6results about How to "Reduce exposure dose" patented technology

The invention relates to the technical field of medical auxiliary instruments, and provides a tumor radiotherapy protection device which comprises a multi-shaft mechanical arm and a rotating frame, a carrying arm is installed at the execution end of the multi-shaft mechanical arm, the rotating frame is rotationally connected to the carrying arm, a hollow rotating shaft is rotationally installed on the rotating frame, a motor is installed on the carrying arm, and the hollow rotating shaft and the rotating frame are both driven by the motor. The radial variable-pressure frame is connected to the rotary frame in a sliding mode, a radial variable-pressure mechanism for driving the radial variable-pressure frame to circularly vibrate in a variable-amplitude mode is arranged on the rotary frame, a massage pressing frame is connected to the radial variable-pressure frame in a sliding mode, a torque driven shaft and a pressing shaft are rotationally connected to the massage pressing frame, a radial transmission gap is formed between the hollow rotary shaft and the torque driven shaft, and the hollow rotary shaft and the torque driven shaft are in transmission connection; a torsion spring is installed between the torque driven shaft and the pressing shaft. According to the invention, the limitation that the existing radiotherapy protection device only has a single ray shielding function is broken through, and the integration of protection, nursing and adjuvant therapy functions is realized.

The invention belongs to the technical field of nuclear facility decommissioning, and particularly discloses an underwater laser cleaning and cutting combined machining device and a using method, cleaning and cutting are achieved through refraction and reflection of cleaning laser by scanning an X / Y-axis galvanometer set and a dichroscope and transmission of cutting laser by the dichroscope, and coaxial focusing is achieved through a common field lens; a gas-liquid coaxial composite nozzle is arranged at the bottom, and center auxiliary airflow and annular high-pressure laminar flow water can be independently regulated and controlled; millisecond-level process switching is matched, and instant cutting is carried out after cleaning is completed at the same underwater station. Aiming at the problems of low efficiency, high safety risk, more secondary pollution, poor cutting quality and the like in the decontamination and disintegration process of the high-level metal part of the nuclear power station, the invention does not generate radioactive waste liquid, effectively avoids secondary pollution, remarkably improves the cutting quality, the operation safety and the system reliability, and is suitable for green and efficient retirement operation in a high-radioactivity environment.

This invention discloses a dual-wavelength accelerated curing photopolymerization 3D printing method and apparatus, relating to the field of additive manufacturing technology. It employs a dual-wavelength responsive photopolymerization ink, which comprises a polymerizable monomer, a photoinitiator sensitive to a first wavelength, a photosensitizer sensitive to a second wavelength, a singlet oxygen quencher, and a solvent. The photosensitizer is excited under second-wavelength light irradiation, converting ambient oxygen into singlet oxygen. The singlet oxygen quencher consumes singlet oxygen to reduce local oxygen concentration. The first and second wavelengths are spectrally orthogonal. This dual-wavelength accelerated curing photopolymerization 3D printing method and apparatus eliminates oxygen inhibition in localized low-oxygen environments, reduces exposure dose, and increases printing speed.

This utility model relates to the technical field of nuclear medicine protective equipment, and in particular to an integrated protective kit for a nuclear medicine radiopharmaceutical injector, which simultaneously achieves effective radiation shielding and prevents contamination caused by exposed needles; it includes a first protective tube and a second protective tube; the first protective tube is sleeved on the outside of the injector's volume tube, and a viewing window is provided on the first protective tube along the length of the injector; the first protective tube also has a first protective cover for closing the viewing window; the second protective tube is sleeved on the outside of the injector needle portion, and the second protective tube is slidably connected to the first protective tube, and a second protective cover is provided at the front end of the second protective tube; the second protective tube also has an opening and closing unit for driving the opening and closing of the second protective cover, and the opening and closing unit is connected to the first protective tube through a transmission mechanism.

The application belongs to the technical field of nuclear power equipment, and particularly relates to a sealing ring replacement device, which comprises a mounting frame, a fixing mechanism, a lifting mechanism, a rotating mechanism, a stop ring dismounting mechanism, a screw dismounting mechanism, a hoisting mechanism and a camera mechanism, the fixing mechanism is connected to the mounting frame and is used for fixed connection with a pump shell of a reactor coolant pump; the lifting mechanism is used for driving the rotating mechanism to lift, the rotating mechanism is used for driving the stop ring dismounting mechanism and the screw dismounting mechanism to rotate, the stop ring dismounting mechanism and the screw dismounting mechanism are respectively used for dismounting a stop ring and a screw; the hoisting mechanism is used for connection with a hoisting hole of the sealing ring; and the camera mechanism is used for acquiring graphic information of the sealing ring, so as to acquire positioning information of the sealing ring; the mechanical and graphic positioning mode is adopted, mechanical dismounting of the sealing ring is realized, and the dismounting efficiency and the dismounting quality of the sealing ring are improved.

The application provides a synchronous hoisting mechanism of a special machine for repairing a sealing weld, which comprises a plurality of clamping modules for being fixed on a scaffold platform, a hoisting frame and a synchronous hoisting module installed on the hoisting frame, the scaffold platform is arranged above a control rod drive mechanism to be repaired, the clamping module comprises a supporting leg fixing seat, the hoisting frame comprises a plurality of supporting legs and a supporting beam, the number of the supporting legs is the same as that of the supporting leg fixing seats, the lower ends of all the supporting legs are connected to all the supporting leg fixing seats one by one, the upper ends of the supporting legs are connected to the end portions of the supporting beam, the synchronous hoisting module comprises a fixing disc installed on the supporting beam, a plurality of groups of fixed pulley sets installed on the fixing disc and a plurality of groups of movable pulley sets connected to all the fixed pulley sets through pull ropes, and a lifting hook for being connected to a lifting opening of the special machine for repairing a sealing weld is installed on each group of the movable pulley sets. The synchronous hoisting mechanism can realize stable hoisting of the special machine.