characteristic peak. By applying the method, the area of the characteristic peak of the multi-nuclide gamma energy spectrum can be quickly and accurately calculated.

The present invention discloses a device and method for inverting lunar rock types through annihilation radiation, belonging to the technical field of lunar geological structure detection. The method uses a proton accelerator to obtain high-current proton bombardment of typical lunar rock composition samples, and simultaneously uses a detector to measure the induced gamma energy spectrum information generated by the samples. The proton stream bombards the samples to be tested, obtains the annihilation radiation count rate in the 511keV energy window and the count rate in the 969-1133keV characteristic peak area of ​​different samples to be tested, and calculates the ratio of the two. Different lunar rock types are accurately distinguished based on different ratios. The present invention achieves accurate distinction of lunar rock types by successfully stimulating the annihilation radiation of typical rocks using a direct ground calibration method.

The invention discloses a nonlinear iteration-based gamma energy spectrum unfolding optimization method and device, and the method comprises the steps: obtaining known gamma energy spectrum data, and carrying out the preprocessing of the known gamma energy spectrum data, and obtaining the preprocessed known gamma energy spectrum data; nuclide feature extraction is carried out on the preprocessed known gamma energy spectrum data to obtain nuclide feature peak positions and corresponding intensity information; constructing an initial nuclide component model based on the nuclide characteristic peak position and the corresponding intensity information; optimizing the initial nuclide component model by adopting a nonlinear iterative algorithm to obtain an optimized nuclide component model; performing spectrum unfolding on unknown gamma energy spectrum data according to the optimized nuclide component model to obtain the type and activity information of nuclides, adaptively adjusting nuclide component model parameters by introducing a nonlinear iterative algorithm, and further performing spectrum unfolding on the unknown gamma energy spectrum data through the optimized nuclide component model to obtain the type and activity information of the nuclides. And the spectrum unfolding accuracy and efficiency of the gamma energy spectrum are obviously improved.

The present application relates to the technical field of nuclear radiation monitoring, in particular to a kind of water total radioactivity and nuclide online measurement system, comprising: gamma detector, beta detector, alpha detector and water treatment component, the water treatment component extracts water sample and processes after passing through the gamma detector, beta detector and alpha detector, the gamma detector is arranged in the first shielding body, the beta detector and the alpha detector are arranged in the second shielding body;Water treatment component provided by the present application is responsible for extracting and processing water sample, so that it passes through various detectors in turn, gamma detector obtains the gamma energy spectrum of water sample, beta detector and alpha detector obtain the beta and alpha total activity of water sample, to realize the accurate detection of different types of radiation.

The present application relates to a pressurized water reactor fuel cladding breakage online monitoring method and a monitoring system thereof, the method comprising the following steps: step S1: obtaining a pre-established energy calibration relationship, which is a corresponding relationship between gamma ray energy and channel number; step S2: obtaining pre-calibrated efficiency curve parameters, which are obtained through active efficiency calibration based on a simulated tubular standard radioactive source, the material, outer diameter and inner diameter of the simulated tubular standard radioactive source being consistent with those of the measured pipeline; step S3: obtaining gamma energy spectrum data through a back-to-back coincidence measurement technology, and automatically deconvoluting the gamma energy spectrum data according to the energy calibration relationship and the efficiency curve parameters to calculate the type and activity concentration of fissile nuclides in the measured pipeline; and step S4: determining a corresponding preset threshold value according to the type of fissile nuclides, and comparing the activity concentration with the preset threshold value to obtain a monitoring result of pressurized water reactor fuel cladding breakage.

