40 results about "Radiation leakage" patented technology

The invention relates to a reconfigurable dual-mode leaky-wave antenna with global scanning capability and a reconfiguration method, the leaky-wave antenna comprises a double-layer slow-wave waveguide structure formed by an upper metal conductor and a lower metal conductor, and the upper metal conductor and the lower metal conductor are separated by a dielectric substrate; the double-layer slow-wave waveguide structure comprises a plurality of periodic units, and a plurality of T-shaped structures with opposite directions are processed on upper and lower layers of metal conductors of each periodic unit to form a plurality of grooves; a variable capacitance diode is embedded into the tail end of a slot arm of the upper-layer metal conductor and is electrically connected with the lower-layer metal conductor through a metal via hole, and a closed loop is formed between the upper-layer metal conductor and the lower-layer metal conductor; a plurality of elliptical radiation patches are arranged at the top of a slot arm of the lower metal conductor at intervals and used for radiation leakage of the slow wave waveguide, and continuous frequency scanning covering 180 degrees is achieved; according to the invention, two modes of frequency scanning and fixed-frequency scanning are fused, 180-degree global scanning can be realized in any frequency reconfigurable interval, and beams can be flexibly reconstructed through multiple control strategies under a fixed-frequency condition.

The invention provides a crystal growth device and a crystal growth method, and solves the technical problems of low wafer utilization rate, low crystal growth speed, low efficiency, poor uniformity and the like in the existing chip manufacturing process. According to the invention, a traditional cylindrical ampoule structure is abandoned, and the annular ampoule design is innovatively adopted, so that the crystal grows into an inner hollow cylinder shape which is highly matched with the specification of a target wafer; the heater is arranged on the inner side of the ampoule, a traditional outer side heating mode is replaced, and heat is intensively acted on crystals in cooperation with an adjusting center of a heat preservation material during crystal growth, so that heat loss is reduced; the periphery of the heater is made of heat insulation materials, heat radiation leakage is effectively restrained, meanwhile, the ampoule supporting structure is adjusted, and the whole device is simple, low in cost and light in weight.

The invention relates to the technical field of cooling of particle accelerators and nuclear power equipment, and discloses a cooling device suitable for high-power rays, which comprises an absorber assembly, a cooling water system assembly, a vacuum tube assembly, a shield assembly and a support assembly. The absorber assembly is formed by welding internal graphite and external copper through a brazing process, and air holes penetrating to a graphite layer are formed in the copper and communicated with an air cavity in the graphite to form a vacuum sealing cavity. The cooling water system assembly comprises a water segregator with two layers of water inlet ring cavities and two layers of water outlet ring cavities, and uniform flow distribution is ensured. And the absorber cooling water pipe is embedded into the copper and is connected with the U-shaped pipe to form a cooling loop. The electron beam bombards the graphite to generate heat, and the heat is transferred to the copper and taken away by cooling water in the cooling water pipe embedded in the copper. The shield assembly is arranged around the vacuum tube assembly to prevent radiation leakage. The cooling device realizes effective heat dissipation of 8GeV high-power rays, and has excellent radiation resistance and extremely long fatigue life.

The invention discloses an improved radioactive liquid medicine automatic split charging instrument, and belongs to the field of medical instruments. The split charging instrument comprises a split charging injector, a protective back plate and a driving mechanism, the driving mechanism comprises a driving motor, a motor shaft, a driving screw rod, a sliding block arranged on the driving screw rod and a plunger pushing claw connected with the sliding block, the driving motor is fixed to the outer side of the protective back plate, and the driving screw rod is rotatably fixed to the inner side of the protective back plate. A first through hole for a motor shaft to penetrate through is formed in the protective back plate, the outer end of the motor shaft is connected with an output shaft of the driving motor, the inner end of the motor shaft is connected with a first bevel gear, and the upper end of the driving screw is connected with a second bevel gear meshed with the first bevel gear. The driving screw rotates under the action of the driving motor, and the sliding block drives the plunger push pawl to move up and down along with rotation of the driving screw, so that up-and-down insertion and extraction of an injector are realized. The radioactive medicine liquid automatic split charging instrument is simple in structure, ingenious in design and low in cost, radioactive ray leakage can be effectively avoided, and the safety of the radioactive medicine liquid automatic split charging instrument is greatly improved.

