118 results about "Radiation leakage" patented technology

UV reflectors incorporated in UV LED-based light sources reduce the amount of UV radiation emission into the surroundings and increase the efficiency of such light sources. UV reflectors are made of nanometer-sized particles having a mean particle diameter less than about one-tenth of the wavelength of the UV light emitted by the UV LED, dispersed in a molding or casting material surrounding the LED. Other UV reflectors are series of layers of materials having alternating high and low refractive indices; each layer has a physical thickness of one quarter of the wavelength divided by the refractive index of the material. Nanometer-sized textures formed on a surface of the multilayered reflector further reduce the emission of UV radiation into the surroundings. UV LED-based light sources include such a multilayered reflector disposed on an encapsulating structure of a transparent material around a UV LED, particles of a UV-excitable phosphor dispersed in the transparent material. Alternatively, the transparent material also includes nanometer-sized particles of a UV-radiation scattering material.

The invention discloses a beam-defining clipper, radiation imaging equipment and an X-ray radiation field indicating method. The beam-defining clipper, the radiation imaging equipment and the X-ray radiation field indicating method comprise an X-ray radiation field control device used form controlling a radiation field formed by X-rays on an indicating horizon, an anti-radiation shell component used for preventing the radiation leakage of the X-rays, a visible light source used for generating visible light, and a visible optical filed control device used for a visible optical field formed by the visible light on the indicating horizon. The anti-radiation shell component surrounds the areas passed by the X-rays, and the visible optical field and the radiation field are overlapped on the indicating horizon under the control of control and communication devices. The visible optical field control device and the X-ray radiation field control device respectively and independently control the shapes and the positions of the visible optical field and the X-ray radiation field, the position relation of the visible light source and an X-light source is not required, the position of the visible light source can be unadjustable, and therefore a structure is simplified, and meanwhile filtration evenness and the effect of preventing radiation leakage are improved.

The invention provides a device reducing radiation leakage during a screening machine luggage passing process. The device reducing the radiation leakage during the screening machine luggage passing process comprises a case, a conveying belt and a first shielding curtain arranged at the inlet of the case and the outlet of the case. The inner side or the outer side of the first shielding curtain is connected with a second shielding curtain which connected with the case, the lower end of the second shielding curtain extends downward to the upper surface of the conveying belt, and a sealed space is formed between the first shielding curtain and the second shielding curtain. In a screening machine, the second shielding curtain is added at the inner side or the outer side of the first shielding curtain, and the sealed space is formed between the first shielding curtain and the second shielding curtain, so that when the screening machine is arranged in the occasion with large visitor flow rate and dense crowds, and luggage passes through the screening machine one by one closely, the first shielding curtain or the second shielding curtain is in a completely laying-down state, the leakage amount of the X rays inside the case during the process of luggage passing process is greatly reduced, health of staff around the screening machine (especially operating staff) is ensured, and the device reducing the radiation leakage during the screening machine luggage passing process has a significant meaning.

An optical waveguide device has an optical waveguide substrate and a supporting body for supporting the substrate. The substrate has a main body made of an electro-optic material and having a main face and an opposing face, optical waveguides, and electrodes for applying an electrical signal on the optical waveguides. At least a part of the opposing face of the supporting body opposing the substrate is covered with a conductive layer. It is thus possible to reduce the resonance due to substrate radiation leakage of the microwave signal into the whole of the optical waveguide substrate and supporting body.

The present invention relates to a radiation inspection system discloses a shielding door device for a radiation inspection system, comprising a door body, two guides located on two opposite sides of the door body, a rack, a gear and a motor. The two guides are fixed on an upper surface of a frame and the door body is movably connected to the two guides via bearings. The rack is fixed on a bottom of the door body and meshed with the gear. The gear is coupled with a shaft of the motor fixed on a lower surface of the frame. With the above configuration, the present invention is advantageous in automatic and complete shielding of the radiation inspection system without interference. In addition the shielding door can be controlled intelligently, so that accidental radiation leakage can be prevented.

The present invention discloses a microwave oven leakage detector comprising: a) A support member. b) An antenna formed on said support layer that has a region of resistive coating capable of being heated by microwave radiation due to current flow through said antenna which includes said resistive region. c) A temperature sensitive color indicator layer in thermal contact with said resistive region, characterized in that the antenna layer has i.) Is able to effectively collect the microwave radiation leakage from said microwave oven to result in current flow which in turn causes localized heating in its resistive region and ii.) Sufficient heat generating capacity of the resistive region to affect a change in the temperature sensitive, color change indicator layer.