The present invention provides a gadolinium-based neutron / gamma discrimination system, comprising a gadolinium-based neutron detector, a gamma-ray detector, a preamplifier circuit connected to the detector, and a dual-channel digital multichannel spectrometer. The dual-channel digital multichannel spectrometer receives two pulses amplified by the preamplifier circuit. When the time difference between the arrival times of the two pulses is within a set threshold, the system counts neutron signal events and further extracts amplitude values, recording them in the neutron response energy spectrum and gamma energy spectrum, respectively. The present neutron / gamma discrimination system combines physical processes with electronic technology. A thin sheet of gadolinium-based material absorbs only internal conversion electrons and low-energy background gamma rays. The system then uses the temporal relationship between internal conversion electrons and secondary prompt gamma rays to further distinguish whether the signal detected by the gadolinium-based material sheet is internal conversion electrons or low-energy background gamma rays, thereby achieving neutron / gamma discrimination.

The invention relates to the technical field of underwater detection, and discloses an underway marine radioactivity monitoring system and a radioactivity energy spectrum processing method thereof, and the method comprises the steps: obtaining detection energy spectrum data which is a low-count gamma energy spectrum collected under an underway measurement condition; constructing an energy spectrum response matrix, wherein the energy spectrum response matrix is used for representing the response relationship of different energy gamma rays in the detector; based on a compressed sensing reconstruction algorithm, solving the detection energy spectrum data by using the energy spectrum response matrix to obtain an original emergent gamma energy spectrum; and nuclide identification and activity calculation are carried out according to the original emergent gamma energy spectrum. According to the scheme, efficient and accurate processing of the underway measurement low counting energy spectrum can be realized.

The invention relates to an online single-sphere neutron gamma-ray spectrum detector and a detection system. Wherein the detector comprises a spherical moderation body and a plurality of detectors; the plurality of detectors are arranged on the spherical moderator, the distances from the plurality of detectors to the sphere center of the spherical moderator are different, the plurality of detectors are arranged at the same depth from the sphere center of the spherical moderator, and the plurality of detectors at least comprise a CLYC detector. According to the invention, the plurality of detectors are arranged in the same spherical moderator, and the plurality of detectors are arranged at positions with different distances from the sphere center of the spherical moderator, so that large-range energy detection can be realized, the size is small, the weight is light, and carrying is convenient; moreover, the device comprises a CLYC detector, so that the device has the capability of detecting neutrons and gamma information at the same time.

The invention provides a gamma energy spectrum data peak center offset correction method based on a Sallen-Key filtering function, which is used for solving the technical problem of peak center offset in the process of smoothing gamma energy spectrum data based on the Sallen-Key filtering function at present. The invention provides a gamma energy spectrum data peak center offset correction method based on a Sallen-Key filtering function, and the method comprises the steps: constructing a digital filter circuit based on a second-order Sallen-Key filtering function, carrying out the time domain conversion of the digital filter circuit, and obtaining a reverse Sallen-Key filtering function in a time domain; a reverse Sallen-Key filtering function in a time domain is adopted to carry out offset correction on peak center offset caused in the smoothing process of gamma energy spectrum data through the Sallen-Key filtering function, high fidelity of the Sallen-Key filtering function is achieved, and algorithm support is provided for data processing.

The application discloses a lithium ore granite pegmatite vein ore body precise positioning detection method and relates to the technical field of mineral resources exploration. The method circumscribes a first target area through regionalized exploration, then arranges a comprehensive detection profile in the target area, uses the spatial superposition constraint of four methods of high-density resistivity, time-domain induced polarization, ground gamma energy spectrum and portable X-ray fluorescence spectrum to exclude false anomalies of carbonaceous slate and feldspar veins, determines a continuous section meeting multi-condition coupling as a precise positioning target area, further generates a three-dimensional resistivity body and a polarization rate body based on multi-profile inversion data, extracts a resistivity equipotential surface to predict the spatial distribution of the pegmatite vein body, and designs a verification borehole. In the drilling verification link, a local natural mineral base material is compounded with an environment-friendly mud, layered adaptive drilling is adopted, drill cuttings-mud in-situ aerobic composting is carried out, and the composting products are backfilled and repaired in cooperation with local dominant plant seeds, so that rapid ecological restoration is realized.

