Figure 4From: A vacuum-sealed miniature X-ray tube based on carbon nanotube field emittersXR images of a small raw fish and copperplate and intensity profiles. (a) XR image of a small raw fish acquired at a 60-kV tube voltage. (b) XR image of a 0.1-mm thick copper plate with a magnification factor of 1.25. (c) Intensity profiles along the vertical and horizontal lines in the XR image of the copper plate.Back to article page