36 results about "Internal radiation" patented technology

The invention relates to the technical field of infrared measurement, in particular to an intelligent calibration method and system for temperature measurement of an infrared sensor, and the method comprises the steps: enabling an infrared camera to align with a blackbody radiation source to form a calibration scene, collecting the output of a plurality of groups of pixels under different radiation temperatures and different internal part temperature states, fitting a temperature signal response model containing an exponential term and a bias term according to least square to obtain amplitude, exponential, temperature offset and output bias parameters; during measurement, a thermal image containing a target object and two reference blackbody sources is obtained, and parameters such as emissivity, environment equivalent radiation temperature, transmission medium and optical transmission, camera temperature and the like are synchronously obtained; performing non-uniformity and offset correction and abnormal pixel replacement on the thermal image; the initial temperature is inverted based on radiation transfer decomposition and compensation of internal radiation of the camera; and carrying out statistical averaging on the temperatures of the two blackbody reference regions to obtain a double-point correction coefficient, and outputting correction temperature or temperature distribution. According to the method, the problems that temperature inversion model parameters are difficult to adaptively update along with working conditions and on-site temperature measurement errors are difficult to effectively suppress when an existing infrared sensor array is in a long-distance non-contact temperature measurement scene can be solved.

A large-scale internal partition wall radiation internal circulation convective heat transfer square box electric heating furnace sequentially comprises a square box furnace steel structure, a square box furnace wall plate and a heat insulation lining from outside to inside. The whole shell is supported by the square box furnace steel structure, the square box furnace steel structure is connected with the square box furnace wall plate in a welded mode, and the heat insulation lining is arranged on the inner side of the wall plate and plays a role in heat insulation. The furnace tubes are horizontally arranged in an inner cavity of the square box furnace, a medium flows from top to bottom along each row of furnace tubes, certain spaces are reserved for the furnace tubes from top to bottom every three rows to insert the electric heating tubes, and the electric heating tubes and the furnace tubes are arranged at 90 degrees. The furnace tubes are arranged in multiple rows in the horizontal direction, and the distance between every two rows is 1.5 times or multiple times of the tube center distance. The square box type structure is adopted, the furnace tubes and the electric heating tubes are distributed in the square box type structure in a transversely and vertically staggered mode, and the space in the square box type furnace is utilized to the maximum extent. Gas in the furnace body cyclically and regularly flows between the two cavities, the airflow movement speed can be controlled by controlling the rotating speed of the frequency conversion fan, and the heat intensity of the surface of the furnace tube is greatly improved.

The invention relates to a method for intelligently detecting the service life of a furnace lining in a non-ferrous metal smelting process based on multi-modal deep learning, and the method comprises the steps: collecting multi-modal data during the operation of a non-ferrous metal smelting furnace, and carrying out the preprocessing of the multi-modal data; fusing the preprocessed data, and performing depth feature extraction and anomaly detection on the fused data; based on the extracted depth features and the anomaly detection result, multi-physics field inversion and temperature distribution reconstruction are carried out, and internal radiation heat exchange temperature and furnace lining inner wall temperature distribution are obtained; and according to the internal radiation heat exchange temperature and the temperature distribution of the inner wall of the furnace lining, furnace lining remaining service life prediction and health state evaluation are carried out. The invention aims to realize high-precision detection and life prediction of the furnace lining state by fusing various sensor data and an advanced deep learning algorithm, so that the production efficiency is improved, the maintenance cost is reduced, and the safety of the production process is enhanced.

The application provides GPC1 in preventing and / or treating 131 The application of inhaled internal radiation in causing thyroid cancer belongs to the technical field of biological medicine. The application takes GPC1 as 131 A treatment target of inhaled internal radiation in causing thyroid cancer, and finds that high expression of GPC1 can promote the proliferation, migration and invasion of thyroid cancer cells, and low GPC1 inhibits the occurrence and development of thyroid cancer. Therefore, the application provides application of a reagent for inhibiting, knocking down or knocking out GPC1 in preparation of a drug for preventing and / or treating thyroid cancer. The application also provides that deletion of GPC1 can effectively alleviate 131 The phenotypes of thyroid cancer caused by inhaled internal radiation, and GPC1 is an effective target for preventing and treating 131 Thyroid cancer caused by inhaled internal radiation.

