88 results about "Isotopologue" patented technology

Systems and methods described herein provide for charge state control of multiply-charged anions in a front end, high pressure ion guide. In some example aspects, a mass spectrometer system is provided comprising a first vacuum chamber (121) maintained at a pressure above about 500 mTorr. At least one ion guide (106) is disposed within the first vacuum chamber, the at least one ion guide comprising a plurality of rods extending along a central longitudinal axis. A controller (193) is configured to adjust an amplitude of an RF voltage signal provided to the plurality of rods so as to alternatively operate the ion guide in a first mode of operation with a lower amplitude of the RF voltage signal so as to reduce the likelihood of charge reduction by electron detachment so as to substantially maintain the isotopic distribution of the ions during transmission of ions through the ion guide, and a second mode of operation with a higher amplitude of the RF voltage signal so as to increase the likelihood of electron detachment from ions being transmitted therethrough.

The application discloses a kind of gas isotopic ratio measurement system and method, it relates to gas isotopic measurement technical field, in the system, double-layer sealed panning gauge is used to obtain the mixed gas to be measured, after energization, make the mixed gas to be measured occur panning discharge, produce the light signal containing each isotopic characteristic spectrum;Double-layer sealed panning gauge includes gauge tube, coaxially arranged inner layer sealing structure and outer layer sealing structure;Lens group is used to collect and focus light signal;Optical fiber is used for remote transmission light signal collected by lens group;Spectrometer is used for the light signal transmitted by optical fiber is spectrally resolved, forms the spectrum according to wavelength development;Photoelectric detector is used to convert spectrum into electrical signal;Computer is used to determine the proportion of each isotopes in the mixed gas to be measured according to electrical signal.The application realizes redundancy protection by double-layer sealing structure, ensures that discharge condition is stable under harsh environment, prevents gas leakage, realizes high-precision and safe measurement of gas isotopic ratio under high-risk scene.

The present invention relates to a method for separating and enriching a chlorine-37 isotope using a laser photochemical reaction and, specifically, to a method for separating and enriching a high-purity chlorine-37 isotope, which is essential for a next-generation molten chloride fast reactor (MCFR) and the like, by selectively photolyzing specific isotopic molecules of iodine monochloride (ICl) using a high-power fiber laser or a solid-state Raman laser and reacting same with a radical scavenger to effectively terminate a chain reaction. Accordingly, by employing, as a light source, a single-frequency fiber laser or a solid-state Raman laser that has higher power efficiency and easier maintenance than conventional dye lasers and is capable of achieving high power of several kW or more through modular expansion, mass production on an industrial scale can be realized and the economic feasibility of the process can be significantly secured.

The present application relates to a kind of groundwater organic pollution tracing analysis method and system based on isotope, the method comprises: collecting the pollutant parameter of monitoring point in multiple time intervals;Build target monitoring point set;Its coverage area is called target area;Based on typical time interval, the pollutant parameter of each monitoring point in analysis target monitoring point set is found to obtain the contour line corresponding to pollutant parameter type;The area in the contour line of each pollutant type high pollutant parameter is regarded as suspected area;Determine target pollution source in suspected area based on isotope parameter.The present application fully utilizes big data monitoring resources from space and time, combines pollutant parameter itself and optimally uses isotope analysis resources, and the tracking of pollution source is guided to provide efficient multi-source burst differentiating pollutant tracing.

This invention discloses an isotope abundance detection method and system based on the centroid method of emission spectroscopy, belonging to the fields of analytical chemistry and spectroscopic analysis technology. This method measures the centroid position of the atomic spectral lines or molecular spectral bands of the target element, utilizing the quantitative relationship between the centroid position and isotope abundance to achieve rapid, accurate, and low-cost detection of isotope abundance. This invention is the first to systematically establish a complete theoretical framework for the use of the centroid method of emission spectroscopy for isotope abundance detection, revealing the strict linearity conditions between the centroid and abundance, as well as the sources of error. This method is applicable to various excitation sources such as microwave plasma, inductively coupled plasma, and laser-induced breakdown plasma, covering both atomic and molecular spectroscopy detection modes, significantly reducing the resolution requirements of the spectrometer and exhibiting good noise interference resistance. This invention can be widely applied in fields such as nuclear engineering, semiconductor industry, environmental science, geochemistry, and medicine.

