31 results about "TRACER" patented technology

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.

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 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.

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 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 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.