The application discloses a hard rock type rare earth ore exploration method and system, relates to the technical field of mineral exploration, and comprises the following steps: according to geological scientific data of a target region, a prospecting prospective area in the target region is delineated based on a regional metallogenic prediction model; large-scale geological mapping and ground gamma energy spectrum measurement are carried out in the prospecting prospective area, lithology-structure information is superimposed, and a high radioactivity value target area is screened out; portable XRF detection is arranged in the high value target area, a rare earth element semi-quantitative result is used as a basis, and an ore-hosting geological body is delineated; CSAMT measurement is implemented on the ore-hosting geological body, electromagnetic data inversion is carried out, and low-resistance mineralized bodies and ore-controlling structures are determined; and based on the low-resistance mineralized bodies and the ore-controlling structures, slot exploration and drilling engineering means are used for field system exploration. The application can improve the ore-prospecting efficiency and accuracy.

The invention discloses a nuclide identification method based on KNN classification. The nuclide identification method comprises the following steps: 1) performing dimension reduction on original high-dimensional gamma energy spectrum data of a training sample by using a principal component analysis (PCA); 2) performing attribute reduction on gamma energy spectrum features of the training sample after PCA dimension reduction through a neighborhood rough set, and rejecting redundant features and retaining a feature set with the most discriminant ability through heuristic search based on attribute dependency; and 3) utilizing the feature set obtained in the step 2) to realize rapid nuclide identification of the to-be-detected sample through a K-nearest neighbor classification method. According to the method, PCA dimension reduction, attribute reduction and KNN classification methods are fused, high recognition precision can be kept, meanwhile, better calculation efficiency is achieved, and the method is suitable for portable equipment with limited resources to achieve real-time and accurate nuclide recognition.

The invention discloses a method and a device for predicting a leakage hazard range of a nuclear facility, and relates to the technical field of nuclear response emergency. The method comprises the following steps: acquiring reconnaissance data corresponding to a nuclear facility leakage area; performing energy spectrum preprocessing on the gamma energy spectrum original pulse signal to obtain processed energy spectrum data, and performing background deduction processing on the processed energy spectrum data based on an adaptive SNIP algorithm to obtain net energy spectrum data; performing nuclide identification processing according to the net energy spectrum data to obtain a nuclide identification result, and performing nuclide activity concentration calculation based on the nuclide identification result and the nuclear radiation reconnaissance data to obtain nuclide activity concentration; performing source item inversion based on geographic data, meteorological data and nuclide activity concentration to obtain leakage source item information; and obtaining a hazard range prediction result based on the meteorological data, the leakage source item information and the nuclide activity concentration. According to the invention, the sampling precision of the system can be improved, the pulse accumulation can be reduced, the accumulation discarding problem can be effectively solved, and the adaptability is higher.

The invention relates to a gamma radiation dose rate instrument which comprises a handheld host end, a main grip, an electric telescopic rod and a pluggable probe. A first sensor cluster is mounted in the pluggable probe; and a second sensor cluster is accommodated in the inner cavity of the main grip. In the implementation process, the first gamma probe and the second gamma probe collect gamma dose initial data, temperature and humidity data and voltage data in an area where the first gamma probe and the second gamma probe are located when receiving a collection instruction, and the collected data are sent to the handheld host end; the handheld host end is used for controlling front-back stretching and retracting of the electric telescopic rod, rotation of the electric universal joint and releasing / retracting of the electric rope. The processor is also used for issuing acquisition instructions to the first gamma probe and the second gamma probe; and when the gamma dose initial data, the temperature and humidity data and the voltage data are received, compensating the gamma dose initial data based on the temperature and humidity data and the voltage data, and generating and displaying a gamma energy spectrum diagram according to the compensated gamma dose data.