An irradiation target for the production of radioisotopes comprises a plurality of plates having aligned central openings. First and second elongated central members extend in opposite directions through the aligned central openings of the plates. The first and second elongated central members each have a pair of wings at first and second ends of the plurality of plates, respectively. The first and second elongated central members further have a pair of tabs adjacent to the wings of the other elongated central member. Tabs of the first elongated central member are bent to engage one end face of the plurality of plates. Tabs of the second elongated central member are folded over the wings of the first elongated central member. The plates and the first and second elongated central members are formed of materials that produce molybdenum-99 (Mo-99) by way of neutron capture.

The application discloses a mass spectrometer for measuring a low-isotope-content sample and belongs to the technical field of mass spectrometers. The mass spectrometer comprises a receiving device and a signal processing unit. The receiving device comprises a vacuum cavity, a metal target, a vacuum plastic flash body, a high-voltage electrode plate, a vacuum glass window, a photomultiplier tube and a photomultiplier tube cover. The signal processing unit comprises a high-voltage stabilizer and a pulse amplifier. The application converts ions into secondary electrons through the metal target, provides voltage for the metal target and the high-voltage electrode plate by the high-voltage stabilizer to form a high-intensity electric field, accelerates the secondary electrons to bombard the vacuum plastic flash body to generate an optical signal, receives and converts the optical signal into a pulse signal by the photomultiplier tube through the vacuum glass window, and finally performs shaping, amplification and conversion processing on the pulse signal by the pulse amplifier. The application does not need to rely on imported super-high resistance resistors, realizes the localization of the receiving device of the mass spectrometer, and has the advantages of high signal conversion efficiency, strong anti-interference capability, stable and reliable measurement and the like.

The application relates to the technical field of isotope detection, in particular to an isotope abundance and ratio detection device and method based on molecular emission spectrum. The device comprises a computer and a long-pulse laser unit, an optical path transmission unit, an LED illumination focusing unit, a three-dimensional displacement table and a spectrometer connected with the computer. The existing viewpoint considers that long-pulse laser is not conducive to micro-area excitation and high-resolution spectrum acquisition due to its wide pulse width, and is less applied in isotope subtle spectral line difference identification. The application breaks through the molecular emission cascade mechanism, enhances the signal intensity, realizes the possibility of micro-area high-resolution isotope molecular detection, generates plasma by in-situ laser ablation, induces molecular emission spectrum, realizes rapid, accurate and real-time in-situ detection of the isotope abundance and ratio in the sample. The device has few optical elements, simple structure and convenient optical path adjustment, and is conducive to miniaturization and on-site application promotion.

An irradiation target for the production of radioisotopes, having at least one plate defining a central opening, and a first elongated central member passing through the central opening of the at least one plate so that the at least one plate is retained thereon, wherein the at least one plate and the first elongated central member are both formed of materials that produce molybdenum-99 (Mo-99) by way of neutron capture.

The invention relates to a radioisotope tracer strain clamp cavity grease injection amount detection system and method, and provides a method for preparing electric grease containing a low-energy gamma-ray isotope tracer agent, injecting the electric grease into a strain clamp cavity, sealing, scanning in a lead shielding detection cabin by using a high-resolution sodium iodine detector, and detecting the grease injection amount of the strain clamp cavity. And the grease thickness of each area is calculated according to the Lambert-Beer law, and the total grease injection amount is obtained through accumulation. According to the method, non-contact measurement is adopted, the detection sensitivity reaches 0.01 ml, the method is suitable for detecting small-size cavities and is particularly suitable for complex shapes such as deep holes and narrow slits, and the problem of low resolution in the prior art is solved; in addition, the radiation dose in the detection process is lower than 0.1 mu Sv, safety is ensured, the quality control risk is reduced, and the maintenance reliability of the power system is improved.

The application discloses a low-gas mine gas emission abnormal source precision detection and treatment method, which is used for solving the problem of low-gas mine gas abnormal emission. First, the monitoring points and the monitoring point positions are determined, and all gas monitoring data are obtained through a mine monitoring system; data analysis is carried out based on SPC control chart theory, and a gas emission data anomaly criterion is established; the gas emission state is judged through the SPC control chart method, the gas emission abnormal area position is determined, and early warning is carried out; according to the determined gas emission abnormal area, the isotopic analysis method is used to detect the gas emission source and composition; finally, the gas emission abnormal source analysis result is tracked, targeted gas source classification treatment measures are formulated, and then the treatment effect test is carried out. The application can effectively control the low-gas mine gas emission abnormal risk, thereby improving the safety of coal mining.

