67 results about "Radiation leakage" patented technology

The invention provides an intelligent sorting method and system for radioactive substances. The method comprises the following steps: synchronously detecting surface element composition and radiation intensity of a radioactive substance through an X-ray fluorescence spectrometer, and constructing a spatial difference matrix of element abundance distribution and a radiation gradient topological graph; the three-dimensional coordinates, the pressure threshold value and the shape adaptation parameters of the target grabbing position are determined on the basis, the curvature radius of the clamping jaw deformation contour is dynamically adjusted, and the error of the dynamic geometric envelope and the contour template is converged to be within the threshold value; finally, when the clamping jaw reaches a target position, the area of the heat shrinkage material is activated to be heated according to the radiation intensity abrupt change boundary coordinates, a sealed isolation layer synchronously expanded with the dynamic geometric envelope is generated, and safe grabbing and sealed isolation of radioactive substances are achieved. According to the technical scheme, accurate grabbing of radioactive substances, error self-adaptive compensation and synchronous isolation of radiation leakage can be achieved, and the sorting safety and efficiency are improved.

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 discloses an ISM frequency band broadband antenna for near field communication of a metamaterial fabric wireless body area network, which belongs to the field of wireless communication and comprises a dielectric substrate, a coupling structure is etched on the bottom layer of the dielectric substrate, and a first feeder line structure, a second feeder line structure, a third feeder line structure and a fourth feeder line structure are etched on the top layer of the dielectric substrate. A first far-field suppression resistor and a second far-field suppression resistor are respectively arranged at the current antinode positions of the third feeder line section structure and the fourth feeder line section structure; and a first impedance matching resistor and a second impedance matching resistor are respectively arranged at the joint of the first feeder line structure and the third feeder line structure and the joint of the second feeder line structure and the fourth feeder line structure. According to the ISM frequency band broadband antenna for near field communication of the metamaterial fabric wireless body area network, the problem of data security caused by electromagnetic wave far field radiation leakage in a WBAN system constructed by the metamaterial fabric is effectively solved, and the information security of a WBAN application scene is improved.

The invention discloses a radiation-inhibiting needle point structure, a two-dimensional probe and a microwave test system, belongs to a microwave radio frequency test technology, and aims to solve the problems that radiation crosstalk is aggravated and insertion loss is abnormal in a millimeter wave to terahertz frequency band on-chip test, and a traditional three-dimensional probe is limited by process precision and is difficult to meet high-frequency test requirements. The radiation-inhibiting needle point structure comprises a ground wire and a signal wire, the ground wire is located on two sides of the signal wire to form a GSG needle point structure, and a supporting structure is arranged between the ground wire and the signal wire; a cantilever type shielding layer is arranged above the ground wire, and a G needle root hollowed-out structure is arranged at the position, close to the root of the needle tip, of the cantilever type shielding layer; each of the ground wire and the signal wire comprises a GSG needle point structure lower nickel layer and a GSG needle point structure upper copper layer, the needle point part of the ground wire is provided with a transition structure, and the thickness of the transition structure is gradually reduced from the root of the needle point to the tip of the needle point; a signal line is constrained in a quasi-TEM mode for transmission, so that high-frequency radiation leakage is effectively inhibited; and the stress of the needle tip can be optimized by adjusting structural parameters.

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 utility model relates to the technical field of radiation shielding, and particularly relates to a shielding slide rail structure of a transverse moving type radiation protection door and window, which comprises a bottom rail, a door body, and a plurality of rollers fixed to the two sides of the bottom surface of the door body. The bottom rail comprises a rail body and lead plates fixed to the two sides of the rail body, and the rail body has an upwardly protruding fitting strip. The two side walls of the fitting strip and the lead plates form a wheel groove. The lower edge of the door body has a recessed fitting groove in the middle part. The fitting strip partially extends into the fitting groove. The rollers extend into the wheel groove and enable the door body to slide along the length direction of the bottom rail. The utility model forms a multi-stage sealing characteristic of mutual alignment and cooperation between the door body and the bottom rail through the cooperation of the lead plates, the wheel groove, the fitting strip and the fitting groove. The radiation leakage prevention capability of the door gap edge is greatly improved, and the radiation leakage is effectively prevented. The utility model provides more reliable radiation protection for the use place.

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.

1. The name of the design product: house (chest examination safety cabin). 2. The use of the design product: used for isolating external radiation leakage and placing chest examination equipment. 3. The design points of the design product: in shape. 4. The picture or photo that can best show the design points: perspective view.

