32 results about "TRACER" patented technology

Disclosed herein are radiation therapy systems and methods. These radiation therapy systems and methods are used for emission-guided radiation therapy, where gamma rays from markers or tracers that are localized to patient tumor regions are detected and used to direct radiation to the tumor. The radiation therapy systems described herein comprise a gantry comprising a rotatable ring coupled to a stationary frame via a rotating mechanism such that the rotatable ring rotates up to about 70 RPM, a radiation source (e.g., MV X-ray source) mounted on the rotatable ring, and one or more PET detectors mounted on the rotatable ring.

An imaging method and apparatus, the method comprising collecting detector output data from a radiation detector positioned near a subject provided with a radio-active tracer, and resolving individual signals in the detector output data by (i) determining a signal form of signals present in the data, (ii) making parameter estimates of one or more parameters of the signals, wherein the one or more parameters comprise at least a signal temporal position, and (iii) determining the energy of each of the signals from at least the signal form and the parameter estimates. The acceptable subject to detector distance is reduced or increased, spatial resolution is improved, tracer dose or concentration is reduced, subject radiation exposure is reduced and / or scanning time is reduced.

The invention provides a non-contact three-dimensional measurement device and a non-contact three-dimensional measurement method for the particle movement of a fluidized bed. Gamma ray detectors arranged in an orthometric manner at the same height capture tracer particles and give out gamma rays; the gamma ray detectors convert the gamma rays into electric signals; the electric signals are processed by a sensitive signal amplifier, a converter, a forward analogue-digital sampler and a lateral analogue-digital sampler to respectively generate a forward perspective view and a lateral perspective view; and then the three-dimensional movement process of the particles is reconstructed through a three-dimensional image reconstruction module. The measurement device and the method provided by the invention employ safe ray for imaging so that three-dimensional, real-time, accurate and safe measurement of the particle movement of the fluidized bed is realized without affecting a flow field.

The invention relates to a non-radioactivity tracing flow well logging method and process based on the pulse neutron technology in the oilfield production injection profile well logging technology. The non-radioactivity tracing flow well logging method and process based on the pulse neutron technology includes the steps of using a solution of a non-radioactive substance, such as a gadolinium compound or a boron compound, with a high heat neutron capture cross section as a tracing agent, using the neutron lifetime manner to measure the macroscopic capture cross section of fluid in a well, namely using high-strength pulse neutrons emitted by a pulse neutron generator to bombard the tracing agent, capturing heat neutrons by the tracing agent, using different well logging processes to record heat neutron time spectrums or the heat neutron counting rate of a fixed spacing detector, and calculating the flow speed of the fluid in the well and the use conditions of a thin difference layer by analyzing well logging data. The non-radioactivity tracing flow well logging method and process based on the pulse neutron technology is free of radiation risks, meets the environment-friendly requirement, is low in measuring lower limit, effectively solves the problem that an current layering injection well is low in flow and large in monitoring error, and has wide site adaptability.

The invention provides a radioactive xenon beta-gamma coincidence detector based on a laminated scintillator. According to the detector, a single photomultiplier is adopted to read the scintillation light of each scintillator, the beta-gamma coincidence measurement is realized based on the pulse waveform analysis, so that the great simplification of a traditional beta-gamma coincidence detector structure and the matched readout electronics is realized. Besides, the detector adopting the NaI (T1) and plastic scintillator cavity structure design is of a full-surrounding detection structure, thescintillators of all layers are proper in size, and the detector has the advantages of being high in detection efficiency and low in cost. The detector can be applied to the fields of the extremely important tracer nuclide and nuclear explosion event monitoring and the nuclear reactor operation safety monitoring in environmental effluent monitoring, the nuclear accident leakage level evaluation, etc., and can also be applied to the radioactivity monitoring of a leaked gas in the processes of medical isotope production, spent fuel storage places, nuclear material aftertreatment and the like.