The invention discloses a red light internal radiation rhinitis auxiliary phototherapy device, and relates to the technical field of rhinitis phototherapy, the device comprises a driving source and phototherapy emitters, the driving source is provided with two groups of single tube structures so as to be respectively guided into two nostrils of a patient, each group of single tube structure is internally provided with the phototherapy emitter, and each single tube structure comprises an emitter shell, a light source, a light source and a light source, an inner sleeve is arranged in the emitter shell, the phototherapy emitter can be installed in the inner sleeve, transverse partition plates are arranged on the two sides of the inner sleeve, and the interior of the emitter shell is divided into an air outlet bin and an air inlet bin which are distributed up and down through the transverse partition plates; the rubber expansion layer is fixedly mounted on the outer layer of the emitter shell; the phototherapy emitter is protected through the emitter shell, the phototherapy emitter is prevented from directly making contact with the nasal cavity of a patient, the rubber expansion layer contracts to assist the patient in breathing, an air inlet channel and an air outlet channel of the patient are distinguished, and the possibility that the phototherapy emitter is blocked by the nasal cavity mucus is reduced.

The invention discloses a preparation method of yttrium-90 (90Y)-loaded magnesium lithium silicate and a hydrogel radiotherapy embolism agent, relates to the technical field of medical materials, and comprises the preparation method of yttrium-90-loaded magnesium lithium silicate and the hydrogel radiotherapy embolism agent. Lithium magnesium silicate is modified and treated by phosphate, and citric acid is complexed with < 90 > Y < 3 + >, so that interlayer cations of the lithium magnesium silicate are replaced, and < 90 > Y < 3 + > is stably loaded on the lithium magnesium silicate to prepare the < 90 > Y-lithium magnesium silicate compound. Yttrium-90 is a therapeutic nuclide, and a 90Y-magnesium lithium silicate loaded compound can be added into an embolism agent as a thixotropic agent to prepare a hydrogel radiotherapy embolism agent, so that dual effects of internal radiation and vascular embolism are realized.

The invention discloses an alpine region sewage treatment mechanical stirring strengthening device which comprises a base, a stirring assembly and a heating assembly, the top of the base is connected with a stirring bin through supporting legs, the stirring assembly is arranged in the stirring bin, and the stirring assembly comprises a hollow stirring shaft and a gearbox. The two sets of hollow stirring shafts are rotationally connected into the stirring bin through bearing seats, the heating assembly comprises an electric heating plate and an electric heating rod, and efficient transfer and uniform diffusion of heat are achieved through the dual effects of bottom conduction and internal radiation of the stirring bin; an electric heating plate at the bottom of the stirring bin is matched with a high-thermal-conductivity pad to form a global basic heating layer, so that sewage at the bottom area of the stirring bin cannot be frozen due to low temperature; the internal electrical bars rotate along with the stirring shaft to form a dynamic heating field, and the temperature of sewage in the bin is uniformly distributed by combining the convection effect of reverse stirring, so that the temperature of the sewage is effectively maintained in the optimal activity interval of functional microorganisms such as nitrifying bacteria.

The intelligent waste radiation protection container for the nuclear medicine department comprises a lead barrel, first L-shaped fixing pieces are fixed to the outer walls of the two sides of the lead barrel respectively, and electric push rods are fixed to the outer walls of the tops of the first L-shaped fixing pieces. The radiation dosage in the lead barrel is monitored in real time through the NaI (T1) scintillator detector and the GM counting tube, and meanwhile, the real-time radiation dosage is displayed on the outer wall of the control panel, so that medical staff can know the real-time radiation dosage in the lead barrel without opening the lead barrel, meanwhile, a thick and heavy lead cover does not need to be lifted by themselves, and the working efficiency is improved. Garbage in the lead barrel can be conveniently taken out by a user, the labor intensity of medical staff is relieved, meanwhile, the weight and the volume, monitored by the distance measuring sensor and the weighing sensor, of the waste in the lead barrel can be transmitted to the control panel in real time, the control panel can display the volume and the weight data of the waste in the lead barrel on the screen, and therefore the waste can be conveniently taken out. And medical staff can clearly see the current waste storage amount in the lead barrel.

The application discloses a kind of symmetric split ring slot and L-shaped coupling branch combined hexagonal multi-frequency microstrip antenna, which can be applied to 5G mobile communication system;The antenna is composed of dielectric substrate, radiation patch and ground plate;Two split ring slot structures symmetric about the central axis of the patch are introduced in the upper half of the radiation patch, and two L-shaped coupling branches are added about the central axis of the feed line;The antenna uses embedded feed-in form, and the feed-in is inserted into the internal radiation patch;The antenna has simple structure, easy to process, resonant frequency is convenient to adjust, and has good passband matching characteristics;The application is designed to work in 28GHz, 37.5GHz, 44.5GHz and 50.5GHz frequency bands, and is suitable for 5G millimeter wave communication.