The invention relates to a system for determining cellular respiration and nutrient metabolism of living cells or tissues, the system comprising: a cell container configured to receive and maintain a biological sample; a gas volume in fluid communication with the cell container, the gas volume containing gaseous components produced by metabolic activity of the biological sample; an optical detection unit configured to detect a target gas species in the gas volume by wavelength-selective absorption spectroscopy, the optical detection unit being further configured to distinguish between different isotopic species of the target gas species, the optical detection unit comprising an illumination source and detector arrangement optically coupled to the optical detection unit and configured for measurement of absorption signals corresponding to different isotopes of the target gas species; and an electronic control and evaluation unit operatively connected to the optical detection unit, the electronic control and evaluation unit being configured to acquire and process absorption data, determine absolute values and / or temporal variations of the target gas species concentration and isotopic composition, and output respiration-related parameters of the biological sample. In this way, a system is provided that enables precise and efficient determination of carbon dioxide produced by living cells or tissues under physiological conditions.

The invention discloses an isotope production method of a pneumatic conveying type coating target material ball. The method comprises the following steps: putting a coating target ball into an absorption ball pore channel of a reflecting layer of a pebble-bed high-temperature gas cooled reactor for irradiation; after irradiation is completed, the coating target balls are conveyed back to the ball storage tank through a pneumatic conveying system; transferring the coated target balls after irradiation in the ball storage tank to a post-treatment hot chamber; and in a post-treatment hot chamber, dissolving and separating the coating of the coating target ball containing the target isotope to obtain a dissolving solution, and purifying the dissolving solution to obtain an isotope solution. Based on an existing secondary shut-down system engineering design scheme and a remote control technology, full-sealing and remote automatic operation of a target ball are achieved for isotope production, the risk that personnel make contact with radioactivity is reduced to the maximum extent, and normal power generation operation of the pebble-bed high-temperature gas cooled reactor is not affected.

A method for analyzing light n-alkane components and carbon isotopes in deep and ultra-deep source rocks includes: (S1) subjecting a 5 A molecular sieve column to aging; (S2) pyrolyzing a source rock; and allowing a pyrolysis product to enter the 5 A molecular sieve column; where n-alkanes are adsorbed and retained by the 5 A molecular sieve column; allowing an outflow to pass through a dividing plate and an empty column or a weak polarity column to be discharged; and (S3) performing programmed heating such that the n-alkanes adsorbed on the 5A molecular sieve column are successively desorbed according to molecular weight, and then pass through the dividing plate and the HP-5 or DB-5 column to enter a mass spectrometer for composition analysis or isotopic analysis.

The invention discloses a device suitable for isotope separation and a sealing structure thereof, and relates to the field of isotope separation.The device comprises a supporting table and an ion acceleration pipeline fixedly installed at the top end of the supporting table, one end of the ion acceleration pipeline is communicated with an ion source, and the outer side of the ion acceleration pipeline is sleeved with a spiral cooling pipe in the length direction; one end of the spiral cooling pipe is connected with a pump body, the pump body is connected with a heat exchange pipe, and a cooling circulation system composed of the spiral cooling pipe, the pump body, the heat exchange pipe and the cooling water tank can rapidly take away heat generated during operation of the ion acceleration pipeline, the heat dissipation efficiency is higher, and when the first moving seat and the second moving seat move in the length direction of the spiral cooling pipe, the heat dissipation efficiency is higher. Wind power generated by the fan is evenly blown to the ion acceleration pipeline and the spiral cooling pipe through the exhaust port, auxiliary cooling of the ion acceleration pipeline is achieved, and meanwhile it can be prevented that condensate water is generated on the surface of the spiral cooling pipe due to too low temperature.

