48results about How to "Reduce radiation levels" patented technology

A non-contact flood and moisture detector for detecting water on remote surface includes a source of IR radiation directed towards the remote surface and projecting a field of illumination on the remote surface, and a receiver of IR radiation directed towards the remote surface, and collecting the IR radiation from a field of view on the remote surface, with the field of illumination and the field of view at least partially overlapping. A portion of the IR radiation is backscattered and received by the receiver and a portion of the IR radiation is specularly reflected and not received by the receiver. An electronic circuit synchronized with the source and the receiver compares the IR radiation measured by the receiver to a dry baseline condition level where a decrease in the backscattered IR radiation measured by the receiver indicates the presence of water.

A slot-line planar antenna has a substrate, an outer conductor disposed on one principal surface of the substrate and having an opening defined therein, an inner conductor disposed on the one principal surface of the substrate and positioned within the opening, the outer conductor and the inner conductor jointly defining a looped aperture line therebetween, and an electronic device electrically interconnecting the outer conductor and the inner conductor for controlling an electromagnetic wave field of a slot line provided by the aperture line.

A radiation shield and method for reducing ambient radiation levels at a distance from a surface irradiated by penetrating radiation emanating from an instrument substantially along a propagation axis. The shield attaches to an end of the instrument proximate to an irradiated surface and has a surface of attenuating material disposed with a component extending outward from the propagation axis of penetrating radiation and substantially adjacent to the irradiated surface.

The invention relates to an energy emission end of a multi protruded type magnetic coupling mechanism applied to wireless power supply of electromobile, belongs to the technical field of wireless energy transmission, and aims at solving the problems that there is no gap among magnetic cores of a present wireless power supply device of the electromobile, structure adjustment is inconvenient, and the using amount of magnetic cores is large. N magnetic poles are arranged successively along the length direction, and the distance between adjacent magnetic poles is q; each magnetic pole comprises at least one protruded magnetic core, two adjacent magnetic poles include at least three protruded magnetic cores, all protruded magnetic cores in one magnetic pole are arranged successively along the length direction, and the distance between adjacent protruded magnetic cores is d; each protruded magnetic core is composed of a long-strip-shaped bottom magnetic core part and a long-strip-shaped vertical magnetic core part, and the protruded magnetic core includes homocentric squares in the downward view; and a power supply cable is wound around all the long-strip-shaped vertical magnetic core part of each magnetic pole sequentially. The energy emission end is applied to wireless power supply of the electromobile.

In optical disc drive, laser diode is used, and also HFM (High Frequency Module) oscillator is used to reduce laser mode hopping noise. Big EMI noise is radiated by the HFM current for optical noise reduction, or by the switching current for write-strategy of recording. Then conventionally, shield was required in order to reduce EMI noise radiated by the current driving a laser diode. By giving a jitter to the HFM signal superimposed to the current of laser diode or switching signal by write-strategy for recording, a spectrum is diffused and the peak value of an EMI noise is reduced.

The invention discloses a system and method for continuously purifying a primary coolant loop of a pressurized water reactor nuclear power unit. The method for continuously purifying the primary coolant loop of the pressurized water reactor nuclear power unit comprises the following steps: using a special desalting bed for major repair to perform purification treatment on the primary coolant loopof the unit during the major repair period of the primary coolant loop of the unit; and during the daily operation period of the primary coolant loop of the unit, using a chemical and volume control system mixed bed to perform purification treatment on the primary coolant loop of the unit. As two desalting beds are adopted to singly perform purification treatment on the primary coolant loop of theunit during the major repair and daily operation periods of the primary coolant loop of the unit, function separation of the desalting beds during the major repair and daily operation periods is realized so that the special bed is dedicated and crossed pollution is effectively prevented; resin in the special desalting bed for major repair is filled for volume reduction and single use; during nextmajor repair, the resin is changed with new resin according to a resin volume reduction standard; without changing the unit design, public major repair desalting bed equipment is independent purification of adjacent units, the crossed pollution of the adjacent units is avoided, extra radioactive solid wastes are not increased, the radiation level of the unit is reduced, and the radiation dosage of maintenance personnel is reduced.

