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2. Metal detector - Wikipedia

   en.wikipedia.org/wiki/Metal_detector

   The Finnish company Outokumpu adapted mining metal detectors in the 1970s, still housed in a large cylindrical pipe, to make a commercial walk-through security detector. [36] The development of these systems continued in a spin-off company and systems branded as Metor Metal Detectors evolved in the form of the rectangular gantry now standard in ...

3. Airport security - Wikipedia

   en.wikipedia.org/wiki/Airport_security

   A technology released in Israel in early 2008 allows passengers to pass through metal detectors without removing their shoes, a process required as walk-through gate detectors are not reliable in detecting metal in shoes or on the lower body extremities.

4. Radiation portal monitor - Wikipedia

   en.wikipedia.org/wiki/Radiation_Portal_Monitor

   RPMs geared for interception of nuclear threats usually incorporate a neutron detection technology. The vast majority of all neutron detectors deployed in RPMs to date relies on He-3 tubes surrounded by neutron moderators. Since the end of 2009, however, the global He-3 supply crisis [11] has made this technology unavailable. The search for ...

5. Four-quadrant gate - Wikipedia

   en.wikipedia.org/wiki/Four-quadrant_gate

   The exit gates blocking the road leading away from the tracks are equipped with a delay, and begin their descent to their horizontal position several seconds after the entrance gates do, so as to avoid trapping highway vehicles on the crossing. In the United Kingdom, the exit-side barriers do not lower until the entrance-side barriers have lowered.

6. Radio-frequency identification - Wikipedia

   en.wikipedia.org/wiki/Radio-frequency_identification

   In 2011, the cost of passive tags started at US$0.09 each; special tags, meant to be mounted on metal or withstand gamma sterilization, could cost up to US$5. Active tags for tracking containers, medical assets, or monitoring environmental conditions in data centers started at US$50 and could be over US$100 each. [ 39 ]

7. Valve - Wikipedia

   en.wikipedia.org/wiki/Valve

   According to API Standards 600, "Steel Gate Valve-Flanged and Butt-welding Ends, Bolted Bonnets", the trim consists of stem, seating surface in the body, gate seating surface, bushing or a deposited weld for the backseat and stem hole guide, and small internal parts that normally contact the service fluid, excluding the pin that is used to make ...