The invention discloses an isotope analysis method based on cooperation of a nonlinear spectrum and a laser ablation technology, the isotope analysis method comprises a nonlinear spectrum detection module and a laser ablation module, the laser ablation module can ablate a solid sample to generate plasma, and in the nonlinear spectrum detection module, the laser ablation module is used for ablating the solid sample to generate plasma; the laser output by the wavelength tunable continuous laser is divided into three laser beams, two laser beams are reversely and collinearly transmitted, the other laser beam intersects with the other two laser beams at a small angle, the focuses of the three laser beams coincide in the plasma generated by the laser ablation module, the wavelength of the wavelength tunable continuous laser is scanned, the power of the three laser beams is repeatedly adjusted, and the laser ablation is completed. And recording signal intensities at different wavelengths to obtain a nonlinear spectrum, fitting the spectrum by using a Lorentz function, calculating a signal integral intensity ratio of different isotopes, carrying out root marking on the ratio to obtain an isotope abundance ratio, and calculating the isotope abundance ratio according to the isotopic abundance ratio. The problem that current solid sample isotope analysis needs a complex sample preparation process can be solved.

A failed fuel pin emits cesium into the primary sodium coolant and xenon into the cover gas in a reactor vessel (402). A pipe (408) containing radioactive liquid sodium accepts flowing primary sodium from the reactor vessel. A radiation detector (416) is positioned adjacent the pipe such that gamma radiation emitted from the pipe can be measured. The pipe may be isolated to increase detection limits by allowing short-lived isotopes to decay. The isotopic ratio of 137Cs / 134Cs can be measured, which can be used to determine the burnup of a fuel assembly from within the core, and therefore, the failed fuel assembly can be identified based at least in part on the burnup. Further, mass spectrometry may be used to measure the ratio of a stable and unstable xenon isotope. The identification techniques may be used in conjunction to quickly identify a failed fuel assembly in-situ and during reactor operation.

The application relates to the field of environmental science and technology, and discloses a fine-source analysis method for atmospheric pollutants combining computational chemistry and isotopes, which comprises the following steps: constructing an isotopic data set, simulating a target pollutant molecular configuration, constructing an isotopic fractionation paradigm equation, correcting local isotopic fractionation, tracing the generation mechanism of a target pollutant in a typical region, and optimizing source analysis of the target pollutant in the typical region. In this way, based on computational chemistry, the density functional theory and the U-B-GM model are coupled, the isotopic fractionation paradigm equation is constructed for a preset reaction path, the specific isotopic fractionation value or fractionation coefficient is accurately simulated in combination with atmospheric environmental parameters during observation, and a local isotopic fractionation correction scheme is established accordingly; the correction scheme is oriented towards fine-source analysis, and can accurately identify the generation mechanism and pollution sources. In this way, the uncertainty of source analysis can be effectively reduced, and fine tracing of the sources of atmospheric pollutants can be realized.

Process, Apparatus and System for the Production, Separation and Purification of Radioisotopes for medical, industrial, agricultural and energy applications.

The invention provides an experimental method for determining stable carbon and oxygen isotopes by a two-way sampling method, and relates to the technical field of stable isotope analysis. The experimental method comprises the following steps: selecting carbon dioxide gas with the purity of more than 99.999% as carbon dioxide reference gas, and selecting a calcium carbonate carbon and oxygen isotope standard substance and a target sample to be measured; and then the stable carbon and oxygen isotopes are determined through a two-way sample introduction method, standard gas does not need to be purchased, the isotope ratio of a sample relative to a standard substance is obtained through conversion application of a formula, finally, the isotope ratio is successfully calibrated to the value of international standard PDB, and the experiment cost is saved. The method can be widely applied to other stable isotope two-way sample introduction methods, principle communication is achieved, and determination can be conducted through the experimental method under the condition that no standard gas exists.

The present application belongs to the technical field of geochemistry, and particularly relates to the estimation of the carbon flux of the earth system, and especially relates to a method and system for estimating the carbon flux of the deep-time earth system. The method for estimating the carbon flux of the deep-time earth system provided by the present application solves the four defects in the traditional technology caused by the fixed carbon pool assumption, the neglect of the atmospheric / biosphere carbon content, the isotopic error, and the failure to consider the fractionation effect through dynamic carbon pool segmentation, the inclusion of multi-sphere isotopic composition, and the correction of fractionation effect. The high-precision and verifiable model framework not only improves the scientificity of the deep-time carbon cycle research, but also provides a key tool for analyzing the climate evolution mechanism in the geological history period and predicting the future climate change trend, and has important theoretical innovation and practical application value.

