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  2. Lead shielding - Wikipedia

    en.wikipedia.org/wiki/Lead_shielding

    Personal shielding includes lead aprons (such as the familiar garment used during dental x-rays), thyroid shields, and lead gloves. There are also a variety of shielding devices available for laboratory equipment, including lead castles , structures composed of lead bricks , and lead pigs , made of solid lead or lead-lined containers for ...

  3. History of radiation protection - Wikipedia

    en.wikipedia.org/wiki/History_of_radiation...

    Protective aprons that do not comply with DIN 6857-1 of 2009 or the new IEC 61331-1 [47] of 2014 may result in higher exposures. There are two classes of lead equivalency classes: 0.25 mm and 0.35 mm. The manufacturer must specify the area weight in kg/m 2 at which the protective effect of a pure lead apron of 0.25 or 0.35 mm Pb is achieved ...

  4. Chip carrier - Wikipedia

    en.wikipedia.org/wiki/Chip_carrier

    RoHS compliant, lead-free and green material sets are now qualified standards. Leaded chip carrier extraction tool. Vacuum picks may also be used instead. A PLCC circuit may either be installed in a PLCC socket or surface-mounted. PLCC sockets may in turn be surface mounted, or use through-hole technology.

  5. Ancient Greek military personal equipment - Wikipedia

    en.wikipedia.org/wiki/Ancient_Greek_military...

    Hoplites mounted on horseback likely used a heavier, curved sword known as the kopis, meaning "chopper" in the Greek language. [2] [9] Light infantry known as peltasts would carry a number of javelins used to pepper enemy formations, avoiding close combat whenever possible. The job of the peltast was not to engage in formation combat, therefore ...

  6. Apron (architecture) - Wikipedia

    en.wikipedia.org/wiki/Apron_(architecture)

    Burford Methodist Church has aprons beneath its five upper windows. An apron is a raised section of ornamental stonework below a window ledge, stone tablet, or monument. [1] Aprons were used by Roman engineers to build Roman bridges. The main function of apron was to surround the feet of the piers. [2]

  7. Ground support equipment - Wikipedia

    en.wikipedia.org/wiki/Ground_support_equipment

    Ground support equipment (GSE) is the support equipment found at an airport, usually on the apron, the servicing area by the terminal. This equipment is used to service the aircraft between flights. As the name suggests, ground support equipment is there to support the operations of aircraft whilst on the ground. The role of this equipment ...

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