상세정보
학술지
A Vacuum-Sealed Compact X-Ray Tube Based on Focused Carbon Nanotube Field-Emission Electrons
- 발행일
- 201302
- 출처
- Nanotechnology, v.24 no.8, pp.1-8
- ISSN
- 0957-4484
- 출판사
- Institute of Physics (IOP)
- 협약과제
- 13ZE1100, ETRI 창의연구실 사업, 손승원
- 초록
- We report on a fully vacuum-sealed compact x-ray tube based on focused carbon nanotube (CNT) field-emission electrons for various radiography applications. The specially designed two-step brazing process enabled us to accomplish a good vacuum level for the stable and reliable operation of the x-ray tube without any active vacuum pump. Also, the integrated focusing electrodes in the field-emission electron gun focused electron beams from the CNT emitters onto the anode target effectively, giving a small focal spot of around 0.3 mm with a large current of above 50 mA. The active-current control through the cathode electrode of the x-ray tube led a fast digital modulation of x-ray dose with a low voltage of below 5 V. The fabricated compact x-ray tube showed a stable and reliable operation, indicating good maintenance of a vacuum level of below 5 × 10-6 Torr and the possibility of field-emission x-ray tubes in a stand-alone device without an active pumping system. © 2013 IOP Publishing Ltd.
- KSP 제안 키워드
- Brazing process, Carbon nano-tube(CNT), Cathode electrode, Digital Modulation, Electron Beam, Emission electron, Pumping system, Two-Step, Vacuum level, active-current control, electron gun