The invention relates to the technical field of radioactive equipment processing, and provides cutting equipment and a cutting radioactive container, and the cutting equipment comprises a cutting base, a lifting device, a clamping device, a rotating device and a cutting device. The cutting base is arranged on the shielding facility, and a cutting opening communicated with a well mouth of the shielding facility is formed in the cutting base; the lifting device is arranged on the cutting base, and the lifting device is configured to be capable of driving the radioactive container to stretch out of the cutting opening in a segmented mode; the clamping device is arranged on the cutting base and used for clamping and releasing the radioactive container; the rotating device is arranged on the cutting base and used for driving the radioactive container to rotate around the axis of the radioactive container. The cutting device is arranged on the cutting base and used for cutting the extending part of the radioactive container. According to the cutting equipment, the risk of radiation leakage can be reduced.

This invention relates to the field of radiation leakage detection technology, and discloses a radiation leakage detection method and apparatus based on a target sensor. The method includes: determining the current state of a radiation device, and acquiring a first set of radiation data of the radiation device in the current state based on the target sensor corresponding to the radiation device and according to the acquisition mode corresponding to the current state; determining whether the radiation device has experienced radiation leakage based on the first set of radiation data and a preset radiation threshold; when radiation leakage occurs, determining the radiation leakage level, and triggering a radiation leakage alarm based on the radiation leakage level. Therefore, this invention can achieve real-time leakage monitoring of radiation devices, adapt to the detection needs of different working states, accurately identify radiation leakage risks and quickly trigger alarm measures, effectively improve the active safety protection capability of radiation devices, and promptly ensure the radiation safety of operators and surrounding personnel, thereby improving the safety and stability of radiation device use.

The application relates to a radiation-proof building structure containing settlement joints and a construction method thereof, and relates to the technical field of radiation-proof building construction. The radiation-proof building structure containing settlement joints comprises two support plates, a plurality of outer wall bodies located between the two support plates, and all the outer wall bodies are sequentially arranged in a head-tail connection mode along the circumferential direction of the support plates. The outer wall bodies are connected with each support plate. The outer wall bodies are provided with wall surface settlement joints, the support plates are provided with ground surface settlement joints, the ground surface settlement joints and the wall surface settlement joints are connected with each other, the upper surfaces of the support plates are provided with ground surface radiation-proof layers and ground surface radiation-proof expansion devices covering the ground surface settlement joints, and the surfaces of the outer wall bodies are provided with wall surface radiation-proof layers and wall surface radiation-proof expansion devices covering the wall surface settlement joints. The wall surface radiation-proof expansion devices can automatically expand and contract to cover the wall surface settlement joints at all times, the ground surface radiation-proof expansion devices can automatically expand and contract to cover the ground surface settlement joints at all times, and therefore the possibility of radiation leakage to the outside is reduced.

This invention discloses a shielding processing device and method for electron beam curing of workpieces, comprising a shell, a driving device, a moving shielding assembly, a gas filling device, and an electron beam radiation device. The shell has a first cavity and is provided with an inlet and an outlet communicating with the first cavity. The shell is also movably provided with an inlet gate and an outlet gate. The driving device is located in the shell. The moving shielding assembly includes a turntable and at least two gas baffles. The upper end of the turntable is divided into at least two conveying stations by the gas baffles. Each conveying station can independently connect to the outlet or the inlet as the turntable rotates. The gas filling device is located in the shell and is used to fill the conveying stations with protective gas. The electron beam radiation device is located in the shell and is used to output an electron beam to the conveying station that has been filled with protective gas. The above structure is compact and occupies little space. The gas baffles can not only prevent the protective gas from escaping, saving protective gas, but also prevent radiation leakage.

