Figure 3From: A vacuum-sealed miniature X-ray tube based on carbon nanotube field emittersX-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.Back to article page