The invention discloses a crack body density quantitative calculation method based on neutron activation analysis self-shielding correction. The crack body density quantitative calculation method comprises the steps that tracer elements with high thermal neutron capture cross sections are added into a propping agent, capture gamma-ray energy spectra before and after fracturing construction are measured through a pulsed neutron instrument, and a measured value of fracture body density after fracturing is obtained; the capture gamma-ray energy spectra before and after fracturing are analyzed based on an instantaneous gamma neutron activation analysis technology; elements with invariable contents before and after fracturing are extracted and any one element from the elements is elected, and aself-shielding correction factor is calculated by utilizing a characteristic peak counting ratio before and after fracturing of the element; a true value of the self-shielding correction factor is determined by performing self-shielding correction on a measured value of characteristic peak counting of the tracing element; and numerical fitting is carried out on the true value of the characteristic peak count of the tracing element and the fracture body density to determine a fracture body density quantitative calculation formula. According to the crack body density quantitative calculation method based on the neutron activation analysis self-shielding correction, the saturation effect caused by self-shielding is eliminated, the crack response sensitivity is further improved, and the quantitative calculation of the crack body density is realized.

The invention relates to the discrimination of spectroscopically different tracer materials by magnetic particle imaging (MPI), based on the differences of the MPI spectral responses of said tracer materials.

A method for evaluating induced fractures in a wellbore includes obtaining a first set of data in a wellbore using a downhole tool. The method also includes pumping a first proppant into the wellbore after the first set of data is obtained. The first proppant includes a first tracer that is not radioactive. The method also includes pumping a second proppant into the wellbore. The second proppant includes a second tracer that is not radioactive. The second tracer is different than the first tracer. The first proppant and the second proppant flow into fractures in the wellbore. The method also includes obtaining a second set of data in the wellbore using the downhole tool after the first and second proppants are pumped into the wellbore. The method also includes comparing the first and second sets of data.

A method for evaluating induced fractures in a wellbore includes obtaining a first set of data in a wellbore using a downhole tool. The method also includes pumping a first proppant into the wellbore after the first set of data is obtained. The first proppant includes a first tracer that is not radioactive. The method also includes pumping a second proppant into the wellbore. The second proppant includes a second tracer that is not radioactive. The second tracer is different than the first tracer. The first proppant and the second proppant flow into fractures in the wellbore. The method also includes obtaining a second set of data in the wellbore using the downhole tool after the first and second proppants are pumped into the wellbore. The method also includes comparing the first and second sets of data.

The invention provides an advanced dynamic forecasting method applying an isotope to tracing a rock mass water flowing channel. The advanced dynamic forecasting method comprises the following steps that pilot drilling is carried out in front of tunneling to form a logging well, and a filter tube is arranged in the logging well; a radioactive isotope tracer is put into the filter tube, a seepage principle is used for permeating water flows, and the flow velocity and the flow rate of water are measured; and an inspection logging well is drilled in front of the water flows, the distribution condition of the water flowing channel is reversely obtained through the determination of the isotope concentration and recording of the water quantity in the inspection logging well, and the feed relationof water of the water flowing channel is determined through the change of the isotope concentration of water flowing into the logging well.

The invention discloses an engine internal flow field measuring system and a measuring method thereof. The method comprises the steps of preparing a grain of a solid rocket engine through employing aradioactive isotope raw material, generating a large amount of high-speed high-temperature fuel gas after the grain is ignited to form a flow field, generating plume through the spraying of a sprayingpipe, and enabling radioactive isotope particles to release gamma rays when the radioactive isotope particles flow along with the flow field, and using the gamma ray dynamic collector for collectingreleased gamma rays to measure the dynamic characteristics of the internal flow field of the solid rocket engine. The measuring system uses radioactive isotopes as tracer particles to achieve non-contact measurement of the internal flow field of the solid rocket engine, and compared with a traditional measuring method, the original structure of the solid rocket engine does not need to be damaged,the problem that a traditional measuring method disturbs an internal flow field can be avoided, and compared with an existing numerical calculation method, the defect that the numerical calculation result is insufficient in accuracy can be overcome.

The invention relates to the technical field of space free volume measurement, in particular to a space free volume measurement method which comprises the following steps: step 1, enabling the pressure boundary of a to-be-measured space to be in a sealed state, and measuring the background concentration C0 of tracer gas in the to-be-measured space; 2, according to the determined tracer gas injection concentration Cin, the determined tracer gas injection flow qin and the determined tracer gas injection time tin, injecting tracer gas into the to-be-measured space; 3, continuously sampling for multiple times according to the determined sampling interval time ts, analyzing the concentration of the tracer gas of the sample, and continuously sampling for at least ten times according to the sampling interval time ts after the diffusion of the tracer gas in the to-be-measured space is confirmed to meet the mixing uniformity condition for the first time; 4, establishing a tracer gas average concentration growth curve according to the tracer gas concentrations of all the samples and the sampling time, and obtaining the tracer gas average concentration in the to-be-measured space; and 5, calculating the free volume Vi of the to-be-measured space. The method has the advantages of high accuracy, strong operability and good applicability.