The application discloses an X-ray irradiation blue synthesis zirconia color change rapid recovery test method, which comprises the following steps: step one, preparing powder according to the mole percentage; step two, adopting a cold crucible floating zone method to synthesize blue zirconia; step three, performing X-ray irradiation on the blue synthesized zirconia crystal to make the blue synthesized zirconia crystal change color; step four, heat treatment; step five, ultraviolet light irradiation; step six, photographing and comparing the synthesized zirconia after irradiation, heat treatment and ultraviolet light irradiation, and determining the chroma of the synthesized zirconia by using a fiber spectrometer to seek the optimal heat treatment and light irradiation parameters for recovering the color to the original chroma before irradiation. Through the rapid recovery test of the irradiation color change of the synthesized zirconia, the new material which can be recycled multiple times and takes into account the economic and environmental benefits is sought, a new selection is provided for the radiation leakage indication lamp material, and the X-ray radiation leakage indication lamp is easier to popularize and apply to the market.

This invention relates to the field of radiation early warning technology, specifically to an early warning system for the radiation impact on the environment surrounding a proton therapy system. The system includes a radiation monitoring data acquisition module, a radiation spatial distribution generation module, a radiation risk level determination module, a radiation leakage analysis module, a dynamic risk information notification module, and a treatment optimization suggestion module. In this invention, by real-time monitoring and data integration of the radiation monitoring environment, the response speed and accuracy of radiation safety early warning are improved. By utilizing spatial data and radiation intensity information, a detailed radiation distribution map can be constructed, making risk assessment more intuitive and easier to understand. Accurate assessment of radiation risk allows for specific and targeted protective measures, and potential leakage points are classified according to radiation level deviations. Dynamic notification of risk information ensures that treatment personnel receive critical safety alerts in a timely manner, optimizing the treatment process and reducing the radiation risk to patients.

The utility model belongs to the technical field of ray protection doors, and particularly relates to a hidden protection device which comprises a shell, an elastic connecting part, an adhesive tape, an aluminum profile and a lead plate. The shell is arranged in a groove body in the bottom of the door leaf, a preformed hole is formed in the side wall of the door leaf and communicates with the groove body, and an elastic column on the elastic connecting part is arranged in the preformed hole; an elastic connecting part is arranged in the shell, an aluminum profile is connected to the lower portion of the elastic connecting part, a lead plate is arranged in the aluminum profile, a rubber strip is arranged outside the aluminum profile, the elastic connecting part is connected with the shell, and the shell is connected with a door leaf. According to the device, the lead plate is matched with the aluminum profile and the adhesive tape, so that rays can be blocked and shielded, radiation leakage is avoided, and the safety guarantee for a human body is improved.

The application discloses a marine bottom shielding structure combining a cabin bottom shielding structure and a stack bottom shielding structure, which comprises the cabin bottom shielding structure and the stack bottom shielding structure located on the lower plate of the double bottom of a ship body, and a stack cabin shielding structure and a primary shielding structure located on the upper plate of the double bottom of the ship body, wherein the primary shielding structure is wrapped outside a reactor pressure vessel, the stack cabin shielding structure is located outside the primary shielding structure, the cabin bottom shielding structure is located outside the stack bottom shielding structure, and the stack bottom shielding structure is located below the primary shielding structure. The marine bottom shielding structure combining the cabin bottom shielding structure and the stack bottom shielding structure has simple structure, can form a complete radiation shielding system together with the stack cabin shielding structure, the primary shielding structure and seawater below the ship body, and can weaken the radiation leakage of the stack cabin to the surrounding area to the maximum extent, so as to ensure the radiation safety of personnel and equipment in the surrounding area.