There is provided a method of analysing isotopes of an element present in a compound of interest from a mass spectrum obtained by a Fourier transform mass spectrometer. The method comprises generating simulated transients that would be measured in the mass spectrometer when measuring a sample of the compound of interest at one or more selected resolutions of the mass spectrometer, the simulated transients corresponding to samples of the compound of interest with different relative isotopic abundances. The simulated transients are processed to produce respective simulated mass spectra data. The simulated mass spectra data are compared to theoretical mass spectra data to determine a correction to be applied to real mass spectra data to account for changes in isotopolog peak sizes caused by interference between unresolved isotopolog peaks.

The invention discloses a nuclear waste multi-isotope extraction method, an ultra-wide temperature range nuclear battery preparation method and an ultra-wide temperature range nuclear battery preparation system. The nuclear waste multi-isotope extraction method comprises the following steps: 1, crushing operation; 2, sequentially carrying out three-stage gradient extraction on the nuclear waste activated powder by adopting a double crown ether / ionic liquid composite extraction system, a di (2-ethylhexyl) phosphoric acid / tributyl phosphate composite extraction system and a di-isodecyl phosphoric acid / polyethylene glycol 400 composite extraction system; and 3, purification operation. According to the method, mechanical crushing is matched with high-frequency ultrasonic treatment, so that sufficient crushing and surface activation of nuclear waste are realized, and the effect of remarkably improving the subsequent extraction reaction rate and selectivity is achieved. On the basis, the Cs-137, the Am-241 and the Cm-244 are separated step by step by the constructed three-stage gradient extraction module, so that the effects of shortening the separation process and improving the isotope separation factor and selectivity are achieved.

The invention relates to the technical field of photoelectric materials, and discloses a divalent platinum complex, a preparation method and application thereof and an organic photoelectric device, the divalent platinum complex has a structure as shown in formula (I): R1-R12 are the same or different and are independently selected from one or more of a hydrogen atom, a hydrogen isotope atom, a halogen atom and a polyatomic substituent; the polyatomic substituent group comprises one or more of alkyl, aryl, naphthenic base, cycloalkenyl, heteroaryl, alkenyl, alkoxy, aryloxy, silyl and the substituent groups containing isotope atoms; the green light wavelength peak value of the bivalent platinum complex is within 500-540 nm, and the bivalent platinum complex is good in stability and high in efficiency; the light-emitting peak value of the prepared device is in the range of 500-540nm, and the CIE coordinate can better meet the requirements of panel display;

The application relates to an absolute temperature calculation method and system based on an isotopic absorption spectrum line, equipment and a medium, and belongs to the technical field of temperature measurement. The method comprises the following steps: acquiring absorption spectrum lines of gas A and gas B on the same light path under the same light path and a to-be-measured temperature, and characteristic parameters of the gas A and the gas B, wherein the gas A and the gas B are different isotopic gases of the same substance; and obtaining the absolute temperature of the to-be-measured temperature according to the absorption spectrum lines and the characteristic parameters of the gas A and the gas B under the to-be-measured temperature. The method principle discards the traditional electrical temperature measurement principle, directly calculates the absolute temperature of the to-be-measured temperature based on the light absorption intensity of the different isotopic gases of the same substance, and solves the problems in the background art.

A rare-earth-doped antiferromagnetic crystal is disclosed, designed to achieve long optical coherence times and enable coherent coupling between optical and magnon modes. The crystal includes a host lattice, such as gadolinium vanadate, gadolinium oxide, or gadolinium silicate, which is antiferromagnetic below a Néel temperature and is doped with a second rare-earth ion, such as erbium. By operating at cryogenic temperatures, electron spins in the host are magnetically ordered, providing a quiet magnetic environment that minimizes decoherence for the dopant ions. The system achieves long optical coherence times for the rare-earth dopant ions, supporting robust quantum memory and communication. Additionally, coherent coupling between the optical transitions of the dopant and magnon modes of the host enables efficient microwave-to-optical quantum transduction. Isotopic purification of the host and / or dopant ions can further reduce nuclear spin noise, enhancing coherence times.

A hydrogen extraction system for extracting hydrogen from a liquid electrolyte 102 comprising at least one isotopologue of lithium hydride (LiH), the system including an electrolysis cell 100 comprisi