title: Search for persons.
abstract: X-rays and gamma-rays are used to detect hidden persons in vehicles, containers, and railway wagons. They are produced with accelerators, X-ray tubes, cobalt 60 and caesium 137. Fan beams adjusted to a line of digital detectors produce the image. The resolution is sufficient to recognise a human being. The recognition of persons with transmission images is limited by superimposition; backscatter imaging produces clearer images but of one single layer only. The future will bring new applications of search for persons with X-rays. Crimes and terrorist attacks will induce added demand for security, where search with X-rays and gamma-rays will keep its important role or even increase it.
authors.affiliation: Asklepios Klinik St. Georg, Radiology, Lohmühlenstr. 5 20099 Hamburg, Germany. Hermann.vogel@ak-stgeorg.lbk-hh.de
authors.forename: H
authors.initials: H
authors.lastname: Vogel
mesh_terms: D006801:Humans; D011859:Radiography / Q000295:instrumentation* / Q000379:methods / Q000639:trends*; D012637:Security Measures / Q000639:trends*; D051598:Whole Body Imaging / Q000295:instrumentation* / Q000379:methods / Q000639:trends*