The invention discloses an X-ray radiation field indicating method, a beam limiting device and medical X-ray photographic equipment. The beam limiting device comprises at least one beam limiting body and a plurality of lasers, wherein the beam limiting body is used for determining a radiation field of an X-ray on a preset projection plane; an indicating area is surrounded by projection (on the preset projection plane) of projecting lines of the plurality of lasers; and the indicating area is overlapped with the radiation field. As the laser has little heat radiation, the temperature inside the beam limiting device is prevented from being excessively risen, thereby being beneficial for ensuring that the internal temperature is kept in a safe range, and the system stability is improved; and meanwhile a completely sealed shell can be conveniently adopted to prevent radiation leakage better.

The invention relates to a double-thermal-shield negative-pressure low-temperature heat exchanger test device, and belongs to the technical field of ultra-low temperature. The device includes a low-temperature cold-box and external equipment. The low-temperature cold box is composed of a box body, liquid nitrogen and liquid helium thermal-shields, a 4.5K liquid helium slot, a 1.8K super-flow helium slot, a tested heat exchanger, a heater and a pneumatic regulating valve. The external equipment is composed of liquid nitrogen and liquid helium Dewars, a helium steel cylinder, a gas cabinet, a manual regulating valve, a heater, a room-temperature decompression pump and a vacuum pump. A vacuum is made by the vacuum pump to reduce heat transfer of gas in the cold box, the double cold screens are arranged to reduce radiation leakage heat, the helium steel cylinder provides liquid supply power for the liquid helium Dewar and can adjust pressure entering the 4.5K liquid helium slot, the gas cabinet can recover helium from evaporation of the 4.5K liquid helium slot, a bypass valve is arranged at an inlet of the tested heat exchanger, high-pressure path flow can be reduced, and working statedeviation running of experiment is realized. The device can carry out experiment in a multi-working-state manner, and has the advantages of a simple structure, reliable operation, controllable variable parameters and the like.

The invention provides a high-voltage LDMOS (Laterally Diffused Metal Oxide Semiconductor) device structure with low radiation electric leakage. The device comprises three different section structures of AB, AC and AD. Compared with a traditional high-voltage LDMOS device structure, an AC section structure is additionally arranged between an AB section and an AD section. A second conduction type source region is deleted from the junction of a cellular region and a non-cellular region (field region) to one side of the cellular region, namely an AC section, and a first conduction type body region extends rightwards to be tangent to the second conduction type source region in an AD section, so a radiation leakage path is cut off, the device leakage phenomenon caused by total dose radiation is avoided, off-state loss of the device is reduced, and total dose radiation resistance of the device is improved.

A radiation source container comprising: a radiation source capsule (1); a radiation source holder (4) having an aperture (B) that emits unidirectionally radiation emitted from a radiation port A of the radiation source capsule, that provides screening such that no leakage of radiation takes place except from this aperture, and that fixes this radiation source capsule (1) in a manner that is difficult to attach or detach; a container (7) that accommodates the radiation source holder (4) and that has an irradiation window (C) that transmits radiation emitted from the aperture; an attenuation plate (3) provided between the radiation port of the radiation source capsule and the irradiation window, that attenuates beforehand the amount of radiation emitted; a shutter (6) provided between the attenuation plate (3) and the irradiation window (C) and that screens the radiation emitted from the irradiation window; and a capsule cover whereby, when the recommended use period in respect of the sealing performance of the radiation source capsule (1) has expired, the attenuating plate (3) is removed and the radiation port of the radiation source capsule (1) is resealed with the same material properties and the same thickness as the attenuating plate (3).

The invention discloses a pull-type mobile CT shelter which is fixedly installed on a trailer chassis of a trailer. The CT shelter adopts a layout shaped like a Chinese character "ri", and the inner part of the shelter is divided into a CT inspection room, an operation room and an equipment room in sequence in the length direction of the shelter. The CT shelter is equipped with a negative pressuresterilization system, so that the pressure in the CT inspection room is lower than the pressure outside the shelter, and indoor viruses and bacteria do not spread to the outdoors. A CT scanning machine and a CT bed use special shock absorption systems, and the shock absorption systems can effectively buffer the impact load in all directions of up and down, front and back, left and right during the driving of a vehicle. The CT inspection room is equipped with two access doors, the two access doors are arranged on the two opposite side walls of the CT inspection room, and the two access doors are arranged staggered and not symmetrically placed, so that the disassembly, installation and movement of CT front and rear decorative covers the are facilitated. The six walls of the CT inspection room adopt a lead protective wall structure, and patient exits and the access doors in the CT inspection room adopt lead protective doors, so that radiation leakage is effectively avoided.

