Unlike X-ray scanners, which are potentially dangerous to people, the source of the signals for a terahertz imager occurs naturally and is totally safe. All objects emit terahertz signals. A dramatic example of terahertz imaging can be seen here provided by QinetiQ which is pioneering the development of compact millimetre wave imaging systems. The image was produced with one of their systems and shows the interesting properties of waves in the 10-100 GHz range emitted from a man with clothes on. QinetiQ is a new science and technology powerhouse formed mainly from DERA, the British Government's elite defence research and development organisation.