Methods and systems of testing for a gas leak between an inlet zone and an outlet zone of a gas flow component in a shut state are provided. Different tracer and carrier gases are used. The carrier gas is circulated through the outlet zone of the gas flow component to purge the tracer gas from this outlet zone. A spectroscopic emission from the carrier gas indicative of an amount of the purged tracer gas is monitored. A test flow of the tracer gas is introduced in the inlet zone of the gas flow component, and the inlet pressure is increased for successive pressure increments. The presence of a gas leak is determined upon detecting an intensity step variation in the monitored spectroscopic emission following one of the pressure increments in the inlet pressure.

The invention provides a method for preparing tracing ceramsite. The method comprises the following steps: feeding a neutron trapping material into a ball mill, then adding bauxite into the ball mill, and grinding to obtain mixed ground powder; feeding the mixed ground powder into a granulator for granulation, and after granulation is completed, carrying out screening treatment; and after screening is completed, feeding into a rotary kiln, roasting, cooling after roasting, and screening a finished product. The tracing ceramsite is used for detecting the width of the formation fracturing cracks. The method comprises the following steps: injecting the prepared tracing ceramsite into a formation crack to be detected; emitting high-energy fast neutrons into a stratum by utilizing a tracer ceramsite matched detection instrument, and detecting thermal neutrons which are not captured by the stratum after the fast neutrons are decelerated by the stratum; and detecting the 2160 [mu]s thermal neutron counting rate after the fast neutron beam is emitted by using long and short source spacing detectors, and calculating the macroscopic neutron capture cross section of the stratum according to the recorded neutron data of each channel. According to the method, the crack width of the stratum can be effectively, accurately and quantitatively determined.

The invention provides an underground water flowing property detection device and detection method, and belongs to the technical field of underground water detection. The detection device comprises afirst mounting piece, a direction indicating piece, a deflection piece, an ultraviolet light source and a camera shooting piece. The deflection piece is connected to the first mounting piece and is used for deflecting under the action of water flow. The direction indicating piece is arranged on the first mounting piece, and the indicating direction of the direction indicating piece is kept unchanged all the time. Both the direction indicating piece and the deflection piece are provided with fluorescent marks. The ultraviolet light source and the camera shooting piece are both arranged on the first mounting piece, and the camera shooting piece is used for recording the positions of the direction indicating part and the deflection piece and measuring the water flow direction of underground water to be measured through the included angle between the direction indicating piece and the deflection piece when the deflection piece rotates to be parallel to the flow direction of the undergroundwater to be measured. The detection device is simple in structure, the detection method is convenient and fast, complex calculation is not needed, and radioactive elements or other tracers do not need to be independently added in the measurement process.

The invention discloses a method and system for measuring the free volume of a room of any shape. The method comprises steps that the mass of gas of a preset volume in a to-be-measured room is measured; tracer gas is added into the to-be-detected room; the mass of the gas with the same volume as the preset volume in the to-be-measured room is measured after the tracer gas is added; and the free volume of the to-be-measured room is calculated. The system comprises a first measurement unit for measuring the mass of a gas of a preset volume; a tracing unit which is used for adding tracing gas; asecond measuring unit which is used for measuring the gas mass of a preset volume; and a calculation unit which is used for calculating the free volume of the to-be-measured room. The system is advantaged in that the tracer gas method is adopted, the volume of the free volume is measured through the change of the injected mass volume of the tracer gas, the test period of original iterative computation is greatly shortened, the measurement workload of the volume of sundries in the free volume in iterative computation is reduced, and measurement precision of the free volume is improved.

The invention discloses a method for measuring air exchange volume, comprising: S1, injecting a tracer gas into a space to be measured by a constant injection method; S2, measuring the concentration of the tracer gas in the space to be measured, and determining the concentration according to the concentration Whether the tracer gas in the space to be tested is mixed with the air in the space to be tested evenly; S3. After confirming that the tracer gas in the space to be tested is mixed with the air in the space to be tested evenly, take a gas sample in the space to be tested and record At the sampling time, measure the concentration of the tracer gas in the sampled gas; S4, perform function fitting on the corresponding relationship between the concentration of the tracer gas in the sampled gas and the sampling time, to obtain a fitting function; S5, according to the fitting function and the injection amount of the tracer gas in the space to be tested, and calculate the air exchange rate of the space to be tested. The method and system provided by the invention can accurately measure the air exchange volume of a single space related to safety by using the constant injection method.

