@article{oai:nitech.repo.nii.ac.jp:00004942,
 author = {Sugie, H. and Tanemura, Masaki and Filip, V. and Iwata, K. and Takahashi, K. and Okuyama, F.},
 issue = {17},
 journal = {APPLIED PHYSICS LETTERS},
 month = {Apr},
 note = {Field emitters comprised of aligned carbon nanotubes are shown to be promising as a primary electron source in an x-ray tube working in a nonultrahigh vacuum ambience. At a pressure of 2×10-7Torr, the nanotube emitters continue to emit electrons for more than 1 h, and yield better resolved x-ray images than do thermionic emitters, independently of whether the sample is biological or nonbiological. The near-uniformity in energy distribution of electrons emitted from carbon nanotubes might be related to the improved image quality in the field-emission mode., application/pdf},
 pages = {2578--2580},
 title = {Carbon nanotubes as electron source in an x-ray tube},
 volume = {78},
 year = {2001}
}