X-ray spectrum and dose rate distributions of the miniature X-ray tube. (a) X-ray spectrum of the miniature X-ray tube. The spectrums are normalized by the highest peak signal of 9.7 keV W Lβ1 characteristic X-ray. (b) X-ray dose rate distributions of the miniature X-ray tube measured at 1 cm (blue filled square) and 3 cm (red filled circle) in air.
Heo et al. Nanoscale Research Letters 2012 7:258 doi:10.1186/1556-276X-7-258