선택한 단어 수는 입니다.
최소 단어 이상 선택하여야 합니다.
최소 단어 이상 선택하여야 합니다.
선택한 단어 수는 30입니다.
최대 10 단어까지만 선택 가능합니다.
최대 10 단어까지만 선택 가능합니다.
제안 방법
- The CNT emitter was installed inside a focusing electrode, which prevents the divergence of an electron beam generated at the CNT emitter. The geometrical shape of the focusing electrode was optimized by calculating electron trajectories from the CNT emitter to the X-ray target with an EGN2 code (GA and WB Hermannsfeldt, Los Altos, CA, USA) [22]. The X-ray target has a conical-shaped transmission type.
대상 데이터
- An alumina ceramic tube, with an inner diameter of 5 mm, an outer diameter of 7 mm, and a length of 30 mm, was used for high-voltage insulation between the cathode assembly and the X-ray target. The focusing electrode, the ceramic tube, and the X-ray target were tightly assembled in a brazing furnace.
- The miniature X-ray tube has a diode structure, which consists of a CNT emitter as a cathode and an X-ray target as an anode. The CNT emitter was fabricated by attaching single-walled CNTs (model: CNT SP95, Carbon Nano-material Technology Co., Pohang, South Korea) to a 0.8-mm copper wire substrate using metal nanoparticles as a binder [20,21]. The CNT emitter was installed inside a focusing electrode, which prevents the divergence of an electron beam generated at the CNT emitter.
이론/모형
- The collimator also shields unwanted X-rays. The required thickness of the collimator to block unwanted X-rays was determined by calculating the X-ray dose rate using Monte Carlo N-Particle Transport code [18]. The tube voltage is 50 kV and the electron beam current is 200 mA in the calculation.
- The X-ray target has a conical-shaped transmission type. The shape of the target was designed to produce X-rays over large angles with the use of Monte Carlo N-Particle Transport code [23]. The transmission-type target was prepared by coating tungsten, at a thickness of approximately 1.
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