TOMO-XRF probe is a compact, low-power, in-situ X-ray imaging/CT and X-ray Fluorescence (XRF) system in a standard carry-on case. This most compact X-ray Imaging/CT/XRF system in the world is equipped with recently available cutting-edge X-ray components, innovative configuration, and innovative data processing and analysis methods to obtain both internal structure and element distribution of rock/ice samples for NASA’s New Frontiers and Discovery missions.