The invention discloses a flexible shielding method for a high-radioactive foundation pit. The method comprises the following steps: (1) manufacturing and processing a mated shielding layer according to the size of a field foundation pit; (2) putting the shielding layer on a to-be-shielded radioactive object in the foundation pit; and (3) filling a shielding material to form an integral shielding layer to shield the radioactive object in the foundation pit. The method successfully solves the problems of high staff radiated dose, long duration, high material cost and the like of a temporary shielding construction in a high-radioactive place, is feasible, reliable in process, safe and efficient, the operation is simple, the cost can be saved and the secondary pollution production can be alleviated, so that the radioactive level of staff in the operation area can reach an acceptable value, and the construction operation in the area can be smoothly completed.

The invention belongs to the technical field of nuclear industry maintenance and particularly relates to a maintenance method of MOX equipment. The maintenance method includes: transferring radioactive objects in a to-be-maintained glove box into an adjacent glove box; sealing the to-be-maintained glove box, and using air circulation and dust collection to lower the radioactive level in the to-be-maintained glove box; performing chemical decontamination on workbench surfaces, wall faces and equipment surfaces in the to-be-maintained glove box; performing dose analysis on the radioactive levelin the to-be-maintained glove box; if the radioactive level in the to-be-maintained glove box meets radioactivity regulations, allowing operation staff to enter the to-be-maintained glove box; if theradioactive level in the to-be-maintained glove box does not meet the radioactivity regulations, continuing the third step until the radioactive level meets the radioactivity regulations; building a gas tent in a preparation area to prevent radioactive contamination from being brought to the outside; allowing the operation staff wearing special protective garments to enter the to-be-maintained glove box to perform maintenance. By the method, the radioactive level can be lowered evidently, the safety of maintenance workers can be guaranteed, radioactive leakage can be avoided, and operation safety under high-radiation work conditions is achieved.

The invention belongs to the field of recovery technology of unqualified products from nuclear fuel preparation process and specifically relates to a recovery method of unqualified powder from the MOXpreparation process. The method comprises the following steps: calculating required unqualified MOX powder, introducing cooling water and mixing; analyzing uranium plutonium content, impurity content, granularity, specific surface area, apparent density and O/M; carrying out chemical dissolution recovery treatment on unqualified powder with elevated level of heavy metal impurities; treating powder with volatile impurity content or unqualified O/M by selecting a corresponding sinter boat according to required treatment quantity and internal space of a calcining furnace and uniformly laying unqualified powder into the sinter boat, introducing Ar-H2 gas mixture into the calcining furnace, regulating H2 content according to O/M, slowly heating, carrying out thermal insulation, and cooling thecalcining furnace to room temperature after thermal insulation; and treating MOX powder with unqualified uranium plutonium content by adding UO2 or PuO2 powder according to the uranium plutonium content analysis result to regulate the uranium plutonium content of the powder. According to the invention, effective utilization of unqualified powder can be realized.

The invention provides a mobile phone and computer anti-radiation eye protection liquid. The eye protection liquid is prepared from the following components in parts by weight: 1 to 2 parts of ofloxacin eye drops, 0.3 to 0.8 part of aloe vera, 0.2 to 0.6 part of Shangnong large leaf aloe, 0.4 to 0.9 part of aloe arborescens; 0.4-1 part of cactus, 0.4 to 0.8 part of hylocereus undatus; 0.2-0.5 partof ball cactus, 0.5-1 part of homalomena occulta, 1-2 parts of palm flowers, and 0.5-1 part of succulent plants. The preparation method of the eye protection liquid comprises the following steps: S1,selecting the plant materials, cleaning, and adding some diluted plant disinfectants to carry out a disinfection treatment. The eye protection liquid has the advantages that the raw materials are abundant, the production process is simple, the application of the eye protection liquid is convenient; the eye protection liquid is uniformly smeared on a mobile phone/computer screen, a protective filmis pasted after the liquid is slightly dried, the radiation of a mobile phone and a computer to eyes can be effectively reduced after the eye protection liquid is used, damage to the eyes is reduced,and the eye protection liquid is worthy of large-scale application and popularization.