An energy storage system converts variable renewable electricity (VRE) to continuous heat at over 1000° C. Intermittent electrical energy heats a solid medium. Heat from the solid medium is delivered continuously on demand. An array of bricks incorporating internal radiation cavities is directly heated by thermal radiation. The cavities facilitate rapid, uniform heating via reradiation. Heat delivery via flowing gas establishes a thermocline which maintains high outlet temperature throughout discharge. Gas flows through structured pathways within the array, delivering heat which may be used for processes including calcination, hydrogen electrolysis, steam generation, and thermal power generation and cogeneration. Groups of thermal storage arrays may be controlled and operated at high temperatures without thermal runaway via deep-discharge sequencing. Forecast-based control enables continuous, year-round heat supply using current and advance information of weather and VRE availability. High-voltage DC power conversion and distribution circuitry improves the efficiency of VRE power transfer into the system.

The invention relates to the technical field of control cabinet systems, in particular to a control cabinet operation state intelligent monitoring and early warning system based on multi-source sensing. The data acquisition terminal is arranged in the control cabinet, the data acquisition terminal comprises a temperature sensor group, a vibration sensor and a smoke sensor, the temperature sensor group comprises a contact type sensor and a non-contact type sensor, the contact type sensor is attached to the inner surface of the control cabinet, and the non-contact type sensor is attached to the inner surface of the control cabinet. The non-contact sensor is arranged in the control cabinet to measure the radiation temperature in the control cabinet; the local processing unit is arranged outside the control cabinet, the local processing unit comprises an integrated panel, a microprocessor, a memory and a wired communication module, and the microprocessor, the memory and the wired communication module are all arranged in the integrated panel; the early warning unit is arranged at the upper end of the control cabinet, the early warning unit comprises an audible and visual alarm and a protective relay, and the audible and visual alarm and the protective relay are in signal connection with the microprocessor.

The invention relates to the technical field of electromagnetic energy enhancement and electromagnetic power synthesis, and the existing method is extremely sensitive to the position of a radiation point source in a material and the change of the sectional area of the material, and has high dependence on the numerical value of the relative dielectric constant E or the relative permeability mu of the material. The invention provides an electromagnetic energy enhancement structure based on a dielectric constant near-zero metamaterial, and the structure is characterized in that electromagnetic energy supply structures are located at the periphery of an electromagnetic energy collection region, and the electromagnetic energy collection region and all the electromagnetic energy supply structures are disposed in a metal boundary; energy radiated by the electromagnetic energy supply structures is transmitted to the electromagnetic energy collection area through the filling area to be received, linear superposition of electromagnetic energy in the electromagnetic energy collection area is achieved, the intensity of the output electromagnetic energy is regulated and controlled by adjusting the number of the electromagnetic energy supply structures, and nearly 100% energy transmission efficiency can be achieved.

The invention relates to coil-type photochemical reactors having an internal source of radiation and is intended for use in the field of processing optically dense fluids. The present coil-type photochemical reactor consists of a housing having an inlet opening and an outlet opening and containing a coiled tube and a source of radiation which is disposed inside the cavity formed by the turns of the coiled tube. The housing consists of two flanges with a casing disposed therebetween. Mounted inside the casing, along the surface thereof, are stud bolts, the ends of which are fastened in the flanges. The stud bolts are surrounded by seals. The coiled tube is disposed between the stud bolts. The inlet opening is situated in one of the flanges, and the outlet opening is situated in the other flange. The ends of the coiled tube pass through the openings. The source of radiation is fastened on the outside of the flanges by caps and by seals disposed in bushings. The technical result consists in increasing the efficiency of a coil-type photochemical reactor.

An air treatment unit (1) produced in the form of a cartridge (2) is provided, which is configured to be positioned on at least part of the air circulation path in ventilation equipment. This treatment unit (1) has an interior volume (21) which is associated with at least one input orifice (3) and at least one output orifice (4) positioned at the ends of an air circulation path. At least part of the interior surface of the volume (21) is equipped with at least one light-emission source (5) with a wavelength of between 100 nm and 400 nm, designed to radiate towards the interior of the volume of the unit (1) at one section at least of the air circulation path in the interior of the volume of the unit (1).

