[2] Wang Q H, Setlur A A, Lauerhaas J M et al.. A nanotube-based field-emission flat panel display. Appl. Phys. Lett., 1998, 72(22): 2912～2914

[3] Jean-Marc Bonard, Mirko Croci, Christian Klinke et al.. Carbon nanotube films as electron field emitters. Carbon, 2002, 40(10): 1715～1728

[4] Sunny Bains. Miniature X-ray source has potential for medical applications. OE Reports, 1999, (190)

[6] Bearden J A. X-ray wavelengths. Review of Modern Physics, 1967, 86～99