The utility model relates to the technical field of building equipment, in particular to an electric door, which comprises a driving mechanism and a door leaf mechanism which are arranged on a wall surface, the driving mechanism comprises a driving assembly and a guide rail assembly; the door leaf mechanism comprises a door leaf body connected with the driving assembly and the guide rail assembly. The guide rail assembly guides the door leaf body to deviate towards the ground and the wall face in the closing process of the door leaf body, so that the door leaf body is tightly attached to the ground and the wall face. Air circulation can be reduced as much as possible, and the problem of insufficient sealing caused by gaps is avoided; according to the scheme, the door leaf body is guided to deviate towards the ground and the wall surface through the guide rail assembly, gaps between the door leaf body and the ground and the wall surface are reduced, air circulation is effectively avoided, and therefore the sealing effect is remarkably improved; the scheme is suitable for places such as laboratories, operating rooms or CT (Computed Tomography) detection rooms with higher requirements on sealing performance, and the problems of air pollution, radiation leakage and the like can be prevented.

Effective radioactive waste management will be implemented to ensure that radiation levels do not harm the environment or all forms of living organisms. [Solution] An apparatus and method positioned in close proximity to a radiation source to receive radiation from a radioactive material and configured to return the received radiation back to the source comprises at least one reflective means that partially reflects radiation, thereby effectively reducing the leakage of radiation emitted from the radiation source.

The present application provides a neutron capture therapy system, which can reduce or avoid the radiation damage and radiation leakage caused by the neutron and other radiation generated by the neutron capture therapy system to the treatment table positioning device. The neutron capture therapy system of the present application comprises a charged particle beam generating unit, a beam transmission unit, a neutron beam generating unit, a treatment table and a treatment table positioning device. The treatment table positioning device comprises a linear shaft and a mechanical arm. The mechanical arm is arranged between the linear shaft and the treatment table for supporting and positioning the treatment table. The linear shaft comprises a slide rail fixed to the building and a support connected with the mechanical arm. The support drives the treatment table and the mechanical arm to slide along the slide rail. The neutron capture therapy system further comprises a shielding device of the treatment table positioning device. The shielding device comprises a slide rail cover.

This utility model relates to the technical field of welding flaw detection equipment, and discloses a radiographic flaw detection chamber for weld inspection, including a flaw detection room. A push door is slidably connected to the outer side of the flaw detection room, and multiple connecting rods are rotatably connected to the outer side of the push door. A movable groove is formed on the outer side of the flaw detection room, and an internal groove is formed inside the push door. A baffle is slidably connected to the inner wall of the internal groove. A pull rod is fixedly connected to one side of the baffle, and a limit rod is fixedly connected to the other side of the baffle. A spring is sleeved on the outer side of the limit rod. In this utility model, by pulling the handle, the push door fits against the inner wall of the movable groove. The engagement of the locking block and the locking groove further improves the stability of the push door, preventing it from disengaging from the movable groove during inspection. With the cooperation of the sealing strip and the sealing groove, gaps are further reduced, preventing radiation leakage from affecting the use of other electronic equipment and protecting equipment and property safety.

The utility model relates to the technical field of manufacturing industry, in particular to an automatic door opening and closing structure for an ultra-large-breadth laser cutting machine, which comprises a cutting machine movably mounted on a cutting table, and a door opening and closing mechanism for preventing laser radiation leakage is arranged on the cutting machine. According to the laser cutting machine, the door opening and closing mechanism is arranged, in the cutting process, automatic opening and closing of the door can be achieved, manual operation is omitted, the automation level of equipment is improved, the time needed for opening and closing the door is shortened through the mechanism, the production efficiency is improved, and in the laser cutting process of a workpiece through the door opening and closing mechanism, the production efficiency is improved. By arranging the electromagnetic lock structure, the misoperation risk caused by manual operation can be reduced, the safety of equipment is improved, collision and noise between doors are reduced, laser radiation leakage can be prevented, the protection performance is improved, and the safety of operators is guaranteed.

