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Perimeter security glossary - G

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G

Gabion

Boxes of wire mesh, filled with stones and used to build a variety of structures. Often used for rapid deployment or forward area forces. See A-1 Revetment, B-1 Revetment, Rapid Deployment Force, Revetment.

Gas Detector

A sensor that can detect the presence of specific gases or vapors and initiate an alarm.

Gas Neutralizer

A product used in riot control operations to neutralize the effect of tear gases. It is usually packaged as an aerosol spray and issued to police personnel. See Tear Gas.

Gatehouse

A permanent facility used to control pedestrian and vehicular access. Sometimes referred to as an Entry Control Point (ECP) when used at the entrance to controlled or restricted areas. Gatehouses used at base entrances are sometimes called Traffic Check Houses and cannot be considered related to explosives operations. See Access Control, Checkpoint (CP) or (CHP), Entry Control Point (ECP).

General Alarm

The annunciation of an evacuation or readiness alert throughout a facility.

Geotextile Stabilized Sand Walls

A DDESB approved stand-alone, geotextile stabilized sand wall barricade, at least three feet [0.91 m] thick at its crown which has to have side slopes exceeding 1.5 horizontal to 1 vertical. See Hesco Bastion.

Glare Security-Lighting

Illumination projected from a secure perimeter into the surrounding area making it possible to see potential intruders at a considerable distance while making it difficult to observe activities within the secure perimeter.

Glass Break Sensor

An electronic detector that evaluates the sound frequencies generated by breaking glass. It is also called a glass break detector. Contact-type sensors can be mounted directly on the glass; acoustical detectors listen for sound waves.

Glazing

A material installed in a sash, ventilator, or panes such as glass, plastic, etc., including material such as thin granite installed in a curtain wall.

Golden Hour

A principle that states unstable victims must be stabilized within one hour following injury to reduce the risk of death.

Government Assets

Government assets may include but are not limited to: facility, ground support equipment, airborne vehicle equipment, real property, explosives, and other items owned by the DoD and its components. It also includes property owned by NASA or other government agencies. See Assets, DoD Building, DoD Components, DoD Personnel.

Grapeshot antipersonnel device

A grapeshot antipersonnel device consits of shrapnel placed in the bottom of a cylindrical container. The shrapnel is tamped and held in place by wadding and an explosive is packed behind.

Grapeshot charge

This type of charge consists of a container, suitable projectiles, buffer material, a charge, and a blasting cap.

Gray Market

Trade in nuclear or nuclear-related materials, components or equipment in which the end-use or end-user is often hidden or deliberately misidentified. Often used by countries seeking to obtain items that would be denied by the exporters if the end-use was known to be for a nuclear product.

Grenade

A small missile containing explosives or a chemical agent. See Burning Grenade, Bursting Grenade, Expulsion Grenade, Hand Grenades, Rocket Propelled Grenade.

Grid Wire Sensors

Intrusion detection sensors that use a grid of wires to cover a wall or fence. An alarm is sounded if the wires are cut.

Ground Sensors

Sensors designed and installed to detect specified occurrences at or very near ground level.

Ground Vibration

Ground movement caused by the stress waves emanating from a blast. See Blast Wave, Shock Wave.

Ground Zero

The central point of a nuclear detonation (or other large blast). Refers to the point on the ground below or above a nuclear detonation if the device is triggered in the air or underground.

Guard

Onsite security officer who comprises the response function in a physical protection system.

Guardtower

A raised elevation position that allows troops to obtain a clear line of sight, an unobstructed view, or a partially obstructed view of an area typically contained in a controlled perimeter.

Guerrilla Warfare

The term was invented in to describe the tactics Spain used to resist Napoleon, though the tactic itself has been around much, much longer. Literally, it means "little war." Guerilla warfare features cells and utilizes no front line. The oldest form of asymmetric warfare, guerilla warfare is based on sabotage and ambush with the objective of destabilizing the government through lengthy and low-intensity confrontation.

Gun Pit

A dugout area overlooking a permanent checkpoint. See Checkpoint.

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For more information about Infrastructure Defense Technologies' perimeter security products and applications, please call us at 1-800-621-5617, email us at info@themetalith.com, or fill out our contact form.

The Metalith
A Division of Infrastructure Defense Technologies
3575 Morreim Drive • Belvidere, Illinois 61008
Phone: 1-800-621-5617• Fax: 1-815-323-1317
Email: info@themetalith.com