The application discloses a kind of uranium mine logging instrument based on ultrashort pulse neutron and working method thereof, it is related to uranium mine exploration well logging field;Logging instrument includes control communication nipple arranged in sequence along its axial direction, ultrashort pulse neutron generator for emitting fast neutron pulse with pulse width less than 1 microsecond to formation, shielding body, dual thermal neutron detection assembly for detecting thermal neutron and superhot neutron on spatially consistent measurement point, gamma detector for detecting non-elastic scattering gamma ray and capture gamma ray emitted by formation element, and fast neutron detector and multichannel synchronization and high-speed acquisition circuit for detecting and outputting source intensity monitoring signal of fast neutron pulse in real time;The logging instrument of the application emits ultrashort fast neutron pulse and detects neutron yield in real time, combines to obtain neutron time spectrum and multi-dimensional information of gamma energy spectrum with accurate time stamp, carries out high-precision, anti-interference inversion to formation uranium content, and efficiently and accurately obtains formation information.

The present application relates to the technical field of nuclear radiation, and discloses a nuclear medicine radioactivity purity online detection system based on energy spectrum analysis, which comprises a synchronous signal acquisition module, a real-time background suppression module for carrying out correlation screening on the gamma energy spectrum based on the environmental background radiation to obtain a background suppression energy spectrum of the nuclear medicine sample, a target peak shape extraction module, a dynamic response spectrum construction module for driving simulation of the target nuclide of the gamma energy spectrum based on the pure target peak spectrum and a preset detector response function to obtain a dynamic full response spectrum of the target nuclide, a dynamic spectrum contribution stripping module for carrying out contribution spectrum accurate stripping on the spectrum contribution of the target nuclide based on the background suppression energy spectrum and the dynamic full response spectrum to obtain a limit residual spectrum of the nuclear medicine sample, an impurity characteristic identification module and a radioactivity purity calculation module. The present application can improve the online detection efficiency of the nuclear medicine radioactivity purity based on energy spectrum analysis.

The application discloses a kind of gamma energy spectrum feature extraction method and system based on energy spectrum two-dimensional coding, belong to nuclear detection and energy spectrum signal processing technical field, this method includes: obtaining and pre-processing gamma energy spectrum data;One-dimensional energy spectrum sequence is mapped into two-dimensional energy spectrum matrix by two-dimensional coding;Local structure enhancement is carried out to two-dimensional energy spectrum matrix, multi-scale transformation, space feature compression and statistical feature embedding, and two-dimensional energy spectrum feature map is constructed;High-dimensional spectral feature expression is obtained by using feature extraction model to carry out multilevel processing to two-dimensional energy spectrum feature map;The high-dimensional spectral feature output is used for nuclide identification, element content inversion and other gamma energy spectrum analysis application.The application enhances the energy spectrum structure feature expression ability by two-dimensional coding mode, realizes the efficient, stable and fine use of energy spectrum information.

The application discloses a coal quality multi-element nondestructive analysis method based on a compact D-D neutron source, relates to the technical field of nondestructive testing, and solves the technical problem that the existing neutron activation analysis technology based on a nuclear reactor cannot quickly and accurately detect the content of each element in a coal sample due to high equipment cost, large size and complicated operation; the application prepares elemental samples of each element, collects pure gamma energy spectrum of the elemental samples by using a gamma detector, and constructs a single-element spectrum matrix; a simulated coal sample is prepared, and its pure gamma energy spectrum is obtained; based on the single-element spectrum matrix and the pure gamma energy spectrum of the simulated coal sample, the content of elements in the simulated coal sample is analyzed; the content of elements when the simulated coal sample is prepared is compared with the content of elements in the simulated coal sample obtained through analysis, and a test method for coal quality element information in reality is determined; and the application realizes quick and accurate detection of the content of multiple elements in a coal sample, which is crucial for the development and utilization of coal resources.