The invention relates to a steel plate concrete shielding workshop and reinforced concrete wall arrangement and connection node, and relates to the technical field of concrete shielding workshops, the steel plate concrete shielding workshop and reinforced concrete wall arrangement and connection node comprises a steel plate concrete assembly, a reinforced concrete wall assembly and a composite connection assembly, the steel plate concrete assembly is fixedly arranged on the outer side surface of the reinforced concrete wall assembly; the steel plate concrete assembly comprises an outer-layer steel plate and inner-layer radiation shielding concrete. The radiation shielding performance is excellent, 15%-20% of barite aggregate and borax are doped into the inner-layer radiation shielding concrete, the barite aggregate can effectively block penetration of gamma rays and the like, the borax can specifically absorb neutron radiation, a dual-radiation protection barrier is formed, and the core requirement of a shielding plant for radiation isolation is met. In the composite connecting assembly, the radiation shielding plug filled in the shear-resistant sleeve is tightly attached to the steel plate concrete assembly and the reinforced concrete wall assembly, and a radiation leakage gap at a connecting node can be filled.

The present invention relates to the technical field of microwave radio frequency test. Disclosed are a tip structure for suppressing radiation, a two-dimensional probe and a probe structure. For the problems in millimeter-wave to terahertz on-chip testing of serious high-frequency radiation leakage, difficulty in continuous matching between impedance and broadband, mutual interference between a direct-current bias path and a radio frequency channel, poor balance of differential measurement, and the like, a cantilever shielding layer is introduced into a tip structure to construct a quasi-TEM transmission environment, thereby suppressing high-frequency radiation at source; a rectangular micro-coaxial structure, a rectangular waveguide-to-circular coaxial conversion structure, and an integrated direct-current bias network that are realized in light of additive manufacturing improve impedance continuity and structural consistency in a high-frequency band; and on this basis, a dual-band two-dimensional probe integrated with a duplexer, a differential two-dimensional probe suitable for differential measurement and a closed probe are further provided, so that a test system realizes single-ended and differential on-chip testing having high isolation, high repeatability and high precision in an ultra-wide frequency range.

This invention provides a crystal growth apparatus and method, solving technical problems such as low wafer utilization, slow crystal growth speed, low efficiency, and poor uniformity in existing chip manufacturing processes. This invention abandons the traditional cylindrical ampoule structure and innovatively adopts a ring-shaped ampoule design, allowing the crystal to grow into a hollow cylindrical shape highly adapted to the target wafer specifications. The heater is placed inside the ampoule, replacing the traditional external heating method. During crystal growth, a central adjustment mechanism with insulating material concentrates heat on the crystal, reducing heat loss. The heater is surrounded by insulating material, effectively suppressing heat radiation leakage. Simultaneously, the structure supporting the ampoule is adjusted, making the entire device simple, low-cost, and lightweight.

The utility model discloses a nuclear medicine special isolation barrier, wherein, nuclear medicine special isolation barrier through adopting isolation barrier board, the bottom of isolation barrier board is set apart to the multiple support frame of support structure, and the support frame extends to the board surface of the side far away from isolation barrier board, a moving piece is connected to the one end of a support frame far away from isolation barrier board, the lower surface of support frame and the lower surface of isolation barrier board are coplanar arrangement, and the moving piece has moving position and placement position relative to support frame, when being in moving position, the moving piece abuts to support plane, and the moving piece can roll relative to support plane, when being in placement position, the support frame can be pasted to support plane. The whole structure of the nuclear medicine special isolation barrier of the present application is clear and simple, avoids radiation leakage, makes its placement more stable at the same time, is convenient for clinical medical staff practical, and improves medical work efficiency.