The invention discloses an anti-radiation concrete enclosure system. Multiple vertical components are spliced to form a vertical wall face, and multiple horizontal components are spliced to form a topplate; and the top ends of the vertical components support the horizontal components, and the vertical components and the horizontal components are spliced to form a structure. The contact face between every two adjacent vertical components is arranged to be an arc face, the contact face between every two adjacent vertical components is arranged to be an arc face, by arranging the arc contact faces, the formed joints are arc, all the sections of the arcs are not parallel, rays cannot be transmitted linearly and can fall on concrete entities when passing through the joints, the situation thatleakage occurs from the joints is avoided, and the effective anti-radiation effect is achieved. By adopting a spliced prefabrication structure, the anti-radiation concrete enclosure system can be detached and recycled, the assembly efficiency is improved, and the construction cost is lowered. The invention further provides a construction method of the enclosure system. By means of the method, software is used for analyzing the radiation leakage condition so as to achieve the technical effect above, and the design construction cost is lowered.

The present invention relates to an apparatus for blocking or minimizing radiation leakage by automatically treating molten fuel rods, without power or human effort, when a major accident occurs due to a malfunction of an atomic reactor that leads to melting/damaging of fuel rod containers inside the atomic reactor after the fuel rods, which are used in the atomic reactor, become molten.

A scanning system includes an improved arrangement of shielding curtains to limit radiation leakage while achieving high throughput and limiting system length. The scanning system includes a segmented conveyor, including a faster conveyor through a shielding region to improve increase throughput of scanned articles, and a slower conveyor through a scanning region to ensure acceptable scanning performance. The curtains are arranged based on the changing gap distance between the articles that results from the changing conveyor speeds.

The invention discloses a multi-blade collimator of a ray accelerator treatment head. The multi-blade collimator comprises a tank body which is arranged in a multi-layer manner, wherein openings whichpenetrate through the tank body are formed in the upper surface and the lower surface of each layer of the tank body; all the openings are coaxially formed and are used for enabling rays to penetrate; a plurality of vertical blades are arranged in each layer of the tank body; the blades are divided into two groups, and are respectively arranged on two ends of the tank body; the front ends of every two groups of the blades in the horizontal direction are opposite and are located at the corresponding opening; a driver is independently connected to the rear end in the horizontal direction of each blade; the blades in each group are sequentially arrayed, and the side surfaces of the blades are attached to each other; and a right angle beveling is arranged at the front end edge of the side surface of each blade. Through the adoption of the multi-blade collimator disclosed by the invention, multi-blade collimator can be more effectively attached to the edge of the tumor, so that better radiation field shape adapting effect is realized, radiation field shape adapting resolution is increased, ray radiation leakage is reduced, and radiation field transformation efficiency is improved. Theinvention also discloses tumor radiotherapy equipment comprising the multi-blade collimator of the ray accelerator treatment head.

The invention discloses a multifunctional low-temperature scroll plate pre-cooling heat exchanger. The multifunctional low-temperature scroll plate pre-cooling heat exchanger includes an intermediateslit structure, a threaded hole, a spiral groove, a U-shaped groove, a fixing hole and a temperature measuring and heating threaded hole. The heat exchanger is applied to a pre-cooling unit of a pre-cooling type JT refrigerator for a liquid helium temperature zone and a room temperature zone. The heat exchanger can not only directly replace a cold head of a pre-cooler, but also can be used as a supporting bottom plate of a cold screen. The intermediate slit structure increases the heat exchange area, so that the pre-cooling efficiency is greatly improved. The spiral groove is in interference fit with a high-pressure pipeline to pre-cool high-pressure and high-temperature helium. The surface of the heat exchanger is plated with a micron-level thin gold layer to reduce radiation leakage heatloss. The U-shaped groove facilitates the arrangement of pipelines and wires, and can further be used as heat sink of the wires from the liquid helium temperature zone to the room temperature zone. The multiple functions of the cold head of the pre-cooler, the support of the cold screen, the pre-cooling of high-pressure fluid and the heat sink of the wires are integrated, the structure is compact, the contact thermal resistance between the pre-cooler and the heat exchanger is reduced, the pre-cooling effect of a refrigerator is enhanced, and the pre-cooling efficiency is improved.

The invention relates to the technical field of high-temperature gas cooled reactors, in particular to a high-temperature gas cooled reactor absorption ball falling limiting device and a pebble bed type high-temperature gas cooled reactor. The falling limiting device for the absorption balls of the high-temperature gas cooled reactor comprises at least two mounting assemblies, wherein the axes of the multiple mounting assemblies coincide with one another, and the multiple mounting assemblies are detachably connected; an elastic buffer parts which are mounted between every two adjacent mounting assemblies, and the elastic buffer parts and the mounting assemblies are coaxially arranged; and movable electrodes which are installed on the two installation assemblies located at the two ends, and the faces, provided with the movable electrodes, of the installation assemblies are arranged away from the elastic buffering pieces. Signals for starting feeding and stopping feeding are controlled through the movable switch installed on the installation assembly, wherein the movable switch is embedded in the installation assembly and can better resist high temperature, high pressure and intense radiation. Meanwhile, the service life of the movable switch is far longer than that of a travel switch, so that the problem that the travel switch is inconvenient to replace is solved, and the risk of radiation leakage when the travel switch is replaced is avoided.