The invention relates to the field of neutron energy spectrum measurement, and provides a neutron energy spectrum measurement method and device based on characteristic gamma energy response, and the method comprises the steps: obtaining a counting rate and a corresponding energy response; discretizing continuous energy into a plurality of energy groups, and establishing a linear equation set by using an energy response function; carrying out iterative solution on the linear equation set to obtain a neutron energy spectrum; a neutron dose equivalent conversion factor can be expressed as linear superposition of an energy response function, and a contribution weight coefficient is obtained by adopting a weighted least square method; and calculating a first neutron dose equivalent rate based on the contribution weight coefficient and the counting rate, calculating a second neutron dose equivalent rate based on the neutron energy spectrum and the neutron dose equivalent conversion factor, carrying out comparison verification on the first neutron dose equivalent rate and the second neutron dose equivalent rate, and outputting the neutron energy spectrum as a final measurement result when the comparison verification is passed. On the basis of the single detector, the purpose of online real-time measurement of the neutron energy spectrum is achieved, and the accuracy and the reliability of a measurement result are improved.

The present application relates to a kind of based on ground gamma energy spectrum data's flight data quick simulation complementing method, comprising: arranging existing aerial gamma energy spectrum data in research area, the average height h of statistics measurement is extracted data missing range;Collect ground gamma energy spectrum data information in data missing area, and obtain the potassium, uranium, thorium count rate of ground 0 m height;The count rate data of ground 0 m height is gridded, and artificial generation flight path data is extracted and established ground 0 m height count rate database;Obtain height attenuation coefficient, the aerial sensitivity coefficient of height h;According to ground 0 m height count rate database, according to the response contribution of measuring point data in certain area, integral obtains simulated aerial count rate data;According to simulated aerial count rate data, obtain aerial gamma energy spectrum data.The present application can quickly complement the data of missing area, uses ground gamma energy spectrum measurement to replace aerial gamma energy spectrum measurement, greatly saves cost.

The invention discloses a precise irradiation system and irradiation method for neutron irradiation breeding, and the system comprises a thermal neutron source which is used for generating a thermal neutron beam; the capillary neutron lens is used for focusing the thermal neutron beam; the seed conveying device is used for adsorbing and conveying seeds, so that the embryo parts of the seeds are aligned with the beam focus position of the capillary focusing lens; a high-purity germanium detector and a collimator; the activation foil assembly is arranged at a position adjacent to the seed embryo part target region; the controller is respectively connected with the thermal neutron source, the capillary neutron lens, the vacuum adsorption type seed conveying device and the high-purity germanium detector, and is used for setting the pulse frequency of the thermal neutron beam and the conveying frequency of the seed conveying device according to the designed irradiation dose; and obtaining the neutron effective dose of the seed embryo target region based on the gamma energy spectrum in combination with inversion of an activated foil analysis method, and adjusting at least one beam parameter and / or the transmission frequency in real time according to the deviation between the neutron effective dose and the target dose so as to realize quantitative irradiation of the single seed embryo.

The invention relates to the technical field of detection instruments, and discloses a radioactive geophysical prospecting measurement device for prospecting, the radioactive geophysical prospecting measurement device for prospecting comprises a handheld gamma energy disperse spectroscopy and a grip, the two sides of the outside of a display screen are both provided with protective shells, the close sides of the two protective shells abut against each other, the rod wall of a rotating rod is fixedly sleeved with a connecting rod, and the connecting rod is connected with the handheld gamma energy disperse spectroscopy. And one end of the connecting rod extends to the inner side of the protective shell. According to the radioactive geophysical prospecting measuring device for prospecting, the device can be connected to an arm, the device is prevented from accidentally slipping out of the hand and falling to the ground as much as possible, the two rotatable protective shells are arranged, and when the handle is loosened, the device can automatically rotate to shield and protect the vulnerable part of the device, so that the device has high safety during use; through the micro motor and the electric push rod, the distance between the equipment probe and the to-be-measured ore body is shortened, the road holding force of the equipment is enhanced, the influence of topographic relief and ground surface soil, covering soil and particles on the detection precision of the instrument is reduced, and the precision of a measurement result is improved.