According to the anti-radiation X-ray mechanism and the dental X-ray machine, radiation leakage of an X-ray assembly is blocked by arranging a light source protection sleeve, and X-rays which are emitted from the emitting end of the X-ray assembly and reach a beam limiting cylinder assembly are prevented from being leaked through a beam limiting cylinder protection sleeve; the inner diameter of the first end of the beam limiting cylinder protecting sleeve is larger than that of the window on the light source protecting sleeve, and the first end of the beam limiting cylinder protecting sleeve surrounds the peripheral side of the window, so that partial areas of the beam limiting cylinder protecting sleeve and the light source protecting sleeve are stacked in an imbricated manner to realize sealing; the X-ray can be blocked by the beam limiting cylinder protecting sleeve even if the X-ray escapes outwards after passing through the window, so that tight connection protection between the light source protecting sleeve and the beam limiting cylinder protecting sleeve is realized, and the X-ray is prevented from leaking from a gap.

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 utility model discloses a jig for high-voltage ignition detection of an X-ray bulb tube. The jig comprises a stainless steel tank and an observation window covering the upper part of the stainless steel tank, a high-voltage wire connecting hole is formed in one end of the stainless steel groove, a high-voltage wire extending pipe extending towards the interior of the stainless steel groove is arranged in the high-voltage wire connecting hole, and the tail end of the high-voltage wire extending pipe is connected with a bulb tube quick plug connector used for being connected with an X-ray bulb tube through a high-voltage wire connector; a lamp wire connecting hole is formed in the other end of the stainless steel groove, and a lamp wire connector is arranged in the lamp wire connecting hole. According to the utility model, the creepage phenomenon and the radiation leakage phenomenon possibly occurring in the traditional measure are avoided, a guarantee can be provided for the fixation of the X-ray bulb tube, and compared with the traditional design that the bulb tube is directly suspended in oil liquid, accidental ignition caused by non-bulb tube faults is not easy to cause, and meanwhile, the fixing method is simple and the bulb tube is convenient to replace; in addition, due to the design of the oil outlet in the bottom, the problem of oil discharge can be solved under the condition of ensuring sealing and radiation protection.

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 application discloses an ISM frequency band broadband antenna for near field communication of a metamaterial fabric wireless body area network, and belongs to the wireless communication field.The ISM frequency band broadband antenna comprises a dielectric substrate, the bottom layer of the dielectric substrate is etched with a coupling structure, the top layer is etched with a first feed line structure, a second feed line structure, a third feed line structure and a fourth feed line structure, the current antinode of the third feed line structure and the fourth feed line structure is respectively provided with a first far field suppression resistor and a second far field suppression resistor, and the junction of the first feed line structure and the third feed line structure and the junction of the second feed line structure and the fourth feed line structure are respectively provided with a first impedance matching resistor and a second impedance matching resistor.The ISM frequency band broadband antenna for near field communication of the metamaterial fabric wireless body area network effectively solves the data security problem caused by electromagnetic wave far field radiation leakage in a WBAN system constructed by the metamaterial fabric, and improves the information security of a WBAN application scene.

The invention provides turnover type irradiation sterilization equipment and method, and relates to the technical field of irradiation sterilization, and the equipment comprises an irradiation box body, a feeding belt conveying part, a discharging belt conveying part, an irradiation mechanism and a turnover driving assembly. The irradiation mechanism is provided with symmetrical rotary supporting frames and a belt bearing assembly and can clamp the protective articles and achieve 180-degree overturning, and the front faces and the back faces of the protective articles are sequentially exposed to the lower portion of the irradiation generation module to be sterilized. The adjusting unit controls opening, closing and spacing of the belt bearing assembly, and stable conveying and clamping are ensured; and the turnover driving assembly synchronously drives the irradiation generation module to lift, so that interference is avoided. During sterilization, the protective articles are fed into the irradiation box body through the conveying belt, turned over after being irradiated for the first time, then irradiated for the second time and finally output through the discharging belt. The closed automatic design is adopted, radiation leakage is avoided, sterilization is thorough, efficiency is high, and the device is suitable for large-scale production of masks, protective clothing and other medical protective articles.

The utility model discloses a protective structure suitable for replacing a moderator at a treatment room end, and aims to solve the problems that in the moderator replacing process, a used target needs to be transferred to a waste target containing position and then replaced with a new target material, vacuum recovery after vacuum breaking needs a long time, and the replacement cost is low. And if the target is decommissioned before reaching the decommissioning state, the target is wasted, and the accommodating cost is increased. The device comprises a reflector, a slowing-down body and a target material are arranged in the reflector, a movable door curtain is installed in the reflector, and the door curtain moves to block the target material and the slowing-down body in the neutron transmission direction. According to the protective structure suitable for replacing the moderator at the treatment room end, the neutron source can be isolated when the moderator is replaced at the treatment room end, and damage to a human body caused by radiation leakage of the neutron source target is avoided.

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.