The invention discloses an irradiation experimental device for a pulse reactor. A radial duct is formed in the pulse reactor. The radial duct comprises a duct outlet. A neutron trap is arranged inside the radial duct; a shielding body is arranged outside the radial duct; and a passing hole is formed in the shielding body. The irradiation experimental device comprises a movable shielding cover, a shielding storage rack, a double-screw synchronous drive mechanism and an elevator, wherein the shielding storage rack is arranged at a position, which avoids an area of the passing hole, above the shielding body; the shielding storage rack is used for placing shielding irradiation cavities of different specifications; the elevator comprises an elevator car; and when the elevator car is located in the bottom-most layer, an opening of the elevator car is opposite to the duct outlet. According to the irradiation experimental device disclosed by the invention, the double-screw synchronous drive mechanism is used to drive the elevator car to move, so that automatic transfer and storage can be achieved in the shielding storage rack and the duct outlet, thereby achieving replacement and storage of a plurality of sets of experimental devices in a small experimental space, and also ensuring the radiation protection safety of laboratory personnel.

The invention aims to disclose a radiation protection structure for a spent fuel transport ship. The radiation protection structure comprises a cargo compartment area, wherein the cargo compartment area is at least provided with a cargo compartment capable of carrying one or more spent fuel cargo bags; shielding bodies are arranged at a cargo compartment cover, a prow transverse bulkhead, a close-to-stern transverse bulkhead and bulkheads on the two sides of the cargo compartment, and the shielding bodies are formed by combining one or more shielding materials selected from the group consisting of steel, concrete, polyethylene and fresh water in a layered mode. Compared with the prior art, the neutron-gamma ray composite shielding bodies are arranged in key areas of the cargo compartment,so comprehensive shielding of neutrons and gamma rays released by spent fuels is realized, the probability that radioactive particles penetrate out of the cargo compartment is reduced, the irradiationlevel of other areas of a ship outside the cargo compartment is reduced, and therefore, a irradiation dose received by crews in the transportation process of the spent fuels is reduced; and the shielding material is mature and economical, the weight of the shielding bodies is low, comprehensive neutron-gamma ray shielding effect is good, and the purpose of the invention is achieved.

The invention discloses a multi-slot anti-interference motor for an automobile air window cleaning pump, and the motor comprises a rotor assembly which comprises a rotor iron core and a commutator matched with the rotor iron core; the number of grooves of the rotor core and the number of grooves of the commutator are the same even number and are larger than or equal to 10. According to the anti-interference motor of the multi-slot automobile air window cleaning pump, through the arrangement of the rotor iron core with the even number of slots and the commutator, the motor windings are distributed on the circumference of the air gap in a balanced mode, radial magnetic pulling force generated by the motor tends to be balanced, vibration and torque pulsation of the motor are reduced, and therefore the radiation level of the motor is further reduced. The number of the grooves of the commutator and the number of the grooves of the rotor core are increased to 10, so that the inter-sheet voltage between the commutator sheets can be reduced, the grade of sparks generated during commutation is reduced, and the electromagnetic radiation level of the motor is reduced. The invention has the characteristics of simple structure, low cost, benefit for batch production and strong anti-interference capability.

A pulse wave shaper for reducing the radiation emission level is disclosed. The pulse wave shaper, comprises a first integrator, wherein the first integrator receives a first pulse wave and generates a second pulse wave and a second integrator coupled to the first integrator, wherein the second integrator receives the second pulse wave and generates a third pulse wave with a pulse wave amplitude. The first pulse wave comprises a first pulse wave shape, the second pulse wave comprises a second pulse wave shape, and the third pulse wave comprises a third pulse wave shape. The third pulse wave shape, when transmitted over a bus, generates a reduced radiation emission level.