The present application relates to the technical field of in vivo radiation dose rate determination, and specifically to a method, system, and storage medium for determining in vivo radiation dose rate during nuclide therapy. The method comprises: measuring an energy spectrum of radiation emitted from a body during nuclide therapy for a preset duration; collecting ambient temperature and humidity at each moment within the preset duration; analyzing deviations of ambient temperature at all moments from a preset standard temperature range, and ambient humidity at all moments from a preset standard humidity range, and correcting the radiation energy spectrum data; determining the characteristic complexity of the corrected radiation energy spectrum; obtaining an optimized path width of the radiation energy spectrum; and using the optimized path width to obtain an optimized radiation energy spectrum and obtain the in vivo radiation dose rate during nuclide therapy. This improves the accuracy of determining the in vivo radiation dose rate during nuclide therapy.

The utility model relates to the technical field of atomization equipment, and provides a heating assembly and atomization equipment. The heating assembly comprises a heating pipe, the heating pipe is of a light-transmitting structure, and an insertion opening is formed in one end, in the first direction, of a containing cavity in the heating pipe; a plurality of supporting layers are arranged on the outer side wall of the heating pipe at intervals in the first direction, and each supporting layer comprises a plurality of supporting structures arranged at intervals in the circumferential direction; and the heating piece is wound on the circumferential outer side of the heating pipe, is borne on the supporting structures of the multiple supporting layers and is used for heating the aerosol generating rod in the containing cavity. According to the technical scheme, the heating piece can radiate infrared rays to the interior of the heating tube, so that the aerosol generating rod contained in the heating tube is heated more uniformly, the local over-baking phenomenon can be prevented, the structure is simple, a thick-film resistor does not need to be printed, the phenomena of deformation, collapse, displacement and the like caused when the heating piece is installed in the vacuum cavity can be avoided, and the service life of the aerosol generating rod is prolonged. And the processing and manufacturing difficulty can be effectively reduced, and the manufacturing cost can be reduced.

The invention discloses a high-temperature molten salt thermophysical property parameter inversion method based on a high-low power laser heating strategy, solves the problem that an existing method cannot realize accurate decoupling measurement of heat conductivity coefficient, specific heat capacity and radiation physical property parameters of high-temperature semitransparent molten salt, and belongs to the technical field of high-temperature thermophysical property measurement. The method comprises the following steps: constructing a fused salt laser heating experiment system and a two-dimensional axisymmetric radiation heat conduction coupling heat transfer physical model; analyzing and screening an optimal parameter inversion time window by using a Fisher information matrix; low-power laser is used for generating tiny temperature rise, the radiation heat exchange weight is extremely low, and heat conduction parameters are inversed in the first step through the built system and model; then, high-power laser is utilized to generate great temperature rise so as to excite a remarkable medium internal radiation effect and physical property nonlinear change, and an obtained heat conduction parameter serves as a known quantity to analyze a radiation parameter sensitive to high temperature and a nonlinear coefficient of the physical property changing along with the temperature;

A radiating device (1, 1bis) configured to be placed with respect to a jar (2) at a distance between 0.01 mm and 50 cm and comprising a plurality of LED light sources of the RGB, UV, IR type, placed inside recesses (1a), said radiant device (1, 1bis) being placed in a removable manner inside a mill (7) to allow the irradiation of the jar (2) by the LED light source.

Container (120) for heating an object (130), comprising: an upper surface (121), a lower surface (122), a plurality of side surfaces (123-126), wherein the upper surface (121), the lower surface (122) and the plurality of side surfaces (123-126) define an interior of the container in which the object (130) is placed, a heating jacket (110) which is connected to a first of the side surfaces (123), wherein the heating jacket (110) is designed to radiate heat into the interior of the container (120), a frame (210) with a multitude of shelves (211, 212, 213) that define separately controllable temperature zones (T1-T4), and a temperature control module (140) designed to control the amount of heat radiated by the heating jacket (110), wherein the temperature control module (140) generates a pulse width modulated waveform, wherein a duty cycle of the pulse width modulated waveform independently controls the amount of heat radiated by the heating jacket (110) for the separately controllable temperature zones (T1-T4).

