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Triode field emitter with a gated planar carbon-nanoparticle cathode
We fabricated a triode field emitter with a normal gate structure and a planar cathode of carbon nanoparticles (CNPs), which consisted of good quality graphitic sheets encapsulating metal (carbide) co...

Generation of continuous and pulsed diagnostic imaging x-ray radiation using a carbon-nanotube-based field-emission cathode

Appl. Phys. Lett. 81, 355 (2002); doi:10.1063/1.1492305

Issue Date: 8 July 2002

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G. Z. Yue
Department of Physics, University of North Carolina, Chapel Hill, North Carolina 27599

Q. Qiu and Bo Gao
Applied Nanotechnologies, Inc., 308 West Rosemary Street, Chapel Hill, North Carolina 27516

Y. Cheng, J. Zhang, and H. Shimoda
Department of Physics and Astronomy, University of North Carolina, Chapel Hill, North Carolina 27599

S. Chang
Department of Radiation Oncology, School of Medicine, University of North Carolina, Chapel Hill, North Carolina 27599

J. P. Lu and O. Zhou
Department of Physics and Astronomy and Curriculum in Applied and Materials Sciences, University of North Carolina, Chapel Hill, North Carolina 27599
X-ray radiation is widely used in medical and industrial applications. The basic design of the x-ray tube has not changed significantly in the last century. In this paper, we demonstrate that medical diagnostic x-ray radiation can be generated using a carbon nanotube (CNT)-based field-emission cathode. The device can readily produce both continuous and pulsed x-rays with a programmable wave form and repetition rate. A total emission current of 28 mA was obtained from a 0.2 cm2 area CNT cathode. The x-ray intensity is sufficient to image a human extremity at 14 kVp and 180 mAs. Pulsed x-ray with a repetition rate greater than 100 kHz was readily achieved by programming the gate voltage. The CNT-based cold-cathode x-ray technology can potentially lead to portable and miniature x-ray sources for industrial and medical applications. ©2002 American Institute of Physics.
History: Received 12 April 2002; accepted 15 May 2002
Permalink: http://link.aip.org/link/?APPLAB/81/355/1
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KEYWORDS and PACS

Keywords
PACS
  • 87.59.Bh
    Biological and medical physics X-ray imaging X-ray radiography
  • 85.45.-w
    Electronic and magnetic devices; microelectronics Vacuum microelectronics
  • 85.35.Kt
    Electronic and magnetic devices; microelectronics Nanoelectronic devices Nanotube devices
  • YEAR: 2002

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PUBLICATION DATA

ISSN:
0003-6951 (print)   1077-3118 (online)
Publisher:
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REFERENCES (14)
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