The invention discloses a radiation protection circuit and semiconductor equipment, relates to the technical field of semiconductor processing, and aims to solve the problem that the real-time performance of radiation protection is affected due to the fact that delay exists when a PLC detects the state of a sensor to control whether a protection action is executed or not traditionally. According to the radiation protection circuit provided by the invention, the switch module is triggered to execute the protection action through the hard trigger circuit when the state sensing module detects that a potential radiation risk exists outside the semiconductor equipment, so that radiation leakage is avoided. Wherein the hard trigger circuit is implemented purely by hardware, and the control logic of the hard trigger circuit generates specific output in response to specific input. Compared with a traditional software detection scheme achieved through a PLC and a software program, the control logic has the advantages that a large number of intermediate links are omitted, and the response speed is greatly increased. And even if the response speed of the radiation protection action is higher, the timeliness is higher, and a better radiation protection effect is brought.

The utility model discloses a novel shielding door with an anti-radiation function, which comprises a combined door frame, and the combined door frame comprises an outer frame body, an inner frame body and a door opening cladding plate inserted between the outer frame body and the inner frame body; the door body is rotatably installed on the outer wall of the outer frame body, the door body comprises a core body, an outer shielding plate and an inner shielding plate, and metal shielding strips and a sealing ring are installed on the periphery of the outer wall of the outer shielding plate. And air flow and rays with a radiation function can be sealed and intercepted, so that indoor and outdoor radiation leakage is avoided, and the use safety of equipment is improved.

The ventilation device with the radioactive source shielding effect comprises a shielding wall and a ventilation pipeline arranged inside and outside the shielding wall in a penetrating mode, and an anti-radiation air window is installed on the surface of one end, located inside the shielding wall, of the ventilation pipeline. An anti-radiation connecting assembly is arranged at the joint of the ventilation pipeline and the shielding wall, the anti-radiation connecting assembly makes contact with the surface of the ventilation pipeline and the outer side surface of the ventilation pipeline at the same time, and the anti-radiation connecting assembly is arranged at the joint of the anti-radiation transom window and the ventilation pipeline. The anti-radiation connecting assembly makes contact with the outer side surface of the ventilation pipeline and the surface of the anti-radiation transom window at the same time. Under the anti-radiation support of the anti-radiation transom window, air flowing out of a room is filtered, radiation-containing factors are isolated on the outer side and prevented from moving towards the interior of the ventilation pipeline on one side, and under the curved guide of the ventilation pipeline, radiation is prevented from moving towards the interior of the ventilation pipeline, and the situation of radiation leakage is avoided.

The application discloses a variable cross-section shielding device, comprising: a shielding device body, the shielding device body is installed in a through hole, used for shielding ionizing radiation, the shielding device body extends along the axial direction of the through hole, the diameter of the shielding device body decreases along the axial direction of the through hole, so that the vertical cross section of the shielding device body is conical, the smaller end of the cross section of the shielding device body is used for inserting into the through hole, the shielding device body is composed of one or more shielding units, the shielding unit comprises a central shaft and a spiral blade, the central shaft extends along the axial direction of the through hole, the spiral blade is arranged on the central shaft, the outer edge of the spiral blade abuts against the inner wall of the through hole, and the spiral blade is used for scattering, slowing down and absorbing the rays, so as to reduce the radiation intensity and the ray energy. Therefore, the variable cross-section shielding device can effectively shield ionizing radiation and radiation leakage and avoid potential radiation risks. The application further discloses a nuclear facility shielding system.

The utility model discloses a waste heat boiler module detection structure, which belongs to the technical field of waste heat boilers and comprises a lead room main body, a door plate is mounted on the front side of the lead room main body, lead screens are symmetrically arranged on the outer side of the lead room main body, and a soft rubber lead curtain is arranged on the inner side of the lead room main body. And a lead baffle capable of being assembled and a scanning device are arranged in the lead room main body. According to the utility model, through the combined design of the lead room main body, the lead screen, the soft rubber lead curtain and the lead baffle plate capable of being assembled, the ray irradiation range is effectively limited, and the folding structure of the lead room main body and the flexible diverging design of the lead curtain are tightly attached to multiple layers of gaps of the boiler, so that the radiation leakage is controlled within a safe range; the modularized lead baffles are flexibly assembled through the self-locking universal wheels, protection dead corners of a detection area are filled, the design enables ray operation to be free of site cleaning, safe detection can be achieved in the daytime, and the efficiency bottleneck that production needs to be interrupted and operation needs to be conducted at night in traditional detection is thoroughly solved.