The application belongs to the technical field of medical devices, and provides a nasal cavity decontamination device for otolaryngology, which comprises a liquid distribution assembly, a nasal washing tube, a liquid spraying channel, a cleaning brush and a driving mechanism. The hair is washed before formal decontamination of the nasal cavity, so that radioactive fallout, radioactive or chemical toxic dust, etc. entering the nasal cavity can be thoroughly and finely washed and removed from the hair, reducing the risk of internal radiation and reducing chemical toxic residue. At the same time, when the nasal cavity is formally decontaminated later, the hair can effectively prevent radioactive particles, radioactive dust, chemical toxic particles, etc. from blocking the posterior naris when the nasal cavity is directly decontaminated, avoiding affecting the entry of the cleaning waste liquid into the other nasal cavity and the discharge, thereby improving the decontamination efficiency, and avoiding discomfort for the user during decontamination, avoiding secondary pollution, aspiration and even suffocation.

The invention discloses a method for simultaneously measuring the heat conductivity coefficient and the surface heat flux density of a solid-liquid phase change material. The method comprises the following steps: S1, setting control parameters of a grey wolf optimization algorithm; s2, randomly initializing the position of each grey wolf individual; s3, establishing an internal radiation heat conduction coupling heat exchange model of the solid-liquid phase change material; s4, the surface of the solid-liquid phase change material is heated, and the temperature is measured; s5, solving the coupling heat exchange model; s6, establishing an input signal and a grey wolf individual fitness function which are measured at the same time; step S7, constructing a hybrid optimization module for simultaneous measurement; step S8, updating according to an optimization result; s9, checking whether an iteration stop condition is reached or not; and S10, outputting as a measurement result, and ending the measurement. A computer program for executing the method is stored in the storage medium. The method has the advantages of being simple in principle, easy to implement, high in measurement precision and measurement efficiency and the like.

The utility model discloses a shielding mechanism of a shielding machine room, which relates to the technical field of shielding mechanisms and comprises a shielding machine room outer shell, a second clamping groove block and a first clamping groove block are fixedly connected to the front end and the rear end of the inner wall of the shielding machine room outer shell respectively, and a second vertical plate is clamped to the rear end of the second clamping groove block. The front end of the first clamping groove block is connected with a first vertical plate in a clamped mode, and a connecting plate is arranged between the first vertical plate and the first clamping groove block, the shielding mechanism of the shielding machine room can effectively resist the influence of equipment operation vibration and personnel activity, guarantee the stability of connection of all parts, maintain the good shielding performance of the shielding machine room, and improve the shielding performance of the shielding machine room. According to the invention, external electromagnetic signal invasion and internal radiation leakage are prevented, mutual interference caused by radiation between devices can be effectively avoided, the stability and reliability of operation of the devices in a machine room are greatly improved, and the accuracy of research and development, testing and experimental results of electronic devices is guaranteed.

An energy storage system converts variable renewable electricity (VRE) to continuous heat at over 1000° C. Intermittent electrical energy heats a solid medium. Heat from the solid medium is delivered continuously on demand. An array of bricks incorporating internal radiation cavities is directly heated by thermal radiation. The cavities facilitate rapid, uniform heating via reradiation. Heat delivery via flowing gas establishes a thermocline which maintains high outlet temperature throughout discharge. Gas flows through structured pathways within the array, delivering heat which may be used for processes including calcination, hydrogen electrolysis, steam generation, and thermal power generation and cogeneration. Groups of thermal storage arrays may be controlled and operated at high temperatures without thermal runaway via deep-discharge sequencing. Forecast-based control enables continuous, year-round heat supply using current and advance information of weather and VRE availability. High-voltage DC power conversion and distribution circuitry improves the efficiency of VRE power transfer into the system.

The invention discloses a complementary antenna, and relates to the technical field of antennas, and the complementary antenna comprises an electric dipole, a magnetic dipole, and a feed module. The electric dipole comprises a first radiation patch, the first radiation patch is provided with a through opening, an internal radiation area is divided on the first radiation patch through the through opening, and the outer contour of the internal radiation area is the same as the outer contour of the electric dipole. When the working frequency of the complementary antenna is in a first frequency band, energy is integrally radiated through the electric dipole, and when the working frequency of the complementary antenna is in a second frequency band, energy is radiated through the internal radiation area; the magnetic dipole comprises a second radiation patch, the second radiation patch is connected with the first radiation patch through a first through hole to feed the electric dipole, and the electric dipole and the magnetic dipole have the same phase; the feed module is used for feeding the magnetic dipole, and the magnetic dipole is arranged between the electric dipole and the feed module. The invention aims to further improve the bandwidth of the antenna applied to the aircraft.

