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The most common type of metal detector is a hand-held metal detector or coil-based detectors using oval-shaped disks with built-in copper coils. The search coil works as sensing probe and must be moved over the ground to detect potential metal targets buried underground.
Although the actual inventor of the hand-held metal detector is disputed, the hand-held metal detector was made in 1925 and was first patented by Dr. Gerhard Fisher in 1931. A metal detector had been invented some forty years earlier (1881) by Alexander Graham Bell for the sole purpose of locating a lead bullet in President James A. Garfield.
Scavenge for gold, coins, and other buried treasure with these metal detectors, including models from Garrett, Fisher, and National Geographic.
Mine detectors: A portable, hand-held or worn device to detect buried IEDs. There are many different models from several different companies currently in use worldwide by U.S. and coalition forces. There are many different models from several different companies currently in use worldwide by U.S. and coalition forces.
Hand of Faith: N/A Australia: 1980 Golden Nugget Las Vegas: Hoxne Hoard: 4th or 5th century United Kingdom: 1992 British Museum: Huxley Hoard: 900 to 910 United Kingdom: 2004 Museum of Liverpool: Leekfrith torcs: 400 to 250 BC United Kingdom: 2016 Potteries Museum & Art Gallery: Leominster hoard: Viking Age United Kingdom: 2015 Herefordshire ...
Survey meters in radiation protection are hand-held ionising radiation measurement instruments used to check such as personnel, equipment and the environment for radioactive contamination and ambient radiation. The hand-held survey meter is probably the most familiar radiation measuring device owing to its wide and visible use.
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The detector material is surrounded by a moderator which reduces the kinetic energy of the neutron (slowing down the neutron). Moderated neutrons are commonly called thermal neutrons, [10] and they provide a high probability of interaction with the target material. The following neutron detectors are among the most common types used today:
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