The invention discloses a radiation-proof electric door for a hospital radiation room and a mounting method of the door, and relates to the technical field of radiation prevention. The radiation-proofelectric door for the hospital radiation room comprises a mounting shaft, two rotary door bodies and a driving mechanism for driving the mounting shaft to rotate, wherein an accommodating space witha lateral opening is formed between the two rotary door bodies; a surrounding plate is arranged on one side of each the rotary door body; the two rotary door bodies can rotate in the forward directionor the reverse direction; the lateral opening of the accommodating space is opposite to or staggered with the surrounding plate; and the surrounding plate can rotate around the axial direction of a rotary shaft and block one of the rotary door bodies from the side edge of the mounting shaft. The radiation leakage of the radiation-proof electric door for the hospital radiation room is small and has a good radiation-proof effect. The mounting method of the radiation-proof electric door of the hospital radiation room is that the mounting shaft connected with the rotary door bodies is mounted onone vertical edge of a reserved door frame of the radiation room, and the rotary shaft of the surrounding plate is mounted on the other vertical edge. The mounting method is simple and easy to maintain.

A treatment planning method and system for determining a treatment plan used to irradiate a treatment volume using a radiation treatment system that includes a multi-leaf collimator (MLC), is disclosed. The treatment plan includes settings for leaf patterns of individual leaves of the MLC, each leaf pattern including a geometry of the individual leaves and forming an aperture for use in the treatment plan. Areas of radiation leakage are identified in each of the leaf patterns, the areas of radiation leakage including first unshielded areas corresponding to gaps that are located between adjacent leaves and outside of the aperture. At least one leakage metric is calculated based on the areas of radiation leakage. A setting for at least one of the leaf patterns can be adjusted based on the at least one leakage metric.

The invention discloses a protective facility for protecting of safety of life around important facilities or areas such as nuclear power plants, and relates to the field of disaster prevention and control. The protective facility comprises a main body part and an accessory part, wherein the main body part of the protective facility comprises a stand column component, reinforcing ribs, baffle plates, a gear component, power devices, wire twisters, stay cords and bases; the accessory part of the protective facility comprises a fire fighting component, a transportation component and a protectioncomponent. The protective facility provided by the invention is used to solve the problem that 'the existing nuclear power plant is usually not equipped with a protective facility other than the nuclear power plant itself'. The protective facility can rapidly reduce the damage degree of radiation leakage of the nuclear power plants and the like within a few minutes in accidents including a nuclear leak, and protects the safety of the life around the important facilities or areas such as the nuclear power plants. The protective facility is strong in support force and stability as well as convenient and fast in construction, can reduce damage to the protective facility caused by earthquakes, and has little negative impact on lighting, landscape, air circulation and the like.

The invention provides a radiation monitoring system. The system comprises a monitoring terminal and a monitoring center; a detector probe, an analog circuit module, an analog-to-digital conversion module, a digital multichannel analyzer and a microprocessor are arranged in the monitoring terminal, wherein the detector probe is electrically connected with the analog circuit module, the analog circuit module is electrically connected with the digital multichannel analyzer through the analog-to-digital conversion module, the digital multichannel analyzer is electrically connected with the microprocessor, and the monitoring terminal is in communication connection with the monitoring center. The monitoring system provides an effective means for occasions requiring unattended operation, radionuclide analysis and gamma dose rate online monitoring, can provide basic information for command departments to master field information of key areas in real time, evaluate radiation leakage situationdevelopment, qualitatively and quantitatively judge nuclear accident/event evolution stages and the like, and has wide applicability in the field of radiation monitoring.

The invention discloses a medical radiation-proof composite wooden door, which is composed of a door frame (1), door boards (2) fixed to the two sides of the door frame (1) and a packing layer (3) arranged in the middle, wherein a radiation-proof coating (16) is arranged on each door board (2), a radiation leakage prevention device (4) is arranged at the bottom of the door frame (1), and an electromagnetic radiation alarming device (5) is arranged on the door board (2). The medical radiation-proof composite wooden door has the advantages of being capable of improving the radiation-proof performance, simple in manufacturing technology, low in cost, easy to move and capable of enabling the radiation leakage problem to be found in time and reminding personnel to be evacuated.