A method of detecting radiation from a target object is described that utilizes a radiation detector module that includes a collimator having a plurality of apertures having a divergence angle for emitting the radiation. The method utilizes this by associating a target object with an internal radiation source such that radiation emitted from the target object passes through a collimator to be incident on a detector; receiving a plurality of responses, each response being a response to an interaction with the incident radiation occurring within the detector; determining, for each of the plurality of responses, a location of each interaction within the probe in a three-dimensional space, the three-dimensional space comprising two area dimensions and one depth dimension; the plurality of responses are processed by simultaneously processing the location data in such a manner that information about a portion of the target object within an effective field of view that is not directly consistent with the main field of view is obtained.

The application relates to the technical field of refrigeration equipment, and particularly discloses a vector magnet system. The system comprises a vacuum shell with an upward opening, a dilution refrigerator and a radiation structure; the dilution refrigerator comprises a refrigerator cover and a plurality of cold plates arranged below the refrigerator cover, and one cold plate except the lowermost cold plate is defined as a matching cold plate; the radiation structure is the same in number as the cold plates and corresponds to the cold plates one by one, the radiation structure is fixed to the bottom end of the corresponding cold plate and surrounds a radiation cavity, a high-temperature radiation cavity is sleeved outside a low-temperature radiation cavity, and experimental equipment is accommodated in the innermost radiation cavity; the radiation structure corresponding to the matching cold plate comprises a vector magnet module, four tubular circumferential magnets are uniformly distributed in the circumferential direction of a tubular main magnet of the vector magnet module, the tubular circumferential magnets extend along the radial direction of the tubular main magnet, the experimental equipment is arranged in the tubular main magnet, and the bottom of the matching cold plate is in thermal connection with the top of the tubular main magnet through a tubular radiation screen. The system is used for providing an extremely low-temperature environment and a vector magnetic field.

To provide a grill excellent in cleaning property of a heating chamber.SOLUTION: A grill 2 comprises: a heating chamber 20; a door 21; upper heating means 22 for heating a top surface of a heated object; a pair of lower heating means 23 each of which is arranged on outside of one / the other of a pair of side wall parts 203, and has an infrared radiation radiating part 230 for radiating an infrared radiation into the heating chamber 20 from outside of each side wall part 203 and heating the lower surface or side surface of the heated object; and an exhaust duct 30 for exhausting an exhaust gas in the heating chamber 20 to outside of the heating chamber 20 from an exhaust hole 301. Each side wall part 203 has a side opening 24 on a region facing the infrared radiation radiating part 230 of the lower heating means 23, and the side opening 24 is covered with a side transmission part 26 through which the infrared radiation radiated from the infrared radiation radiating part 230 of the lower heating means 23 is transmitted.SELECTED DRAWING: Figure 4

The application provides a radiation monitoring method and system based on data processing. The method comprises the following steps: obtaining radiation detection values of each radiation detection sensor in an internal radiation detection sensor sequence to form an internal radiation detection value sequence, and obtaining radiation detection values of each radiation detection sensor in an external radiation detection sensor sequence to form an external radiation detection value sequence; then, determining an external radiation reference value sequence according to the internal radiation detection value sequence and a preset radiation attenuation model; and determining a radiation safety level of a space to be monitored according to the external radiation reference value sequence and the external radiation detection value sequence, and monitoring the radiation protection performance of the space to be monitored to ensure the protection reliability of the space to be monitored.

The invention relates to a combined analysis method of 3H, 90Sr and 241Am in a urine sample, which comprises the following steps: measuring the activity of 90Y in the urine sample, adding a stable Sr standard solution and 243Am into the urine sample as tracers, passing the urine sample through a cationic resin column and an anionic resin column which are connected in series from top to bottom, washing with ultrapure water, and measuring the activity of 3H in the urine sample; eluting the cation resin column, the anion resin column, the Sr resin column and the DGA resin column which are connected in series from top to bottom by using nitric acid, and recording the separation time of 90Sr / 90Y; and eluting the Sr resin column with ultrapure water, mixing the 90Sr eluent with the scintillation liquid, measuring by using a liquid scintillation counter, and calculating to obtain the activity of 90Sr in the urine sample. And eluting the DGA resin column by using an eluent, and measuring the activity of 241Am in the urine sample, so that 3H, 90Sr and 241Am in the urine sample can be accurately and efficiently combined and analyzed. The content of radionuclides 3H, 90Sr and 241Am in urine can be efficiently obtained, the analysis process is shortened, manpower and material resources are saved, and an effective basis is provided for medical evaluation or internal irradiation evaluation.