Jung S., Kim D., Seol S.K.
Korea Electrotechnology Research Institute, KR
Keywords: electron beam, field emission, X-ray source
A field-emission X-ray source for dental imaging with an anode voltage of 70 kV and an anode current of more than 1 mA was designed and assembled using an anisotropically focused electron beam. With up to 3 kV (5 V/um) applied to a grid, the emitted electrons from a carbon nanotube based cathode were shaped into an elliptical beam by an anisotropic electron lens. The electron beam was accelerated by an 13.5-degree angled stationary anode target and focused to a small spot size, which results in an circular-shaped effective X-ray focal spot with a diameter of less than 400 um. Acknowledgment This study was supported by the research fund from Seoul R&BD program (grant # CR070054).
Journal: TechConnect Briefs
Volume: 1, Nanotechnology 2011: Advanced Materials, CNTs, Particles, Films and Composites
Published: June 13, 2011
Pages: 185 - 187
Industry sector: Advanced Materials & Manufacturing
Topic: Carbon Nano Structures & Devices
ISBN: 978-1-4398-7142-3