Journal
NANOTECHNOLOGY
Volume 24, Issue 8, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0957-4484/24/8/085201
Keywords
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Funding
- Ministry of Knowledge Economy, Korea
- Korea Evaluation Institute of Industrial Technology (KEIT) [10037391] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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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 x 10(-6) Torr and the possibility of field-emission x-ray tubes in a stand-alone device without an active pumping system.
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