This paper describes three dimensional tomography of micron scale samp
les using MeV ions. STIM (Scanning Transmission Ion Microscopy) Tomogr
aphy enables density information from the sample to be obtained with 5
0 nm resolution. An associated method, PIXET (Particle Induced X-ray E
mission Tomography) can produce three dimensional elemental maps of th
e sample with resolution of the order of 1 mum.