This invention discloses a Monte Carlo simulation method and system for iodine-131 drug treatment of thyroid tumors. The method includes: constructing a three-dimensional geometric model simulating radiation transport in a Monte Carlo simulation platform, including a first region model simulating neck soft tissue, a second region model embedded within this model simulating lesions, and a third region model assessing the impact of the radiation environment; configuring the physical processes simulating iodine-131 decay and particle-matter interactions based on the geometric model; defining a particle emission source based on iodine-131 decay data within the second region model; executing the simulation to obtain first energy deposition data for assessing tumor absorbed dose and second energy deposition data for assessing radiation leakage. Compared with existing technologies, this invention constructs a simulation method integrating neck, lesion, and environmental assessments, simultaneously outputting quantitative data on tumor dose and environmental leakage, achieving an intuitive quantitative assessment of the internal distribution and external impacts of the radiation field during iodine-131 treatment.

The application relates to the field of particle accelerators and nuclear power plant cooling technology, and discloses a cooling device suitable for high-power rays, which comprises an absorber assembly, a cooling water system assembly, a vacuum tube assembly, a shielding body assembly and a supporting assembly. The absorber assembly is welded by brazing process from internal graphite and external copper, the copper is provided with a gas hole penetrating into the graphite layer, the gas hole is connected with an internal air cavity of the graphite, and a vacuum sealed cavity is formed. The cooling water system assembly comprises a water distributor designed with two layers of water inlet ring cavities and two layers of water outlet ring cavities, so that the flow is evenly distributed. The absorber cooling water pipe is embedded in the copper and connected with a U-shaped pipe to form a cooling loop. The electron beam strikes the graphite to generate heat, the heat is transferred to the copper, and the cooling water in the cooling water pipe embedded in the copper carries away the heat. The shielding body assembly is arranged around the vacuum tube assembly to prevent radiation leakage. The cooling device realizes effective heat dissipation of 8 GeV high-power rays, has excellent radiation resistance and a very high fatigue life.

This utility model discloses a foldable protective screen for a CT scan room, mainly composed of a counterweight frame, multiple sets of shielding plates, and hinges. The shielding plates adopt a composite structure of a stainless steel outer layer and a lead layer. Adjacent shielding plates are seamlessly hinged through interlocking parts and openings to eliminate radiation leakage gaps. The bottom of the shielding plates is equipped with casters and a lead curtain combination, balancing ease of movement and bottom protection. A limiting component is configured on the rear shielding plate to achieve fixed position. This design ensures compliance with medical radiation protection standards while solving the technical pain points of traditional protective devices, such as inconvenience in movement and weak protection at joints. It is particularly suitable for medical locations such as CT scan rooms where frequent adjustments to the protective layout are required.

The application belongs to the technical field of surface plasmon excitation and transmission application, and relates to a structure and method for reducing transmission loss based on parallel silver nanowires. The substrate is provided with at least one pair of parallel silver nanowires, the diameter of the silver nanowires is 400-800 nm, the length of the silver nanowires is 10-20 microns, and the parallel spacing or gap of the silver nanowire pair is 5-50 nm; the method comprises the following steps: step 1, preparing large-size silver nanowires; step 2, using a micro-manipulation method to accurately move a single silver nanowire on the substrate prepared in step 1 to construct a parallel silver nanowire structure; and step 3, using a fiber coupling method to excite the parallel silver nanowires to generate SPPs and measure the transmission loss. The application utilizes the influence of mode coupling between two parallel single silver nanowires in the parallel silver nanowire structure on the electric field distribution, suppresses the radiation leakage of energy to the substrate, and significantly reduces the transmission loss of SPPs.