The invention provides a method for treating spontaneous combustion of residual coal in a gob-side entry retaining goaf. The method comprises the following steps that tracer gas is released at the corner of an air inlet roadway, and an air leakage channel is determined; according to the air leakage channel, in combination with the general situation of a coal face, software is adopted for simulation, and a high-temperature area of the goaf is determined; an infrared detection system is adopted for detecting a radiation temperature field of the residual coal in the goaf, and a surface temperature distribution diagram of the goaf is obtained; a sound wave testing system is adopted for detecting and analyzing sound wave information within the range of the high-temperature area in the surface temperature distribution diagram of the goaf, and an abnormal area in the goaf is determined; the overlapping area of the high-temperature area of the goaf and the abnormal area in the goaf is determined as a spontaneous combustion area of the residual coal in the gob-side entry retaining goaf; the air leakage channel is subjected to leakage stoppage; and the spontaneous combustion area of the residual coal in the gob-side entry retaining goaf is subjected to construction drilling, and a fire extinguishing material is poured.

The present invention proposes a non-contact three-dimensional measurement device and measurement method for particle movement in a fluidized bed. The gamma ray detector placed orthogonally at the same height captures tracer particles and emits gamma rays, and the gamma ray detector converts the gamma rays Rays are converted into electrical signals, processed by sensitive signal amplifiers, converters, forward analog-digital samplers, and lateral analog-digital samplers to produce front perspective views and side perspective views respectively, and then the particles are reconstructed through the three-dimensional image reconstruction module three-dimensional motion process. The invention adopts safe ray imaging to realize three-dimensional, real-time, accurate and safe measurement of particle motion in the fluidized bed without disturbing the flow field.

The invention discloses a measurement system and a measurement method for the internal flow field of the engine. The powder column of the solid rocket motor is prepared by using radioactive isotope raw materials. Plume, radioactive isotope particles release γ-rays when they flow with the flow field, and use the γ-ray dynamic collector to collect the released γ-rays to measure the dynamic characteristics of the internal flow field of the solid rocket motor. The above-mentioned measurement system uses radioisotopes as tracer particles to realize Compared with the traditional measurement method, the non-contact measurement of the internal flow field of the solid rocket motor does not need to destroy the original structure of the solid rocket motor, and can avoid the disturbance of the internal flow field by the traditional measurement method. Compared with the existing numerical calculation method In comparison, it can overcome the shortcomings of insufficient accuracy of numerical calculation results.

The invention discloses a high-efficiency zero-radioactive emission logging tracer and a preparation method thereof, comprising the following steps: in a reaction container of a stirrer, radioisotopes are uniformly adsorbed by a porous carrier added with an impregnating agent; the radioactive solution is transferred to a sealed storage tank. In the liquid tank, the porous carrier adsorbed with most of the radioactive isotopes is blocked in the reaction vessel of the stirrer by the porous sieve plate; the porous carrier after the radioactive solution is filtered out by heating and drying; the organic solvent organic bag is added into the reaction vessel of the stirrer. The volatilized iodine gas and water vapor are adsorbed by the porous carrier filled in the exhaust pipe for the preparation of the next batch of logging tracers; when the next batch of logging tracers is circulated for preparation, the The porous carrier adsorbed with the radioactive gas, the radioactive liquid in the liquid storage tank and the supplemented radioactive liquid are successively transferred into the reaction vessel of the stirrer. Radioactive iodine-131 is completely used, with zero efflux, which is environmentally friendly and low-cost.

A method of detecting a tracer compound dissolved in a liquid composition via surface-enhanced spectroscopy includes the steps of:a. optionally, diluting the liquid composition or the separated liquid by mixing with a diluent liquid;b. bringing a sample of the separated liquid into contact with, a spectroscopy-enhancing surface including gold, silver or copper;c. obtaining a Raman spectrum from the sample; andd. calculating, from the spectrum, the concentration of the tracer in the sample relative to the concentration of a second component of the composition.

The present disclosure provides an advanced dynamic prediction method using isotope tracer rock mass water-conducting channel. Pilot drilling is carried out in front of tunnel excavation to form well logging, and filter pipes are set in the well logging; radioactive isotope tracers are put into the filter pipes to use The principle of seepage The water flow infiltrates and measures the flow velocity and flow rate of the water; the inspection logging is drilled in front of the water flow, and through the measurement of the isotope concentration in the inspection logging and the record of the water volume, the distribution of the water conduction channel is inversely deduced, and through the inflow logging The change of the isotope concentration of the water determines the water supply relationship of the aqueduct.

The invention relates to a jet type double water holding tracer logger. The jet type double water holding tracer logger comprises a measuring circuit nipple, a liquid storage cylinder, a measuring cylinder and a motor push-pull nipple which are successively connected, wherein a liquid storage chamber is formed in the liquid storage cylinder, the liquid storage chamber contains oily tracer liquid,and a measuring chamber is formed in the measuring cylinder; the inner part of the liquid storage chamber is provided with a push-pull piston, the end part of the liquid storage chamber is provided with a jet nozzle, and the liquid storage chamber is connected to the measuring chamber through the jet nozzle; and the side walls of the measuring cylinder are respectively provided with a liquid inletand a liquid outlet, the inner part of the measuring chamber is provided with a first water holding probe and a second water holding probe, and the first water holding probe and the second water holding probe are connected to a ground acquisition system through measuring circuits. The jet type double water holding tracer logger adopts the non-radioactive oily tracer liquid which is safe and reliable, and has no pollution; and in addition, the test probes adopted by the jet type double water holding tracer logger has a smaller size and higher measurement accuracy.

The invention provides a method for controlling spontaneous combustion of coal leftover in a gob-side entry retaining gob, comprising the following steps: releasing tracer gas at the corner of an air inlet roadway to determine an air leakage channel; according to the air leakage channel, combined with coal mining work Use software to simulate and determine the high temperature area of ​​the goaf; use the infrared detection system to detect the radiation temperature field of the coal left in the goaf, and obtain the surface temperature distribution map of the goaf; use the acoustic wave test system to detect and analyze the goaf The sound wave information of the high temperature area in the surface temperature distribution map is used to determine the abnormal area inside the gob; the overlapping area of ​​the high temperature area in the gob and the abnormal area inside the gob is determined as the coal leftover in the gob retaining gob. Spontaneous combustion area; plugging the air leakage channel; drilling holes in the spontaneous combustion area of ​​coal left in the gob-retaining gob area, and pouring fire-extinguishing materials.

The invention provides a novel radioactive radiation tracer, which belongs to the field of radioactive radiation tracers, and comprises a tracer main body, two sliding grooves are symmetrically formedin two sides of the top of the tracer main body, sliding blocks A are slidably connected in the sliding grooves, and mounting seats A are fixedly connected to the tops of the sliding blocks A. According to the invention, a pull ring is pulled to enable two rotating pieces to rotate in opposite directions, so that the two sliding blocks A slowly get close to each other along the direction of a guide rod; a rack enables a gear and a rotating shaft to rotate to enable a sliding block B to compress and shorten a reset spring, so that the telescopic end of a piston rod is shortened until the tracer body is pulled up, the tracer can be pulled up to be carried, and inconvenience caused by the fact that a worker holds the tracer with two hands to move the tracer can be avoided; and the falling probability of the tracer in the carrying process of the tracer is effectively reduced, so that the service life of the tracer is prolonged.

The invention provides a method for quickly testing Rb-Sr isotopes in rock samples. The method is to dissolve and dilute the high-purity Rb and Sr samples from rock samples to an appropriate concentration of sample liquid by hydrochloric acid; then take an appropriate amount dilute phosphoric acid and TaF 5 The emitter is coated on the surface of the high-purity Re filament in turn, and after being evaporated to dryness, the Sr and Rb sample solutions are successively coated, and after being evaporated to dryness, it is tested by a thermal ionization mass spectrometer, and the ionization temperature is adjusted to 600-720°C, and the Rb isotope is tested first, and then Adjust the temperature of the filament to 1300°C and keep it for 2-3 minutes to burn off the trace Rb sample coating on the surface of the filament, and finally adjust the temperature of the filament to 1350-1500°C to test the Sr isotope. This method realizes the high-precision measurement of rubidium, strontium element concentration and strontium isotope ratio on the same filament, greatly improves the testing efficiency, and at the same time greatly reduces the testing cost and labor consumption, and has a wide range of applications for geochronology and geochemical tracer research prospect.